WO2018032453A1 - Filtre - Google Patents

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Publication number
WO2018032453A1
WO2018032453A1 PCT/CN2016/095834 CN2016095834W WO2018032453A1 WO 2018032453 A1 WO2018032453 A1 WO 2018032453A1 CN 2016095834 W CN2016095834 W CN 2016095834W WO 2018032453 A1 WO2018032453 A1 WO 2018032453A1
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WIPO (PCT)
Prior art keywords
filter
capacitor
low
circuit
signal
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PCT/CN2016/095834
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English (en)
Chinese (zh)
Inventor
刘荣江
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2016/095834 priority Critical patent/WO2018032453A1/fr
Priority to CN201680087937.4A priority patent/CN109565098B/zh
Publication of WO2018032453A1 publication Critical patent/WO2018032453A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters

Definitions

  • the present invention relates to the field of electronic communications, and more particularly to a filter.
  • the transmission and reception of signals are implemented by a transmitting device and a receiving device.
  • the receiving device receives the wireless signal through the antenna or before the signal is transmitted from the power amplifier to the antenna, the signal is usually RF filtered to eliminate various interferences and noises outside the communication channel.
  • an RF filter of the corresponding frequency needs to be installed behind the antenna in the receiving device.
  • an RF filter of the corresponding frequency needs to be installed between the power amplifier and the antenna.
  • the difference in the frequency of the communication signal requires that the passband filtering frequency of the RF filter is also different.
  • each wireless communication has its own characteristics, such as carrier frequency, signal to noise ratio, dynamic range, and linearity.
  • a communication device is compatible with different communication standards and can transmit and receive different wireless communication signals.
  • the filter of the transceiver end has not been greatly broken. The main reason is that RF filtering cannot achieve a flexible filtering frequency range while still maintaining good filtering performance.
  • a bandpass filter based on a switched capacitor circuit has been developed in which the capacitance is controlled by a multi-channel phase non-overlapping clock switch. Continuously turning on and off the dynamic switch changes the frequency domain transfer function of the circuit from a low-pass characteristic to a band-pass characteristic.
  • the center frequency of the band-pass is related to the switching frequency of the dynamic switch, and the resonant mode and surface acoustic wave of the existing inductor-capacitor
  • the filter's filter center frequency range is much more flexible and saves area.
  • the out-of-band rejection capability of the filter is poor, and the attenuation of the out-of-band signal is not large enough.
  • the embodiment of the invention provides a filter for improving the performance of the signal in the frequency range outside the passband of the filter under the premise of ensuring the performance of the original switched capacitor filter, and filtering out Conditional output signals, which in turn improve the filtering capabilities of the filter.
  • the filter provided by the embodiment of the present invention mainly connects a suppression module to the existing switched capacitor filter, which may be referred to as an out-of-band suppression module, and the suppression module may further filter the signal in the circuit, mainly For the signal outside the filtering range of the switched capacitor filter, that is, the switched capacitor filter cannot perform the signal of the filter, the filtering module performs filtering, thereby improving the filtering capability. Due to the difference in the connection order of the switched capacitor filter and the suppression module, the technical solution of the present invention has different filter configurations, which can be separately described below.
  • a first aspect of the present invention provides a filter, which may include: a suppression module and a switched capacitor filter; the suppression module is connected to the switched capacitor filter, where the connection manner of the suppression module and the switched capacitor filter may be A different way, as follows:
  • the specific connection mode is that the first end of the suppression module is connected to the input signal, the second end of the suppression module is connected to the output signal, and the first end of the switched capacitor filter is connected to the output signal, and the switched capacitor filter is The second end is connected to the ground; the input signal passes through the suppression module, and the signal in the frequency range outside the passband of the switched capacitor filter can be suppressed, thereby filtering out the target signal; and the target signal is filtered by the switched capacitor filter The output signal is obtained, which can be used for communication by the circuit.
  • a feasible structure of the filter is provided.
  • the suppression module first filters the input signal, suppresses the signal in the frequency range outside the passband of the switched capacitor filter, and filters out the target signal;
  • the switched capacitor filter then filters the target signal to obtain an output signal that is used by the circuit for communication.
  • the structure can improve the suppression ability of the signal in the frequency range outside the passband of the filter under the premise of ensuring the performance of the original switched capacitor filter, and filter out the output signal satisfying the condition, thereby improving the filtering of the filter. ability.
  • the specific connection mode is that the first end of the suppression module is connected to the input signal, and the second end of the suppression module is connected to the output signal, and the first end of the switched capacitor filter is connected to the input signal, and the switched capacitor filter is The second end is connected to the ground; the input signal is first filtered by the switched capacitor filter to obtain a target signal; and the target signal can suppress the signal in the frequency range outside the passband of the switched capacitor filter through the suppression module, thereby The output signal is filtered out and used to communicate with the circuit.
  • another feasible structure of the filter is provided, the switched capacitor filter First, the input signal is filtered to obtain a target signal; and the suppression module filters the target signal to suppress signals in the frequency range outside the passband of the switched capacitor filter, thereby filtering out the output signal, and the output signal is used for The circuit communicates.
