CN107834997B - Filtering gain circuit - Google Patents
Filtering gain circuit Download PDFInfo
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- CN107834997B CN107834997B CN201711299360.6A CN201711299360A CN107834997B CN 107834997 B CN107834997 B CN 107834997B CN 201711299360 A CN201711299360 A CN 201711299360A CN 107834997 B CN107834997 B CN 107834997B
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- resistor
- capacitor
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- filter
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- 238000001914 filtration Methods 0.000 title description 6
- 239000003990 capacitor Substances 0.000 claims abstract description 47
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/46—One-port networks
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
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- Networks Using Active Elements (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
The invention relates to the field of electronic measuring instruments, in particular to a filter gain circuit. The first filter circuit filters a received signal and outputs the signal to the input end of the first amplifier, the output end of the first amplifier is connected with a power supply through the second filter circuit, and meanwhile, the output end of the first amplifier outputs the signal to the port 3 of the first mixer through the third filter circuit; the port 8 of the first mixer outputs signals to the port 5 of the second mixer through a fourth filter circuit and a second amplifier, and meanwhile, the port 5 of the first mixer outputs signals to the port 8 of the second mixer through a first capacitor; the invention provides a filter gain circuit which realizes a preset signal processing flow through a specific circuit connection relation, so that the circuit works more stably.
Description
Technical Field
The invention relates to the field of electronic measuring instruments, in particular to a filter gain circuit.
Background
In the field of radio frequency signals, an electronic measuring instrument is an indispensable testing instrument, a signal source in the electronic measuring instrument is a core device of the electronic measuring instrument and is mainly responsible for generating radio signals with specific frequency and amplitude, if the signal source is the core device of the electronic measuring instrument, a filtering gain circuit is a core signal processing circuit for outputting qualified signals by the signal source, and the integral performance of the signal source is directly determined by the characteristics of the filtering gain circuit.
Disclosure of Invention
The invention aims to provide a filter gain circuit for an electronic measuring instrument signal source, which is in face of the technical requirement that a stable and reliable filter gain circuit is needed for a good signal source.
In order to achieve the above object, the present invention provides the following technical solutions:
the filter gain circuit comprises a first filter circuit, wherein the first filter circuit filters a received signal and outputs the filtered signal to the input end of a first amplifier, the output end of the first amplifier is connected with a power supply through a second filter circuit, and meanwhile, the output end of the first amplifier outputs the signal to a port 3 of a first mixer through a third filter circuit;
the port 8 of the first mixer outputs signals to the port 5 of the second mixer through a fourth filter circuit and a second amplifier, and meanwhile, the port 5 of the first mixer outputs signals to the port 8 of the second mixer through a first capacitor;
the second mixer port 3 outputs the signals after the signals are mixed through a fifth filter circuit;
the second amplifier is also connected with a power supply through a sixth filter circuit, and meanwhile, the output end of the second amplifier is also connected with the output end of the sixth filter circuit through a fourteenth resistor and a radio frequency choke coil.
Further, the first filter circuit is a pi-shaped filter structure formed by a first resistor, a second resistor and a third resistor;
the third filter circuit is a pi-shaped filter structure formed by a fourth resistor, a fifth resistor and a sixth resistor;
the fourth filter circuit is a pi-shaped filter structure formed by a seventh resistor, an eighth resistor and a ninth resistor;
further, the fifth filter circuit comprises a first low-pass filter and a fifth pi-shaped filter structure connected with the first low-pass filter, wherein the fifth pi-shaped filter structure is composed of an eleventh resistor, a twelfth resistor and a thirteenth resistor.
Further, the second filter circuit comprises a first feed-through capacitor, a first inductor, a tenth resistor and a second inductor which are connected in sequence;
the input end of the first feed-through capacitor is connected with a power supply; the free end of the second inductor is connected with the output end of the first amplifier;
the output end of the first feed-through capacitor is grounded through a second capacitor;
the first inductor and the tenth resistor 0 are grounded through a third capacitor at the same time;
the tenth resistor and the second inductor are grounded through a fourth capacitor at the same time.
Further, the sixth filter circuit includes a second feed-through capacitor; the output end of the second feed-through capacitor is connected with the port 4 of the second amplifier;
the output end of the second feed-through capacitor is grounded through a fifth capacitor and a sixth capacitor respectively.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a filter gain circuit for an electronic measuring instrument signal source, which realizes a preset signal processing flow through a specific circuit connection relation, so that the filter gain circuit provided by the invention works more stably, thereby achieving the purpose of outputting a radio frequency signal in a qualified target range.
Description of the drawings:
fig. 1 is a functional block diagram of the present invention.
Fig. 2 is a circuit connection diagram of a first filter circuit, a first amplifier, a second filter circuit, and a third filter circuit in the present invention.
Fig. 3 is a circuit connection diagram of the first mixer, the fourth filter circuit, the second amplifier, the sixth filter circuit, and the second mixer in the present invention.
Fig. 4 is a circuit connection diagram of a fifth filter circuit in the present invention.
