CN202503480U - Low distortion gain-controlled circuit - Google Patents
Low distortion gain-controlled circuit Download PDFInfo
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- CN202503480U CN202503480U CN2012200135024U CN201220013502U CN202503480U CN 202503480 U CN202503480 U CN 202503480U CN 2012200135024 U CN2012200135024 U CN 2012200135024U CN 201220013502 U CN201220013502 U CN 201220013502U CN 202503480 U CN202503480 U CN 202503480U
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- amplification module
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Abstract
The utility model relates to a low distortion gain-controlled circuit which comprises a first gain amplification module, a first gain attenuation module, a second gain amplification module, a second gain attenuation module, a third gain amplification module, a third gain attenuation module, a fourth gain amplification module, a fourth gain attenuation module, a fifth gain attenuation module and a channel gain compensation module which are connected in order. Compared with the prior art, the utility model has the advantages of small bandwidth distortion, a large dynamic range and the like.
Description
Technical field
The utility model relates to a kind of controllable-gain circuit, especially relates to the controllable-gain circuit that a kind of WBD wideband distortion is little, dynamic range is big.
Background technology
Controllable-gain circuit be widely used in receiver in the middle of, the use of controllable-gain circuit makes receiver become possibility to the signal analysis of great dynamic range.Existing controllable-gain circuit mainly contains two kinds, and a kind of is digital, and a kind of is analog.Present digital controllable gain is mainly integrated circuit, and through the amplification and the decay of digital control scsi control lsi chip realization gain, advantage is that volume is little; Control logic is simple, and shortcoming is that the gain-adjusted scope is less, though can improve dynamic range during multi-stage cascade; But IP3; Index such as spuious is affected, and brings distortion, and inband flatness is relatively poor when big bandwidth.And along with the change of gain, noise factor is also along with change.Analogly be divided into two kinds again, a kind ofly be made up of transistor circuit, advantage is that IP3, key index such as spuious are better, and shortcoming is that the controllable gain bandwidth is less, and precision is relatively poor, and gain ranging is less, and the circuit more complicated.Another kind of regulate gain through aanalogvoltage, advantage is that IP3, index such as spuious are better, and can realize bigger gain bandwidth, and shortcoming is that the linearity is relatively poor, and gain ranging is less, and precision is relatively poor, and along with the change of gain, noise factor is also along with change.
The utility model content
The purpose of the utility model is exactly that a kind of broadband, distorted signals is little, dynamic range is big controllable-gain circuit are provided in order to overcome the defective that above-mentioned prior art exists.
The purpose of the utility model can realize through following technical scheme:
A kind of low distortion 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 described 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 and the 5th gain reduction module include put-through channel and gain-adjusted passage; Described put-through channel all is connected switching circuit with gain-adjusted passage two ends, carries out channel selecting through switching circuit.
The gain value of magnification of described first gain amplification module and the 3rd gain amplification module is 20dB, and the gain value of magnification of described second gain amplification module and the 4th gain amplification module is 10dB.
Gain-adjusted passage in the described first gain amplification module, the second gain amplification module, the 3rd gain amplification module and the 4th gain amplification module includes amplifier circuit in low noise and the adjustable gain attenuator circuit that is connected successively.
The gain reduction value of the described first gain reduction module is 16dB; The gain reduction value of the described second gain reduction module is 8dB; The gain reduction value of described the 3rd gain reduction module is 4dB; The gain reduction value of described the 4th gain reduction module is 2dB, and the gain reduction value of described the 5th gain reduction module is 1dB.
Gain-adjusted passage in the described first 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 the 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 the input and the output of channel gain compensating module; Described current mode DAC circuit connects the high-frequency triode gain circuitry, is used for the control signal of input high-frequency triode gain circuitry is carried out digital-to-analogue conversion.
Described switching circuit is the pin diode switch circuit.
Compared with prior art, the utlity model has following advantage:
1, gain bandwidth is wideer, can realize the gain-adjusted within the bandwidth range of 50k～1G Hz;
2, dynamic range is big, and dynamic range can reach-31dB～+ 60dB;
3, inband flatness can reach＜1dB;
4, IP3 is high, and is spuious little;
5, portable strong;
6, noise factor does not change along with the change of gain.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the utility model is elaborated.
Embodiment
As shown in Figure 1; A kind of low distortion controllable-gain circuit; This circuit is made up of 10 gain adjustment module, is respectively successively the first gain amplification module 11 that connects, the first gain reduction module 12, the 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 channel gain compensating module 13.
