Telecommunications – Transmitter and receiver at separate stations – Having measuring – testing – or monitoring of system or part
Reexamination Certificate
2006-11-15
2009-12-15
Nguyen, Duc M (Department: 2618)
Telecommunications
Transmitter and receiver at separate stations
Having measuring, testing, or monitoring of system or part
C455S067140, C455S226100, C455S226300
Reexamination Certificate
active
07634236
ABSTRACT:
The invention is an electronic circuit for testing a receiver. In detail, the circuit includes a RF signal generator providing an RF signal to a first mixer. A first oscillator providing a first signal to the first mixer. The first mixer receives the RF signal and the first signal and provides a first output signal comprising the RF signal plus the first signal and the RF signal minus the first signal. A first filter is coupled to the first mixer for receiving the first output signal and providing a second output signal wherein the RF signal plus the first output signal is removed. A second mixer is coupled to the first filter and is adapted to receive the second output signal and a second input signal from a second oscillator; and provides a third output signal to a second filter. A fourth output signal from the second filter provides a fifth output signal for testing the receiver that is amplitude and temperature insensitive.
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Using Noise for RF Receiver Built-In Test Applications, Microwave Journal, Feb. 2004, by Patric Robbins, Micronetis, Inc. Hudson, NH.
Dachs Louis L.
Nguyen Duc M
Northrop Grumman Corporation
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