Circuit for removing harmonic distortion in sampling and retaining circuit

A harmonic distortion and holding circuit technology, applied in the direction of physical parameter compensation/prevention, can solve problems such as limiting the useful voltage range of input signals, distortion, and limiting the useful frequency range of input signals

Inactive Publication Date: 2014-03-12
SUZHOU BATELAB MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many sample and hold circuits, however, the harmonic distortion produced by the circuit elements limits the useful voltage range of the input signal, limits the useful frequency range of the input signal, and requires a circuit designer to use more expensive components in the circuit, to eliminate distortion that would otherwise be produced by inferior components
The threshold, body effect, switching ratio and process changes of MOS field effect tubes cause nonlinear resistance characteristics in the sampling and holding circuit switches, resulting in distortion

Method used

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  • Circuit for removing harmonic distortion in sampling and retaining circuit
  • Circuit for removing harmonic distortion in sampling and retaining circuit
  • Circuit for removing harmonic distortion in sampling and retaining circuit

Examples

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Embodiment Construction

[0031] The circuit and method of the present invention eliminate the harmonic distortion generated by the sample and hold circuit.

[0032] like figure 1 As shown, a known sample and hold circuit 100. Circuit 100 includes inverter bank 102 to control the timing of circuit 100 in response to a hold signal at hold input 134; main sampling section 104 tracks and holds the voltage at signal input 136 so that it can Measured. Inverter bank 102 is composed of six inverters 106 , 108 , 110 , 112 , 114 and 116 . Main sampling section 104 consists of input diversion switch pair 118 (formed by input diverter switches 120 and 122 ), base resistor 124 , base capacitor 126 , ground diversion switch 128 , sampling capacitor 130 and sampling switch 132 . As shown, switches 120 , 122 , 128 , and 132 are MOSFETs, however, JFETs, bipolar transistors, and other suitable switching devices may be used to implement circuit 100 . Although not shown in the figure 1 In the switch 122 , 128 and 13...

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Abstract

The invention relates to a circuit for removing harmonic distortion in a sampling and retaining circuit. An auxiliary sampling part of the circuit is used for removing distortion generated by a main sampling part on the sampling and retaining circuit; the cancelling distortion of the auxiliary sampling part of the circuit is properly greater than the distortion generated by the main sampling part; then the distortion of the auxiliary sampling part is decreased so that the cancelling distortion is properly equal to the distortion of the main sampling part; finally the cancelling distortion on the auxiliary sampling part is substracted from the distortion of the main sampling part so that all distortion is fundamentally canceled, and thus the real part of an input signal is kept.

Description

Technical field: [0001] The present invention relates to sample and hold circuits. More particularly, the present invention relates to circuits and methods for eliminating harmonic distortion produced by sample and hold circuits. Background technique: [0002] Sample and hold circuits are widely used to sample a voltage and hold it at a constant level so that another circuit, such as an analog-to-digital converter connected to the sample and hold circuit, can measure the voltage. In many sample and hold circuits, however, the harmonic distortion produced by the circuit elements limits the useful voltage range of the input signal, limits the useful frequency range of the input signal, and requires a circuit designer to use more expensive components in the circuit, to eliminate distortion that would otherwise be produced by inferior components. The threshold, body effect, switching ratio and process changes of the MOS field effect tube cause the nonlinear resistance characte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/06
Inventor 李志鹏
Owner SUZHOU BATELAB MICROELECTRONICS
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