CN104049126A - Current and voltage switching circuit - Google Patents
Current and voltage switching circuit Download PDFInfo
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- CN104049126A CN104049126A CN201310623462.4A CN201310623462A CN104049126A CN 104049126 A CN104049126 A CN 104049126A CN 201310623462 A CN201310623462 A CN 201310623462A CN 104049126 A CN104049126 A CN 104049126A
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- voltage
- current
- pnp triode
- sampling
- collector
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Abstract
The invention provides a current and voltage switching circuit. Through the voltage generated through a sampling input current signal, an output voltage which changes reversely and changes more rapidly relative to the voltage is generated. The base electrodes of two PNP triodes (Q1 and Q2) are connected. The collector electrodes of the two PNP triodes (Q1 and Q2) are connected with a bias current Ibias1 and a bias current Ibias2 respectively. The emitting electrode of the PNP triode Q1 is earthed through a sampling resistor. The emitting electrode of the PNP triode Q1 is connected with the sampling input current signal. The voltage of the collector electrode B of the PNP triode Q2 is used as an output voltage and is output to a follow-up comparator circuit. The sampling resistor is a metal layer in a chip.
Description
Technical field
The present invention relates to integrated circuit fields, the current-to-voltage converting circuit in special design Analogous Integrated Electronic Circuits.
Background technology
In integrated circuit, current/voltage is as the carrier of signal transmission, computing, control etc., often need to change they both.In some applications, Analogous Integrated Electronic Circuits needs sensed current signal.The electric current sampling after transforming voltage, resistance is directly inputed to follow-up comparer processing.
Mainly there is following defect in such scheme:
The current signal that sampling comes is very small and weak, and response speed is slow, and the voltage signal transforming through resistance also very weak comparer cannot be processed very little signal.In order to process such small-signal, conventionally optimize the performance of comparer, but the performance optimization of comparer is very difficult.
Summary of the invention
For solving the problem of above-mentioned existence, the invention provides a kind of new current-to-voltage converting circuit, realize signal response simple and that transform quick, the signal after conversion can offer common comparer practicality.
Solution of the present invention is as follows:
A kind of current-to-voltage converting circuit, the voltage (6) being produced by sampling input current signal generates one and becomes inverse change and pace of change output voltage (7) faster with described voltage (6);
Two PNP triode Q1(1) with Q2(2) base stage be connected, described two PNP triode Q1(1) and collector Q2(2) meet respectively bias current Ibias1(3) and Ibias2(4); Described PNP triode Q1(1) emitter by sampling resistor (5) receive ground; Described PNP triode Q1(1) emitter connect sampling input current signal (6); Described PNP triode Q2(2) voltage (7) of collector B exports to follow-up comparator circuit as output voltage; Described sampling resistor (5) is the metal level in chip.
The present invention has the following advantages:
1. circuit implementation is simple;
2. the response of the voltage signal after conversion fast.
Brief description of the drawings
Fig. 1 is schematic diagram of the present invention.
Embodiment
The current-to-voltage converting circuit cardinal principle that the present invention proposes is by the voltage being produced by sampling input current signal Isamp by circuit
generate one with
become inverse change and pace of change voltage faster
.As shown in Figure 1, the base stage of two PNP triode Q1, Q2 is connected, and the collector of Q1, Q2 meets respectively bias current Ibias1 and Ibias2.The emitter that the emitter A of Q1 receives ground and Q1 by sampling resistor Rs meets sampling input current signal Isamp.Conventionally sampling resistor Rs is used as resistance by the metal level in chip, and such resistance is low, power consumption is little, precision is high.The voltage of the collector B of Q2
export to follow-up comparator circuit as output voltage.The base stage of Q1 is connected with the collector of Q1.
As shown in Figure 1:
（1）
（2）
（3）
（4）
（5）
（6）
（7）
（8）
In (7) formula, due to
so,
can ignore,
That is:
（9）
From (9) formula, the voltage that sampling input current signal Isamp produces
with sampling input current signal Isamp linear dependence.
The course of work is as follows, sampling input current signal Isamp is converted into voltage VA by sampling resistor Rs, along with the increase of sample rate current, thereby A point potential rise C point current potential is along with rising, near current signal Isamp reaches cut-off current time, Q2 arrives cut-off state through magnifying state rapidly by cut-off state, and the voltage VB that exports to follow-up comparer reduces rapidly.Hence one can see that, the voltage signal of the linear change that adjustment current-to-voltage converting circuit generates sample rate current on RS converts the very fast voltage signal of pace of change to, exporting to common comparer can increase the reaction velocity of current-limiting circuit, improves the sensitivity of circuit.
Claims (3)
1. a current-to-voltage converting circuit, is characterized in that: the voltage (6) being produced by sampling input current signal generates one and becomes inverse change and pace of change output voltage (7) faster with described voltage (6).
2. current-to-voltage converting circuit according to claim 1, it is characterized in that: two PNP triode Q1(1) with Q2(2) base stage be connected, described two PNP triode Q1(1) and collector Q2(2) meet respectively bias current Ibias1(3) and Ibias2(4); Described PNP triode Q1(1) emitter by sampling resistor (5) receive ground; Described PNP triode Q1(1) emitter connect sampling input current signal (6); Described PNP triode Q2(2) voltage (7) of collector B exports to follow-up comparator circuit as output voltage.
3. current-to-voltage converting circuit according to claim 2, is characterized in that: described sampling resistor (5) is the metal level in chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310623462.4A CN104049126A (en) | 2013-12-01 | 2013-12-01 | Current and voltage switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310623462.4A CN104049126A (en) | 2013-12-01 | 2013-12-01 | Current and voltage switching circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104049126A true CN104049126A (en) | 2014-09-17 |
Family
ID=51502224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310623462.4A Pending CN104049126A (en) | 2013-12-01 | 2013-12-01 | Current and voltage switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104049126A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198783A (en) * | 2014-09-19 | 2014-12-10 | 杭州士兰微电子股份有限公司 | Power detection circuit with temperature compensation characteristic and powered device |
| CN110412342A (en) * | 2019-08-29 | 2019-11-05 | 成都矽能科技有限公司 | A kind of fast current detection circuit |
-
2013
- 2013-12-01 CN CN201310623462.4A patent/CN104049126A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104198783A (en) * | 2014-09-19 | 2014-12-10 | 杭州士兰微电子股份有限公司 | Power detection circuit with temperature compensation characteristic and powered device |
| CN104198783B (en) * | 2014-09-19 | 2017-08-25 | 杭州士兰微电子股份有限公司 | Power sense circuit and power receiving equipment with temperature compensation characteristic |
| CN110412342A (en) * | 2019-08-29 | 2019-11-05 | 成都矽能科技有限公司 | A kind of fast current detection circuit |
| CN110412342B (en) * | 2019-08-29 | 2024-01-26 | 成都矽能科技有限公司 | Quick current detection circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140917 |