Abstract
The conventional measurement signal sample-and-hold amplifier comprising a sample and hold circuit in the form of a sample switch, a voltage hold capacitor, and a voltage repeater further includes two similar sample-and-hold circuits of reference voltages. The idea of the proposed amplifier is that hold capacitors are equally discharged in all three sample-and-hold circuits. Therefore, an affine ratio for the stored three voltage samples does not change the intrinsic value over a long discharge time. Then, this invariant affine ratio is taken as the measuring signal. A reproducing (recovery) unit, which is also included, calculates this affine ratio. In turn, the included information signal former shaper pre-converts (prepares) the initial measurement signal using reference voltages. Thus, the hold time is significantly increased, while maintaining a short sample time for the given hold capacitor. On the other hand, the affine ratio uses differences and voltage ratios. Therefore, offset errors are mutually reduced. It is possible to implement the proposed sample-and-hold amplifier in the form of an analog chip based on a multiplier and the known multi-channel sample-and-hold amplifier.
Highlights
Sample-and-hold amplifier (SHA, or track-and-hold amplifier) is an important component of different data converters and digital systems, such as signal processing systems, multichannel data acquisition systems, automatic test equipment, medical and analytical instrumentation, event analysis, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), etc
The input buffer amplifier, energy storage device, output buffer amplifier, and switching circuit are common to all SHAs as shown in the typical configuration of Fig. 1
The output buffer offers a high impedance to the hold capacitor to keep the held voltage from discharging prematurely
Summary
Sample-and-hold amplifier (SHA, or track-and-hold amplifier) is an important component of different data converters and digital systems, such as signal processing systems, multichannel data acquisition systems, automatic test equipment, medical and analytical instrumentation, event analysis, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), etc. The input buffer amplifier, energy storage device (hold capacitor CH ), output buffer amplifier, and switching circuit are common to all SHAs as shown in the typical configuration of Fig. 1. The idea of the proposed amplifier is that hold capacitors are discharged in all three SHCs. an affine ratio for the stored three voltage samples does not change the intrinsic value over a long discharge time. An affine ratio for the stored three voltage samples does not change the intrinsic value over a long discharge time This invariant affine ratio is taken as the measuring signal.
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