CN103208971B - A kind of controllable-gain circuit - Google Patents
A kind of controllable-gain circuit Download PDFInfo
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- CN103208971B CN103208971B CN201210009324.2A CN201210009324A CN103208971B CN 103208971 B CN103208971 B CN 103208971B CN 201210009324 A CN201210009324 A CN 201210009324A CN 103208971 B CN103208971 B CN 103208971B
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Abstract
The present invention relates to a kind of controllable-gain circuit, comprise the first gain amplification module, the first gain reduction module, the second gain amplification module, the second gain reduction module, the 3rd gain amplification module, the 3rd gain reduction module, the 4th gain amplification module, the 4th gain reduction module, the 5th gain reduction module and the channel gain compensating module that connect successively.Compared with prior art, the present invention has the advantages such as distorted signals is little, dynamic range is large.
Description
Technical field
The present invention relates to a kind of controllable-gain circuit, especially relate to a kind of broadband and distorted signals is little, dynamic range is large controllable-gain circuit.
Background technology
Controllable-gain circuit is widely used in the middle of receiver, and the use of controllable-gain circuit makes the signal analysis of receiver to great dynamic range become possibility.Existing controllable-gain circuit mainly contains two kinds, and one is digital, and one is analog.Present digital controllable gain is mainly integrated circuit, amplification and the decay of gain is realized by digital control interface control integration circuit chip, advantage is that volume is little, control logic is simple, and shortcoming is that gain-adjusted scope is less, although can improve dynamic range during multi-stage cascade, but IP3, the index such as spuious is affected, and bring distortion, when large bandwidth, inband flatness is poor.And along with the change of gain, noise factor is also along with change.Analogly be divided into again two kinds, one is made up of transistor circuit, and advantage is that IP3, the key index such as spuious are better, and shortcoming is that controllable gain bandwidth is less, and precision is poor, and gain ranging is less, and circuit more complicated.Another kind of regulate gain by analog voltage, advantage is that IP3, the index such as spuious are better, and can realize larger gain bandwidth, and shortcoming is that the linearity is poor, and gain ranging is less, and precision is poor, and along with the change of gain, noise factor is also along with change.
Summary of the invention
Object of the present invention is exactly provide a kind of broadband, distorted signals is little, dynamic range is large controllable-gain circuit to overcome defect that above-mentioned prior art exists.
Object of the present invention can be achieved through the following technical solutions:
A kind of controllable-gain circuit, comprises the first gain amplification module, the first gain reduction module, the second gain amplification module, the second gain reduction module, the 3rd gain amplification module, the 3rd gain reduction module, the 4th gain amplification module, the 4th gain reduction module, the 5th gain reduction module and the channel gain compensating module that connect successively.
The first described gain amplification module, the first gain reduction module, the second gain amplification module, the second gain reduction module, the 3rd gain amplification module, the 3rd gain reduction module, the 4th gain amplification module, the 4th gain reduction module and the 5th gain reduction module include put-through channel and gain-adjusted passage, the equal connecting valve circuit of described put-through channel and gain-adjusted passage two ends, carries out channel selecting by switching circuit.
The first described gain amplification module and the gain amplification value of the 3rd gain amplification module are 20dB, and the second described gain amplification module and the gain amplification value of the 4th gain amplification module are 10dB.
The first described gain amplification module, the second gain amplification module, the 3rd gain amplification module and the gain-adjusted passage in the 4th gain amplification module include the amplifier circuit in low noise and adjustable gain attenuator circuit that are connected successively.
The gain reduction value of the first described gain reduction module is 16dB, the gain reduction value of the second described gain reduction module is 8dB, the gain reduction value of the 3rd described gain reduction module is 4dB, the gain reduction value of the 4th described gain reduction module is 2dB, and the gain reduction value of the 5th described gain reduction module is 1dB.
Gain-adjusted passage in the first described gain reduction module, the second gain reduction module, the 3rd gain reduction module, the 4th gain reduction module and the 5th gain reduction module includes a fixed attenuator circuit.
Described channel gain compensating module comprises high-frequency triode gain circuitry and the current mode DAC-circuit of Current Control, the input of described high-frequency triode gain circuitry and output are respectively input and the output of channel gain compensating module, described current mode DAC-circuit connects high-frequency triode gain circuitry, for carrying out digital-to-analogue conversion to the control signal of input high-frequency triode gain circuitry.
