CN211406008U - Frequency modulation receiving amplifier - Google Patents
Frequency modulation receiving amplifier Download PDFInfo
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- CN211406008U CN211406008U CN202020599475.8U CN202020599475U CN211406008U CN 211406008 U CN211406008 U CN 211406008U CN 202020599475 U CN202020599475 U CN 202020599475U CN 211406008 U CN211406008 U CN 211406008U
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 51
- 230000004913 activation Effects 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 230000006641 stabilisation Effects 0.000 description 3
- 238000011105 stabilization Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
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Abstract
The utility model discloses a frequency modulation receiving amplifier, including frequency modulation receiving module, frequency modulation receiving module is connected with frequency selection network, kernel voltage supply end, frequency modulation output circuit and frequency modulation enable end, frequency selection network is connected with frequency modulation receiving module's output pin, and kernel voltage supply end is connected with frequency modulation receiving module's power supply pin, and frequency modulation output circuit is connected with frequency modulation receiving module's input pin, and frequency modulation enable end is connected with frequency modulation receiving module's enable pin, be equipped with voltage stabilizing circuit between frequency modulation receiving module's the power supply pin of voltage supply end and frequency modulation receiving module, voltage stabilizing circuit is connected with frequency modulation receiving module's power supply pin, frequency modulation receiving module's ground connection pin ground connection; the voltage stabilizing circuit is arranged to stabilize the voltage of the frequency modulation receiving amplifier, so that clear and stable frequency modulation content can be received.
Description
Technical Field
The utility model relates to a broadcast signal modulation field is received to function cell-phone specifically is frequency modulation receiving amplifier.
Background
Am broadcasting started in 1920 and fm broadcasting started in 1940. In China, from the 50 s to the 60 s in the 20 th century, medium-short wave broadcasting develops rapidly, and FM (frequency modulation) broadcasting rises rapidly in the 70 s, so that the tone quality of broadcasting is improved remarkably, and the FM broadcasting is widely applied. Although the conventional audio broadcasting has once become a second important media mode with the rapid development of televisions, internet and mobile communication networks, and the development speed is far behind that of other main propagation modes, the audio broadcasting still has important media forms with specific application environments and requirements, and the development of the audio broadcasting still has a wide prospect with the emergence of new technologies.
In the field of functional mobile phones, fm broadcasting is also an important application direction, so a corresponding fm receiver for receiving fm is equipped on a functional mobile phone, and the received signal needs to be amplified to receive clear and stable fm content, and the amplified fm signal causes unstable circuit voltage, so how to keep the voltage stability of the fm receiving amplifier while ensuring that clear and stable fm content is received becomes an urgent problem in the field of receiving broadcast signals by functional mobile phones.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome prior art and the unstable not enough of voltage of frequency modulation receiving amplifier when enlargiing frequency modulation, provide a frequency modulation receiving amplifier, stabilize frequency modulation receiving amplifier's voltage through setting up voltage stabilizing circuit to the guarantee can receive clear stable frequency modulation content.
The purpose of the utility model is mainly realized through the following technical scheme:
the frequency modulation receiving amplifier comprises a frequency modulation receiving module, the frequency modulation receiving module is connected with a frequency selection network, a kernel voltage supply end, a frequency modulation output circuit and a frequency modulation enabling end, wherein,
the frequency selection network is used for receiving the frequency modulation signals, carrying out primary frequency band screening and inputting the screened frequency modulation signals into the frequency modulation receiving module;
the kernel voltage supply end is used for providing working voltage for the frequency modulation receiving amplifier;
the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal;
the frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module;
the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit;
the frequency selection network is connected with an input pin of the frequency modulation receiving module, the kernel voltage supply end is connected with a power supply pin of the frequency modulation receiving module, the frequency modulation output circuit is connected with an output pin of the frequency modulation receiving module, the frequency modulation enabling end is connected with an enabling pin of the frequency modulation receiving module, a voltage stabilizing circuit is arranged on a line between the kernel voltage supply end and the power supply pin of the frequency modulation receiving module, and a grounding pin of the frequency modulation receiving module is grounded.
