Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1994-10-25
1996-01-02
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
4552451, H03G 330, H04B 106
Patent
active
054812267
ABSTRACT:
A low-voltage IF amplifier (112) provides automatic gain control (AGC) of a source amplifier (104) supplying an IF input signal to the IF amplifier (112). The IF amplifier (112) includes cascaded amplifier stages (202) that include an amplifier element (344) having an input (122) for receiving a stage input signal, and an output (124) for generating an amplified stage output signal in response. The amplifier stages (202) also include a received signal strength detector (346), or RSSD, for generating a gain control current responsive to the stage input signal. The IF amplifier (112) also includes a current summer (206) for summing the gain control currents generated by the RSSDs (346) to produce a total gain control current, and a gain control element (204) that controls the gain of the source amplifier (104) in response to the total gain control current, such that signal levels within the source amplifier (104) are maintained within a linear operating range.
REFERENCES:
patent: 4794342 (1988-12-01), Kimura
patent: 5321851 (1994-06-01), Sugayama et al.
patent: 5369792 (1994-11-01), Matsumoto et al.
Motorola, Inc., Linear and Interface Integrated Circuits, pp. 8-29 to 8-34, 1988, U.S.A.
Breeden R. Louis
Motorola Inc.
Mottola Steven
LandOfFree
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