Described switching circuit is pin diode switch circuit.
Compared with prior art, the present invention has the following advantages:
1, gain bandwidth is wider, the gain-adjusted within the bandwidth range that can realize 50k ~ 1G Hz;
2, dynamic range is large, and dynamic range can reach-31dB ~+60dB;
3, inband flatness can reach < 1dB;
4, IP3 is high, spuious little;
5, portable strong;
6, noise factor does not change along with the change of gain.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
As shown in Figure 1, a kind of controllable-gain circuit, this circuit is made up of 10 gain adjustment module, is respectively the first gain amplification module 11, first gain reduction module 12, second gain amplification module 21, the second gain reduction module 22, the 3rd gain amplification module 31, the 3rd gain reduction module 32, the 4th gain amplification module 41, the 4th gain reduction module 42, the 5th gain reduction module 52 and the channel gain compensating module 13 that connect successively.
Except channel gain compensating module 13, all the other modules include put-through channel and gain-adjusted passage two signalling channels, and the selection of passage is controlled by the switching circuit being located at put-through channel and gain-adjusted passage two ends.The gain amplification value of the first gain amplification module 11 and the 3rd gain amplification module 31 is 20dB, the gain amplification value of the second gain amplification module 21 and the 4th gain amplification module 41 is 10dB, and the gain reduction value of the first gain reduction module 12, second gain reduction module 22, the 3rd gain reduction module 32, the 4th gain reduction module 42 and the 5th gain reduction module 52 is followed successively by 16dB, 8dB, 4dB, 2dB, 1dB.
The concrete structure of 10 gain adjustment module is as follows respectively:
First gain amplification module 11: comprise pin diode switch circuit 111, amplifier circuit in low noise 112, adjustable damping circuit 113, pin diode switch circuit 114, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 111, amplifier circuit in low noise 112, adjustable damping circuit 113, pin diode switch circuit 114 connect successively, signal are carried out to the amplification of 20dB.If desired direct mode operation is switched to, switch controlling signal a1 controls pin diode switch circuit 111 and pin diode switch circuit 114 is switched to put-through channel, do not carry out gain-adjusted to input signal, amplifier cut-off signals a2 turns off amplifier circuit in low noise 112 to reduce the interference to signal simultaneously.
First gain reduction module 12: comprise pin diode switch circuit 121, fixed attenuator circuit 122 and pin diode switch circuit 123, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 121, fixed attenuator circuit 122, pin diode switch circuit 123 connect successively, signal are carried out to the decay of 16dB.To switch to direct mode operation, then controlling two pin diode switch circuit 121 by switch controlling signal b1 and pin diode switch circuit 123 is switched to put-through channel, gain-adjusted not being carried out to input signal.
Second gain amplification module 21: comprise pin diode switch circuit 211, amplifier circuit in low noise 212, adjustable damping circuit 213, pin diode switch circuit 214, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 211, amplifier circuit in low noise 212, adjustable damping circuit 213, pin diode switch circuit 214 connect successively, signal are carried out to the amplification of 10dB.If desired direct mode operation is switched to, switch controlling signal c1 controls pin diode switch circuit 211 and pin diode switch circuit 214 is switched to put-through channel, do not carry out gain-adjusted to input signal, amplifier cut-off signals c2 turns off amplifier circuit in low noise 212 to reduce the interference to signal simultaneously.
Second gain reduction module 22: comprise pin diode switch circuit 221, fixed attenuator circuit 222 and pin diode switch circuit 223, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 221, fixed attenuator circuit 222, pin diode switch circuit 223 connect successively, signal are carried out to the decay of 8dB.To switch to direct mode operation, then controlling two pin diode switch circuit 221 by switch controlling signal d1 and pin diode switch circuit 223 is switched to put-through channel, gain-adjusted not being carried out to input signal.
3rd gain amplification module 31: comprise pin diode switch circuit 311, amplifier circuit in low noise 312, adjustable damping circuit 313, pin diode switch circuit 314, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 311, amplifier circuit in low noise 312, adjustable damping circuit 313, pin diode switch circuit 314 connect successively, signal are carried out to the amplification of 20dB.If desired direct mode operation is switched to, switch controlling signal e1 controls pin diode switch circuit 311 and pin diode switch circuit 314 is switched to put-through channel, do not carry out gain-adjusted to input signal, amplifier cut-off signals e2 turns off amplifier circuit in low noise 312 to reduce the interference to signal simultaneously.