In the utility model, in order to ensure that the functional mobile phone can stably and effectively receive the frequency modulation signal, the frequency selection network is arranged to carry out preliminary screening of frequency bands, the screened signal is input into the frequency modulation receiving module through the output pin of the frequency modulation receiving module, the frequency modulation receiving module amplifies the small signal and outputs the frequency modulation signal to the main chip through the frequency modulation output circuit for further processing, the whole frequency modulation amplifier is powered by the inner core voltage supply end, the inner core voltage supply end is the chip inner core voltage, so the utility model mainly depends on the inner core voltage of the chip to supply power, the frequency modulation enable end in the utility model mainly plays the role of being responsible for the input and output of the control signal, the feeding and the disconnection of the frequency modulation signal are controlled through the frequency modulation enable end, because the inner core voltage supply end provides the chip inner core voltage, in order to ensure the voltage stability of frequency modulation receiving amplifier, so set up voltage stabilizing circuit, voltage stabilizing circuit can get off frequency modulation amplifier's voltage stabilization to guarantee frequency modulation signal transmission's stability is effective, the utility model discloses in stabilize frequency modulation receiving amplifier's voltage through setting up voltage stabilizing circuit, thereby the guarantee can receive clear stable frequency modulation content.
Further, the voltage stabilizing circuit comprises a capacitor C134, one end of the capacitor C134 is connected to a line between a power supply pin of the fm receiving module and the core voltage supply terminal, and the other end of the capacitor C134 is grounded. The capacitor C134 is a voltage-stabilizing capacitor of the frequency modulation receiving module, voltage stabilization is performed by utilizing the charge-discharge principle of the capacitor, when the voltage of the inner core is higher than the voltage at two ends of the capacitor, the power supply charges the capacitor, the voltage at two ends of the capacitor is kept unchanged, when the voltage of the inner core is lower than the voltage at two ends of the capacitor, the capacitor discharges to the frequency modulation receiving module, so that the voltage of the frequency modulation receiving module is kept stable, the voltage-stabilizing capacitor is grounded, the redundant voltage can be led out, high-frequency fluctuation of an electrifying signal can be filtered, and the voltage supply of.
Further, the frequency selection network includes an inductor L111, an inductor L112, an inductor L113, a capacitor C132, and a capacitor C133, the inductor L113, and the inductor L111 are sequentially connected in series, the other end of the capacitor C133, which is connected to the end of the inductor L113, is connected to an input pin of the frequency modulation receiving module, the other end of the inductor L111, which is connected to the end of the inductor L113, is used for inputting a frequency modulation signal, the inductor L112 is connected to the capacitor C132 in parallel, one end of the parallel circuit is connected to a line between the inductor L113 and the inductor L111, and the other end of the parallel circuit is grounded. The utility model discloses a frequency-selective network tentatively selects suitable frequency modulation frequency channel to spread into frequency modulation receiving module from frequency modulation receiving module's output pin with the frequency channel of selecting, electric capacity C132 and inductance L112 parallelly connected formation resonant circuit in the frequency-selective network, the parallel circuit through electric capacity C132 and inductance L112 forms the selection to high frequency signal, the utility model discloses can pass through effectual frequency channel screening, effectively filter the frequency modulation signal who receives.
Furthermore, the frequency modulation output circuit comprises a capacitor C135, one end of the capacitor C135 is connected with an output pin of the frequency modulation receiving module, and the other end of the capacitor C135 is connected with a frequency modulation receiving end of the mobile phone main chip. Electric capacity C135 is isolation electric capacity, can follow the DC circuit through isolation electric capacity and keep apart essence safety circuit and non essence safety circuit the utility model discloses in, isolation electric capacity C135 can utilize the nature of condenser "leading to exchange, separate the direct current", forms the resistance-capacitance coupling between frequency modulation receiving module and main chip for do not have the relation on the direct current between main chip and the frequency modulation receiving module, make the frequency modulation output stable effective.
