CN106374850A - Voltage-controlled continuously adjustable attenuation circuit - Google Patents
Voltage-controlled continuously adjustable attenuation circuit Download PDFInfo
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- CN106374850A CN106374850A CN201510443566.6A CN201510443566A CN106374850A CN 106374850 A CN106374850 A CN 106374850A CN 201510443566 A CN201510443566 A CN 201510443566A CN 106374850 A CN106374850 A CN 106374850A
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Abstract
The invention discloses a voltage-controlled continuous adjustable attenuation circuit comprising a monitoring power supply VCC, and also comprising a reverse fixed value amplifier and an attenuation circuit, wherein the monitoring power supply VCC is connected with the reverse fixed value amplifier, an output end of the reverse fixed value amplifier controls the attenuation circuit via a sampling resistor, and an input signal end Vi of the voltage-controlled continuous adjustable attenuation circuit is connected with an output signal end Vo via the attenuation circuit. An MOS tube Q1 is an attenuation adjusting device, linear change of resistance is achieved by changing circulation current between a source and a drain of the MOS tube, and thus voltage-controlled continuously adjustable attenuation is achieved. The voltage-controlled continuously adjustable attenuation circuit aims at solving the problem that as the output of a power amplification circuit changes, the circuit is turned off due to too low power supply voltage, and thus continuousness of communication is influenced, and the circuit is simple, the stability is high and the application range is wide.
Description
Technical field
The present invention relates to a kind of voltage-controlled continuously adjustabe attenuator circuit, it is applied to reduce the change to supply voltage when load becomes big,
Voltage-controlled continuously adjustabe attenuator circuit in specifically a kind of meter terminal communication amplifying circuit for low pressure.
Background technology
Under the conditions of using linear transformer, its overload can make transformator output too low to low pressure meter terminal.But same transformation
Device will not transship in view of 90% time and this specification is usually used, but because 10% probability overload, may result in whole
Individual system work is abnormal.As shown in figure 1, the method typically this being solved is load string current-limiting resistance, but so will
Current-limiting resistance in action, so that decreasing output amplitude in the case of non-overloaded, or uses low voltage control in all cases
Breaking circuit but lead to amplifying circuit cannot export, also have by change gain by way of, reduce the shadow to power supply for the power output
Ring, but so can not complete to pursue least cost.
Content of the invention
The present invention is directed to problem present in background technology, provides a kind of voltage-controlled continuously adjustabe attenuator circuit it is intended to solve existing
The timing of linear power one, emergent power amplifying circuit load overload leads to power supply to fall problem.
Technical scheme: a kind of voltage-controlled continuously adjustabe attenuator circuit, including monitoring power supply vcc, it also includes reverse definite value
Amplifier and attenuator circuit, described supervision power supply vcc connects reverse definite value amplifier, the output of reverse definite value amplifier
End controls attenuator circuit by sample resistance, and the input signal end vi of voltage-controlled continuously adjustabe attenuator circuit is followed by through attenuator circuit
Output signal end vo；Described attenuator circuit can set maximum attenuation and minimal attenuation definite value and include mos pipe q1 and damping resistance
R1, r2, r3, wherein: input signal end vi is connected damping resistance r1 latter aspect and is grounded after damping resistance r2,
On the other hand the drain electrode of mos pipe q1 is connect by damping resistance r3；Output signal end vo be connected on damping resistance r1, r2,
The node that connects of r3；The source ground of mos pipe q1, the reversed outfan to definite value amplifier of grid of mos pipe q1 is simultaneously
It is controlled.
More specifically, described reverse definite value amplifier includes sample resistance r4, r5, audion q2, collector resistance r6,
Emitter resistance r7, biasing resistor r9, r10, wherein: described supervision power supply vcc passes through collector resistance r6 even
Connect the colelctor electrode of audion q2, the colelctor electrode of audion q2 is grounded also by after concatenation sample resistance r5, r4；Audion
The emitter stage of q2 is grounded by emitter resistance r7；Described supervision power supply vcc concatenation biasing resistor r9, r10 are followed by
Ground, the connection of biasing resistor r9, r10 terminates the base stage of audion q2.
