Clock generation circuit and analogue-to-digital converter (ADC) sampling circuit

Abstract

The invention discloses a clock generation circuit and an analogue-to-digital converter (ADC) sampling circuit. The clock generation circuit comprises a first input unit, a second input unit, a superposition unit and a clock signal output unit, wherein the first input unit is used for providing a voltage pulse signal on the basis of a first pulse control signal; the second input unit is used for providing an analogue pulse signal on the basis of a second pulse control signal; the superposition unit is connected with the first and second input units, and is used for receiving the voltage pulse signal and the analogue pulse signal, and superposing the voltage pulse signal and the analogue pulse signal to generate a clock pulse signal; and the clock signal output unit is connected with the superposition unit, and is used for outputting a clock signal on the basis of a third pulse control signal. By the clock generation circuit, the output clock signal is associated with an analogue signal input by a sampling circuit, so that a difference between the gate voltage and source input voltage of a transistor switch in the sampling circuit is a constant value, and harmonic distortion is reduced.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a clock generation circuit and an ADC sampling circuit. Background technique [0002] With the development of contemporary microelectronics technology, an analog-to-digital converter (Analog-to-Digital Converter, ADC) as an analog and digital signal interface circuit has been widely used. Compared with other analog-to-digital converters, the pipeline ADC (pipeline ADC) has the advantages of high speed, high precision and low power consumption. [0003] The function of the pipeline analog-to-digital converter is to convert the input analog quantity into a digital quantity. The conversion process generally includes four steps of sampling, holding, quantization and encoding. In actual A / D conversion, sampling and holding are often combined. Sampling (also known as sampling or sampling) refers to periodically extracting the amplitude of the input analog signal at a certain freque...

AI Technical Summary

Problems solved by technology

[0010] The present invention solves the problem that the circuit structure of the clock generation circuit in the prior art is complex, and the voltage value of the output clock signal is limited, and the transistor switch controlled by the clock signal still has a variable on-resistance.

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