Current mode track and hold circuit

Details Current mode track and hold circuit Current mode track and hold circuit

1997-06-12

1998-11-24

Williams, Howard L.

Coded data generation or conversion

Sample and hold

341141, 327 94, H03M 100, G11C 2702

Patent

active

058413839

ABSTRACT:
A current mode track and hold(T/H) circuit is provided having a high degree of accuracy. The current mode T/H circuit includes an input node, and output node, a voltage controlled current source, and a switched integretor circuit. The input node is configured to receive an input analog current signal and a feedback current provided by the voltage controlled current source. The output node is configured to receive an output analog current signal generated by the voltage controlled current source. The feedback current is equal to the output current, and both are proportional to a control voltage generated by the switched integrator circuit. The switched integrator circuit operates in either a tracking mode or a holding mode in accordance with a received binary T/H control signal. In the tracking mode, charge produced by a difference between the feedback current and the input analog current is integrated by the switched integrator circuit. Integration of charge causes a change in the control voltage generated by the switched integrator circuit. The change in control voltage, in turn, causes a change in feedback current until a steady rate is reached wherein the feedback current, and there by the output current, equals the input current. In the holding mode, the voltage controlled current source maintains the output at a constant value equal to the input current at a point in time when the switch circuit transitions from the tracking mode to the holding mode.

REFERENCES:
patent: 5164616 (1992-11-01), Lewis et al.
patent: 5227676 (1993-07-01), Bahr et al.
patent: 5418408 (1995-05-01), Mangelsdorf et al.
patent: 5760616 (1998-06-01), Vallancourt

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