CN106936395A - Linear voltage-controlled amplifier - Google Patents
Linear voltage-controlled amplifier Download PDFInfo
- Publication number
- CN106936395A CN106936395A CN201710118756.XA CN201710118756A CN106936395A CN 106936395 A CN106936395 A CN 106936395A CN 201710118756 A CN201710118756 A CN 201710118756A CN 106936395 A CN106936395 A CN 106936395A
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- Prior art keywords
- amplifier
- linear
- resistance
- voltage
- triode
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
Abstract
A kind of linear voltage-controlled amplifier, including：Difference amplifier and linear voltage control electric current source, the difference amplifier is connected with linear voltage control electric current source, the multiplication factor of the difference amplifier receives its three ports for control, 3rd end of the difference amplifier is connected with the output end in linear voltage control electric current source, the first end of the difference amplifier is connected with external input signal, and the second end is connected with posterior member；The input in the linear voltage control electric current source is connected with external voltage control signal, for the voltage control signal of input to be converted into output current, the output current is linear with the voltage control signal of input, and the output end in the linear voltage control electric current source is connected with the 3rd end of difference amplifier；Multiplication factor Av=K × the VCON of the difference amplifier, wherein K are constant.Above-mentioned linear voltage-controlled amplifier can realize Linear/Linear control characteristic.
Description
Technical field
The invention belongs to a kind of voltage-controlled amplifier, and in particular to a kind of linear voltage-controlled amplifier.
Background technology
Voltage-controlled amplifier in analog circuit using widely, but current voltage-controlled amplifier be generally it is linear/to numerical control
Characteristic processed, i.e. V/dB characteristics, but need Linear/Linear control characteristic in some applications, i.e. V/ multiplication factors characteristic.
The content of the invention
For the judgement defeat technique problem of frequency present in prior art, the present invention provides a kind of new linear voltage-controlled
Amplifier.
A kind of linear voltage-controlled amplifier provided by the present invention, including：Difference amplifier and linear voltage control electric current source,
The difference amplifier is connected with linear voltage control electric current source, and the multiplication factor of the difference amplifier is controlled by its 3rd end
System, the 3rd end of the difference amplifier is connected with the output end in linear voltage control electric current source, and the of the difference amplifier
One end is connected with external input signal, and the second end is connected with posterior member；The input in the linear voltage control electric current source with
External voltage control signal is connected, for the voltage control signal of input to be converted into output current, the output current with it is defeated
The voltage control signal for entering is linear, the output end in the linear voltage control electric current source and the 3rd end of difference amplifier
It is connected；Multiplication factor Av=K × the VCON of the difference amplifier, wherein K are constant.
Wherein, the difference amplifier includes first and second triode, the first to the 7th resistance, the first to the 5th electricity
Hold, one end of second electric capacity is connected as the first end of whole difference amplifier with external input signal, second electricity
The other end of appearance is connected with the base stage of the first triode, and the colelctor electrode of first triode also passes sequentially through first resistor and
Seven resistance are connected with its base stage, and the emitter stage of first triode is connected with the emitter stage of the second triode, and the described 2nd 3
The colelctor electrode of pole pipe is connected by 3rd resistor with external power source, the colelctor electrode of second triode also directly with the first electric capacity
One end be connected, the other end of first electric capacity is connected as the second end of whole difference amplifier with posterior member, described
Node between first resistor and the colelctor electrode of the first triode is directly connected with external power source, the external power source and the 3rd electricity
Node between resistance also passes sequentially through the 4th and the 5th resistance eutral grounding, and the 5th resistance is connected in parallel with the 3rd electric capacity, described
Node between 4th and the 5th resistance is connected with the base stage of the second triode, and the emitter stage of first and second triode is also
It is grounded after passing sequentially through the 6th resistance and the 4th electric capacity jointly, the node between the 6th resistance and the 4th electric capacity is used as whole
3rd end of difference amplifier is connected with the linear voltage control electric current source, the section between the first resistor and the 7th resistance
Point is grounded by second resistance, and the second resistance is connected in parallel with the 5th electric capacity.