Furthermore, the frequency modulation receiving module further comprises a resistor R14, and two ends of the resistor R14 are respectively connected with an input pin and an output pin of the frequency modulation receiving module. The principle is that the resistor consumes ringing power, and can also be considered as reducing the Q value of the transmission line, the resistor is arranged on a signal line with higher requirements for signal integrity, and because the design of the integrated circuit always has a stable time and a holding time, the ringing phenomenon can be eliminated through the consumption of the resistor R14.
To sum up, compared with the prior art, the utility model has the following beneficial effects:
(1) through setting up voltage stabilizing circuit, voltage stabilizing circuit can get off frequency modulation amplifier's voltage stabilization to guarantee that frequency modulation signal transmission's is stable effective, the utility model discloses in stabilize frequency modulation receiving amplifier's voltage through setting up voltage stabilizing circuit, thereby the guarantee can receive clear stable frequency modulation content.
(2) The voltage is stabilized by utilizing the charge-discharge principle of the capacitor C134, when the voltage of the inner core is higher than the voltage at two ends of the capacitor, the power supply charges the capacitor, so that the voltage at two ends of the capacitor is kept unchanged, and when the voltage of the inner core is lower than the voltage at two ends of the capacitor, the capacitor discharges to the frequency modulation receiving module, so that the voltage of the frequency modulation receiving module is kept stable.
(3) And a resistance-capacitance coupling is formed between the frequency modulation receiving module and the main chip, so that no direct current connection exists between the main chip and the frequency modulation receiving module, and the frequency modulation output is stable and effective.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example (b):
as shown in fig. 1, the FM receiving module in this embodiment adopts an FM receiving amplifier with a model number of LNA S7177, which is mainly used to amplify received FM signals, and the FM-SANT interface, the FM-EN terminal, and the core voltage supply terminal VDDIO-2 are all connected to a main chip of the functional mobile phone, which is an ASIC-SC6531F-175-0.4 model.
The frequency modulation receiving amplifier in the embodiment comprises a frequency modulation receiving module, wherein the frequency modulation receiving module is connected with a frequency selection network, an inner core voltage supply end, a frequency modulation output circuit and a frequency modulation enabling end,
the frequency selection network is used for receiving the frequency modulation signals, carrying out primary frequency band screening and inputting the screened frequency modulation signals into the frequency modulation receiving module; the frequency selection network comprises an inductor L111, an inductor L112, an inductor L113, a capacitor C132 and a capacitor C133, wherein the capacitor C133, the inductor L113 and the inductor L111 are sequentially connected in series, the other end, opposite to the end connected with the inductor L113, of the capacitor C133 is connected with an input pin of the frequency modulation receiving module, the other end, opposite to the end connected with the inductor L113, of the inductor L111 is used for inputting frequency modulation signals, the inductor L112 is connected with the capacitor C132 in parallel, one end of the parallel circuit is connected to a line between the inductor L113 and the inductor L111, and the other end of the parallel circuit is grounded.
The kernel voltage supply end is used for providing working voltage for the frequency modulation receiving amplifier;
the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal; the frequency modulation output circuit comprises a capacitor C135, one end of the capacitor C135 is connected with an output pin of the frequency modulation receiving module, and the other end of the capacitor C135 is connected with a frequency modulation receiving end of the mobile phone main chip.
The frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module;
the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit; the embodiment further includes a resistor R14, and two ends of the resistor R14 are respectively connected to the input pin and the output pin of the fm receiver module.
The frequency selection network is connected with an input pin of the frequency modulation receiving module, the kernel voltage supply end is connected with a power supply pin of the frequency modulation receiving module, the frequency modulation output circuit is connected with an output pin of the frequency modulation receiving module, the frequency modulation enabling end is connected with an enabling pin of the frequency modulation receiving module, a voltage stabilizing circuit is arranged on a line between the kernel voltage supply end and the power supply pin of the frequency modulation receiving module, and a grounding pin of the frequency modulation receiving module is grounded; the voltage stabilizing circuit comprises a capacitor C134, one end of the capacitor C134 is connected to a line between a power supply pin of the frequency modulation receiving module and a kernel voltage supply end, and the other end of the capacitor C134 is grounded.
