Sampling hold circuit, analog-to-digital converter and wifi chip

Abstract

The invention discloses a sampling hold circuit, an analog-to-digital converter and a wifi chip. The sampling hold circuit comprises a clock generation sub-circuit, a grid voltage bootstrap sub-circuit and a sampling field effect transistor; the grid voltage bootstrap sub-circuit outputs a second control signal to a grid electrode of the sampling field effect transistor, the voltage is the sum of the conduction voltage and the input voltage of the signal input end, and the conduction voltage is greater than the input voltage of an external power supply. The circuit does not introduce non-ideal harmonic waves, eliminates the interference of the input voltage of the signal input end on the sampling field effect transistor, does not generate negative influence on the output signal-to-noise ratio of the analog-to-digital converter, reduces the on-resistance of the sampling field effect transistor, and improves the response speed of the switch; the strict linear relation between the input signal and the output signal of the sampling hold circuit is guaranteed, and the performance of the circuit is improved.

Description

technical field [0001] The invention relates to a sampling and holding circuit, in particular to an analog-to-digital converter and a wifi chip provided with the sampling and holding circuit. Background technique [0002] In the process of sampling the analog input signal, most of the analog-to-digital converters (ADc) are equipped with a sample-and-hold circuit. The sample-and-hold circuit is used to stabilize the continuously changing analog input signal, and the two stages of tracking and holding are alternately performed. [0003] There are some problems in the existing sample and hold circuit, such as linear distortion, the sampling signal obtained by the sample and hold circuit will have non-ideal harmonics, so that when the circuit is used in a high-precision analog-to-digital converter, it will affect the analog-to-digital converter negatively impacts the output signal-to-noise ratio. In order to improve the problem of linear distortion, the existing technology will...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the linear distortion of the sample-and-hold circuit in the prior art and other problems introduced when improving these problems, the purpose of the present invention is to provide an Sample-and-hold circuits, analog-to-digital converters, and wifi chips that negatively affect the signal-to-noise ratio and respond quickly

Images