  • the structure can improve the suppression ability of the signal in the frequency range outside the passband of the filter under the premise of ensuring the performance of the original switched capacitor filter, and filter out the output signal satisfying the condition, thereby improving the filtering of the filter. ability.
  • the suppression modules provided in the embodiments of the present invention can be mainly divided into two categories, one is composed of high/low-pass circuits, and the other is composed of high/low sideband band-stop circuits. Description:
  • the suppression module includes: at least one of a low-pass circuit and a high-pass circuit;
  • the first target signal having a frequency less than the low pass frequency point is filtered out of the signal whose suppression frequency is greater than the low pass frequency point, and the low pass frequency point is greater than the center frequency point of the filter of the switched capacitor;
  • the high pass circuit is specifically configured to suppress The signal having a frequency less than the high-pass frequency point filters out a second target signal having a frequency greater than the high-pass frequency point, and the high-pass frequency point is smaller than a center frequency point of the filter of the switched capacitor.
  • the low pass frequency point and the high pass frequency point mentioned herein are both fixed values, but this fixed value can be flexibly adjusted according to actual needs in practical applications to further control the filtering capability.
  • the suppression module may include at least one of a low-pass circuit and a high-pass circuit, and the low-pass circuit and the high-pass circuit filter capability, that is, The role played by the low-pass circuit and the high-pass circuit is further explained, making the solution more clear.
  • the suppression module includes: at least one of a low sideband band rejection circuit and a high sideband band resistance circuit.
  • the low sideband bandstop circuit is specifically configured to suppress signals in the first high and low sideband frequency range, and filter out a third target signal having a frequency greater than an upper limit value of the first high and low sideband frequency ranges, the first high and low sidebands
  • the frequency range is the frequency range of the low sideband band-stop circuit, the center frequency of the first high and low sideband frequency range is smaller than the center frequency point of the switched capacitor filter;
  • the high sideband bandstop circuit is specifically for suppressing the second high and low side a signal having a frequency range, filtering a fourth target signal having a frequency lower than a lower limit of the second high and low sideband frequency range, the second high and low sideband frequency range being a frequency range of the high sideband bandstop circuit, Second high and low The center frequency of the sideband frequency range is greater
  • the frequency range of the high and low sideband band-stop circuit mentioned herein can also be flexibly adjusted according to actual needs, thereby further controlling the filtering capability.
  • the suppression module may include at least one of a low sideband band resistance circuit and a high sideband band resistance circuit, and the low sideband band.
  • the feasibility of the suppression module simultaneously including the low-pass circuit and the high-pass circuit is Description: If the suppression module includes the low-pass circuit and the high-pass circuit, the low-pass circuit includes a first inductor, the high-pass circuit includes a second inductor; wherein a first end of the first inductor is coupled to the input signal, The second end of the first inductor is connected to the output signal, and the first end of the second inductor is connected to the input signal or the output signal, and the second end of the second inductor is connected to the ground.
  • the low-pass circuit and the high-pass circuit are provided.
  • the number of the inductors herein is not specifically limited.
  • the effects of the low-pass circuit and the high-pass circuit are realized by different connections of the inductors.
  • the feasibility of the technical solution of the present invention is provided, and the technical solution of the present invention can be specifically illustrated.
  • the suppression module including the low-pass circuit and the high-pass circuit at the same time.
  • the suppression module includes the low-pass circuit and the high-pass circuit
  • the high-pass circuit includes a first capacitor
  • the low-pass circuit includes a second capacitor; wherein the first end of the first capacitor is connected to the input signal The second end of the first capacitor is connected to the output signal, and the first end of the second capacitor is connected to the input signal or the output signal, and the second end of the second capacitor is connected to ground.
  • the suppression module includes a low sideband band rejection circuit and the high sideband A feasible description of the strip resistor circuit: if the suppression module includes the low sideband band stop circuit and the high sideband band stop circuit, the high sideband band stop circuit and the low sideband band stop circuit include a second inductor, a third capacitor, a third inductor, and a third capacitor; the second inductor and the second capacitor are connected in parallel, the third capacitor and the third inductor are connected in series; wherein the first end of the second inductor and the second inductor The first end of the second capacitor is connected to the input signal, and the second end of the second inductor is connected to the second end of the second capacitor; the first end of the third inductor is connected to the input signal or the output signal The second end of the third inductor is connected to the first end of the third capacitor, and the second end of the third capacitor
  • the low sideband bandstop circuit and the high sideband bandstop circuit are provided.
  • the number of capacitors and inductors herein is not specifically limited.
  • the low sideband bandstop circuit and the high sideband bandstop circuit are realized by different connections of the capacitor and the inductor. The feasibility of the technical solution of the present invention is provided, and the technical solution of the present invention can be specifically illustrated.
  • the first end of the third capacitor is connected to the input signal or the output signal
  • the second end of the third capacitor is connected to the first end of the third inductor
  • the second end of the third inductor is connected to the ground.