Wherein, the linear voltage control electric current source includes operational amplifier, the 3rd triode, the 8th and the 9th resistance,
The normal phase input end of the operational amplifier is connected as the first end in whole linear voltage control electric current source with controlled voltage, instead
, by the 8th resistance eutral grounding, the normal phase input end of the operational amplifier is also directly by the 9th resistance eutral grounding, institute for phase input
The output end for stating operational amplifier is connected with the base stage of the 3rd triode, and the emitter stage of the 3rd triode is directly anti-phase with it
Input is connected, and colelctor electrode is connected as second end in whole linear voltage control electric current source with the 3rd end of difference amplifier 1.
Wherein, the colelctor electrode of the 3rd triode is connected to the node between the 6th resistance and the 4th electric capacity.
Wherein, the multiplication factor Av of the difference amplifier is：Wherein R7 represents the resistance value of 3rd resistor R7, and ITAIL represents line
The output current value of property voltage-controlled amplifier.
Wherein, the output current ITAIL of the linear voltage-controlled amplifier is：Wherein VCON is represented and received
The magnitude of voltage of voltage is controlled, R6 represents the resistance value of the 8th resistance.
Wherein, the multiplication factor Av of the difference amplifier is：Av=K × VCON, wherein
Wherein, the described first to the 3rd triode is NPN pipes, and its cut-off frequency fT requirements are more than 2GHz.
Wherein, the operational amplifier is single-voltage-supply cmos operational amplifier.
Wherein, the operational amplifier is voltage feedback operational amplifier.
Under the conditions of being -55 DEG C~125 DEG C in operating temperature, a kind of work electricity of linear voltage-controlled amplifier of the present invention
Working properly when pressure is more than more than 3V, temperature stability is good, and its bandwidth of operation is up to 700MHz.In addition, the linear pressure
The component that control amplifier is used is few, small volume, low cost, and the voltage-controlled amplifier can also be integrated using IC, further
Reduce volume.Meanwhile, voltage-controlled amplifier of the invention need not be debugged, and be easy to produce in enormous quantities.
Brief description of the drawings
Fig. 1 is a kind of block diagram of the better embodiment of linear voltage-controlled amplifier of the present invention.
Fig. 2 is a kind of circuit diagram of the better embodiment of linear voltage-controlled amplifier of the present invention.
Fig. 3 is a kind of measured result control characteristic figure of the better embodiment of linear voltage-controlled amplifier of the present invention.
Fig. 4 is a kind of frequency characteristic figure of the better embodiment of linear voltage-controlled amplifier of the present invention.
In figure, 1：Difference amplifier；2：Linear voltage control electric current source；R2、R3、R6-R12：Resistance；C1-C5：Electric capacity；
Q2-Q4：Triode；U1：Operational amplifier.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention is realized are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Company ", " connection " should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can
Being to mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, Ke Yishi
Two connections of element internal.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Refer to shown in Fig. 1, be a kind of block diagram of the better embodiment of linear voltage-controlled amplifier of the present invention.The line
Property voltage-controlled amplifier better embodiment include difference amplifier 1 and linear voltage control electric current source 2, the difference amplifier
1 is connected with linear voltage control electric current source 2.
The multiplication factor of the difference amplifier 1 is by its 3rd end ITAIL controls, the 3rd end and linear voltage control electric current
The output end ICON in source 2 is connected, when the 3rd end ITAIL received signals of the difference amplifier 1 increase, the difference
The multiplication factor increase of amplifier 1, when the 3rd end ITAIL received signals are reduced, the times magnification of the difference amplifier 1
Number is reduced.The first end (input) of the difference amplifier 1 is connected with external input signal VIN, the second end (output end) with
Posterior member is connected, and its 3rd end is connected with the output end ICON in linear voltage control electric current source 2.
The linear voltage control electric current source 2 is used to for the voltage control signal VCON of input to be converted into output current
ICON, the output current ICON are linear with the voltage control signal VCON of input.The linear voltage control electric current
The input in source 2 is connected with external voltage control signal VCON, the 3rd end ITAIL of its output end ICON and difference amplifier 1
It is connected.
