Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Reexamination Certificate
2006-11-21
2006-11-21
Taylor, Barry (Department: 2617)
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
C455S087000
Reexamination Certificate
active
07139532
ABSTRACT:
In accordance with the present invention, a receiver circuit and a method of controlling voltage pulses, thereby improving the performance of the receiver are provided. The receiver circuit includes a switch for blocking high voltages and for converting voltage signals to current signals. The switch includes first and second signal terminals and a control terminal. The switch exhibits an ON resistance when closed, wherein the ON resistance is controlled by an electric value at the control terminal. The receiver circuit also includes a control circuit coupled to the switch for controlling the ON resistance of the switch in closed mode. The first switch signal terminal is coupled to an output of a transducer and the second switch signal terminal is coupled to an input of a low-noise amplifier circuit. The switch is a transmit/receive switch which is open during a transmission time interval and closed during a reception time interval. The switch passes only low-voltage pulses to the low-noise amplifier circuit which requires an input resistance and a feedback resistance. The ON resistance of the switch is the input resistance of the low-noise amplifier circuit. The control circuit is a servo-loop circuit for generating an electric value at the control terminal of the switch when closed.
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Koninklijke Philips Electronics , N.V.
Taylor Barry
LandOfFree
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