Low amplitude peak detector

Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude

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327 59, 327 61, G01R 1900

Patent

active

060642386

ABSTRACT:
It is an object of the invention to provide a peak detector with improved precision for low amplitude AC signals for a broad range of input frequencies. One embodiment of the invention is broadly defined as an AC peak detector for receiving an input signal and a negative DC potential and providing an inverted peak output signal approximating an inverted steady state peak of the input signal, the AC peak detector comprising: a semiconductor junction means for receiving the input signal and the inverted peak output signal, and generating a correction signal proportional to an exponential function of the input signal and the inverted peak output signal; a resistance means for receiving the correction signal and sinking a bias current through the semiconductor junction means to the negative DC potential, such that the current/voltage characteristic of the semiconductor junction remains in an exponential region; and an amplifying means for receiving the correction signal and amplifying and inverting the correction signal to produce the inverted peak output signal, and for sourcing the constant bias current.

REFERENCES:
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Communications Circuits; Analysis and Design, Kenneth K. Clarke; Donald T. Hess; Addision-Wesley Publishing, Amplitude Demodulators, 10.5 Broadband Peak Envelope Detector, pp. 498-503, 1971.
Electronic Designer's Handbook, Second Edition; L.J. Giacoletto; R.W. Landee; D.C. Davis; A.P. Albrecht; McGraw-Hill, 1977, pp. 18-11 to 18-17.

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