CN204154856U - Triode amplifies test circuit - Google Patents
Triode amplifies test circuit Download PDFInfo
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- CN204154856U CN204154856U CN201420456254.XU CN201420456254U CN204154856U CN 204154856 U CN204154856 U CN 204154856U CN 201420456254 U CN201420456254 U CN 201420456254U CN 204154856 U CN204154856 U CN 204154856U
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- triode
- operational amplifier
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Abstract
A kind of triode amplifies test circuit, comprises test circuit and tested triode.Test circuit comprises voltage-controlled current source voltage generation circuit, voltage controlled current source circuit and triode measurement by magnification circuit.Described voltage-controlled current source voltage generation circuit and the electrical connection of voltage controlled current source circuit; Described tested triode is electrically connected between voltage controlled current source circuit and triode measurement by magnification circuit.Test circuit of the present utility model is simple, convenient, can interpretation go out the type of triode and calculate the enlargement factor of triode to be measured rapidly.
Description
Technical field
The utility model relates to a kind of test circuit of triode, particularly relates to a kind of triode and amplifies test circuit.
Background technology
The measurement of triode enlargement factor is a very important parameter in applications of electronic circuitry and engineering.For the measurement of this amplifying parameters, the method and system of existing many measurements.Wherein having with single-chip microcomputer is core, and devise dynatron performance parameters number measurement mechanism, the parameter that this device can be measured is more, is therefore often used to when measuring transistor parameter.But this device employs digital-control constant-flow source scheme in the enlargement factor measurement of triode.After adopting such scheme, there are the following problems: 1, iff being used for test triode enlargement factor, test macro is just comparatively complicated comparatively speaking.2, system input cost when setting up is too high.
Also having the more typical mode of one to be adopt circuit layout and hardware phase to compensate, by measuring the closed loop that polystage amplifier and measured device are formed jointly and the circuit oscillation produced, calculating the enlargement factor of triode.Also there is the problem of complex circuit designs in such metering system.
Utility model content
In order to the problem that the measurement scheme solving existing triode enlargement factor is comparatively complicated, the utility model adopts a kind of enlargement factor of test circuit to triode of easy triode to measure.
To achieve these goals: the technical solution adopted in the utility model is: a kind of triode amplifies test circuit, comprises test circuit and tested triode.Described test circuit comprises voltage-controlled current source voltage generation circuit, voltage controlled current source circuit and triode measurement by magnification circuit.Described voltage-controlled current source voltage generation circuit and the electrical connection of voltage controlled current source circuit; Described tested triode is electrically connected between voltage controlled current source circuit and triode measurement by magnification circuit.
Further, described voltage-controlled current source voltage generation circuit comprises adjustable potentiometer R1 and operational amplifier A 1.The two ends of described adjustable potentiometer R1 are electrically connected between on-load voltage source and ground; The adjustable end of adjustable potentiometer R1 is electrically connected with the positive input terminal of operational amplifier A 1; The negative input end of described operational amplifier A 1 is electrically connected with its output terminal.
Further, described voltage controlled current source circuit comprises resistance R2 and operational amplifier A 2.Described resistance R2 is electrically connected between the output terminal of operational amplifier A 1 and the negative input end of operational amplifier A 2.The negative input end of operational amplifier A 2 is electrically connected with the collector of tested triode, and the positive input terminal of operational amplifier A 2 is electrically connected with reference voltage source, and the output terminal of operational amplifier A 2 is connected with the transmitting current collection of tested triode.
Further, described triode enlargement factor metering circuit comprises operational amplifier A 3, resistance R3, resistance R4 and voltage table V.The negative input end of described operational amplifier A 3 is electrically connected with the base stage of tested triode.Described resistance R3 is electrically connected between the negative input end of operational amplifier A 3 and the output terminal of operational amplifier A 3.Described resistance R4 is electrically connected between operational amplifier A 3 and ground.Between the output terminal that described voltage table V is electrically connected on operational amplifier A 3 and ground.
After adopting the technical solution of the utility model, the positive input terminal of operational amplifier A 2 is connected with reference voltage source.Voltage table V measures the output voltage of triode enlargement factor metering circuit.According to the positive and negative values of voltage, judge that triode to be measured is NPN type triode or PNP type triode.Measure the numerical value of magnitude of voltage and reference voltage source according to voltage table, drawn the enlargement factor of triode by corresponding formula.Test circuit of the present utility model is simple, convenient, can interpretation go out the type of triode and calculate the enlargement factor of triode to be measured rapidly.
Accompanying drawing illustrates:
Fig. 1 triode amplifies the schematic block circuit diagram of test circuit.
Fig. 2 triode amplifies the circuit theory diagrams of test circuit.
Embodiment
Below in conjunction with accompanying drawing, the preferred scheme of the utility model is further elaborated:
As shown in Figure 1 and Figure 2, a kind of triode amplifies test circuit, comprises test circuit and tested triode.Described test circuit comprises voltage-controlled current source voltage generation circuit, voltage controlled current source circuit and triode measurement by magnification circuit.
Tested triode is the bipolar transistor T of enlargement factor β to be measured, and it has three terminals: collector c, transmitting collection e and base stage b.
Voltage-controlled current source voltage generation circuit comprises adjustable potentiometer R1 and operational amplifier A 1.The two ends of described adjustable potentiometer R1 are electrically connected between on-load voltage source and ground; The adjustable end of adjustable potentiometer R1 is electrically connected with the positive input terminal of operational amplifier A 1; The negative input end of described operational amplifier A 1 is electrically connected with its output terminal.