  • the third capacitor and the third inductor are connected differently, thereby implementing low sideband resistance.
  • the effect of the circuit and the high sideband bandstop circuit is provided for the technical solution of the present invention.
  • any one of the first implementation manner of the first aspect of the embodiment of the present invention to the seventh implementation manner of the first aspect of the embodiment of the present invention is the first embodiment of the present invention.
  • the signal source of the input signal carries an internal resistance
  • the first end of the internal resistance is connected to the signal source
  • the second end of the internal resistance is connected to the first end of the suppression module
  • the suppression module The second end of the connection is connected to the output signal.
  • an input signal of the technical solution of the present invention is described, that is, the input signal carries an internal resistance, and the connection relationship of the internal resistance is also mentioned, so that the whole scheme is more specific.
  • the suppression module can include a low-pass circuit, a high-pass circuit, and a low sideband. At least one of a band-stop circuit and a high-side band-stop circuit, if the suppression module includes one of them, for example, the suppression module includes a high-pass circuit, then it may be called a high-pass suppression module, and the like, This is not to be described, then, there are a variety of options.
  • the structure of the filter can be, if connected from left to right: (1) high-pass suppression module, switched-capacitor filter and low-pass suppression module; (2) low-pass suppression module, switched-capacitor filter and high-pass suppression module; 3) high sideband with resistance suppression module, switched capacitor filter and low sideband band rejection suppression module; (4) low sideband band rejection suppression module, switched capacitor filter and high sideband band rejection suppression module; (5) Qualcomm suppression module, switched capacitor filter and high sideband with resistance suppression module; (6) high sideband with resistance suppression module, switched capacitor filter and high pass suppression module; (7) low pass suppression module, switched capacitor filter and High sideband with rejection suppression module; (8) high sideband with resistance suppression module, switched capacitor filter and low pass suppression module; (9) high pass suppression module, switched capacitor filter and low sideband band rejection module; 10) Low sideband band rejection suppression module, switched capacitor filter and high pass suppression module; (11) low pass suppression module, switched capacitor filter and low sideband band rejection suppression module; (12) low sideband band rejection suppression module , switched capacitor filter and low pass suppression module;
  • the second aspect of the present invention further provides an embodiment of the filtering method, which is specifically used in conjunction with the filter of the first aspect, and is not described herein.
  • the third aspect of the embodiments of the present invention further provides a storage medium, and the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software production port.
  • the computer software product is stored in a storage medium for storing computer software instructions for use in the electronic device, including programs for performing the first and second aspects described above.
  • the computer software product is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .
  • an out-of-band rejection filter including: a suppression module and a switched capacitor filter; a first end of the suppression module is connected to an input signal, and a second end of the suppression module is connected to an output signal, and the switching capacitor is The first end of the filter is connected to the output signal, and the second end of the switched capacitor filter is connected to the ground; the input signal is passed through the suppression module to suppress the signal in the frequency range outside the passband of the switched capacitor filter No., filtering out the target signal; the target signal is filtered by the switched capacitor filter to obtain an output signal, and the output signal is used for circuit communication.
  • the structure can improve the suppression ability of the signal in the frequency range outside the passband of the filter under the premise of ensuring the performance of the original switched capacitor filter, and filter out the output signal satisfying the condition, thereby improving the filtering of the filter. ability.
  • FIG. 1(a) is a schematic diagram of an embodiment of a switched capacitor filter according to an embodiment of the present invention
  • FIG. 1(b) is a schematic diagram of a switch control signal in a switched capacitor filter according to an embodiment of the present invention
  • 1(c) is a schematic diagram showing a frequency domain transfer function of a switched capacitor filter circuit according to an embodiment of the present invention
  • 1(d) is a schematic diagram showing the on-resistance of a switched capacitor filter according to an embodiment of the present invention
  • 1(e) is a schematic diagram showing the relationship between the on-resistance of a switched capacitor filter and a frequency domain transfer function in an embodiment of the present invention
  • FIG. 2(a) is a schematic diagram of an embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 2(b) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 2(c) is a schematic diagram of a switch control signal in a switched capacitor filter according to an embodiment of the present invention
  • 3(a) is a schematic diagram of an embodiment of a high-pass and low-pass based suppression module according to an embodiment of the present invention
  • 3(b) is a schematic diagram showing the suppression principle of the high-pass circuit and the low-pass circuit provided in the embodiment of the present invention
  • FIG. 3(c) is a schematic diagram of an embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 3(d) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 3(e) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 3(f) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • 3(g) is a schematic diagram of an embodiment of a low pass suppression module of different low pass frequencies provided in an embodiment of the present invention
  • FIG. 3(h) is a schematic diagram of an embodiment of a high-pass suppression module of different high-pass frequencies provided in an embodiment of the present invention
  • FIG. 4(a) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 4(b) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 4(c) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 4(d) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 4(e) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 4(f) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 5(a) is a schematic diagram of an embodiment of a suppression module based on a high sideband band stop and a low sideband band stop according to an embodiment of the present invention
  • FIG. 5(b) is a schematic diagram showing the suppression principle of the high sideband band stop and the low sideband band stop provided in the embodiment of the present invention.