In this embodiment, the FM broadcast signal is subjected to preliminary frequency band screening through a frequency selection network composed of an inductor L111, an inductor L112, a capacitor C132, an inductor L113, and a capacitor C133, then the screened signal is input through an output pin of the FM receiving module, is output through an input pin after being amplified by the FM receiving module, and is then transmitted to the main control chip for processing through an FM-SANT interface of the main control chip through an isolation capacitor C135, and the capacitor C134 is a voltage stabilizing capacitor of the FM receiving module to stabilize the working voltage of the FM receiving module.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The frequency modulation receiving amplifier is characterized by comprising a frequency modulation receiving module, wherein the frequency modulation receiving module is connected with a frequency selection network, an inner core voltage supply end, a frequency modulation output circuit and a frequency modulation enabling end, wherein,
the frequency selection network is used for receiving the frequency modulation signals, carrying out primary frequency band screening and inputting the screened frequency modulation signals into the frequency modulation receiving module;
the kernel voltage supply end is used for providing working voltage for the frequency modulation receiving amplifier;
the frequency modulation output circuit receives the frequency modulation signal of the frequency modulation receiving module, blocks direct current and outputs the frequency modulation signal;
the frequency modulation enabling end receives an activation signal of the mobile phone main chip and sends the activation signal to the frequency modulation receiving module;
the frequency modulation receiving module receives the frequency modulation signal of the frequency selection network, amplifies the frequency modulation signal and outputs the frequency modulation signal from the frequency modulation output circuit;
the frequency selection network is connected with an input pin of the frequency modulation receiving module, the kernel voltage supply end is connected with a power supply pin of the frequency modulation receiving module, the frequency modulation output circuit is connected with an output pin of the frequency modulation receiving module, the frequency modulation enabling end is connected with an enabling pin of the frequency modulation receiving module, a voltage stabilizing circuit is arranged on a line between the kernel voltage supply end and the power supply pin of the frequency modulation receiving module, and a grounding pin of the frequency modulation receiving module is grounded.
2. A fm receiver amplifier as claimed in claim 1, wherein the regulator circuit includes a capacitor C134, one end of the capacitor C134 is connected to a line between the supply pin of the fm receiver module and the core voltage supply terminal, and the other end of the capacitor C134 is connected to ground.
3. The FM receiving amplifier of claim 1, wherein the frequency selecting network comprises an inductor L111, an inductor L112, an inductor L113, a capacitor C132 and a capacitor C133, the inductor L113 and the inductor L111 are connected in series in sequence, the other end of the capacitor C133 opposite to the end connected with the inductor L113 is connected with an input pin of the FM receiving module, the other end of the inductor L111 opposite to the end connected with the inductor L113 is used for inputting FM signals, the inductor L112 is connected in parallel with the capacitor C132, one end of the parallel circuit is connected to a line between the inductor L113 and the inductor L111, and the other end of the parallel circuit is grounded.
4. A fm receiver amplifier as claimed in claim 1, wherein the fm output circuit includes a capacitor C135, one end of the capacitor C135 is connected to the output pin of the fm receiver module, and the other end of the capacitor C135 is connected to the fm receiver of the mobile phone main chip.
5. A fm receiver amplifier as claimed in claim 1, further comprising a resistor R14, wherein two ends of the resistor R14 are connected to the input pin and the output pin of the fm receiver module, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020599475.8U CN211406008U (en) | 2020-04-20 | 2020-04-20 | Frequency modulation receiving amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020599475.8U CN211406008U (en) | 2020-04-20 | 2020-04-20 | Frequency modulation receiving amplifier |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211406008U true CN211406008U (en) | 2020-09-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020599475.8U Expired - Fee Related CN211406008U (en) | 2020-04-20 | 2020-04-20 | Frequency modulation receiving amplifier |
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| Country | Link |
|---|---|
| CN (1) | CN211406008U (en) |
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2020
- 2020-04-20 CN CN202020599475.8U patent/CN211406008U/en not_active Expired - Fee Related
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Granted publication date: 20200901 |