KR101609637B1 - Filter device - Google Patents
Filter device Download PDFInfo
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- KR101609637B1 KR101609637B1 KR1020140012472A KR20140012472A KR101609637B1 KR 101609637 B1 KR101609637 B1 KR 101609637B1 KR 1020140012472 A KR1020140012472 A KR 1020140012472A KR 20140012472 A KR20140012472 A KR 20140012472A KR 101609637 B1 KR101609637 B1 KR 101609637B1
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Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter device, and a filter device of the present invention includes an antenna unit for receiving (or transmitting) a radio frequency signal; A plurality of matching units connected to the antenna unit, each matching unit including an inductance (L) and a capacitance (C) component for impedance matching; A plurality of band amplifiers connected respectively to the plurality of matching units and amplifying the signals transmitted through the matching units for respective bands; (L) and a capacitance (C) component of a matching unit connected to a band amplification unit that is not currently operating among the plurality of band amplification units, to a currently operating band amplification unit according to a control signal to constitute an LC resonance circuit And a changing section for changing a capacitance (C) component in the configured LC resonant circuit; And control means for outputting the control signal for controlling the filter means according to the operation states of the plurality of band amplifying units and inputting the control signal to the filter means.
Description
BACKGROUND OF THE
In general, an RF transceiver or a system on chip (SOC) refers to a system capable of transmitting and receiving a specific signal component of a baseband in the form of an RF signal of an antenna through an antenna.
All transmit and receive systems use separate elements inside or outside the chip or use circuit design techniques for impedance matching with specific antennas.
In a multi-band or multi-standard system, individual matching is required for each band or standard. In order to minimize the influence of signals of different bands on their band, A front surface acoustic wave filter (SAW filter), a duplexer, a triplexer, a band-pass filter, or a band-stop filter An additional device is connected to achieve bandpass or band rejection.
1 is a block diagram of a conventional general multi-band receiver.
1, a conventional multi-band receiver includes an
As shown in block A, the
As another conventional multi-band receiver, there are multi-band receivers shown in Figs. 2 and 3, respectively.
2, a plurality of antennas 7, 8.9 are connected to a plurality of
3 includes a
As described above, in the conventional RF transmission / reception system, a band-pass filter such as a SAW filter, a diplexer, or a triplexer is installed in order to remove a blocker signal at the time of constructing the input stage, And an additional area is consumed in the RF transceiver or chip.
Disclosure of Invention Technical Problem [8] The present invention has been made to solve the problems of the conventional art as described above, and it is an object of the present invention to eliminate an unwanted signal of another band by using an internal element of the RF transmission / reception system without using a separate filter element And to provide a filter device capable of simplifying the system.
A filter device according to a first aspect of the present invention includes: an antenna unit (110) for receiving (or transmitting) a radio frequency signal; A plurality of matching units 130 connected to the antenna unit 110, each matching unit 130 including an inductance L and a capacitance C for impedance matching; A plurality of band amplifiers connected respectively to the plurality of matching units 130 and amplifying signals transmitted through the matching unit 130 for each band; (L) and a capacitance (C) component of the matching unit 130 connected to the band amplifying unit that is not currently operating among the plurality of band amplifying units to the currently operating band amplifying unit according to the control signal, Filter means constituting a resonance circuit, and including a changing portion for changing a capacitance (C) component in the configured LC resonance circuit; And control means for outputting the control signal for controlling the filter means according to the operation states of the plurality of band amplifying units and inputting the control signal to the filter means.
According to the second aspect of the present invention, the filter means can be configured to have a notch filter characteristic that removes only a specific frequency component by changing the capacitance (C) component in the configured LC resonance circuit .
Further, according to the third aspect of the present invention, the changing portion may be a variable capacitor.
