Tuned phase stable limiter amplifier

Details Tuned phase stable limiter amplifier Tuned phase stable limiter amplifier

1984-10-09

1986-07-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including frequency-responsive means in the signal...

330303, 330305, 330306, H03F 3191

Patent

active

045982562

ABSTRACT:
A limiter amplifier having a pair of transistors connected in a common emitter, balanced push-pull amplifier type of circuit arrangement is disclosed. The transistors are interconnected by a series tuning capacitor at their emitters. A separate constant current source is connected to each of the emitters of the transistor pair. By selecting the value of the tuning capacitor to resonate with the inherent inductive component of the emitter source impedances in a particular frequency band, the limiter amplifier acts as a differential amplifier in the particular frequency band. The ac coupling of the emitters gives the limiter amplifier a bandpass filter type feature as well as high gain and low phase variation over large dynamic ranges of input signal amplitude. Impedance matching/buffer circuitry and isolation circuitry are also disclosed which permit the cascading of limiter amplifier gain stages. In a preferred embodiment of the invention, the limiter amplifier is formed in a monolithic integrated circuit and the tuning capacitor is mounted separately.

REFERENCES:
patent: 3323070 (1967-05-01), Hayes
patent: 3571761 (1971-03-01), Meek

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