Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1994-11-01
1997-02-11
Faile, Andrew
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
4552501, 455254, H04B 110, H04B 116
Patent
active
056031149
ABSTRACT:
A distortionless receiving circuit used in a radio receiver to reduce degradation of the receiving sensitivity in case of a relatively lower receiving electric field. The circuit has a radio frequency amplifier, a mixer for frequency conversion, a variable attenuator interposed between the radio frequency amplifier and the mixer, an intermediate frequency amplifier disposed on the output side of the mixer, a detector and a control block. The control block generates a control signal in accordance with the intensity of the output signal of the intermeddle frequency amplifier. The attenuation amount of the variable attenuator is controlled by the control signal in a stepwise manner.
REFERENCES:
patent: 4553105 (1985-11-01), Sasaki
patent: 5321849 (1994-06-01), Lemson
Faile Andrew
NEC Corporation
Vo Nguyen
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