CN207368988U - A kind of variable gain control circuit - Google Patents
A kind of variable gain control circuit Download PDFInfo
- Publication number
- CN207368988U CN207368988U CN201721705651.6U CN201721705651U CN207368988U CN 207368988 U CN207368988 U CN 207368988U CN 201721705651 U CN201721705651 U CN 201721705651U CN 207368988 U CN207368988 U CN 207368988U
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- circuit
- differential pair
- switch integrated
- integrated circuit
- constant
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Abstract
The utility model discloses a kind of variable gain control circuit, it includes the first differential pair circuit, the second differential pair circuit, first switch integrated circuit, second switch integrated circuit, the first constant-current source and the second constant-current source；Wherein, first switch integrated circuit and second switch integrated circuit connect multipair resistance respectively；And, the current negative feedback circuit of first constant-current source and the second constant-current source respectively with the first differential pair circuit and the second differential pair circuit is connected, and first switch integrated circuit and second switch integrated circuit are connected in parallel on the current negative feedback circuit of the first differential pair circuit and the second differential pair circuit respectively；One group of differential pulse signal inputs the input terminal to the first differential pair circuit and the second differential pair circuit, by switching the on off state of first switch integrated circuit and second switch integrated circuit, the gain of control the first differential pair circuit and the second differential pair circuit to differential pulse signal.Therefore, when the variable gain control circuit of the utility model is applied to pulse pattern generator, it is possible to increase the performance of pulse pattern generator.
Description
Technical field
Electronic circuit technology field is the utility model is related to, more particularly to a kind of variable gain control circuit.
Background technology
In the prior art, pulse pattern generator can not only produce simple pulse, burst and continuous impulse stream, its pattern energy
Power can also produce data-signal, and this multifunctionality is the key of digital device test application, therefore, pulse pattern generator
It is widely used in the testing fields such as radar, satellite navigation, electronic countermeasure, electronic communication and aerospace.And pulse pattern is sent out
The structure of raw device generally includes clock and produces part, memory and logical gate, signal shape control section.And in order to adapt to higher
Test request it is necessary to improve the performance of pulse pattern generator, then must be to each structure division in pulse pattern generator
Optimize.
Utility model content
The purpose of this utility model is that：A kind of variable gain control circuit for pulse pattern generator, energy are provided
Enough improve the performance of pulse pattern generator.
In order to realize above-mentioned purpose of utility model, the utility model provides following technical scheme：
A kind of variable gain control circuit, it includes the first differential pair circuit, the second differential pair circuit, first switch and integrates
Circuit, second switch integrated circuit, the first constant-current source and the second constant-current source；Wherein, first differential pair circuit and described
Two differential pair circuits have a current negative feedback circuit respectively, and the first switch integrated circuit and the second switch integrate
Circuit connects multipair resistance respectively；Also, first constant-current source and the current negative feedback circuit of first differential pair circuit
Connection, second constant-current source are connected with the current negative feedback circuit of second differential pair circuit, and the first switch integrates
Circuit and the second switch integrated circuit are connected in parallel on first differential pair circuit and second differential pair circuit respectively
On current negative feedback circuit；One group of differential pulse signal inputs first differential pair circuit and second differential pair circuit
Input terminal, by switching the on off state of the first switch integrated circuit and the second switch integrated circuit, described in control
The gain of first differential pair circuit and second differential pair circuit to the differential pulse signal.
According to a kind of specific embodiment, in the variable gain control circuit of the utility model, the first switch collection
It is identical with the logarithm of the resistance connected on the second switch integrated circuit into circuit, and with the resistance in a pair of of resistance
It is identical.
According to a kind of specific embodiment, in the variable gain control circuit of the utility model, the first switch collection
First differential pair circuit and institute are connected in parallel to by switching switch state change into circuit and the second switch integrated circuit
State the resistance of the current negative feedback circuit of the second differential pair circuit.
According to a kind of specific embodiment, in the variable gain control circuit of the utility model, first differential pair
Circuit and second differential pair circuit are made of two triodes respectively, and the current negative feedback circuit be connected to it is described
Between the emitter of two triodes of the first differential pair circuit and second differential pair circuit.
Compared with prior art, the beneficial effects of the utility model：
The variable gain control circuit of the utility model, it includes the first differential pair circuit, the second differential pair circuit, first
Switch integrated circuit, second switch integrated circuit, the first constant-current source and the second constant-current source；Wherein, the first differential pair circuit and
Two differential pair circuits have a current negative feedback circuit, first switch integrated circuit and second switch integrated circuit difference respectively
Connect multipair resistance；Also, the first constant-current source is connected with the current negative feedback circuit of the first differential pair circuit, the second constant-current source with
The current negative feedback circuit connection of second differential pair circuit, first switch integrated circuit and second switch integrated circuit are in parallel respectively
On the current negative feedback circuit of the first differential pair circuit and the second differential pair circuit；One group of differential pulse signal input first is poor
Point to the input terminal of circuit and the second differential pair circuit, by switching first switch integrated circuit and second switch integrated circuit
On off state, the gain of control the first differential pair circuit and the second differential pair circuit to differential pulse signal.Therefore, this practicality is new
When the variable gain control circuit of type is applied to pulse pattern generator, it is possible to increase the performance of pulse pattern generator.
