Regenerative receiver architectures for millimeter-wave and sub-millimeter-wave imaging and communication
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United States of America Patent
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Jul 7, 2015
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Jan 30, 2014
app pub date -
Feb 15, 2013
filing date -
Sep 10, 2010
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Abstract
A millimeter and sub-millimeter wavelength receiver imaging apparatus and method which directly generates a time encoded digital signal for an imaging pixel in response to interoperation of a digital quench circuit, an envelope detector, and a regenerative oscillator coupled to an antenna. The device utilizes the fact that oscillator startup time in a regenerative oscillator is inversely proportional to injected pixel image power. A digital quench circuit, such as a latch, is coupled for activating and deactivating the regenerative oscillator in response to receiving an output from an envelope threshold circuit, and for generating a time encoded digital signal in response to pixel amplitude during millimeter and sub-millimeter wavelength imaging. Receiver embodiments are described for both fundamental frequency operation (DRR) and for multi-frequency imaging (IRR).
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