  • FIG. 5(c) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 5(d) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 5(e) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 5(f) is a schematic diagram of another embodiment of a suppression module provided in an embodiment of the present invention.
  • FIG. 5(g) is a schematic diagram of an embodiment of a low sideband band rejection suppression module with different center frequency points according to an embodiment of the present invention
  • FIG. 5(h) is a schematic diagram of an embodiment of a high sideband band rejection suppression module with different center frequency points according to an embodiment of the present invention
  • FIG. 6(a) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 6(b) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 6(c) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 6(d) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 6(e) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 6(f) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(a) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(b) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(c) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(d) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(e) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(f) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(g) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • FIG. 7(h) is a schematic diagram of another embodiment of a filter provided in an embodiment of the present invention.
  • the filter is usually based on a filter structure of a switched capacitor, as shown in FIG. 1(a), which is a schematic structural diagram of a switched capacitor filter. It mainly includes switches CLK1-1, CLK1-2, ... CLK1-N, where the switch is represented by the abbreviation CLK of the switch signal clock; the capacitors C1-1, C1-2, ..., C1-N, where N is an integer greater than zero. N switches and N capacitors are connected to form N parallel structures. Specifically, the first end of the switch CLK1-1, the first end of the switch CLK1-2, and so on, until the first end of the switch CLK1-N is connected together and connected to the output signal S1(OUT).
  • switches CLK1-1, CLK1-2, ... CLK1-N where the switch is represented by the abbreviation CLK of the switch signal clock
  • the capacitors C1-1, C1-2, ..., C1-N where N is an integer greater than zero.
  • N switches and N capacitors are connected to form N
  • the second end of the switch CLK1-1 is connected to the first end of the capacitor C1-1; the second end of the switch CLK1-2 is connected to the first end of the capacitor C1-2; and so on, until the second end of the switch CLK1-N and the capacitor C1- N is connected at the first end.
  • the second end of the capacitor C1-1, the second end of the capacitor C1-2, and so on, until the second ends of the capacitors C1-N are connected together, and the common terminal is connected to the ground GND.
  • S1 (IN) is the signal source of the circuit
  • Rs1 is the internal resistance of the signal source.
  • S1(IN) is the output signal of the pre-stage circuit
  • Rs1 is the output internal resistance of the pre-stage circuit.
  • Figure 1(b) shows the control signals for each switch in the circuit configuration of the polyphase switching filter.
  • the control signal of the switch in the circuit structure is N clocks that do not overlap each other. In any one clock cycle Ts, each switch is effectively closed only once, and the effective closing time is one-N of the period Ts. Since each clock does not overlap, only one switch is in an active closed state at any one time.
  • Figure 1(c) shows the frequency domain transfer function
  • the value of N is inversely proportional to the 3dB bandwidth of
  • the circuit shown in Fig. 1(a) is an ideal result, and various non-ideal factors exist in practical applications.
  • the on-resistance of the switch is one of several serious non-ideal factors, such as the on-resistances Rsw1-1, Rsw1-2, ..., Rsw1-N shown in Fig. 1(d).
  • the transfer function outside the bandpass frequency range of the filter is no longer zero, but is related to the on-resistance of the switch, as shown in Figure 1(e), which is the on-resistance and filter center of the switch.
  • a schematic diagram of a filter structure provided by an embodiment of the present invention which may also be referred to as a filter structure of an out-of-band rejection, includes a suppression module 2-1 and a switched capacitor filter 2-2. .
  • the suppression module 2-1 is connected to the switched capacitor filter 2-2. Specifically, the first end of the suppression module is connected to the input signal, and the second end of the suppression module is connected to the output signal, and the first end of the switched capacitor filter is connected to the output signal.
  • the second end of the switched capacitor filter is connected to the ground; the input signal passes through the suppression module to suppress the signal in the frequency range outside the passband of the switched capacitor filter, and the target signal is filtered; the target signal is filtered by the switched capacitor filter to obtain an output. Signal, output signal is used for circuit communication.
  • S2(IN) is the signal source of the circuit and Rs2 is the internal resistance of the signal source.
  • S2(IN) is the output signal of the pre-stage circuit
  • Rs2 is the output internal resistance of the pre-stage circuit.
  • the first end of Rs2 is connected to the signal source S2 (IN)
  • the second end of Rs2 is connected to the first end S2 (IN) of the out-of-band suppression module 2-1.
  • the second end of the out-of-band suppression module 2-1 is connected to an output signal S2(OUT), wherein IN2 is an input signal of the signal source S2(IN) passing through the internal resistance Rs2.
  • the switched capacitor filter 2-2 can also be used to control the frequency and bandwidth of the filtering center.
