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Sampling holder

A technology of sample-and-hold device and sample-and-hold circuit, which is applied in instruments, static memory, analog-to-digital converters, etc., can solve problems such as difficulties and high cost of operational amplifiers, and achieve the effects of low amplification, high gain, and improved reliability

Inactive Publication Date: 2011-04-27
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In general, in order to achieve these design goals, the design of operational amplifiers is very expensive and difficult

Method used

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Embodiment 1

[0037] Please refer to figure 2 , The whole sample-and-hold device is divided into two parts: the first-stage sample-and-hold circuit and the second-stage sample-and-hold circuit. The first-stage sample-and-hold circuit and the second-stage sample-and-hold circuit are controlled by the timing control circuit so that the sampling phase of the first-stage sample-and-hold circuit corresponds to the hold phase of the second-stage sample-and-hold circuit, and the first-stage sample-and-hold circuit The holding phase corresponds to the sampling phase of the second-stage sample-and-hold circuit, so that the two work together. When the first-stage sample-and-hold circuit is in the sampling phase, its positive and negative output terminals are short-circuited (not affecting sampling), and the second-stage sample-and-hold circuit enters the hold phase at the same time. When the first-stage sample-and-hold circuit is in the holding phase, the second-stage sample-and-hold circuit samples ...

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Abstract

The invention discloses a sampling holder, which comprises a first-level sampling hold circuit and a second-level sampling hold circuit, wherein input positive and negative terminals of the first-level sampling hold circuit are connected with external signals; output positive and negative terminals of the first-level sampling hold circuit are coupled to input positive and negative terminals of the second-level sampling hold circuit; the first-level sampling hold circuit is provided with a first-level operational amplifier which realizes amplification below one multiple; the second-level sampling hold circuit is provided with a second-level operational amplifier which realizes amplification above one multiple; the external signals are sampled, held and amplified by the coordination of the first-level and second-level sampling hold circuits, and are output from output positive and negative terminals of the second-level sampling hold circuit. The invention also discloses a sampling hold method. Serving as a single processing basic module, the sampling holder is used for performing front-end processing on external input signals, and ensures the speed and precision of signal conversion by using a simple structure on the premise of realizing high reliability.

Description

[0001] This application is a divisional application of the patent application with the application number "200710124619.3" and the name "a sample holder and sample holder method". 【Technical Field】 [0002] The invention relates to analog and digital signal processing, in particular to a sample holder and a sample holder method. 【Background technique】 [0003] The sample and hold circuit (sample and hold) is also called the sample and hold amplifier. When the analog signal is converted from analog to digital, a certain conversion time is required. During this conversion time, the analog signal must remain basically unchanged, so as to ensure the conversion accuracy. The sample and hold circuit is the circuit that realizes this function. [0004] Figure 1a Shown is a traditional sample-and-hold circuit, in which the capacitor Cs is both a sampling capacitor and a holding capacitor. When in the sampling phase (sampling time), the switch controls the input and output of the operation...

Claims

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Application Information

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IPC IPC(8): H03M1/12G11C27/02
Inventor 阮建李崇仁
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
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