According to a fourth aspect of the present invention, the filter unit further includes a matching unit (130) operating in accordance with a control signal from the control unit and connected to a band amplification unit not currently operating among the plurality of band amplification units, And the inductance L and the capacitance C of the matching unit 130 connected to the currently operating band amplifying unit are cut off from the signal path between the antenna unit 110 and the antenna unit 110, And a plurality of switching elements connected to the ground amplifying part and to the ground terminal on the other side.
According to a fifth aspect of the present invention, the filter unit further includes a filter unit configured to filter the inductance (L) and the capacitance (C) components of the matching unit (130) connected to the band- And can be connected to the input side of the currently operating band amplification unit.
According to a sixth aspect of the present invention, the filter unit further includes a filter unit configured to filter the inductance (L) and the capacitance (C) components of the matching unit (130) connected to the band- It can be connected to the internal circuit side of the currently operating band amplification section.
According to a seventh aspect of the present invention, the filter means further includes a filter unit that filters inductance (L) and capacitance (C) components of the matching unit (130) connected to the band- And can be connected to the output side of the currently operating band amplification section.
According to an eighth aspect of the present invention, the plurality of band amplifying units may be a low-noise amplifier ("LNA").
According to the present invention, it is possible to simplify the system by utilizing the internal elements of the RF transmission / reception system and eliminating unwanted signals in other bands without using a separate filter element.
In particular, according to another aspect of the present invention, by utilizing the elements of the input side matching unit as a notch filter to show band rejection characteristics for unwanted signals of other bands, the deterioration of the system with respect to unwanted signals of other bands . And, since the notch frequency can be changed by adjusting the capacitance (C) component of the changing part, it is easy to cope with the unwanted frequency.
1 is a block diagram of a multi-band receiver according to a first conventional example.
2 is a block diagram of a multi-band receiver according to a second conventional example.
3 is a block diagram of a multi-band receiver according to a third conventional example.
4 is a diagram for explaining the principle of the present invention.
5 is a circuit diagram showing an example of a multi-band receiver to which a filter device is applied, according to an embodiment of the present invention.
6 is a view for explaining an operation example of a multi-band receiver to which a filter device is applied, according to an embodiment of the present invention.
7 is a schematic circuit diagram of a multi-band receiver to which a filter device according to a modification of the present invention is applied.
8 is a schematic circuit configuration diagram of a multi-band receiver to which a filter device according to another modification of the present invention is applied.
9 is a graph showing a gain characteristic of a low noise amplifier of a multi-band receiver to which the filter device of the present invention is applied.
10 is a schematic view illustrating a first application example of the present invention.
FIG. 11A is a second application example of the present invention, and FIG. 11B is a schematic view illustrating a third application example of the present invention.
12 is a graph showing an example of a frequency response (gain characteristic) when a single input is merged.
The details of other embodiments are included in the detailed description and drawings.
BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.
4 is a diagram for explaining the principle of the present invention.
In Fig. 4, (a) is a schematic view of an LC series resonance circuit when the matching unit is L1 and the changing unit is C1. In FIG. 4A, when the capacitance value of the changing part C1 is changed, Vsource, that is, the impedance when viewed from the antenna end side shows characteristics of a low impedance or short at the LC resonance frequency ( 4 (b)).
In other words, when a notch filter is implemented using the matching unit and LC resonance occurs at the frequency of the block ker signal by using the LC resonance, the block ker signal component is not the receiving end that is currently receiving the wanted signal, The signal is transmitted through the resonant notch, thereby improving the blocker performance.
In one embodiment
5 is a circuit diagram showing an example of a multi-band receiver to which a filter device is applied, according to an embodiment of the present invention. 5, a multi-band receiver to which a filter device according to an embodiment of the present invention is applied includes an
The
The
The filter means 60 is operated in accordance with the control signal inverted through the inverter IV1 and the inverter IV1 for inverting the control signal from the control means so that the inductance between the inductor L1 and the
The filter means 60 is connected to the capacitor C1 through the capacitor C1 and a second variable capacitor C5 connected between the low-
The filter means 60 is operated in accordance with the control signal inverted through the inverter IV1 so as to connect or disconnect the first variable capacitor C4 and the second variable capacitor C5, A second variable capacitor C5 having one end commonly connected to the fourth switching element SW4 and one end of the capacitor C2 and the second band
Now, an operation example of a multi-band receiver to which the filter device is applied according to an embodiment of the present invention will be described with reference to FIG.
