CN206835056U - A kind of collection amplifying circuit based on APD - Google Patents
A kind of collection amplifying circuit based on APD Download PDFInfo
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- CN206835056U CN206835056U CN201720535339.0U CN201720535339U CN206835056U CN 206835056 U CN206835056 U CN 206835056U CN 201720535339 U CN201720535339 U CN 201720535339U CN 206835056 U CN206835056 U CN 206835056U
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- amplifier
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Abstract
The utility model discloses a kind of collection amplifying circuit based on APD, it includes APD, the trans-impedance amplifier of the first order, the inverting amplifier of the second level, first resistor, second resistance, 3rd resistor, the first electric capacity, the second electric capacity and the 3rd electric capacity, APD negative electrodes connect positive bias voltage, anode connects trans-impedance amplifier input, and trans-impedance amplifier exports the voltage opposite with input signal；Rear class adds an anti-phase input amplifier, anti-phase amplification prime output signal so that the voltage of this one-level output is identical with prime input signal.An electric capacity, isolated DC signal, influence of the input offset voltage that can be good at isolating previous stage amplifier to signal are connected between the first order and the second level simultaneously.It has the following advantages that：Multiplication factor is big, with wide.
Description
Technical field
It the utility model is related to a kind of collection amplifying circuit based on APD.
Background technology
Avalanche photodide (APD) can have at a relatively high quantum efficiency in very big spectral region, to incident intensity
The linear response dynamic range of degree is high.Compared with photodiode (PD), it can detect lower light because of avalanche effect, and
Possess broader bandwidth.APD is in demodulation device of the sensory field of optic fibre as fiber-optic signal, using universal.Existing collection amplification
Circuit has been short of in bandwidth, and the detection for some high speed signals has limitation.
Utility model content
The utility model provides a kind of collection amplifying circuit based on APD, which overcomes showing described in background technology
There is the deficiency of technology.
Technical scheme is used by the utility model solves its technical problem：
A kind of collection amplifying circuit based on APD, it puts including APD, the trans-impedance amplifier of the first order, the anti-phase of the second level
Big device, first resistor, second resistance, 3rd resistor, the first electric capacity, the second electric capacity and the 3rd electric capacity, the negative electrode connection of the APD is just
Voltage bias, the negative electrode of the APD are connected with the negative input end of trans-impedance amplifier, the both ends difference of the first resistor and the first electric capacity
It is connected with the negative input end and output end of trans-impedance amplifier, the positive input terminal ground connection of the trans-impedance amplifier, the trans-impedance amplifier
Positive and negative power end is powered by positive supply and negative supply respectively, the negative input end of the inverting amplifier and one end phase of second resistance
Even, the both ends of second electric capacity are connected with the output end of trans-impedance amplifier and the other end of second resistance respectively, the 3rd resistor
It is connected respectively with the negative input end of inverting amplifier with output end with the both ends of the 3rd electric capacity, the positive input terminal of the inverting amplifier
Ground connection, the positive and negative power end of the inverting amplifier are powered by positive supply and negative supply respectively.
Among one embodiment：Also include the 4th resistance, the output end of one end connection inverting amplifier of the 4th resistance.
Among one embodiment：The gain bandwidth product of the trans-impedance amplifier and inverting amplifier is in more than 1.6GHz.
Compared with background technology, it has the following advantages that the technical program：
1st, circuit uses positive bias using positive-negative power power supply, APD, and positive high pressure is easier to obtain on circuit.
2nd, using electric capacity blocking so that DC component caused by previous stage amplifying circuit does not interfere with the amplification of rear stage.
3rd, multiplication factor is big, and bandwidth is wider, and cascade amplifier can also ensure that bandwidth will not again after inverting amplifier
There is big reduction.
Brief description of the drawings
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is a kind of collection amplifying circuit based on APD described in the present embodiment
Embodiment
It refer to Fig. 1, a kind of collection amplifying circuit based on APD, it includes APD, the trans-impedance amplifier U1 of the first order, the
The inverting amplifier U2 of two level, first resistor R1, second resistance R2,3rd resistor R3, the first electric capacity C1, the second electric capacity C2 and
Three electric capacity C3, APD negative electrode connection positive bias voltage, the negative electrode of the APD are connected with trans-impedance amplifier U1 negative input end, should
Negative input end and output end of first resistor R1 and the first electric capacity C1 both ends respectively with trans-impedance amplifier U1 are connected, and should be put across resistance
Big device U1 positive input terminal ground connection, trans-impedance amplifier U1 positive and negative power end are powered by positive supply and negative supply respectively, and this is anti-
Phase amplifier U2 negative input end is connected with second resistance R2 one end, second electric capacity C2 both ends respectively with trans-impedance amplifier
U1 output end is connected with the second resistance R2 other end, and 3rd resistor R3 and the 3rd electric capacity C3 both ends are put with anti-phase respectively
Big device U2 negative input end is connected with output end, and inverting amplifier U2 positive input terminal is grounded, inverting amplifier U2 just,
Negative power end is powered by positive supply and negative supply respectively.