Preferably, described reverse definite value amplifier also includes Zener diode dz1, and described Zener diode dz1 is serially connected in three
Between the base stage of pole pipe q2 and biasing resistor r9.
Preferably, described reverse definite value amplifier also includes electric capacity c1, c2, and the base stage of described audion q2 passes through electric capacity c1
After be grounded, described supervision power supply vcc is grounded after electric capacity c2.
Beneficial effects of the present invention:
Using technical scheme disclosed by the invention, the change with voltage of attenuator circuit controls and continuously adjustabe, and the linearity is preferable,
Simple circuit stability is high, applied widely.
Brief description
Fig. 1 is the circuit theory diagrams of existing power amplification circuit.
Fig. 2 is the circuit theory diagrams of the voltage-controlled continuously adjustabe attenuator circuit of the present invention.
Fig. 3 is the structured flowchart of the voltage-controlled continuously adjustabe attenuator circuit of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, to this
Bright be further elaborated, specific embodiment described herein only in order to explain the present invention, is not used to limit this
Bright:
Operation principle:
Amplifier: vo (output)=a (gain) vi (input)
When output voltage is excessive output is excessive change supply voltage when, a kind of mode is to change gain a, and another kind is then
Change input signal vi.The present invention is exactly to monitor that the result of power supply vcc changes input signal vi size and then maintains electricity
Source voltage is in set point.
As shown in Fig. 2-Fig. 3.For convenience of description, illustrate only the part related to the embodiment of the present invention.
Embodiment 1, a kind of voltage-controlled continuously adjustabe attenuator circuit, including monitoring power supply vcc, it also includes reverse definite value and puts
Big device and attenuator circuit, described supervision power supply vcc connects reverse definite value amplifier, the outfan of reverse definite value amplifier
Attenuator circuit is controlled by sample resistance, the input signal end vi of voltage-controlled continuously adjustabe attenuator circuit is followed by defeated through attenuator circuit
Go out signal end vo；Described attenuator circuit includes mos pipe q1 and damping resistance r1, r2, r3, wherein: input signal end
Vi is connected damping resistance r1 latter aspect and is grounded after damping resistance r2, on the other hand meets mos by damping resistance r3
The drain electrode of pipe q1；Output signal end vo is connected on the node that connects of damping resistance r1, r2, r3；The source electrode of mos pipe q1
Ground connection, the reversed outfan to definite value amplifier of grid of mos pipe q1 is simultaneously controlled.
Embodiment 2, a kind of voltage-controlled continuously adjustabe attenuator circuit as described in Example 1, described reverse definite value amplifier includes taking
Sample resistance r4, r5, audion q2, collector resistance r6, emitter resistance r7, biasing resistor r9, r10, wherein:
Described supervision power supply vcc passes through the colelctor electrode of collector resistance r6 connecting triode q2, the colelctor electrode of audion q2
It is grounded also by after concatenation sample resistance r5, r4；The emitter stage of audion q2 is grounded by emitter resistance r7；Described
It is grounded after monitoring power supply vcc concatenation biasing resistor r9, r10, the connection termination audion of biasing resistor r9, r10
The base stage of q2.
Embodiment 3, a kind of voltage-controlled continuously adjustabe attenuator circuit as described in Example 2, described reverse definite value amplifier also includes
Zener diode dz1, described Zener diode dz1 is serially connected between the base stage of audion q2 and biasing resistor r9.Non-
Under wide temperature requires, Zener diode dz1 can not be used, complete this function by changing sample resistance ratio.
Embodiment 4, a kind of voltage-controlled continuously adjustabe attenuator circuit as described in Example 2, described reverse definite value amplifier also includes
Electric capacity c1, c2, the base stage of described audion q2 is grounded after electric capacity c1, and described supervision power supply vcc passes through electricity
It is grounded after holding c2.
