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Sampling-hold circuit

A technology of sample and hold circuit and hold circuit, applied in electrical components, electrical analog memory, electrical signal transmission system, etc., can solve the problems of increased chip area, increased number of terminals, and inability to maintain voltage.

Inactive Publication Date: 2005-09-07
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, there is a problem that the sampled voltage decreases with the lapse of time and cannot be used as a holding voltage for the output voltage VOUT
Therefore, when the capacitor is built in the integrated circuit, there is a problem that the chip area increases; when the capacitor is external, there is a problem that the number of terminals increases.

Method used

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Examples

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Embodiment Construction

[0026] === Application example of sample and hold circuit ===

[0027] The following describes a case where the sample-and-hold circuit of the present invention is applied to a television receiver.

[0028] Figure 4 It is a block diagram for explaining the decoding of a SECAM system signal. The so-called SECAM system is a standard specification for color television receivers in France and the like, and it is a system in which two color-difference signals are sequentially scanned and frequency modulated and multiplexed.

[0029] This SECAM frequency adjustment circuit includes a sample-and-hold circuit 100, a bell filter 200, a SECAM color demodulation circuit 300, a detection circuit 400, and a switch SW7 for switching the input of the bell filter 200.

[0030] The SECAM color signal processing is performed in the vertical period of the television receiver. At this time, the switch SW7 is switched to the SECAM VIDEO (SECAM video) side, and the SECAM VIDEO signal ("TV signal") is ...

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Abstract

Provided is a sample hold circuit capable of holding sampled voltage without being lowered. This sample hold circuit comprises: a comparator circuit for comparing one voltage with the other voltage in magnitude; a conversion circuit for converting a digital value corresponding to a comparison output into an analog value in accordance with the comparison result of the comparator circuit for a predetermined period of time, holding the analog value for the elapse of the predetermined period of time and outputting the analog value as the other voltage corresponding to the one voltage; and a control circuit that can perform conversion operation from the digital value into the analog value by the conversion circuit for the predetermined period of time.

Description

Technical field [0001] The present invention relates to a sample and hold circuit. Background technique [0002] The sample and hold circuit performs the following two actions: sampling the sampled voltage and holding the sampled voltage. For this sampling and holding, for example, a capacitor is used (for example, refer to Patent Document 1). Among them, in the case of integrating the sample and hold circuit, there are a built-in type in which a capacitor is built in an integrated circuit, and an external type of sample and hold circuit that is provided outside the integrated circuit. [0003] Figure 5 It is a circuit diagram of a conventional sample-and-hold circuit using capacitors. The left side of the dotted line in the figure represents the inside of the integrated circuit, and the right side of the dotted line represents the outside of the integrated circuit. [0004] The existing sample-and-hold circuit 500 has PNP type bipolar transistors (hereinafter referred to as PN...

Claims

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Application Information

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IPC IPC(8): H03M1/66G11C27/02H03M1/78
CPCE05C17/44E05C17/443E05C17/446
Inventor 仁木雅植木敬次郎
Owner SANYO ELECTRIC CO LTD
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