In the present embodiment, include the 4th resistance R4, the 4th resistance R4 one end connection inverting amplifier U2 output
End.
Preferably, the gain bandwidth product of the trans-impedance amplifier U1 and inverting amplifier U2 are in more than 1.6GHz.
APD negative electrodes connect positive bias voltage, and anode connects trans-impedance amplifier U1 inputs, trans-impedance amplifier U1 outputs and input signal
Opposite voltage；Rear class adds an anti-phase input amplifier U2, anti-phase amplification prime output signal so that the electricity of this one-level output
Pressure is identical with prime input signal.An electric capacity is connected between the first order and the second level simultaneously, isolated DC signal can be very
Influence of the input offset voltage of good isolation previous stage amplifier to signal.
The first resistor R1 is across resistance, and its resistance size determines trans-impedance amplifier U1 gain, and the first electric capacity C1's deposits
Being in order to suppress to shake；Whole trans-impedance amplifier U1 bandwidth is by first resistor R1, the first electric capacity C1 value, trans-impedance amplifier
U1 gain bandwidth product and APD capacitance determine.Second resistance R2 and 3rd resistor R3 determines inverting amplifier U2's
Gain, 3rd resistor R3 and the 3rd electric capacity C3 and inverting amplifier U2 gain bandwidth product determine inverting amplifier U2 band
It is wide.
, can also Cascaded amplification again behind the collection amplifying circuit described in the present embodiment in order to obtain bigger multiplication factor
Device, its bandwidth do not have obvious reduction.
It is described above, only the utility model preferred embodiment, therefore the utility model implementation can not be limited according to this
Scope, i.e., the equivalent changes and modifications made according to the utility model patent scope and description, it is new all should still to belong to this practicality
In the range of type covers.
Claims (3)
- A kind of 1. collection amplifying circuit based on APD, it is characterised in that：Including APD, the trans-impedance amplifier of the first order, the second level Inverting amplifier, first resistor, second resistance, 3rd resistor, the first electric capacity, the second electric capacity and the 3rd electric capacity, the moon of the APD Pole connects positive bias voltage, and the anode of the APD is connected with the negative input end of trans-impedance amplifier, the first resistor and the first electric capacity Both ends are connected with the negative input end and output end of trans-impedance amplifier respectively, the positive input terminal ground connection of the trans-impedance amplifier, should be across resistance The positive and negative power end of amplifier is powered by positive supply and negative supply respectively, the negative input end and second resistance of the inverting amplifier One end be connected, the both ends of second electric capacity are connected with the output end of trans-impedance amplifier and the other end of second resistance respectively, should 3rd resistor is connected with the negative input end of inverting amplifier with output end respectively with the both ends of the 3rd electric capacity, the inverting amplifier Positive input terminal is grounded, and the positive and negative power end of the inverting amplifier is powered by positive supply and negative supply respectively.
- A kind of 2. collection amplifying circuit based on APD according to claim 1, it is characterised in that：Also include the 4th resistance, The output end of one end connection inverting amplifier of 4th resistance.
- A kind of 3. collection amplifying circuit based on APD according to claim 1, it is characterised in that：The trans-impedance amplifier Gain bandwidth product with inverting amplifier is in more than 1.6GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720535339.0U CN206835056U (en) | 2017-05-15 | 2017-05-15 | A kind of collection amplifying circuit based on APD |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720535339.0U CN206835056U (en) | 2017-05-15 | 2017-05-15 | A kind of collection amplifying circuit based on APD |
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| CN206835056U true CN206835056U (en) | 2018-01-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720535339.0U Active CN206835056U (en) | 2017-05-15 | 2017-05-15 | A kind of collection amplifying circuit based on APD |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031245A (en) * | 2018-08-21 | 2018-12-18 | 南京华讯方舟通信设备有限公司 | 4 quadrant detector signal amplification circuit for laser radar |
| CN109639343A (en) * | 2018-12-06 | 2019-04-16 | 安徽华东光电技术研究所有限公司 | A kind of modular optical photo-detector arrangement |
-
2017
- 2017-05-15 CN CN201720535339.0U patent/CN206835056U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109031245A (en) * | 2018-08-21 | 2018-12-18 | 南京华讯方舟通信设备有限公司 | 4 quadrant detector signal amplification circuit for laser radar |
| CN109639343A (en) * | 2018-12-06 | 2019-04-16 | 安徽华东光电技术研究所有限公司 | A kind of modular optical photo-detector arrangement |
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