Work process:
When power supply vcc is in normal work interval (such as > 10v), Zener diode dz1 (5.1v) Zener breakdown, three poles
Pipe q2 at saturation interval (collector voltage < 1v), the grid voltage of mos pipe q1 (cut-in voltage under cut-in voltage
5v), it is believed that open circuit between the source and drain of mos pipe q1, at this moment output (vo) is:
Vo=vir2/ (r1+r2)
When because the output overloading (for example load resistor value diminishes) of reverse definite value amplifier leads to monitored power supply vcc
Step-down (less than 9v), audion q2 departs from zone of saturation to amplification region, and its output makes mos pipe q1 entrance lead in 5v
Logical, at this moment output (vo) is:
Vo=vir/ (r1+r)
R=r2//(r3+rds)
Wherein, rds is the source and drain equivalent resistance of audion q2.
When supply voltage (vcc) is further reduced to 8v, audion q2 exports to 7v, and mos pipe q1 leads completely
Logical, at this moment the rds of audion q2 is negligible (< 10 Europe), and at this moment output (vo) is:
Vo=vir/ (r1+r)
R=r2//r3
If r3 is 0 it is believed that signal is substantially all is attenuated --- completing vo by decay is 0.
Specific embodiment described herein is only that spirit of the present invention is illustrated.The skill of the technical field of the invention
Art personnel can be made various modifications or supplement or substituted using similar mode to described specific embodiment, but not
The spirit of the present invention can be deviateed or surmount scope defined in appended claims.
Claims (4)
1. a kind of voltage-controlled continuously adjustabe attenuator circuit, including monitoring power supply vcc it is characterised in that it also includes reverse definite value puts
Big device and attenuator circuit, described supervision power supply vcc connects reverse definite value amplifier, the outfan of reverse definite value amplifier
Attenuator circuit is controlled by sample resistance, the input signal end vi of voltage-controlled continuously adjustabe attenuator circuit is followed by defeated through attenuator circuit
Go out signal end vo；Described attenuator circuit includes mos pipe q1 and damping resistance r1, r2, r3, wherein: input signal end
Vi is connected damping resistance r1 latter aspect and is grounded after damping resistance r2, on the other hand meets mos by damping resistance r3
The drain electrode of pipe q1；Output signal end vo is connected on the node that connects of damping resistance r1, r2, r3；The source electrode of mos pipe q1
Ground connection, the reversed outfan to definite value amplifier of grid of mos pipe q1 is simultaneously controlled.
2. a kind of voltage-controlled continuously adjustabe attenuator circuit according to claim 1 is it is characterised in that described reverse definite value amplifier includes
Sample resistance r4, r5, audion q2, collector resistance r6, emitter resistance r7, biasing resistor r9, r10, wherein:
Described supervision power supply vcc passes through the colelctor electrode of collector resistance r6 connecting triode q2, the colelctor electrode of audion q2
It is grounded also by after concatenation sample resistance r5, r4；The emitter stage of audion q2 is grounded by emitter resistance r7；Described
It is grounded after monitoring power supply vcc concatenation biasing resistor r9, r10, the connection termination audion of biasing resistor r9, r10
The base stage of q2.
3. a kind of voltage-controlled continuously adjustabe attenuator circuit according to claim 2 is it is characterised in that described reverse definite value amplifier also wraps
Include Zener diode dz1, described Zener diode dz1 is serially connected between the base stage of audion q2 and biasing resistor r9.
