Variable gain distributed amplifier

Details Variable gain distributed amplifier Variable gain distributed amplifier

1989-09-18

1990-08-07

Mullins, James B.

Amplifiers

With distributed parameter-type coupling means

Distributed amplifier

330277, 330278, H03F 360

Patent

active

049471368

ABSTRACT:
The invention relates to a variable gain distributed amplifier for use at microwave frequencies, and fabricated in a monolithic microwave integrated circuit format. In the amplifier, the attenuation is varied, based upon digital control of a dual gate segmented FET. The amplifier has a nearly flat insertion phase and amplitude response, and an insertion phase response that varies only slightly between gain settings. The amplifier employs segmented dual gate field effect transistors as the gain elements, having their signal input and signal output electrodes which provide shunt capacities (C.sub.G1S, C.sub.DS) interconnected with serial inductances to form separate low pass transmission lines having relatively high cut-off frequencies. The amplifier has means to insure stability and uses Chebyshef equal ripple techniques to linearize the amplitude and insertion phase response.

REFERENCES:
patent: 4638190 (1987-01-01), Hwang et al.
patent: 4734751 (1988-03-01), Hwang et al.
patent: 4901032 (1990-02-01), Kumiak

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