Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
1999-06-15
2001-02-20
Zweizig, Jeffrey (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
Reexamination Certificate
active
06191621
ABSTRACT:
TECHNICAL FIELD
This invention relates to the art of peak detecting, i.e., finding the peak level of an analog signal, and more particularly, to a peak detector particularly suitable for burst mode communication.
BACKGROUND OF THE INVENTION
A problem in the art of peak detectors is that they use capacitors to store the peak amplitude of the signal whose peak is being detected. It is desirable to store the peak value as long as needed in the capacitor, e.g., for use in thresholding applications, especially where there may be long periods of reception of only a single value in the received signal, e.g. a long string of zeros. The value stored on the capacitor is buffered when providing its output for further processing. Although such buffering is necessary, disadvantageously, when the peak detector circuit is manufactured using bipolar devices, such buffering causes the capacitor to discharge, thereby reducing the period of time that the capacitor accurately stores the peak value.
SUMMARY OF THE INVENTION
I have recognized that the problem of the discharging of the peak detector capacitor for bipolar peak detectors can be overcome by substantially exactly duplicating, i.e., duplicating to within manufacturing tolerances, the current that is leaking out of the capacitor and injecting the duplicate current into the capacitor. Advantageously, the charge in the capacitor remains constant, and it can accurately store the peak value for a much longer time than could capacitors of prior art peak detectors.
REFERENCES:
patent: 5038055 (1991-08-01), Kinoshita
patent: 5469090 (1995-11-01), Narahara
patent: 5986481 (1999-11-01), Kaminishi
Lucent Technologies - Inc.
Rosenthal Eugene J.
Zweizig Jeffrey
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