Please continue to refer to the circuit diagram of the better embodiment for shown in Fig. 2, being linear voltage-controlled amplifier in Fig. 1.The difference
Dividing amplifier 1 includes that triode Q3, Q4, resistance R2, R3, R7-R9, R11, R12, one end of electric capacity C1-C5, the electric capacity C2 are made
For the first end of whole difference amplifier 1 is connected with external input signal VIN, the other end of the electric capacity C2 is with triode Q3's
Base stage is connected, and the colelctor electrode of the triode Q3 also passes sequentially through resistance R2 and R12 and is connected with its base stage, the triode Q3's
Emitter stage is connected with the emitter stage of triode Q4, and the colelctor electrode of the triode Q4 is connected by resistance R7 with external power source VCC,
The one end of the colelctor electrode of the triode Q4 also directly with electric capacity C1 is connected, and the other end of the electric capacity C1 is put as whole difference
Second end of big device 1 is connected with posterior member.
Node between the resistance R2 and the colelctor electrode of triode Q3 is directly connected with external power source VCC, the outside
Node between power supply VCC and resistance R7 also passes sequentially through resistance R8 and R9 ground connection, and the resistance R9 and electric capacity C3 is connected in parallel.
Node between the resistance R8 and R9 is connected with the base stage of triode Q4, the emitter stage of the triode Q3 and Q4 also jointly according to
It is secondary by after resistance R11 and electric capacity C4 be grounded, the node between the resistance R11 and electric capacity C4 is used as whole difference amplifier 1
The 3rd end be connected with the linear voltage control electric current source 2.Node between the resistance R2 and resistance R12 passes through resistance R3
Ground connection, the resistance R3 and electric capacity C5 is connected in parallel.
The linear voltage control electric current source 2 includes operational amplifier U1, triode Q2, resistance R6 and R10.The computing
The normal phase input end of amplifier U1 is connected as the first end in whole linear voltage control electric current source 2 with controlled voltage VCON, instead
Phase input is grounded by resistance R6.The normal phase input end of the operational amplifier U1 is also directly grounded by resistance R10.It is described
The output end of operational amplifier U1 is connected with the base stage of triode Q2, the emitter stage of the triode Q2 directly with its anti-phase input
End is connected, and colelctor electrode is connected as second end in whole linear voltage control electric current source 2 with the 3rd end of difference amplifier 1, tool
Body, the colelctor electrode of the triode Q2 is connected to the node between resistance R11 and electric capacity C4.
The operation principle of above-mentioned linear voltage-controlled amplifier will be illustrated below：
The multiplication factor of the difference amplifier 1 is controlled by its 3rd end (i.e. control end), and its operation principle is as follows：When
When external load (referring to the posterior member connected with the second end of difference amplifier 1) is equal with the resistance value of resistance R7, for example,
During 51 Ω, the multiplication factor Av of the difference amplifier 1 is as follows：
Wherein R7 represents the resistance value of resistance R7；
The output current ITAIL of the linear voltage-controlled amplifier is as follows：
Wherein VCON represents the magnitude of voltage of controlled voltage；
Therefore the multiplication factor Av of the difference amplifier 1 is as follows：
In present embodiment, K is constant：(also may be configured as other in other embodiment
Value).
To sum up, the multiplication factor of the difference amplifier 1 is linear with controlled voltage VCON, realizes linear/line
Property control characteristic.
In present embodiment, the electric capacity C1-C5 is conventional conventional capacitive, and its capacitance can be set to 0.1uF.
Described resistance R2, R3, R6, R7, R8, R9, R10, R11, R12 are conventional conventional, electric-resistance, wherein, the resistance R2
Resistance value for 5.1k Ω, the resistance R3 resistance value for 7.5k Ω, the resistance R8 resistance value be 5.1k Ω, the electricity
The resistance value of R9 is hindered for the resistance value of 7.5k Ω, the resistance R12 is 51 Ω, and the resistance value of the resistance R7 is 51 Ω, described
The resistance value of resistance R11 is 100 Ω, and the resistance value of the resistance R6 is 100 Ω, and the resistance value of the resistance R10 is 1K Ω.
