Multi-stage amplifier with shared directional coupler feedback

Details Multi-stage amplifier with shared directional coupler feedback Multi-stage amplifier with shared directional coupler feedback

1991-04-05

1993-05-04

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330310, H03F 360

Patent

active

052085538

ABSTRACT:
An n-stage amplifier circuit includes n+1 directional couplers connected in series between the circuit input, the amplifier stages, and the circuit output. Each coupler includes first and third ports forming an inverting interface, and second and fourth ports forming a non-inverting interface, the ports being coupled through suitable windings. Feedback lines are connected between adjacent successive couplers. The interfaces of the couplers are connected such that feedback loops covering one or more contiguous successive amplifier stages provide negative feedback for the amplifier circuit.

REFERENCES:
patent: 3618126 (1971-11-01), Gerst et al.

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