A radio frequency signal is received from the outside through the
The control means monitors the operation state of each of the
The first band ON signal outputted from the control means is applied to the second and third switching elements SW2 and SW3 and inverted through the inverter Iv1 so that the first and fourth switching elements SW1 , SW4.
The second and third switching devices SW2 and SW3 are turned off to cut off the path between the
The first and fourth switching devices SW1 and SW4 are turned on to connect one end of the first band inductor L1 of the
Thereby, an LC series resonant circuit composed of the inductor L1 for the first band, the capacitor C1 and the first variable capacitor C4 is formed between the
Here, the notch filter can be tuned by adjusting the capacitance value of the first variable capacitor C4 so that the frequency becomes a specific frequency (or the frequency at which the blocker signal exists), and the target predetermined frequency component can be tuned to the notch filter Can be removed.
The capacitance value of the first variable capacitor C4 may preferably be adjusted by a control signal of the manual adjustment or control means.
The circuits inside the low-noise amplifier in the band operating as the notch filter are all open (input impedance is high) (for example, by control of the control means) .
That is, by configuring the notch filter by utilizing the inductance (L) component and the capacitance (C) component of the matching section of the band not currently operating, a bandpass filter is no longer needed for the input signal from the
In the embodiment illustrated in FIGS. 5 and 6, the filter means 60 can use the inductance (L) component and the capacitance (C) component of the matching portion of the first band as a notch filter. It will be apparent to those skilled in the art that a configuration capable of using the inductance (L) component and the capacitance (C) component of the second band and the third band as a notch filter can be easily conceived with reference to this example, It will be understood that they fall within the scope of the invention.
5 and 6, the filter device of the present invention is applied to a multi-band receiver. However, those skilled in the art will appreciate that the filter device of the present invention can be applied to a multi- Band transceiver and that it is within the scope of the present invention.
Variation example
7 is a schematic circuit diagram of a multi-band receiver to which a filter device according to a modification of the present invention is applied. 7, the configuration of FIGS. 5 and 6 is different from the configuration of FIG. 5 except that the other end of the fourth switch SW4 of the filter means 60-1 is connected to the output terminal of the second band low-
7, the LC series resonance circuit is constructed by connecting the output side of the low-
8 is a schematic circuit configuration diagram of a multi-band receiver to which a filter device according to another modification of the present invention is applied. In Fig. 8, the configuration of Figs. 5 and 6 differs from that of Figs. 5 and 6 in that the other end of the fourth switch SW4 of the filter means 60-2 is connected to the internal circuit of the second band low-
8, the LC series resonance circuit is constructed by connecting the internal circuit of the low-
9 is a graph showing a gain characteristic of a low noise amplifier of a multi-band receiver to which the filter device of the present invention is applied.
9, the difference between the gain characteristics of the low noise amplifier when the filter means 60 to 60-2 of the filter device of the present invention is operated to implement the notch filter and when the notch filter is not implemented have.
That is, it can be seen that the notch filtering effect is exhibited at the specific frequency by the action of the notch filter, and the target specific frequency component can be removed.
Application example
10 is a schematic view illustrating a first application example of the present invention, and is an application configuration in which the filter device of the present invention is applied to a general common-source low noise amplifier (LNA) 8 to 8).
FIG. 11A is a schematic view illustrating a third application example of the present invention, wherein FIG. 11A is a schematic view illustrating the filter device of the present invention in two bands FIG. 11B shows an example in which notch filters of two bands having LC resonance values of 70 to 110 MHz and 170 to 250 MHz are configured for a single input, and FIG. (The internal configuration of the specific filter device is the configuration of Figs. 5 to 8).