Described triode Q2, Q3 and Q4 are conventional common NPN pipes, and its cut-off frequency fT requirements are more than 2GHz.The fortune
It is conventional single-voltage-supply cmos operational amplifier to calculate amplifier U1, and it is voltage feedback operational amplifier.
Please continue to refer to shown in Fig. 3 and Fig. 4, wherein Fig. 3 is a kind of measured result control of linear voltage-controlled amplifier of the present invention
Performance plot processed, Fig. 4 is a kind of frequency characteristic figure of the better embodiment of linear voltage-controlled amplifier of the present invention.In operating temperature
Under the conditions of for -55 DEG C~125 DEG C, equal work when a kind of operating voltage of linear voltage-controlled amplifier of the present invention is more than more than 3V
Make normal, temperature stability is good, and its bandwidth of operation is up to 700MHz.
The component that a kind of linear voltage-controlled amplifier of the present invention is used is few, small volume, low cost, and this is voltage-controlled
Amplifier can also be integrated using IC, further reduces volume.Meanwhile, voltage-controlled amplifier of the invention need not be debugged, and be easy to
Produce in enormous quantities.
Embodiments of the present invention are these are only, the scope of the claims of the invention is not thereby limited, it is every using the present invention
The equivalent structure that specification and accompanying drawing content are made, is directly or indirectly used in other related technical fields, similarly at this
Within the scope of patent protection of invention.
Claims (10)
1. a kind of linear voltage-controlled amplifier, including：Difference amplifier and linear voltage control electric current source, the difference amplifier with
Linear voltage control electric current source is connected, and the multiplication factor of the difference amplifier receives its three ports for control, the difference amplifier
The 3rd end be connected with the output end in linear voltage control electric current source, the first end and external input signal of the difference amplifier
It is connected, the second end is connected with posterior member；The input in the linear voltage control electric current source and external voltage control signal phase
Even, for the voltage control signal of input to be converted into output current, the voltage control signal of the output current and input into
Linear relationship, the output end in the linear voltage control electric current source is connected with the 3rd end of difference amplifier；The differential amplification
Multiplication factor Av=K × the VCON of device, wherein K are constant.
2. voltage-controlled amplifier as claimed in claim 1 linear, it is characterised in that：The difference amplifier includes first and second
Triode, the first to the 7th resistance, the first to the 5th electric capacity, one end of second electric capacity is used as the of whole difference amplifier
One end is connected with external input signal, and the other end of second electric capacity is connected with the base stage of the first triode, and the described 1st
The colelctor electrode of pole pipe also passes sequentially through first resistor and the 7th resistance is connected with its base stage, the emitter stage of first triode with
The emitter stage of the second triode is connected, and the colelctor electrode of second triode is connected by 3rd resistor with external power source, described
The one end of the colelctor electrode of the second triode also directly with the first electric capacity is connected, and the other end of first electric capacity is used as whole difference
Second end of amplifier is connected with posterior member, the node between the colelctor electrode of the first resistor and the first triode directly with
External power source is connected, and the node between the external power source and 3rd resistor also passes sequentially through the 4th and the 5th resistance eutral grounding, institute
State the 5th resistance to be connected in parallel with the 3rd electric capacity, the base stage phase of the node between the 4th and the 5th resistance and the second triode
Even, the emitter stage of first and second triode is grounded after also passing sequentially through the 6th resistance and the 4th electric capacity jointly, and described the
Node between six resistance and the 4th electric capacity as whole difference amplifier the 3rd end and the linear voltage control electric current source
It is connected, the node between the first resistor and the 7th resistance is by second resistance ground connection, the second resistance and the 5th electric capacity
It is connected in parallel.
