A Broadband Track-and-Hold Circuit with Good High-Frequency Linearity

Abstract

The invention belongs to the field of integrated circuits, and is specifically a broadband tracking and holding circuit with good high-frequency linearity, including an input buffer, a main switching circuit, an output buffer and an auxiliary switching circuit; state, it will not cause the devices in the input buffer to enter a saturated state, and maintain a positive amplification state during the entire working process, so the signal establishment efficiency is significantly improved, and the maximum sampling bandwidth of the circuit is increased. In the hold state, the analog signal input terminal of the main switch circuit is at a fixed level, and the high-frequency analog signal input from the outside will not interfere with the hold signal on the sampling capacitor, thereby improving the high-frequency linearity. The circuit of the invention can be applied to the front-end sampling of the high-speed analog-to-digital converter to enhance its input bandwidth and high-frequency linearity.

Description

technical field [0001] The invention belongs to the field of integrated circuits, in particular to a wideband tracking and holding circuit with good high-frequency linearity. Background technique [0002] A / D Converter ADC is a data conversion system that converts analog signals into digital signals, and is the interface between the analog world and digital processing systems. With the improvement of application requirements, the frequency of the analog signal processed by the analog-to-digital converter is getting higher and higher, which has reached the order of several GHz, and the ADC is required to have a very high analog input bandwidth and good sampling linearity. The design of the ADC at the technical level brings great challenges. In order to solve such problems, the sampling front-end circuit can be used to sample the high-frequency signal before the high-speed ADC, and then the subsequent ADC will sample and quantize the sampled discrete signal. , the sampling fr...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems existing in the prior art, the present invention proposes a new tracking and holding circuit, which has high sampling bandwidth and very good high-frequency linearity, and solves the problems of low signal bandwidth and high analog input frequency of traditional tracking and holding circuits. The problem of time linearity degradation

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