Except that channel gain compensating module 13, all the other modules include put-through channel and two signalling channels of gain-adjusted passage, and the selection of passage is controlled through the switching circuit that is located at put-through channel and gain-adjusted passage two ends.The gain value of magnification of the first gain amplification module 11 and the 3rd gain amplification module 31 is 20dB; The gain value of magnification that the second gain amplification module 21 and the 4th gains amplification module 41 is 10dB, and the gain reduction value of the first gain reduction module 12, the 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 distinguished as follows:
The 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 the 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 the amplification of 20dB.If need switch to direct mode operation; Switch controlling signal a1 control pin diode switch circuit 111 switches to put-through channel with pin diode switch circuit 114; Input signal is not carried out gain-adjusted, amplifier cut-off signals a2 turn-offs amplifier circuit in low noise 112 to reduce the interference to signal simultaneously.
The first gain reduction module 12: comprise pin diode switch circuit 121, fixed attenuator circuit 122 and pin diode switch circuit 123; Modular circuit under the 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 the decay of 16dB.If will switch to direct mode operation, then switch to put-through channel with pin diode switch circuit 123 through switch controlling signal b1 control two pin diode switch circuit 121, input signal is not carried out gain-adjusted.
The 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 the 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 the amplification of 10dB.If need switch to direct mode operation; Switch controlling signal c1 control pin diode switch circuit 211 switches to put-through channel with pin diode switch circuit 214; Input signal is not carried out gain-adjusted, amplifier cut-off signals c2 turn-offs amplifier circuit in low noise 212 to reduce the interference to signal simultaneously.
The second gain reduction module 22: comprise pin diode switch circuit 221, fixed attenuator circuit 222 and pin diode switch circuit 223; Modular circuit under the 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 the decay of 8dB.If will switch to direct mode operation, then switch to put-through channel with pin diode switch circuit 223 through switch controlling signal d1 control two pin diode switch circuit 221, input signal is not carried out gain-adjusted.
The 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 the 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 the amplification of 20dB.If need switch to direct mode operation; Switch controlling signal e1 control pin diode switch circuit 311 switches to put-through channel with pin diode switch circuit 314; Input signal is not carried out gain-adjusted, amplifier cut-off signals e2 turn-offs amplifier circuit in low noise 312 to reduce the interference to signal simultaneously.
The 3rd gain reduction module 32: comprise pin diode switch circuit 321, fixed attenuator circuit 322 and pin diode switch circuit 323; Modular circuit under the 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 the decay of 4dB.If will switch to direct mode operation, then switch to put-through channel with pin diode switch circuit 323 through switch controlling signal f1 control two pin diode switch circuit 321, input signal is not carried out gain-adjusted.
The 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 the 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 the amplification of 10dB.If need switch to direct mode operation; Switch controlling signal g1 control pin diode switch circuit 411 switches to put-through channel with pin diode switch circuit 414; Input signal is not carried out gain-adjusted, amplifier cut-off signals g2 turn-offs amplifier circuit in low noise 412 to reduce the interference to signal simultaneously.
The 4th gain reduction module 42: comprise pin diode switch circuit 421, fixed attenuator circuit 422 and pin diode switch circuit 423; Modular circuit under the 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 the decay of 2dB.If will switch to direct mode operation, then switch to put-through channel with pin diode switch circuit 423 through switch controlling signal h1 control two pin diode switch circuit 421, input signal is not carried out gain-adjusted.
The 4th gain reduction module 52: comprise pin diode switch circuit 521, fixed attenuator circuit 522 and pin diode switch circuit 523; Modular circuit under the 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 the decay of 1dB.If will switch to direct mode operation, then switch to put-through channel with pin diode switch circuit 523 through switch controlling signal i1 control two pin diode switch circuit 521, input signal is not carried out gain-adjusted.
Channel gain compensating module 13: the high-frequency triode gain circuitry 131 and current mode DAC circuit 132 that comprise Current Control; Input signal through after aforesaid 9 modules adjusting carries out gain compensation by high-frequency triode gain circuitry 131 at last, promptly exports final signal.Current mode DAC circuit 132 connects high-frequency triode gain circuitry 131; Be used for gain compensation control signal j is carried out digital-to-analogue conversion; Import high-frequency triode gain circuitry 131 then; Thereby regulate the emitter voltage of high-frequency triode, realize gain compensation the signal of exporting from the high-frequency triode collector electrode.