Voltage controlled current source circuit comprises resistance R2 and operational amplifier A 2.Described resistance R2 is electrically connected between the output terminal of operational amplifier A 1 and the negative input end of operational amplifier A 2.The negative input end of operational amplifier A 2 is electrically connected with the collector c of tested triode, and the positive input terminal of operational amplifier A 2 is electrically connected with reference voltage source, and the output terminal of operational amplifier A 2 is electrically connected with the transmitting collection e of tested triode.
Triode enlargement factor metering circuit comprises operational amplifier A 3, resistance R3, resistance R4 and voltage table V.The negative input end of described operational amplifier A 3 is electrically connected with the base stage b of tested triode.Described resistance R3 is electrically connected between the negative input end of operational amplifier A 3 and the output terminal of operational amplifier A 3.Described resistance R4 is electrically connected between operational amplifier A 3 and ground.Between the output terminal that described voltage table V is electrically connected on operational amplifier A 3 and ground, in order to measure the output voltage V of triode enlargement factor metering circuit
0
Illustrate how the enlargement factor of triode is calculated below.
From circuit analysis:
According to computing formula
then one group of parameter is selected to be specially: on-load voltage+V
cC=+12V, reference voltage Vref=+ 6V, R1=100K Ω, R2=1K Ω, R3=R4=10K Ω, operational amplifier A 1, A2, A3 all select OP07CP, as V
i=7V, then I
s=1mA, has i
f2=1/ β mA, due to V
0=R2*i
f2, the reading as voltage table V is 200mV, then have
this shows that the enlargement factor of triode is 50, and is NPN type triode.Reading as voltage table V is-200mV, and the enlargement factor of triode is also 50, but triode is positive-negative-positive.This shows, this metering circuit can be applicable to NPN and PNP type triode.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all within spirit of the present utility model and principle; any amendment done by those of ordinary skill in the art, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.
Claims (4)
1. triode amplifies a test circuit, comprises test circuit and tested triode; It is characterized in that: described test circuit comprises voltage-controlled current source voltage generation circuit, voltage controlled current source circuit and triode measurement by magnification circuit; Described voltage-controlled current source voltage generation circuit and the electrical connection of voltage controlled current source circuit; Described tested triode is electrically connected between voltage controlled current source circuit and triode measurement by magnification circuit.
2. triode according to claim 1 amplifies test circuit: it is characterized in that: described voltage-controlled current source voltage generation circuit comprises adjustable potentiometer R1 and operational amplifier A 1;
The two ends of described adjustable potentiometer R1 are electrically connected between on-load voltage source and ground; The adjustable end of adjustable potentiometer R1 is electrically connected with the positive input terminal of operational amplifier A 1;
The negative input end of described operational amplifier A 1 is electrically connected with its output terminal.
3. triode according to claim 1 amplifies test circuit: it is characterized in that: described voltage controlled current source circuit comprises resistance R2 and operational amplifier A 2;
Described resistance R2 is electrically connected between the output terminal of operational amplifier A 1 and the negative input end of operational amplifier A 2;
The negative input end of operational amplifier A 2 is electrically connected with the collector of tested triode; The positive input terminal of operational amplifier A 2 is electrically connected with reference voltage source; The output terminal of operational amplifier A 2 is connected with the transmitting current collection of tested triode.
4. triode according to claim 1 amplifies test circuit: it is characterized in that: described triode enlargement factor metering circuit comprises operational amplifier A 3, resistance R3, resistance R4 and voltage table V;
The negative input end of described operational amplifier A 3 is electrically connected with the base stage of tested triode;
Described resistance R3 is electrically connected between the negative input end of operational amplifier A 3 and the output terminal of operational amplifier A 3;
Described resistance R4 is electrically connected between operational amplifier A 3 and ground;
Between the output terminal that described voltage table V is electrically connected on operational amplifier A 3 and ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420456254.XU CN204154856U (en) | 2014-08-09 | 2014-08-09 | Triode amplifies test circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420456254.XU CN204154856U (en) | 2014-08-09 | 2014-08-09 | Triode amplifies test circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204154856U true CN204154856U (en) | 2015-02-11 |
Family
ID=52512958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420456254.XU Expired - Fee Related CN204154856U (en) | 2014-08-09 | 2014-08-09 | Triode amplifies test circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204154856U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308304A (en) * | 2020-03-02 | 2020-06-19 | 上海料聚微电子有限公司 | Circuit and method for detecting current amplification factor of bipolar transistor |
| CN113466652A (en) * | 2021-07-13 | 2021-10-01 | 苏州瀚宸科技有限公司 | On-chip detection method and system for triode parameters |
-
2014
- 2014-08-09 CN CN201420456254.XU patent/CN204154856U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308304A (en) * | 2020-03-02 | 2020-06-19 | 上海料聚微电子有限公司 | Circuit and method for detecting current amplification factor of bipolar transistor |
| CN111308304B (en) * | 2020-03-02 | 2022-06-28 | 上海料聚微电子有限公司 | Circuit and method for detecting current amplification factor of bipolar transistor |
| CN113466652A (en) * | 2021-07-13 | 2021-10-01 | 苏州瀚宸科技有限公司 | On-chip detection method and system for triode parameters |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150211 Termination date: 20150809 |
|
| EXPY | Termination of patent right or utility model |