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Tracking and holding circuit with dynamic error compensation function

A technology for maintaining circuit and dynamic error, applied in differential amplifiers, DC-coupled DC amplifiers, analog-to-digital converters, etc., and can solve problems such as difficulty in error compensation

Inactive Publication Date: 2014-03-19
SUZHOU BATELAB MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the amount of error is usually dynamic and the compensation of the error is difficult

Method used

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  • Tracking and holding circuit with dynamic error compensation function
  • Tracking and holding circuit with dynamic error compensation function
  • Tracking and holding circuit with dynamic error compensation function

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Embodiment Construction

[0028] The present invention provides circuits and methods to compensate for dynamic errors caused by circuit switching. The switch is coupled in series between the first node and a capacitor, ideally providing a

[0029] The voltage of the coupled signal is equal to the voltage. The circuits and methods of the present invention measure the voltage drop across the switch and then compensate for the voltage drop by adding the measured voltage to the voltage provided by the capacitor.

[0030] These circuits and methods are best used in track-and-hold circuits, which are sometimes called sample-and-hold circuits. Note that in these cases the sample and hold circuits are distinct from the track and hold circuits and the invention applies to both circuits.

[0031] figure 1 A typical track and hold circuit 100 including a CMOS switch 104 is shown. Alternatively, switch 104 may be an NMOS or PMOS FET. Track and hold circuit 100 also includes capacitor 106 , CMOS switch 110 , d...

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Abstract

A tracking and holding circuit with a dynamic error compensation function is provided. Since a dynamic error is caused by voltage drop of a switch which is coupled in series with the tracking and holding circuit, a capacitor should provide voltage that is the same as a coupling switch signal, rather than switch voltage drop, wherein the switch can be, for example, a MOS tube or particularly, a CMOS device; and dynamic error compensation is used for measuring voltage drop passing through the switch, and then the measured voltage drop is effectively added for the voltage provided by the capacitor.

Description

Technical field: [0001] The present invention track and hold circuit. More particularly, the present invention relates to circuits and methods for compensating dynamic errors in track and hold circuits. A track-and-hold circuit (sometimes called a sample-and-hold circuit) usually operates in two modes, one is a track mode (such as tracking) an input signal, and the other is a hold mode, which enters a hold as the input signal is received before mode, typically generating and tracking an output signal with the same voltage. A track and hold circuit usually includes a switch coupled in series with a capacitor. The switch is normally closed (i.e. conducting) in tracking mode and open (i.e. non-conducting) in hold mode. In tracking mode, the capacitor charges up to the input signal voltage level. In the holdover state, the capacitor is usually kept away from any load and provides a fixed output voltage signal. Background technique: [0002] Track and hold circuits are often...

Claims

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Application Information

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IPC IPC(8): H03M1/12H03F3/45
Inventor 不公告发明人
Owner SUZHOU BATELAB MICROELECTRONICS
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