Radio receiver with logarithmic signal strength detector

Details Radio receiver with logarithmic signal strength detector Radio receiver with logarithmic signal strength detector

1984-03-26

1986-04-01

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Measuring or testing of receiver

455234, 455241, 455245, 455253, 330254, 330257, H04B 1700, H04B 116

Patent

active

045802874

ABSTRACT:
A radio receiver has one or more automatic gain control (AGC) circuits that each generate the gain-determining bias current in a separate main channel section or sections, e.g. RF amplifier, mixer, IF amplifier, of the radio receiver. The receiver is for the most part formed in an integrated silicon circuit, wherein the gain-controlling current in each case biases the base-emitter junction of an amplifying grounded-emitter transistor so that the gain thereof is directly proportional to the magnitude of the AGC control current. That current in each case is caused to flow through a diode string to generate a voltage drop thereacross that is logarithmic function of the AGC control current as well as of the radio signal amplitude at the input of the AGC controlled section. The sum of those diode voltages may be taken to produce a log of the product of the gains of the AGC controlled sections. Thus a sum signal is a logarithmic function of the radio signal input to the receiver.

REFERENCES:
patent: 2548913 (1951-04-01), Schreiner et al.
patent: 3774113 (1973-11-01), Chasek
patent: 3835378 (1974-09-01), Edden et al.
patent: 3940708 (1976-02-01), Sumi et al.
patent: 4065725 (1977-12-01), Lillis et al.
patent: 4143331 (1979-03-01), Page
patent: 4186351 (1980-01-01), Brefini et al.
patent: 4339728 (1982-07-01), Monticelli
patent: 4492926 (1985-01-01), Kusakabe et al.

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