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DC restoration circuit with DC offset compensation function

A DC recovery and DC offset technology, applied in DC-coupled DC amplifiers, amplifiers with semiconductor devices/discharge tubes, amplifiers with only semiconductor devices, etc., can solve the output signal distortion and low common-mode level at the output And other issues

Pending Publication Date: 2017-07-25
XIAMEN UX HIGH SPEED IC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As mentioned above, due to the increase in gain, the DC offset of the front-stage circuit is further amplified by the differential amplifier stage, which may eventually cause the common-mode level of the output terminal to be high and low, resulting in serious distortion of the output signal

Method used

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  • DC restoration circuit with DC offset compensation function
  • DC restoration circuit with DC offset compensation function
  • DC restoration circuit with DC offset compensation function

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] refer to figure 2 , a DC restoration circuit with a DC offset compensation function, comprising: a transimpedance amplifier TIA, a differential amplifier Post Amp, an error amplifier Error Amp, a dummy amplifier DUMMY, and a switch tube M0;

[0028] The output terminals of the transimpedance amplifier TIA and the virtual amplifier DUMMY are respectively connected to the differential amplifier PostAmp; the error amplifier Error Amp includes two sets of positive and negative input terminals; one set of positive and negative input terminals are respectively connected to the The output terminals of the transimpedance amplifier TIA and the virtual amplifier DUMMY, and another set of positive and negative input terminals are respectively connected to the two output terminals of the differential amplifier Post Amp;

[0029] The output terminal of the error amplifier Error Amp is connected to the gate of the switch tube M1, the source of the switch tube M1 is grounded, and the...

Embodiment 2

[0042] refer to Figure 4 The difference between this embodiment and Embodiment 1 is that the error amplifier Error Amp adopts the form of voltage addition, and the DC voltages input by two sets of positive and negative input terminals are introduced into the feedback loop of the error amplifier Error Amp. One set of positive and negative input terminals of the error amplifier Error Amp is applied to the gates of the switch tubes M1 and M3, and another set of positive and negative input terminals is applied to the gates of the switch tubes M2 and M47; the switch tubes M1, The sources of M2, M3 and M4 are connected to the feedback loop; and the sources of the switching tubes M1 and M3 are connected, and the sources of the switching tubes M2 and M4 are connected.

[0043] The output voltage of the feedback loop is:

[0044] V ctrl =2·[g m1,2 (V IP1 -V IN1 )+g m3,4 (V IP2 -V IN2 )]·R o

[0045] where g m1,2 for V IP1 and V IN1 The transconductance between, g m3,4 fo...

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PUM

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Abstract

The invention provides a DC restoration circuit with a DC offset compensation function. The DC restoration circuit comprises a transimpedance amplifier, a differential amplifier, an error amplifier, a virtual amplifier and a switch tube M0; output ends of the transimpedance amplifier and the virtual amplifier are respectively connected to the differential amplifier; the error amplifier comprises two groups of positive electrode and negative electrode input ends, one group of positive electrode and negative electrode input ends is separately connected with the output ends of the transimpedance amplifier and the virtual amplifier, and the other group of positive electrode and negative electrode input ends is separately connected with two output ends of the differential amplifier; and the output end of the error amplifier is connected to a grid of the switch tube M0, the source of the switch tube M0 is grounded, and the drain of the switch tube M0 is connected with the input end of the transimpedance amplifier. The DC restoration circuit with the DC offset compensation function provided by the invention adopts multipath feedback on the basis of the original DC restoration circuit to perform DC offset compensation on the circuit so as to reduce the distortion of output signals.

Description

technical field [0001] The invention relates to a DC recovery circuit with a DC offset compensation function. Background technique [0002] The receiving front end of optical communication is mainly composed of a transimpedance amplifier circuit (TIA) and a limiting amplifier circuit (LA), while the transimpedance amplifier circuit is mainly composed of a transimpedance amplifier stage and a differential amplifier stage. The transimpedance amplifier stage converts current into voltage, and the differential amplifier stage further amplifies the output voltage of the previous stage to meet the requirements of the limiting amplifier circuit for the output (input) voltage of the previous stage. With the continuous improvement of the optical communication rate, the gain of the transimpedance amplifier stage is continuously reduced to meet the rate requirements. At the same time, the requirement for the gain of the differential amplifier stage is continuously increased to compensa...

Claims

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Application Information

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IPC IPC(8): H03F1/32H03F3/08H03F3/45H04B10/69
CPCH03F1/3211H03F3/082H03F3/45179H04B10/6933
Inventor 彭慧耀陈伟
Owner XIAMEN UX HIGH SPEED IC
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