Trans-impedance amplifier with low noise and high gain-bandwidth product

A technology of transimpedance amplifiers and amplifiers, applied in amplifiers with only semiconductor devices, amplifiers controlled by light, and improving amplifiers to reduce noise effects, etc. Open-loop characteristics and other issues to achieve the effect of reducing contribution, ensuring stability, and increasing signal bandwidth

Active Publication Date: 2009-08-12
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] The above analysis shows that the existing TIA cannot simultaneously eliminate C PIN 、C f 、C in 、C p and other capacitances to the TIA time constant τ SIG The impact of the amplifier, so that the open-loop characteristics of the amplifier cannot be fully utilized, and a larger resistance value R cannot be used f To improve the noise performance of TIA, we should further seek solutions to eliminate the influence of various capacitors on the time constant of TIA

Method used

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  • Trans-impedance amplifier with low noise and high gain-bandwidth product
  • Trans-impedance amplifier with low noise and high gain-bandwidth product
  • Trans-impedance amplifier with low noise and high gain-bandwidth product

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Embodiment 1

[0065] Figure 6 It is a schematic diagram (a) of the structure of the transimpedance amplifier TIA according to embodiment 1 of the present invention and an implementation of the schematic diagram (b) of its equivalent circuit. In the figure, PIN is a photoelectric converter that converts optical signals into current signals, A 1 is the main amplifier, A 2 are auxiliary amplifiers, and their open-loop gains are also denoted as A 1 、A 2 , and satisfy the condition:

[0066] A 1 >>1,A 2 1 ·A 2 =A ff >1;

[0067] Buffer is a buffer with a voltage gain of 1, which is not an indispensable part of this embodiment; R' in is the PIN shunt resistor R sh with the amplifier input resistor R in Equivalent resistance in parallel, C T is the total input capacitance of the TIA (including the PIN shunt capacitance C PIN , Amplifier input capacitance C in , amplifier input wiring capacitance and other parasitic capacitance C p etc.); R f is connection A 1 Output N to A 1 Neg...

Embodiment 2

[0104] Embodiment 2 of the present invention sees Figure 9 , PIN, A in the picture 1 、A 2 , Buffer, C T , R' in , R f 、C ff The definition of is the same as in Embodiment 1, C f is greater than R f The fixed capacitance of the parasitic capacitance can make the equivalent input capacitance of the TIA C ∑ will not be caused by R f The parasitic capacitance is unstable and affects the performance of the TIA. According to the analysis of embodiment 1, adjust A 2 The equivalent input capacitance of the TIA can be made to be approximately zero, so that a very high resistance value R f A wide signal bandwidth can also be obtained, and the noise voltage gain can be 0dB, making the TIA stable.

Embodiment 3

[0106] Embodiment 3 of the present invention sees Figure 10 As shown in the figure, PIN, A 1 、A 2 , Buffer, C T , R' in 、C ff The definition of is the same as that of embodiment 1, R f 、C f , R C 、C C Together make up A 1 The feedback network Z f , and satisfy the condition R f >>R c , C c >>C f , R f C f = R C C C . The difference from the implementations 1 and 2 is that the feedback network Z f The resulting equivalent input capacitance at the TIA input is C fin =C f C c / (C f +C c )≈C f , instead of (1+A in Embodiments 1 and 2 1 )C f , which allows a smaller capacitor value of C ff Compensate for the equivalent input capacitance of the TIA; the equivalent input resistance is R fin =(R f +R c ) / (1+A 1 )≈R f / (1+A 1 ), same as embodiment 1,2. Adjust A 2 It is also possible to make the equivalent input capacitance of the TIA approximately zero, thus using a very high resistance value R f A wide signal bandwidth can also be obtained, and the...

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Abstract

The invention provides an optical-receiver preamplifier for receiving analog or digital optical signals. The preamplifier comprises a high-gain amplifier A1, an input circuit, a negative-feedback impedor Zf, a low-gain amplifier A2 adjustable in gain and a feedback capacitor Cff, wherein the input circuit takes a photoelectric converter as a main component; the negative-feedback impedor Zf is connected with the reverse input end and the output end of the A1; the feedback capacitor Cff connects the output end of the A2 with the reverse input end of the A1; and the output end of the A1 can be directly connected with the input end of the A2 or can be connected with the input end of the A2 through a buffer. Output signals of the preamplifier are taken out from the output end of the A1 or the output end of the buffer, and can be directly subjected to subsequent signal processing or be further amplified and then subjected to subsequent signal processing.

Description

technical field [0001] The invention belongs to the field of sensitive electronics and sensors in electronics and information systems, and specifically relates to a low-noise, high-gain-bandwidth product transimpedance amplifier, which is suitable for optical receivers for analog or digital optical signals, especially for optical receivers Among the received optical signals, the analog or digital optical receiver with weak light intensity corresponding to the extracted signal, and the above-mentioned optical receiver with wide frequency band, high sensitivity and high signal-to-noise ratio. Background technique [0002] Transimpedance amplifier (hereinafter referred to as TIA) is a preamplifier widely used in optical receivers. Its function is to convert the weak current signal generated by the light signal onto the photoelectric device into a voltage signal. The photoelectric device can be a p-i-n photodiode PIN , or avalanche photodiode APD, etc., the following description...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F3/08H03F1/26H04B10/158H04B10/60
Inventor 陈祥训
Owner CHINA ELECTRIC POWER RES INST
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