Variable gain RF amplifier with linear gain control

Details Variable gain RF amplifier with linear gain control Variable gain RF amplifier with linear gain control

1992-12-11

1994-04-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330294, H03G 330

Patent

active

053070267

ABSTRACT:
The circuit amplifies an input RF band of signals and exhibits a signal gain in decibels that is a linear function of a logarithmic control signal input. The circuit employs a transistor having an emitter electrode connected through an inductor/resistor combination to a source of common potential. Within a limited band of RF frequencies, the resistor inductor combination appears to be a high impedance. A PIN diode is connected in shunt across the resistor/inductor combination and, in response to a control current, alters its RF resistance. A capacitor is connected across the emitter of the transistor and provides a tuning function so that, at the mid-frequency of the RF band, a resonant tuned circuit results, thereby causing a high value resistive load to appear across the PIN diode. In this manner, linear gain control is achieved by varying a DC control current through the PIN diode.

REFERENCES:
patent: 3023369 (1962-02-01), Horowitz
patent: 3942181 (1976-03-01), Berrod et al.
patent: 4583050 (1986-04-01), Shinomiya

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