When 4 the gain amplification modules all be in direct mode operation, 5 gain reduction modules all are in the gain-adjusted state, then the gain of signalling channel be-(16dB+ (8dB)+(4dB)+(2dB)+(IdB)) for 31dB.
When 4 the gain amplification modules all be in the gain-adjusted state, 5 gain reduction modules all are in direct mode operation, then the gain of signalling channel is 60dB (20dB+10dB+20dB+10dB).
-31dB～+ the 60dB scope within, select the mode of operation of 9 gain adjustment module through switch controlling signal, can realize the signalling channel gain-31dB～+ the 60dB scope within the 1dB step gain regulate, thereby guaranteed the precision of whole gain circuitry.Owing to adopted the main element of PIN diode as switching circuit; Can realize between two passages channel separation function greater than 40dB; This circuit can be realized the gain controlling within the bandwidth range of 50k～1G Hz, and inband flatness can reach＜IdB, and IP3 is high, spuious little; Portable strong, noise factor does not change with the change of gain.
Claims (8)
1. low distortion 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.
2. a kind of low distortion controllable-gain circuit according to claim 1; It is characterized in that; The described 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 and the 5th gain reduction module include put-through channel and gain-adjusted passage, and described put-through channel and gain-adjusted passage two ends all are connected with the switching circuit that is used to carry out channel selecting.
3. a kind of low distortion controllable-gain circuit according to claim 2; It is characterized in that; The gain value of magnification of described first gain amplification module and the 3rd gain amplification module is 20dB, and the gain value of magnification of described second gain amplification module and the 4th gain amplification module is 10dB.
4. a kind of low distortion controllable-gain circuit according to claim 3; It is characterized in that the gain-adjusted passage in the described first gain amplification module, the second gain amplification module, the 3rd gain amplification module and the 4th gain amplification module includes amplifier circuit in low noise and the adjustable gain attenuator circuit that is connected successively.
5. a kind of low distortion controllable-gain circuit according to claim 2; It is characterized in that; The gain reduction value of the described first gain reduction module is 16dB, and the gain reduction value of the described second gain reduction module is 8dB, and the gain reduction value of described the 3rd gain reduction module is 4dB; The gain reduction value of described the 4th gain reduction module is 2dB, and the gain reduction value of described the 5th gain reduction module is 1dB.
6. a kind of low distortion controllable-gain circuit according to claim 5; It is characterized in that the gain-adjusted passage in the described first 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.
7. a kind of low distortion controllable-gain circuit according to claim 2; It is characterized in that; Described channel gain compensating module comprises the 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 the input and the output of channel gain compensating module, and described current mode DAC circuit connects the high-frequency triode gain circuitry.
8. a kind of low distortion controllable-gain circuit according to claim 2 is characterized in that described switching circuit is the pin diode switch circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200135024U CN202503480U (en) | 2012-01-13 | 2012-01-13 | Low distortion gain-controlled circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200135024U CN202503480U (en) | 2012-01-13 | 2012-01-13 | Low distortion gain-controlled circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202503480U true CN202503480U (en) | 2012-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200135024U Expired - Lifetime CN202503480U (en) | 2012-01-13 | 2012-01-13 | Low distortion gain-controlled circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN202503480U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208971A (en) * | 2012-01-13 | 2013-07-17 | 上海创远仪器技术股份有限公司 | Controllable gain circuit |
| CN105323022A (en) * | 2014-10-21 | 2016-02-10 | 航天恒星科技有限公司 | Device and method for continuously adjusting G/T value of system quality factor |
-
2012
- 2012-01-13 CN CN2012200135024U patent/CN202503480U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103208971A (en) * | 2012-01-13 | 2013-07-17 | 上海创远仪器技术股份有限公司 | Controllable gain circuit |
| CN103208971B (en) * | 2012-01-13 | 2015-10-28 | 上海创远仪器技术股份有限公司 | A kind of controllable-gain circuit |
| CN105323022A (en) * | 2014-10-21 | 2016-02-10 | 航天恒星科技有限公司 | Device and method for continuously adjusting G/T value of system quality factor |
| CN105323022B (en) * | 2014-10-21 | 2019-03-12 | 航天恒星科技有限公司 | A kind of device and method that system quality factor G/T value is continuously adjustable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121024 |