  • the schematic diagram of the filter structure of the outband suppression includes but is not limited to the above shown in FIG. 2(a), as shown in FIG. 2(b).
  • a schematic diagram of another out-of-band rejection filter structure provided by an embodiment of the present invention includes a suppression module 2-1 and a switched capacitor filter 2-2.
  • the suppression module 2-1 is connected to the switched capacitor filter 2-2. Specifically, the first end of the suppression module is connected to the input signal, the second end of the suppression module is connected to the output signal, and the first end of the switched capacitor filter is connected to the input signal.
  • the second end of the switched capacitor filter is connected to the ground; the input signal is filtered by the switched capacitor filter to obtain a target signal; the target signal is passed through the suppression module to suppress signals in the frequency range outside the passband of the switched capacitor filter, and the output is filtered out. Signal, output signal is used for circuit communication.
  • FIG. 2(b) only the positions of the suppression module 2-1 and the switched capacitor filter 2-2 are exchanged. For details, please refer to FIG. 2(b), and details are not described herein again.
  • the circuit structure of the specific switched capacitor filter 2-2 may include: N identical switches, CLK2-1, CLK2-2, ..., CLK2-N; N identical capacitors, C2-1, C2-2, ..., C2 -N; N is an integer greater than zero, usually 2 n , n is a positive integer, and the preferred N is usually 4, 8, 16...; it should be understood that the value of N can also be a power of 2 Other integers greater than zero, but in practical applications, even values are more convenient to calculate.
  • N identical switches CLK2-1, CLK2-2, ..., CLK2-N
  • N identical capacitors C2-1, C2-2, ..., C2 -N
  • N is an integer greater than zero, usually 2 n
  • n is a positive integer
  • the preferred N is usually 4, 8, 16...
  • the value of N can also be a power of 2
  • FIG. 1(a) For the connection relationship between the N identical switches and the N identical capacitors in the switched capacitor filter 2-2, reference may be made to the above-mentione
  • the switching signals (i.e., clock control signals) of the switches CLK2-1, CLK2-2, ..., CLK2-N are as shown in Fig. 2(c), which is substantially the same as that shown in Fig. 1(b) above.
  • the control signal of the switch is N clocks that do not overlap each other. Specifically, in any one clock cycle Ts, each switch is effectively closed only once, and the effective closing time is one-N of the period Ts. Since each clock does not overlap, only one switch is in an active closed state at any one time.
  • the suppression module 2-1 will be specifically described below, usually in two forms, one based on a high pass and/or low pass suppression module; the other based on a high sideband band stop and/or a low sideband band Resistance suppression module.
  • At least one of a high-pass circuit and a low-pass circuit may be included;
  • the low-pass circuit is specifically configured to suppress a signal whose frequency is greater than a low-pass frequency point, filter out a first target signal whose frequency is lower than a low-pass frequency point, and a low-pass frequency point is greater than a center frequency point of the filter of the switched capacitor;
  • the Qualcomm circuit is specifically configured to suppress a signal whose frequency is lower than a high-pass frequency point, and filter a second target signal whose frequency is greater than a high-pass frequency point, and the high-pass frequency point is smaller than a center frequency point of the filter of the switched capacitor.
  • FIG. 3(a) it is a schematic diagram of one embodiment of a high-pass and low-pass based suppression module.
  • the sign "+" in Fig. 3(a) means the relationship of the sum, that is to say, the suppression module has the effects of the high-pass circuit and the low-pass circuit, and the first high-pass circuit is low.
  • the circuit or the high-low-pass circuit is performed at the same time, depending on the design of the circuit.
  • FIG. 3(b) it is a schematic diagram of the suppression principle of the high-pass circuit and the low-pass circuit.
  • the suppression module 2-1 will be described below in a specific implementation manner:
  • the suppression module includes a low sideband bandstop circuit and a high sideband bandstop circuit
  • the low pass circuit includes a first inductor
  • the high pass circuit includes a second inductor; wherein the first end of the first inductor is connected to the input signal, The second end of the first inductor is connected to the output signal, the first end of the second inductor is connected to the input signal or the output signal, and the second end of the second inductor is connected to the ground.
  • 3(c) and 3(d) are schematic diagrams of two embodiments of a suppression module according to an embodiment of the present invention.
  • the first end of the inductor L2-1-1 is connected to the input signal IN2, and the second end of the inductor L2-1-1 is connected to the output signal S2 (OUT), the inductor L2-1-2 The first end is connected to the output signal S2 (OUT), and the second end of the inductor L2-1-2 is connected to the ground GND.
  • the first end of the inductor L2-1-1 is connected to the input signal IN2, and the second end of the inductor L2-1-1 is connected to the output signal S2 (OUT), and the first of the inductor L2-1-2
  • the terminal is connected to the input signal IN2, and the second end of the inductor L2-1-2 is connected to the ground GND.
  • Fig. 3(c) and Fig. 3(d) are symmetrical L-shaped structures, and the series inductance L2-1-1 in Fig. 3(c) and Fig. 3(d) is a low-pass effect, and the suppression frequency is greater than the low-pass point.
