Common base amplifier

Details Common base amplifier Common base amplifier

1992-12-14

1994-04-19

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

330308, H03F 308

Patent

active

053049497

ABSTRACT:
A common base amplifier (29) has an input (31) and an output (32). A transistor (33) has an emitter coupled to the input (31) of the amplifier (29), a collector coupled to the output (32) of the amplifier (29), and a base coupled to a voltage reference (34) provides low input impedance and unity current gain. A control circuit (38) controls a first bias circuit (36) and a second bias circuit (37). The second bias circuit (37) is coupled to the collector of the transistor (33) and provides a bias current for the transistor (33) while transistor (33) outputs the bias current which is received by the first bias circuit (36). Control circuit (38) determines the current magnitude for both the first bias circuit (36) and the second bias circuit (37) and ensures that the current magnitudes are maintained at a fixed ratio.

REFERENCES:
patent: 2647957 (1953-08-01), Mallinckrodt
patent: 4420724 (1983-12-01), Owen
patent: 5012202 (1991-04-01), Taylor
patent: 5216386 (1993-06-01), Wyatt

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