Logarithmic detector amplifier system for use as high sensitivity selective receiver without frequency conversion
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United States of America Patent
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Jun 25, 2019
Grant Date -
Jan 25, 2018
app pub date -
Oct 2, 2017
filing date -
Sep 12, 2013
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Abstract
A logarithmic detector amplifying (LDA) system is provided for use as a high sensitivity receive booster or replacement for a low noise amplifier in a receive chain of a communication device. The LDA system includes an amplifying circuit configured to receive an input signal having a first frequency and generate an oscillation based on the input signal, a sampling circuit coupled to the amplifying circuit and configured to terminate the oscillation based on a predetermined threshold to periodically clamp and restart the oscillation to generate a series of pulses modulated by the oscillation and by the input signal, and one or more resonant circuits coupled with the amplifying circuit and configured to establish a frequency of operation and to generate an output signal having a second frequency, the second frequency being substantially the same as the first frequency.
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