  • the signal filters out the first target signal whose frequency is lower than the low pass frequency point, that is, correspondingly suppresses the high sideband signal of the switched capacitor filter 2-2; the parallel inductor L2-1-2 is a high pass effect, and the suppression frequency is lower than the high pass
  • the signal of the frequency point filters out the second target signal whose frequency is greater than the high-pass frequency point, that is, correspondingly suppresses the low sideband signal of the switched capacitor filter 2-2.
  • the suppression module includes a low sideband bandstop circuit and a high sideband bandstop circuit
  • the high pass circuit package The first capacitor, the low-pass circuit includes a second capacitor; wherein the first end of the first capacitor is connected to the input signal, the second end of the first capacitor is connected to the output signal, and the first end of the second capacitor is connected to the input signal or the output signal The second end of the second capacitor is connected to the ground.
  • 3(e) and 3(f) are schematic diagrams showing two embodiments of a suppression module according to an embodiment of the present invention.
  • the first end of the capacitor C2-1-1 is connected to the input signal IN2, and the second end of the capacitor C2-1-1 is connected to the output signal S2 (OUT), and the capacitor C2-1-2 The first end is connected to the output signal S2 (OUT), and the second end of the capacitor C2-1-2 is connected to the ground GND.
  • the first end of the capacitor C2-1-1 is connected to the input signal IN2, and the second end of the capacitor C2-1-1 is connected to the output signal S2 (OUT), and the first of the capacitor C2-1-2
  • the terminal is connected to the input signal IN2, and the second end of the capacitor C2-1-2 is connected to the ground GND.
  • Fig. 3(e) and Fig. 3(f) are also symmetrical L-shaped structures, and the series capacitor C2-1-1 in Fig. 3(e) and Fig. 3(f) is a high-pass effect, and the signal whose suppression frequency is lower than the high-pass frequency point is suppressed.
  • the parallel capacitor C2-1-2 is a low-pass effect, and the suppression frequency is greater than the low-pass frequency
  • the signal of the point filters out the first target signal whose frequency is lower than the low pass frequency point, that is, the high sideband signal of the switched capacitor filter 2-2 is correspondingly suppressed.
  • the 3dB bandwidth frequency of the inductor L2-1-1, the 3dB bandwidth frequency of the inductor L2-1-2, the 3dB bandwidth frequency of the capacitor C2-1-1, and the 3dB bandwidth of the capacitor C2-1-2 The frequency points are not within the 3dB bandwidth frequency range of the switched capacitor filter 2-2.
  • the high-pass frequency point and the low-pass frequency point mentioned above are a fixed value, in practical applications, the values of the high-pass frequency point and the low-pass frequency point can be flexibly adjusted according to actual needs, then further The suppression capability of the suppression module is also adjusted accordingly.
  • FIG. 3(g) a schematic diagram of the first target signal obtained after the input signal passes through the low-pass suppression module of different low-pass frequencies; as shown in FIG. 3(h), the input signal passes through different high-pass frequencies.
  • the embodiment of the present invention can also provide the following schematic diagrams of the filter structure of the out-of-band rejection, as shown in FIG. 4(a) and FIG. 4(b). ), 4(c), 4(d), 4(e) and 4(f), wherein the suppression module including the low-pass circuit may be simply referred to as a low-pass suppression module, and the suppression module including the high-pass circuit may be simply referred to as a high-pass suppression module.
  • a suppression module based on high sideband band rejection and/or low sideband band rejection correspondingly, at least one of a high sideband band stop circuit and a low sideband band stop circuit may be included;
  • the low sideband band rejection circuit is specifically configured to suppress signals in the first high and low sideband frequency ranges, and filter out a third target signal having a frequency greater than an upper limit of the first high and low sideband frequency ranges, and the first high and low sideband frequency ranges are The frequency range of the low sideband band-stop circuit, the center frequency of the first high and low sideband frequency range is smaller than the center frequency of the switched capacitor filter;
  • the high sideband blocking circuit is specifically configured to suppress signals in the second high and low sideband frequency range, and filter out a fourth target signal whose frequency is lower than a lower limit value of the second high and low sideband frequency ranges, and the second high and low sideband frequency ranges are The frequency range of the high sideband resistor circuit, the center frequency of the second high and low sideband frequency range is greater than the center frequency of the filter of the switched capacitor.
  • FIG. 5(a) it is a schematic diagram of an embodiment of a suppression module based on a high sideband band stop and a low sideband band stop.
  • the sign "+" in Fig. 5(a) means the relationship of the sum, that is to say, the suppression module has the effects of the high sideband bandstop circuit and the low sideband bandstop circuit.
  • Fig. 5(b) it is a schematic diagram of the suppression principle of the high sideband band resistance and the low sideband band resistance.
