Cascode amplifier with an improved biasing arrangement

Details Cascode amplifier with an improved biasing arrangement Cascode amplifier with an improved biasing arrangement

1983-05-19

1986-05-06

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

330300, 330296, H03F 368, H03F 316

Patent

active

045874956

ABSTRACT:
A cascode amplifier comprises a grounded-emitter drive transistor which has a collector supplied with a bias current from a bias current source and operates in response to an input signal and a grounded-base (or grounded-gate) output transistor which has a collector supplied with a bias current from a constant voltage source, wherein the collector of the drive transistor is connected to the emitter (or source) of the output transistor. A constant current circuit is connected to the junction between the collector of the drive transistor and the emitter (or source) of the output transistor for supplying a part of the bias current applied to the drive transistor to thereby decrease the bias current of the output transistor while causing the drive transistor to be operated in the linear region. The cascode amplifier is thus imparted with a broad band frequency characteristic.

REFERENCES:
patent: 3462701 (1969-08-01), Miller
patent: 3546614 (1970-12-01), Lochstampfer
patent: 4203131 (1980-05-01), Harwood et al.

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