Brief description of the drawings：
Fig. 1 is the structure diagram of the utility model；
Fig. 2 be the utility model include the first differential pair circuit, the second differential pair circuit, first switch integrated circuit
With the circuit diagram of second switch integrated circuit；
Fig. 3 and Fig. 4 is respectively the circuit diagram of the first constant-current source and the second constant-current source in the utility model.
Embodiment
The utility model is described in further detail with reference to test example and embodiment.But should not be by this
The scope for being interpreted as the above-mentioned theme of the utility model is only limitted to following embodiment, all to be realized based on the utility model content
Technology belongs to the scope of the utility model.
The structure diagram of the utility model as shown in Figure 1；Wherein, the variable gain control circuit of the utility model,
It includes the first differential pair circuit, the second differential pair circuit, first switch integrated circuit, second switch integrated circuit, the first perseverance
Stream source and the second constant-current source.
Wherein, first differential pair circuit and second differential pair circuit have a Current Negative Three-Point Capacitance electricity respectively
Road, the first switch integrated circuit and the second switch integrated circuit connect multipair resistance respectively；Also, described first is permanent
Stream source is connected with the current negative feedback circuit of first differential pair circuit, second constant-current source and second differential pair electricity
The current negative feedback circuit connection on road, the first switch integrated circuit and the second switch integrated circuit are connected in parallel on institute respectively
On the current negative feedback circuit for stating the first differential pair circuit and second differential pair circuit；One group of differential pulse signal inputs institute
The input terminal of the first differential pair circuit and second differential pair circuit is stated, by switching the first switch integrated circuit and institute
The on off state of second switch integrated circuit is stated, controls first differential pair circuit and second differential pair circuit to described
The gain of differential pulse signal.
Circuit diagram with reference to shown in Fig. 2；Wherein, on the first switch integrated circuit and the second switch integrated circuit
The logarithm of the resistance of connection is identical, and identical with the resistance in a pair of of resistance.The first switch integrated circuit and institute
State second switch integrated circuit and first differential pair circuit and second difference are connected in parallel to by switching switch state change
To the resistance of the current negative feedback circuit of circuit, and resistance is set to change within the specific limits.
Specifically, in the variable gain control circuit of the utility model, first differential pair circuit and described second poor
Be divided to and circuit be made of two triodes respectively, and the current negative feedback circuit be connected to first differential pair circuit and
Between the emitter of two triodes of second differential pair circuit.Meanwhile first that Fig. 3 and Fig. 4 is the utility model is permanent
Stream source and the circuit diagram of the second constant-current source.
Claims (4)
1. a kind of variable gain control circuit, it is characterised in that including the first differential pair circuit, the second differential pair circuit, first
Switch integrated circuit, second switch integrated circuit, the first constant-current source and the second constant-current source；Wherein, first differential pair circuit
There is a current negative feedback circuit, the first switch integrated circuit and described second respectively with second differential pair circuit
Switch integrated circuit connects multipair resistance respectively；Also, first constant-current source and the electric current of first differential pair circuit are born
Feedback circuit connects, and second constant-current source is connected with the current negative feedback circuit of second differential pair circuit, and described first
Switch integrated circuit and the second switch integrated circuit are connected in parallel on first differential pair circuit and second difference respectively
To on the current negative feedback circuit of circuit；One group of differential pulse signal inputs first differential pair circuit and second difference
To the input terminal of circuit, by switching the on off state of the first switch integrated circuit and the second switch integrated circuit,
Control the gain of first differential pair circuit and second differential pair circuit to the differential pulse signal.
2. variable gain control circuit as claimed in claim 1, it is characterised in that the first switch integrated circuit and described
The logarithm of the resistance connected on second switch integrated circuit is identical, and identical with the resistance in a pair of of resistance.
3. variable gain control circuit as claimed in claim 2, it is characterised in that the first switch integrated circuit and described
Second switch integrated circuit is connected in parallel to first differential pair circuit and second differential pair by switching switch state change
The resistance of the current negative feedback circuit of circuit.
4. variable gain control circuit as claimed in claim 1, it is characterised in that first differential pair circuit and described
Two differential pair circuits are made of two triodes respectively, and the current negative feedback circuit is connected to the first differential pair electricity
Between the emitter of two triodes of road and second differential pair circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721705651.6U CN207368988U (en) | 2017-12-08 | 2017-12-08 | A kind of variable gain control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721705651.6U CN207368988U (en) | 2017-12-08 | 2017-12-08 | A kind of variable gain control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207368988U true CN207368988U (en) | 2018-05-15 |
Family
ID=62344213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721705651.6U Active CN207368988U (en) | 2017-12-08 | 2017-12-08 | A kind of variable gain control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207368988U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800394A (en) * | 2017-12-08 | 2018-03-13 | 成都前锋电子仪器有限责任公司 | A kind of variable gain control circuit |
-
2017
- 2017-12-08 CN CN201721705651.6U patent/CN207368988U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107800394A (en) * | 2017-12-08 | 2018-03-13 | 成都前锋电子仪器有限责任公司 | A kind of variable gain control circuit |
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