Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1991-06-03
1992-11-03
Dzierzynski, Paul M.
Amplifiers
With semiconductor amplifying device
Including gain control means
330289, H03G 330
Patent
active
051608987
ABSTRACT:
An amplifier which contains two amplifier stages. Each amplifier stage (433,435) utilizes a diode (407) to attenuate the RF input signal (401) and to stabilize the bias current over temperature. The two amplifier stages (433,435) are cascaded together. The control voltage inputs are serially coupled through a transistor (423). The transistor (423) shifts the voltage of the control signal (425) down, thereby, shifting the control characteristics and AM characteristics of the first amplifier stage (435) relative to the second amplifier stage (433).
REFERENCES:
patent: 3512096 (1970-05-01), Nagata et al.
patent: 3553601 (1971-01-01), Glasser
patent: 3560995 (1971-02-01), Zielinski et al.
patent: 4225827 (1980-09-01), Davis
patent: 4367443 (1983-01-01), Hull et al.
patent: 4992753 (1991-02-01), Jenson et al.
RCA, Technical Notes, 1258, Sep., 11, 1980, Donald Henry Willis Amplifier Having Adjustable Gain and Constant Input Impedance.
Dailey Kirk W.
Dinh Tan
Dzierzynski Paul M.
Hackbart Rolland R.
Motorola Inc.
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