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A burst automatic gain control circuit with bit-by-bit control

An automatic gain control, bit-by-bit technology, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problem that the AGC control loop cannot be applied to the GPON receiving system, etc., achieve ultra-fast gain control without delay, and avoid convergence The effect of time, the effect of widening the dynamic range

Active Publication Date: 2018-11-02
XIAMEN UX HIGH SPEED IC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existence of this contradiction makes the traditional AGC control loop unable to be applied to the burst mode GPON receiving system

Method used

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  • A burst automatic gain control circuit with bit-by-bit control
  • A burst automatic gain control circuit with bit-by-bit control
  • A burst automatic gain control circuit with bit-by-bit control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A burst automatic gain control circuit with bit-by-bit control, comprising:

[0032] A transimpedance amplifier, in this embodiment, the amplifier is a cascode forward amplifier. It should be noted that the technical idea of ​​the present invention can be applied to various amplifiers, and is not limited to this embodiment. The amplifier includes a first MOS transistor m1 and a second MOS transistor m2; the drain of the first MOS transistor m1 is connected to the source of the second MOS transistor m2, the gate is connected to the input power supply, and the drain is grounded; the second MOS transistor The drain of the MOS transistor m1 is connected to the gate of the first MOS transistor m1 through the feedback resistor R1.

[0033] Feedback resistor R1, the two ends of which are respectively connected to the input end and the output end of the amplifier;

[0034] Limiter diode D1, its anode is connected to the gate of the first MOS transistor m1, and its cathode is ...

Embodiment 2

[0037] A burst automatic gain control circuit with bit-by-bit control, comprising:

[0038] A transimpedance amplifier, in this embodiment, the amplifier is a cascode forward amplifier. It should be noted that the technical idea of ​​the present invention can be applied to various amplifiers, and is not limited to this embodiment. The amplifier includes a first MOS transistor m1 and a second MOS transistor m2; the drain of the first MOS transistor m1 is connected to the source of the second MOS transistor m2, the gate is connected to the input power supply, and the drain is grounded; the second MOS transistor The drain of the MOS transistor m1 is connected to the gate of the first MOS transistor m1 through the feedback resistor R1.

[0039] Feedback resistor R1, the two ends of which are respectively connected to the input end and the output end of the amplifier;

[0040] The third MOS transistor m3 in a diode connection form has its drain connected to the gate and then conn...

Embodiment 3

[0043] A burst automatic gain control circuit with bit-by-bit control, comprising:

[0044] A transimpedance amplifier, in this embodiment, the amplifier is a cascode forward amplifier. It should be noted that the technical idea of ​​the present invention can be applied to various amplifiers, and is not limited to this embodiment. The amplifier includes a first MOS transistor m1 and a second MOS transistor m2; the drain of the first MOS transistor m1 is connected to the source of the second MOS transistor m2, the gate is connected to the input power supply, and the drain is grounded; the second MOS transistor The drain of the MOS transistor m1 is connected to the gate of the first MOS transistor m1 through the feedback resistor R1.

[0045] Feedback resistor R1, the two ends of which are respectively connected to the input end and the output end of the amplifier;

[0046] The drain of the vacuum current source m0 is connected to the input current, the gate is connected to th...

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Abstract

The invention provides a burst-type automatic gain control circuit controlled bit by bit. The burst-type automatic gain control circuit comprises a feedback resistor R1 and a shunting element; the two ends of the feedback resistor R1 are connected with the input end and the output end of an amplifier respectively, the shunting element is conducted along with the increasement of input currents of the input end of the amplifier to enable part of the input currents to flow through the shunting element. According to the burst automatic gain control circuit controlled bit by bit, due to the fact that a lowpass filtering link in a traditional burst automatic gain control circuit is omitted, the influence of convergence time is avoided, and gain control which is ultra high in speed and free of time delay is achieved.

Description

technical field [0001] The invention relates to an automatic gain control circuit. Background technique [0002] In modern high-speed optical fiber communication systems, the transimpedance amplifier TIA (Trans-Impedance Amplifier) ​​plays the role of converting and amplifying the weak photocurrent signal generated by the photodiode into a voltage signal, and outputting it to the subsequent circuit for processing. Therefore, TIA is at the forefront of the receiving end and is the core device of the receiving end of the optical communication system. Its core indicators such as noise, sensitivity, dynamic range, and sensitivity basically determine the performance of the entire receiving system. [0003] The input dynamic range is an important indicator in the transimpedance amplifier circuit, which is defined as the difference between the saturated input optical power and the sensitivity. Saturated input optical power and sensitivity are defined as the maximum and minimum inp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G3/20
Inventor 林少衡
Owner XIAMEN UX HIGH SPEED IC