Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1997-09-12
1999-11-30
Bost, Dwayne D.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455115, 455126, 455127, 455 69, H04B 104, H04B 700, H04B 138
Patent
active
059958537
ABSTRACT:
A radio transmission/reception system using the same frequency includes a power control circuit which can prevent a sensitivity of the receiver from being lowered due to the carrier radiated from the transmitter, and finely control the power. The power control circuit includes first and second variable attenuators being respectively installed at an intermediate frequency stage and a local oscillator frequency stage, so as to finely control the power level of a next radio frequency stage. A CPU (central processing unit) controls amounts of attenuation of the first and second variable attenuators. Each of the first and second attenuators includes a first pin diode connected so as to be turned on in response to a signal level from the intermediate frequency stage and so as to generate a first current flowing toward an output of the attenuator, and a second pin diode connected so as to be turned on in response to a signal level from the central processing unit and so as to generate a second current flowing in an opposite direction of the first current.
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Bost Dwayne D.
Bushnell Esq. Robert E.
Redmon Joy
Samsung Electronics Co,. Ltd.
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