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Burst trans-impedance amplifier with reset signal

A technology of transimpedance amplifier and reset signal, which is applied to DC-coupled DC amplifiers, differential amplifiers, improved amplifiers to reduce noise effects, etc., can solve the problems of unsupported process options and rising process costs, and achieve the effect of low DC drift

Pending Publication Date: 2019-08-02
XIAMEN UX HIGH SPEED IC
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Problems solved by technology

[0015] But this method has a disadvantage. The typical turn-on voltage of a diode is about 0.7V. Even if a MOS FET is used as a diode, its threshold is basically above 0.4V.
Generally, the TIA output amplitude will not produce obvious distortion only within 0.2Vpp. Therefore, it is generally realized by using a special low threshold (low threshold) device. Commercial processes do not support process options for this particular device

Method used

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  • Burst trans-impedance amplifier with reset signal
  • Burst trans-impedance amplifier with reset signal
  • Burst trans-impedance amplifier with reset signal

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0040] refer to Figure 7 , a burst transimpedance amplifier with a reset signal, the input photocurrent signal is input from the junction of the input terminal of the forward amplifier-A and the feedback resistor RF, and the NMOS transistor N0 is connected in parallel with the feedback resistor RF;

[0041] The output signal of the forward amplifier-A is divided into two paths, one path is directly input to the inverting input terminal of the differential voltage amplifier Diff Amp; the other path passes through the series resistor R S and R L After that, it is input to the inverting input terminal of the differential voltage amplifier Diff Amp and the operational amplifier OP;

[0042] After the signal is amplified by the differential voltage amplifier, it becomes a differential signal OUTP / OUTN and is output to the off-chip;

[0043] Swit...

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Abstract

The invention provides a burst trans-impedance amplifier with a reset signal. An input photocurrent signal is input from a junction of an input end of a forward amplifier-A and a feedback resistor RF.An NMOS tube NO is connected with the feedback resistor RF in parallel; an output signal of the forward amplifier-A is divided into two paths, and one path is directly input into the inverting inputend of the differential voltage amplifier Diff Amp; the other path passes through resistors RS and RL in series and then is input to a differential voltage amplifier Diff Amp and an inverting input end of an operational amplifier OP; after being amplified by the differential voltage amplifier, the signal is converted into a differential signal OUTP / OUTN, and the differential signal OUTP / OUTN is output to the outside of the chip; and a switch S is connected with the resistor RL in parallel and is controlled by the reset signal RESET. In the lead code stage, the switch s is switched on, and in the data section, the switch s is switched off.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to a transimpedance amplifier. Background technique [0002] In modern high-speed optical fiber communication systems, the transimpedance amplifier TIA 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 core indicators of a typical transimpedance amplifier circuit are transimpedance Z T , bandwidth f -3dB , equivalent input noise I n can be deduced as: [0004] [0005] [0006] [0007] In addition, the input dynamic range is also an important i...

Claims

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Application Information

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IPC IPC(8): H03F1/26H03F3/45
CPCH03F1/26H03F3/45
Inventor 林少衡柯腾隆
Owner XIAMEN UX HIGH SPEED IC
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