3rd gain reduction module 32: comprise pin diode switch circuit 321, fixed attenuator circuit 322 and pin diode switch circuit 323, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 321, fixed attenuator circuit 322, pin diode switch circuit 323 connect successively, signal are carried out to the decay of 4dB.To switch to direct mode operation, then controlling two pin diode switch circuit 321 by switch controlling signal fl and pin diode switch circuit 323 is switched to put-through channel, gain-adjusted not being carried out to input signal.
4th gain amplification module 41: comprise pin diode switch circuit 411, amplifier circuit in low noise 412, adjustable damping circuit 413, pin diode switch circuit 414, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 411, amplifier circuit in low noise 412, adjustable damping circuit 413, pin diode switch circuit 414 connect successively, signal are carried out to the amplification of 10dB.If desired direct mode operation is switched to, switch controlling signal g1 controls pin diode switch circuit 411 and pin diode switch circuit 414 is switched to put-through channel, do not carry out gain-adjusted to input signal, amplifier cut-off signals g2 turns off amplifier circuit in low noise 412 to reduce the interference to signal simultaneously.
4th gain reduction module 42: comprise pin diode switch circuit 421, fixed attenuator circuit 422 and pin diode switch circuit 423, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 421, fixed attenuator circuit 422, pin diode switch circuit 423 connect successively, signal are carried out to the decay of 2dB.To switch to direct mode operation, then controlling two pin diode switch circuit 421 by switch controlling signal h1 and pin diode switch circuit 423 is switched to put-through channel, gain-adjusted not being carried out to input signal.
4th gain reduction module 52: comprise pin diode switch circuit 521, fixed attenuator circuit 522 and pin diode switch circuit 523, modular circuit under gain-adjusted pattern consists of: pin diode switch circuit 521, fixed attenuator circuit 522, pin diode switch circuit 523 connect successively, signal are carried out to the decay of 1dB.To switch to direct mode operation, then controlling two pin diode switch circuit 521 by switch controlling signal i1 and pin diode switch circuit 523 is switched to put-through channel, gain-adjusted not being carried out to input signal.
Channel gain compensating module 13: the high-frequency triode gain circuitry 131 and the current mode DAC-circuit 132 that comprise Current Control, input signal after aforesaid 9 modules regulate finally carries out gain compensation by high-frequency triode gain circuitry 131, namely exports final signal.Current mode DAC-circuit 132 connects high-frequency triode gain circuitry 131, for carrying out digital-to-analogue conversion to gain compensation control signal j, then high-frequency triode gain circuitry 131 is inputted, thus regulate the emitter voltage of high-frequency triode, realize the gain compensation to the signal exported from high-frequency triode collector electrode.
When 4 gain amplification modules are all in direct mode operation, 5 gain reduction modules are all in gain-adjusted state, then the gain of signalling channel is-31dB (-16dB+ (-8dB)+(-4dB)+(-2dB)+(-1dB)).
When 4 gain amplification modules are all in gain-adjusted state, 5 gain reduction modules are all in direct mode operation, then the gain of signalling channel is 60dB (20dB+10dB+20dB+10dB).
Within-31dB ~+60dB scope, selected the mode of operation of 9 gain adjustment module by switch controlling signal, signalling channel gain 1dB step gain within-31dB ~+60dB scope can be realized and regulate, thus ensure that the precision of whole gain circuitry.Owing to have employed the main element of PIN diode as switching circuit, the channel separation function being greater than 40dB between two passages can be realized, this circuit can realize the gain control within the bandwidth range of 50k ~ 1G Hz, inband flatness can reach < 1dB, and IP3 is high, spuious little, portable strong, noise factor does not change with the change of gain.