Fig. 5 is a schematic block diagram of the front-end circuitry mentioned in the bit embodiment.
Fig. 6 is a circuit connection diagram of the second low-pass filter, the first digital step attenuator and the seventh filtering circuit according to the present invention.
Fig. 7 is a circuit connection diagram of the third low-pass filter, the second digital step attenuator and the eighth filtering circuit according to the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings and specific examples. It should not be construed that the scope of the above subject matter of the present invention is limited to the following embodiments, and all techniques realized based on the present invention are within the scope of the present invention.
Example 1: as shown in fig. 1 to 4, the present embodiment provides a filter gain circuit, which includes a first filter circuit 1, the first filter circuit 1 filters a received signal and outputs the filtered signal to an input end of a first amplifier 2, an output end of the first amplifier 2 is connected to a power supply through a second filter circuit 3, and meanwhile, the output end of the first amplifier 2 outputs the signal to a port 3 of a first mixer 5 through a third filter circuit 4; in this embodiment, the port 8 of the first mixer 5 outputs a signal to the port 5 of the second mixer 8 through the fourth filter circuit 6 and the second amplifier 7, and at the same time, the port 5 of the first mixer 5 outputs a signal to the port 8 of the second mixer 8 through the first capacitor C337; as shown in fig. 3, the port 1 and the port 2 of the first mixer 5 receive a signal amp in and a signal through in, respectively; the two signals are respectively fed back through the port 2 and the port 1 of the second mixer 8; the port 3 of the second mixer 8 outputs the mixed signal through a fifth filter circuit 9; the second amplifier 7 is further connected to a power supply via a sixth filter circuit 10, while the output of the second amplifier 7 is connected to the output of the sixth filter circuit 10.
The first filter circuit 1 is a pi-shaped filter structure formed by a first resistor R59, a second resistor R80 and a third resistor R81; the third filter circuit 4 is a pi-shaped filter structure formed by a fourth resistor R70, a fifth resistor R82 and a sixth resistor R83; the fourth filter circuit 6 is a pi-shaped filter structure formed by a seventh resistor R60, an eighth resistor R55 and a ninth resistor R56; the fifth filter circuit 9 includes a first low-pass filter F17, and a fifth pi-shaped filter structure connected to the first low-pass filter F17, where the fifth pi-shaped filter structure is composed of an eleventh resistor R85, a twelfth resistor R86, and a thirteenth resistor R87; the second filter circuit 3 comprises a first feed-through capacitor F15, a first inductor L6, a tenth resistor R140 and a second inductor L16 which are connected in sequence; the input end of the first feed-through capacitor F15 is connected with a power supply; the free end of the second inductor L16 is connected with the output end of the first amplifier 2; the output end of the first feed-through capacitor F15 is grounded through a second capacitor C98; the first inductor L6 and the tenth resistor R140 are grounded through a third capacitor C99 at the same time; the tenth resistor R140 is grounded through the fourth capacitor C248 simultaneously with the second inductor L16.
The sixth filter circuit 10 includes a second feed-through capacitor F16; the output of the second feed-through capacitor F16 is connected to the port 4 of the second amplifier 7; the output terminal of the second feed-through capacitor F16 is also grounded through the fifth capacitor C78 and the sixth capacitor C116, respectively.
The input signal ATT in the present embodiment is provided by a channel filter circuit as shown in fig. 5 to 7, the channel filter circuit comprising a second low-pass filter 11, the input end of the second low-pass filter 11 receiving the input signal, the output end being connected to the input end of the first digital step attenuator 12; in this embodiment, the output end of the first digital step attenuator 12 is connected to the input end of the third low-pass filter 13; the output end of the third low-pass filter 13 is connected with the input end of the second digital step attenuator 14; the output end of the second digital step attenuator 14 outputs a target signal ATT; the first digital step attenuator 12 and the second digital step attenuator 14 are PE4306; the LE port of the first digital step attenuator 12 is also connected to a power supply +3.3vatt1 through a seventh filter circuit 16; the LE port of the second digital step attenuator 14 is also connected to a power supply +3.3vat through an eighth filter circuit 15.
The seventh filter circuit 16 includes a fifteenth resistor R45 and a seventh capacitor C66 and an eighth capacitor C72 connected to both ends of the fifteenth resistor R45, respectively; the free ends of the seventh capacitor C66 and the eighth capacitor C72 are grounded.
The eighth filter circuit 15 includes a third feed-through capacitor F14 and a sixteenth resistor R40 connected in sequence; the input of the thirteenth feedthrough capacitor F14 is connected to the power +3.3 Vatt; the sixteenth resistor R40 is connected to the LE port of the second digital step attenuator 12. The eighth filter circuit 14 further includes a ninth capacitor C65 and a tenth capacitor C71 connected to both ends of the sixteenth resistor, respectively; the free ends of the ninth capacitor C65 and the tenth capacitor C71 are grounded.