In this case, an example of the frequency response (gain characteristic) when a single input is merged is as shown in FIG. 12. As can be seen from FIG. 12, the frequency component of the 200 MHz band is amplified to obtain a high gain And the blocker component of the 100 MHz band is rejected by the notch filter to have a low gain.
It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is to be understood, therefore, that the embodiments described above are to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and their equivalents It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (8)
A plurality of matching units connected to the antenna unit, each matching unit including an inductance (L) and a capacitance (C) component for impedance matching;
A plurality of band amplifiers connected respectively to the plurality of matching units and amplifying the signals transmitted through the matching units for respective bands;
(L) and a capacitance (C) component of a matching unit connected to a band amplification unit that is not currently operating among the plurality of band amplification units, to a currently operating band amplification unit according to a control signal to constitute an LC resonance circuit And a changing section for changing a capacitance (C) component in the configured LC resonant circuit; And
And control means for outputting the control signal for controlling the filter means according to the operation states of the plurality of band amplification units and inputting the control signal to the filter means,
Wherein the filter means is configured to have a notch filter characteristic that removes only a specific frequency component by changing a capacitance (C) component in the configured LC resonance circuit,
And controls all the circuits inside the band amplification section operating as the notch filter to be in an open state.
Wherein the changing portion is a variable capacitor.
Wherein the filter means comprises:
And a control unit that operates in accordance with a control signal from the control unit to cut off a signal path between a matching unit connected to a band amplification unit that is not currently operating among the plurality of band amplification units and the antenna unit, And a plurality of switching elements for connecting the inductance (L) and the capacitance (C) components of the matching part connected to the amplifying part to the currently operating band amplifying part and connecting the other end to the grounding part, Filter device.
Wherein the filter means connects an inductance (L) and a capacitance (C) component of a matching unit connected to a band amplifier unit that is not currently operating among the plurality of band amplifier units to an input side of a currently operating band amplifier unit.
Wherein the filter means is a filter that connects the inductance (L) and the capacitance (C) components of the matching unit connected to the band amplifying unit that is not currently operating among the plurality of band amplifying units to the internal circuit side of the currently operating band amplifying unit Device.
Wherein the filter means connects an inductance (L) and a capacitance (C) component of a matching unit connected to a band amplifier unit that is not currently operating among the plurality of band amplifier units to an output side of a currently operating band amplifier unit.
Wherein the plurality of band amplifiers comprise:
And a low-noise amplifier ("LNA").
Applications Claiming Priority (2)
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KR20130062810 | 2013-05-31 | ||
KR1020130062810 | 2013-05-31 |
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KR20140141422A KR20140141422A (en) | 2014-12-10 |
KR101609637B1 true KR101609637B1 (en) | 2016-04-06 |
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KR1020140012472A KR101609637B1 (en) | 2013-05-31 | 2014-02-04 | Filter device |
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US10396750B2 (en) | 2016-08-26 | 2019-08-27 | Samsung Electro-Mechanics Co., Ltd. | Radio frequency transmitter having improved receive band rejection function |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007180956A (en) | 2005-12-28 | 2007-07-12 | Mitsumi Electric Co Ltd | Low noise amplifier, and antenna device provided with the low noise amplifier |
JP2009530939A (en) | 2006-03-17 | 2009-08-27 | ノキア コーポレイション | Transmitter, power amplifier, and filtering method |
JP2011250099A (en) | 2010-05-26 | 2011-12-08 | Fujitsu Ten Ltd | Antenna amplifier device and antenna device |
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Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007180956A (en) | 2005-12-28 | 2007-07-12 | Mitsumi Electric Co Ltd | Low noise amplifier, and antenna device provided with the low noise amplifier |
JP2009530939A (en) | 2006-03-17 | 2009-08-27 | ノキア コーポレイション | Transmitter, power amplifier, and filtering method |
JP2011250099A (en) | 2010-05-26 | 2011-12-08 | Fujitsu Ten Ltd | Antenna amplifier device and antenna device |
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