Claims (5)
1. a controllable-gain circuit, it is characterized in that, comprise the first gain amplification module, the first gain reduction module, the second gain amplification module, the second gain reduction module, the 3rd gain amplification module, the 3rd gain reduction module, the 4th gain amplification module, the 4th gain reduction module, the 5th gain reduction module and the channel gain compensating module that connect successively;
The first described gain amplification module, the first gain reduction module, the second gain amplification module, the second gain reduction module, the 3rd gain amplification module, the 3rd gain reduction module, the 4th gain amplification module, the 4th gain reduction module and the 5th gain reduction module include put-through channel and gain-adjusted passage, the equal connecting valve circuit of described put-through channel and gain-adjusted passage two ends, carries out channel selecting by switching circuit;
The first described gain amplification module and the gain amplification value of the 3rd gain amplification module are 20dB, the second described gain amplification module and the gain amplification value of the 4th gain amplification module are 10dB, the gain reduction value of the first described gain reduction module is 16dB, the gain reduction value of the second described gain reduction module is 8dB, the gain reduction value of the 3rd described gain reduction module is 4dB, the gain reduction value of the 4th described gain reduction module is 2dB, and the gain reduction value of the 5th described gain reduction module is 1dB.
2. a kind of controllable-gain circuit according to claim 1, it is characterized in that, the first described gain amplification module, the second gain amplification module, the 3rd gain amplification module and the gain-adjusted passage in the 4th gain amplification module include the amplifier circuit in low noise and adjustable gain attenuator circuit that are connected successively.
3. a kind of controllable-gain circuit according to claim 1, it is characterized in that, the gain-adjusted passage in the first described gain reduction module, the second gain reduction module, the 3rd gain reduction module, the 4th gain reduction module and the 5th gain reduction module includes a fixed attenuator circuit.
4. a kind of controllable-gain circuit according to claim 1, it is characterized in that, described channel gain compensating module comprises high-frequency triode gain circuitry and the current mode DAC-circuit of Current Control, the input of described high-frequency triode gain circuitry and output are respectively input and the output of channel gain compensating module, described current mode DAC-circuit connects high-frequency triode gain circuitry, for carrying out digital-to-analogue conversion to the control signal of input high-frequency triode gain circuitry.
5. a kind of controllable-gain circuit according to claim 1, is characterized in that, described switching circuit is pin diode switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210009324.2A CN103208971B (en) | 2012-01-13 | 2012-01-13 | A kind of controllable-gain circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210009324.2A CN103208971B (en) | 2012-01-13 | 2012-01-13 | A kind of controllable-gain circuit |
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| CN103208971A CN103208971A (en) | 2013-07-17 |
| CN103208971B true CN103208971B (en) | 2015-10-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111162809B (en) * | 2019-12-13 | 2022-04-15 | 西安易朴通讯技术有限公司 | Wireless receiver and wireless device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1265475A (en) * | 1999-01-23 | 2000-09-06 | 大宇通信株式会社 | Gain control optical amplifier |
| CN1485981A (en) * | 2002-09-26 | 2004-03-31 | ������������ʽ���� | Variable gain amplifier for use in communications |
| CN201118584Y (en) * | 2007-11-07 | 2008-09-17 | 深圳国人通信有限公司 | A TD-SCDMA trunk amplifier |
| CN102270972A (en) * | 2011-04-18 | 2011-12-07 | 上海信朴臻微电子有限公司 | Variable-gain amplifier |
| CN202503480U (en) * | 2012-01-13 | 2012-10-24 | 上海创远仪器技术股份有限公司 | Low distortion gain-controlled circuit |
-
2012
- 2012-01-13 CN CN201210009324.2A patent/CN103208971B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1265475A (en) * | 1999-01-23 | 2000-09-06 | 大宇通信株式会社 | Gain control optical amplifier |
| CN1485981A (en) * | 2002-09-26 | 2004-03-31 | ������������ʽ���� | Variable gain amplifier for use in communications |
| CN201118584Y (en) * | 2007-11-07 | 2008-09-17 | 深圳国人通信有限公司 | A TD-SCDMA trunk amplifier |
| CN102270972A (en) * | 2011-04-18 | 2011-12-07 | 上海信朴臻微电子有限公司 | Variable-gain amplifier |
| CN202503480U (en) * | 2012-01-13 | 2012-10-24 | 上海创远仪器技术股份有限公司 | Low distortion gain-controlled circuit |
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| CN103208971A (en) | 2013-07-17 |
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Address after: Block C, No. 7, Lane 205, Gaoji Road, Songjiang District, Shanghai, 201601 Patentee after: Chuangyuan Xinke (Shanghai) Technology Co.,Ltd. Address before: 201611 Shanghai Songjiang District Chedun town Xiangche Road No. 206 Patentee before: TRANSCOM INSTRUMENTS Co.,Ltd. |
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