Claims (1)
1. The filter gain circuit is characterized by comprising a first filter circuit, wherein the first filter circuit filters a received signal and outputs the filtered signal to the input end of a first amplifier, the output end of the first amplifier is connected with a power supply through a second filter circuit, and meanwhile, the output end of the first amplifier outputs the signal to a port of a first mixer through a third filter circuit;
the port of the first mixer outputs signals to the port of the second mixer through a fourth filter circuit and a second amplifier, and meanwhile, the port of the first mixer outputs signals to the port of the second mixer through a first capacitor;
the second mixer port outputs the signals after the signals are mixed through a fifth filter circuit;
the second amplifier is also connected with a power supply through a sixth filter circuit, and meanwhile, the output end of the second amplifier is also connected with the output end of the sixth filter circuit through a fourteenth resistor and a radio frequency choke coil;
the first filter circuit is a pi-shaped filter structure formed by a first resistor, a second resistor and a third resistor;
the third filter circuit is a pi-shaped filter structure formed by a fourth resistor, a fifth resistor and a sixth resistor;
the fourth filter circuit is a pi-shaped filter structure formed by a seventh resistor, an eighth resistor and a ninth resistor;
the fifth filter circuit comprises a first low-pass filter and a fifth pi-shaped filter structure connected with the first low-pass filter, wherein the fifth pi-shaped filter structure is composed of an eleventh resistor, a twelfth resistor and a thirteenth resistor;
the second filter circuit comprises a first feed-through capacitor, a first inductor, a tenth resistor and a second inductor which are connected in sequence;
the input end of the first feed-through capacitor is connected with a power supply; the free end of the second inductor is connected with the output end of the first amplifier;
the output end of the first feed-through capacitor is grounded through a second capacitor;
the first inductor and the tenth resistor are grounded through a third capacitor at the same time;
the tenth resistor and the second inductor are grounded through a fourth capacitor at the same time;
the sixth filter circuit includes a second feed-through capacitor; the output end of the second feed-through capacitor is connected with the port of the second amplifier;
the output end of the second feed-through capacitor is grounded through a fifth capacitor and a sixth capacitor respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299360.6A CN107834997B (en) | 2017-12-08 | 2017-12-08 | Filtering gain circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711299360.6A CN107834997B (en) | 2017-12-08 | 2017-12-08 | Filtering gain circuit |
Publications (2)
| Publication Number | Publication Date |
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| CN107834997A CN107834997A (en) | 2018-03-23 |
| CN107834997B true CN107834997B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711299360.6A Active CN107834997B (en) | 2017-12-08 | 2017-12-08 | Filtering gain circuit |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003198329A (en) * | 2001-12-28 | 2003-07-11 | Rf Chips Technology Inc | Active poly-phase filter amplifier, mixer circuit, and image rejection mixer |
| CN102970053A (en) * | 2012-12-17 | 2013-03-13 | 中国科学院半导体研究所 | Wireless sensor network application-oriented low-power consumption radio frequency receiving and sending device |
| CN203521567U (en) * | 2013-10-29 | 2014-04-02 | 成都九华圆通科技发展有限公司 | Miniaturized high-stability RF signal output module |
| CN203632646U (en) * | 2013-12-18 | 2014-06-04 | 中国电子科技集团公司第四十一研究所 | Microwave broadband frequency synthesis module |
| CN106841824A (en) * | 2016-12-15 | 2017-06-13 | 北京无线电计量测试研究所 | A kind of signal source comprehensive parameters field measurement apparatus |
| CN207573323U (en) * | 2017-12-08 | 2018-07-03 | 成都前锋电子仪器有限责任公司 | A kind of filtering gain circuit |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011066474A1 (en) * | 2009-11-24 | 2011-06-03 | Maxlinear, Inc. | Analog front end circuit for cable and wireless systems |
| US8750441B2 (en) * | 2010-12-20 | 2014-06-10 | Texas Instruments Incorporated | Signal cancellation to reduce phase noise, period jitter, and other contamination in local oscillator, frequency timing, or other timing generators or signal sources |
-
2017
- 2017-12-08 CN CN201711299360.6A patent/CN107834997B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003198329A (en) * | 2001-12-28 | 2003-07-11 | Rf Chips Technology Inc | Active poly-phase filter amplifier, mixer circuit, and image rejection mixer |
| CN102970053A (en) * | 2012-12-17 | 2013-03-13 | 中国科学院半导体研究所 | Wireless sensor network application-oriented low-power consumption radio frequency receiving and sending device |
| CN203521567U (en) * | 2013-10-29 | 2014-04-02 | 成都九华圆通科技发展有限公司 | Miniaturized high-stability RF signal output module |
| CN203632646U (en) * | 2013-12-18 | 2014-06-04 | 中国电子科技集团公司第四十一研究所 | Microwave broadband frequency synthesis module |
| CN106841824A (en) * | 2016-12-15 | 2017-06-13 | 北京无线电计量测试研究所 | A kind of signal source comprehensive parameters field measurement apparatus |
| CN207573323U (en) * | 2017-12-08 | 2018-07-03 | 成都前锋电子仪器有限责任公司 | A kind of filtering gain circuit |
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| CN107834997A (en) | 2018-03-23 |
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