4. a kind of voltage-controlled continuously adjustabe attenuator circuit according to claim 2 is it is characterised in that described reverse definite value amplifier also wraps
Include electric capacity c1, c2, the base stage of described audion q2 is grounded after electric capacity c1, described supervision power supply vcc passes through
It is grounded after electric capacity c2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443566.6A CN106374850B (en) | 2015-07-24 | 2015-07-24 | A kind of voltage-controlled continuously adjustable attenuator circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510443566.6A CN106374850B (en) | 2015-07-24 | 2015-07-24 | A kind of voltage-controlled continuously adjustable attenuator circuit |
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| Publication Number | Publication Date |
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| CN106374850A true CN106374850A (en) | 2017-02-01 |
| CN106374850B CN106374850B (en) | 2019-05-07 |
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| CN201510443566.6A Active CN106374850B (en) | 2015-07-24 | 2015-07-24 | A kind of voltage-controlled continuously adjustable attenuator circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839626A (en) * | 2021-11-25 | 2021-12-24 | 广州慧智微电子股份有限公司 | Circuit and method for protecting amplifier |
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| JPH08298413A (en) * | 1995-04-27 | 1996-11-12 | Nec Yamagata Ltd | Emitter-grounded amplifier circuit |
| CN1830138A (en) * | 2003-07-07 | 2006-09-06 | 美国模拟器件公司 | Variable attenuation system having continuous input steering |
| CN101051856A (en) * | 2007-01-30 | 2007-10-10 | 深圳国人通信有限公司 | Voltage control attenuator, method for realizing voltage control attenuator and application circuit |
| CN102195591A (en) * | 2011-04-02 | 2011-09-21 | 中国电子科技集团公司第二十四研究所 | Linear electrically controlled attenuator |
| CN104362984A (en) * | 2014-11-18 | 2015-02-18 | 无锡科思电子科技有限公司 | High-accuracy TR (Transmitter and Receiver) assembly using simple LNA (Low Noise Amplifier) circuit |
| CN104753483A (en) * | 2013-12-30 | 2015-07-01 | 国民技术股份有限公司 | Power amplifier and gain reduction circuit thereof |
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2015
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08298413A (en) * | 1995-04-27 | 1996-11-12 | Nec Yamagata Ltd | Emitter-grounded amplifier circuit |
| CN1830138A (en) * | 2003-07-07 | 2006-09-06 | 美国模拟器件公司 | Variable attenuation system having continuous input steering |
| CN101051856A (en) * | 2007-01-30 | 2007-10-10 | 深圳国人通信有限公司 | Voltage control attenuator, method for realizing voltage control attenuator and application circuit |
| CN102195591A (en) * | 2011-04-02 | 2011-09-21 | 中国电子科技集团公司第二十四研究所 | Linear electrically controlled attenuator |
| CN104753483A (en) * | 2013-12-30 | 2015-07-01 | 国民技术股份有限公司 | Power amplifier and gain reduction circuit thereof |
| CN104362984A (en) * | 2014-11-18 | 2015-02-18 | 无锡科思电子科技有限公司 | High-accuracy TR (Transmitter and Receiver) assembly using simple LNA (Low Noise Amplifier) circuit |
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| 王文钦: "基于HMC346型压控衰减器的宽带压控衰减器设计", 《国外电子元器件 应用与设计》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113839626A (en) * | 2021-11-25 | 2021-12-24 | 广州慧智微电子股份有限公司 | Circuit and method for protecting amplifier |
| CN113839626B (en) * | 2021-11-25 | 2022-02-25 | 广州慧智微电子股份有限公司 | Circuit and method for protecting amplifier |
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| Publication number | Publication date |
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| CN106374850B (en) | 2019-05-07 |
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Effective date of registration: 20200123 Address after: 226200 Jiangsu city of Nantong province Qidong Economic Development Zone No. 666 Lin Yang Lu Co-patentee after: Nanjing Linyang Electric Power Technology Co.,Ltd. Patentee after: JIANGSU LINYANG ENERGY CO., LTD. Co-patentee after: Jiangsu Huayuan Apparatus and Instrument Co., Ltd. Address before: Qidong City, Jiangsu province 226200 Nantong City Lin Yang Lu No. 666 Co-patentee before: Nanjing Linyang Electric Power Technology Co.,Ltd. Patentee before: JIANGSU LINYANG ENERGY CO., LTD. |