  • the suppression module 2-1 will be described below in a specific implementation manner:
  • the suppression module includes a low sideband bandstop circuit and a high sideband bandstop circuit
  • the high sideband bandstop circuit and the low sideband bandstop circuit include a second inductor, a second capacitor, a third inductor, and a a three capacitor; the second inductor and the second capacitor are connected in parallel, and the third capacitor and the third inductor are connected in series;
  • the first end of the second inductor and the first end of the second capacitor are connected to the input signal, and the second end of the second inductor and the second end of the second capacitor are connected to the output signal; the first end of the third inductor is connected to the input signal Or outputting a signal, the second end of the third inductor is connected to the first end of the third capacitor, and the second end of the third capacitor is connected to the ground.
  • 5(c) and 5(d) are schematic diagrams of two embodiments of a suppression module according to an embodiment of the present invention.
  • the first end of the inductor L2-1-3 is connected to the input signal IN2, and the inductor
  • the second end of L2-1-1 is connected to the output signal S2 (OUT)
  • the first end of the capacitor C2-1-3 is connected to the input signal IN2
  • the second end of the capacitor C2-1-3 is connected to the output signal S2 (OUT)
  • the first end of the inductor L2-1-4 is connected to the output signal S2(OUT)
  • the second end of the inductor L4-1-4 is connected to the first end of the capacitor C2-1-4
  • the second end of the capacitor C2-1-4 Connect to ground GND.
  • the first end of the inductor L2-1-3 is connected to the input signal IN2, the second end of the inductor L2-1-1 is connected to the output signal S2(OUT), and the first end of the capacitor C2-1-3
  • the input signal IN2 is connected
  • the second end of the capacitor C2-1-3 is connected to the output signal S2 (OUT)
  • the first end of the inductor L2-1-4 is connected to the input signal IN2
  • the second end of the inductor L2-1-4 is connected to the capacitor At the first end of C2-1-4, the second end of the capacitor C2-1-4 is connected to the ground GND.
  • Figure 5(c) and Figure 5(d) are symmetrical L-shaped structures.
  • the overall effect of the inductor L2-1-3 capacitor C2-1-3 in Figure 5(c) and Figure 5(d) is the high and low sidebands.
  • the band-stop effect, the center frequency of the band-stop is the self-resonant frequency f0 of the inductor L2-1-3 and the capacitor C2-1-3.
  • the overall effect of the inductor L2-1-4 and the capacitor C2-1-4 is the high and low sideband band-stop effect.
  • the band-stop center frequency is the self-resonant frequency f1 of the inductor L2-1-4 and the capacitor C2-1-4.
  • the self-resonant frequency f0 of the inductor L2-1-3 and the capacitor C2-1-3 is different from the self-resonant frequency f1 of the inductor L2-1-4 and the capacitor C2-1-4, and the magnitudes of f0 and f1 are: one is lower than
  • the bandpass frequency of the switched capacitor filter 2-2 may also be referred to as the center frequency of the switched capacitor filter 2-2, and the other is higher than the bandpass frequency of the switched capacitor filter 2-2, which may also be referred to as a switched capacitor.
  • the center frequency of filter 2-2 It should be ensured that the frequency at the edge of the 3dB bandwidth of the inductor L2-1-3 and the capacitor C2-1-3 and the band edge of the inductor L2-1-4 and the capacitor C2-1-4 are not.
  • the switched capacitor filter 2-2 has a 3dB bandwidth frequency range.
  • the suppression module includes the low sideband bandstop circuit and the high sideband bandstop circuit
  • the high sideband bandstop circuit and the low sideband bandstop circuit include a second inductor and a second capacitor a third inductor and a third capacitor; the second inductor and the second capacitor are connected in parallel, and the third capacitor and the third inductor are connected in series;
  • the first end of the second inductor and the first end of the second capacitor are connected to the input signal, and the second end of the second inductor and the second end of the second capacitor are connected to the output signal; the first end of the third capacitor is connected The input signal or the output signal, the second end of the third capacitor is connected to the first end of the third inductor, and the second end of the third inductor is connected to ground.
  • 5(e) and 5(f) are schematic diagrams showing two embodiments of a suppression module according to an embodiment of the present invention.
  • Figure 5(e) is compared with Figure 5(c) except that the positions of the capacitors C2-1-4 and the inductors L4-1-4 are interchanged.
  • Figure 5(f) is compared with Figure 5(d). Just swap the positions of the capacitors C2-1-4 and the inductors L4-1-4. The rest of the contents are the same, and will not be described here.
  • the center frequency of the low sideband band-stop circuit is f c1 , f c2 or f c3 , if the first high and low sideband frequency range is [f c1 L, f C1 H], f c1 belongs to [f c1 L, f c1 H], and the low sideband band rejection circuit suppresses the signal whose frequency is less than f c1 H, and filters out the third target signal whose frequency is greater than f c1 H, if the low sideband
  • the center frequency of the band-stop circuit is f c2 or f c3 , which is the same principle, and will not be described here; as shown in Figure 5(h), the center frequency of the high sideband band-stop circuit is f c4 , f c5 Or f c6 , if the second high and low sideband frequency range is [f c4 L, f c4 H], f c4 belongs
  • first high and low sideband frequency ranges and the upper and lower limits of the second high and low sideband frequency ranges may be adjusted according to actual needs, then corresponding, the center frequency of the high and low sideband frequency ranges It will also be adjusted accordingly.
