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Single-ended to differential transimpedance amplifier

A transimpedance amplifier, single-ended to differential technology, applied in the direction of differential amplifiers, amplifiers, light-controlled amplifiers, etc., can solve the problem that the output conditions of single-ended to differential structures are difficult to meet, and achieve good robustness and good output symmetry sexual effect

Pending Publication Date: 2022-01-07
安徽传矽微电子有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the output conditions of the single-ended to differential structure are difficult to meet, the present invention provides a single-ended to differential transimpedance amplifier

Method used

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Embodiment Construction

[0039] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0040] see image 3 and Figure 4 , the single-ended-to-differential transimpedance amplifier in this embodiment mainly includes a main transimpedance amplifier 1 and a redundant transimpedance amplifier 2 .

[0041] The main transimpedance amplifier 1 includes a field effect transistor M 1 , FET M 3 , the feedback resistor Rf 1 , load resistance RL 1 , AC coupling capacitor Cc, may also include voltage divider resistor R 1 and LED VD.

[0042] Field Effect Transistor M 1 The gate of the single-ended-to-differential transimpedance amplifier as the input current i in +, field effect transis...

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Abstract

The invention discloses a single-ended to differential transimpedance amplifier, which comprises a main transimpedance amplifier, a redundant transimpedance amplifier, a capacitor C1 and a capacitor C2. The main trans-impedance amplifier comprises field effect transistors M1 and M3, a feedback resistor Rf1, a load resistor RL1 and an alternating current coupling capacitor Cc. The drain electrode of the M1 is grounded, the grid electrode of the M3 is connected with bias voltage VB, and the drain electrode of the M3 is connected with the source electrode of the M1 one end of Rf1 is connected with the base electrode of M1, and the other end is connected with the source electrode of M3. One end of the RL1 is connected with the source electrode of the M3, and the other end is connected with external voltage. The redundant trans-impedance amplifier comprises M2, M4, a feedback resistor Rf2 and a load resistor RL2. One end of the RL1 is connected with the drain electrode of the M3, and the other end of the Cc is connected with the grid electrode of the M2. C1 and C2 form an AC coupling pair of capacitive coupling, one end of C1 is connected with the source electrode of M2, the other end is connected with the base electrode of M4, one end of C2 is connected with the source electrode of M4, and the other end is connected with the base electrode of M3. Compared with the prior art, better output symmetry and robustness can be realized. When the small signal transconductance of the M3 and the M4 is the same, the output can be symmetrical. The small signal transconductance of M3 and M4 is easier to satisfy in the circuit work, and the robustness is better.

Description

technical field [0001] The invention relates to a single-end-to-differential transimpedance amplifier in the front-end design field of a photoelectric receiver, in particular to a single-end-to-differential transimpedance amplifier. Background technique [0002] Traditional transimpedance amplifiers use single-ended input, so pseudo-differential structures are often used to suppress common-mode noise, such as figure 1 shown. The specific principle is that the input signal passes through the main transimpedance amplifier, single-ended input and single-ended output, and a redundant transimpedance amplifier is added at the same time. The redundant transimpedance amplifier only outputs DC level and does not output signals. This increases chip area and power consumption. Recently, researchers have done some research on this problem, such as proposing a mirror image differential transimpedance amplifier, which realizes the function of single-ended input and differential output o...

Claims

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Application Information

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IPC IPC(8): H03F3/45H03F3/08
CPCH03F3/45179H03F3/082H03F2203/45051H03F2203/45062
Inventor 谢金峰林福江
Owner 安徽传矽微电子有限公司
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