3. voltage-controlled amplifier as claimed in claim 2 linear, it is characterised in that：The linear voltage control electric current source includes fortune
Amplifier, the 3rd triode, the 8th and the 9th resistance are calculated, the normal phase input end of the operational amplifier is used as whole linear voltage
The first end in control electric current source is connected with controlled voltage, and inverting input passes through the 8th resistance eutral grounding, the operational amplifier
Normal phase input end also directly by the 9th resistance eutral grounding, the base stage phase of the output end of the operational amplifier and the 3rd triode
Even, the emitter stage of the 3rd triode is directly connected with its inverting input, and colelctor electrode controls electricity as whole linear voltage
Second end in stream source is connected with the 3rd end of difference amplifier 1.
4. voltage-controlled amplifier as claimed in claim 3 linear, it is characterised in that：The colelctor electrode of the 3rd triode is connected to
Node between 6th resistance and the 4th electric capacity.
5. linear voltage-controlled amplifier as claimed in claim 3, it is characterised in that：The multiplication factor Av of the difference amplifier is：Wherein R7 represents the resistance value of 3rd resistor R7, and ITAIL represents line
The output current value of property voltage-controlled amplifier.
6. voltage-controlled amplifier as claimed in claim 5 linear, it is characterised in that：The output current of the linear voltage-controlled amplifier
ITAIL is：Wherein VCON represents the magnitude of voltage of controlled voltage, and R6 represents the resistance value of the 8th resistance.
7. voltage-controlled amplifier as claimed in claim 6 linear, it is characterised in that：The multiplication factor Av of the difference amplifier
For：Av=K × VCON, wherein
8. voltage-controlled amplifier as claimed in claim 3 linear, it is characterised in that：Described first to the 3rd triode is NPN
Pipe, its cut-off frequency fT requirements are more than 2GHz.
9. voltage-controlled amplifier as claimed in claim 3 linear, it is characterised in that：The operational amplifier is transported for single-voltage-supply cmos
Calculate amplifier.
10. voltage-controlled amplifier as claimed in claim 9 linear, it is characterised in that：The operational amplifier is voltage feedback type
Operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710118756.XA CN106936395B (en) | 2017-03-01 | 2017-03-01 | Linear voltage controlled amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710118756.XA CN106936395B (en) | 2017-03-01 | 2017-03-01 | Linear voltage controlled amplifier |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106936395A true CN106936395A (en) | 2017-07-07 |
| CN106936395B CN106936395B (en) | 2020-02-07 |
Family
ID=59424700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710118756.XA Active CN106936395B (en) | 2017-03-01 | 2017-03-01 | Linear voltage controlled amplifier |
Country Status (1)
| Country | Link |
|---|---|
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4163950A (en) * | 1978-03-01 | 1979-08-07 | Tektronix, Inc. | Isolating differential amplifier |
| CN101242162A (en) * | 2007-02-08 | 2008-08-13 | 联发科技（新加坡）私人有限公司 | Variable gain amplifying circuit |
| CN102104367A (en) * | 2011-03-04 | 2011-06-22 | 中兴通讯股份有限公司 | Variable gain amplifier (VGA) |
| CN103928842A (en) * | 2014-04-23 | 2014-07-16 | 福建一丁芯光通信科技有限公司 | High-speed laser diode driver integrated circuit adopting negative capacitance neutralizing technology |
-
2017
- 2017-03-01 CN CN201710118756.XA patent/CN106936395B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4163950A (en) * | 1978-03-01 | 1979-08-07 | Tektronix, Inc. | Isolating differential amplifier |
| CN101242162A (en) * | 2007-02-08 | 2008-08-13 | 联发科技（新加坡）私人有限公司 | Variable gain amplifying circuit |
| CN102104367A (en) * | 2011-03-04 | 2011-06-22 | 中兴通讯股份有限公司 | Variable gain amplifier (VGA) |
| CN103928842A (en) * | 2014-04-23 | 2014-07-16 | 福建一丁芯光通信科技有限公司 | High-speed laser diode driver integrated circuit adopting negative capacitance neutralizing technology |
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| Publication number | Publication date |
|---|---|
| CN106936395B (en) | 2020-02-07 |
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