  • the embodiment of the present invention can also provide the following schematic diagrams of the filter structure of the outband suppression, as shown in FIG. 6 ( a), FIG. 6(b), 6(c), FIG. 6(d), 6(e) and FIG. 6(f), wherein the suppression module including the low sideband band-stop circuit may be simply referred to as a low side
  • the band rejection suppression module, the suppression module including the high sideband band rejection circuit can be referred to as a high sideband band rejection suppression module.
  • the implementation manners of the suppression module 2-2 shown in FIG. 3 and the suppression module 2-2 shown in FIG. 5 include, but are not limited to, the description provided above, There are many structures for achieving high-pass, low-pass, low-sideband resistance and high-sideband rejection, so any possible frequency transfer function is equivalent to Figure 3(b), 3(g), 3(h), 5
  • the structures of (b), 5(g) and 5(h), and combinations thereof, are all within the scope of protection of the suppression module provided in the technical solution of the present invention.
  • Figure 7 (a) to 7(h) are schematic diagrams showing an embodiment of a filter for combining out-of-band rejection of a high-low-pass circuit and a high-low-side band-stop circuit according to an embodiment of the present invention. It will be apparent to those skilled in the art that various modifications of the embodiments may be practiced in other embodiments without departing from the spirit or scope of the invention. All are within the scope of protection of the present invention.
  • CMOS Complementary Metal Oxide Semiconductor
  • NMOS N-Channel Metal Oxide Semiconductors MOS
  • PMOS P-channel MOS
  • BJT Bipolar Junction Transistor
  • BiCMOS Bipolar CMOS
  • SiGe Silicon germanium
  • GaAs Gallium Arsenide
  • the suppression module in the embodiment of the present invention has been described above.
  • the present invention further provides an embodiment of the filtering method, which is specifically used in conjunction with the foregoing filter, and is not described herein.
  • the embodiment of the invention further provides a computer storage medium for storing computer software used for the suppression module described in the above FIG. 3(c) - FIG. 3(f) or FIG. 5(c) - FIG. 5(f).
  • the instruction by executing the stored program, can filter the passed signal, thereby improving the suppression capability of the suppression module on the switched capacitor filter.
  • the program is implemented in the form of a software functional unit and sold or used as a standalone product, it can be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium.
  • a number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

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  • Filters And Equalizers (AREA)

Abstract

Un mode de réalisation de la présente invention concerne un filtre permettant d'améliorer la capacité de suppression de signaux dans des plages de fréquences des deux côtés à l'extérieur d'une bande passante d'un filtre, de manière à fournir un signal de sortie filtré qui satisfait à des conditions et améliore les capacités de filtre. Le filtre comprend un module de suppression et un filtre de condensateur de commutation. Le module de suppression présente une première extrémité destinée à un signal d'entrée et une seconde extrémité destinée à un signal de sortie. Le filtre de condensateur de commutation présente une première extrémité destinée au signal de sortie, et une seconde extrémité connectée à la masse. Le signal d'entrée passe à travers le module de suppression, qui supprime des signaux dans des plages de fréquences des deux côtés à l'extérieur d'une bande passante du filtre de condensateur de commutation afin de fournir un signal cible filtré. Le signal cible passe à travers le filtre de condensateur de commutation et est filtré par ce dernier afin d'obtenir le signal de sortie. Le signal de sortie est utilisé pour un circuit permettant d'effectuer une communication.
PCT/CN2016/095834 2016-08-18 2016-08-18 Filtre WO2018032453A1 (fr)

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CN112217212A (zh) * 2020-10-21 2021-01-12 国网青海省电力公司电力科学研究院 一种用于抑制非特征谐波谐振的高通阻尼滤波器及方法
CN112491367A (zh) * 2020-12-10 2021-03-12 富满微电子集团股份有限公司 低噪声放大电路、其控制方法与电子设备
CN112994685A (zh) * 2019-12-12 2021-06-18 上海交通大学 数字相位转换器提高输出线性度的方法
CN114070221A (zh) * 2021-11-17 2022-02-18 安徽安努奇科技有限公司 一种滤波器电路及电子设备

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CN114469019B (zh) * 2022-04-14 2022-06-21 剑博微电子(深圳)有限公司 脉搏波信号的滤波方法、装置和计算机设备
CN116260417B (zh) * 2023-05-16 2023-07-11 成都频岢微电子有限公司 一种单谐振器滤波器、多谐振器滤波器和射频前端模组

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CN112491367A (zh) * 2020-12-10 2021-03-12 富满微电子集团股份有限公司 低噪声放大电路、其控制方法与电子设备
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CN114070221A (zh) * 2021-11-17 2022-02-18 安徽安努奇科技有限公司 一种滤波器电路及电子设备

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