Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1993-10-20
1995-06-27
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 60, 327 73, 327 78, 327 91, 327 95, G01R 1904, H03K 524
Patent
active
054283078
ABSTRACT:
The present invention is a closed loop peak detection circuit comprising switching means, comparing means, control means, two current sources, and a holding capacitor. The switching means selectively provides one of a plurality of input signals to the comparing means. The control means is coupled to the comparing means. The control means receives first and second control signals for selecting one of three modes: reset, peak detect, and hold. First and second current sources are coupled to the control means. A capacitor is coupled to the first and second current sources for generating an output signal. The output signal is feedback coupled to the comparing means. The comparing means determines when one of the plurality of input signals exceeds the output signal. The control means enables and disables the current sources in response to the comparing means and to the first and second control signals. In reset mode, the second current source discharges the capacitor until the output voltage is equal to a baseline voltage V.sub.REF. In peak detect mode, the first current source charges the capacitor when the instantaneous value of the output signal is less than the input signal. The peak detector uses the input signal to pump up the output voltage to the most positive value of input signal. In hold mode, the current sources are disabled. The capacitor maintains a nearly constant amount of charge. Thus, the output voltage is equal to the peak voltage of the input signal stored on the capacitor.
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IBM Technical Disclosure Bulletin, Cunningham, "High Speed Peak Detector", Feb. 79, pp. 3544-3545.
Callahan Timothy P.
Cunningham Terry D.
Silicon Systems Inc.
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