Cascode oscillator having optimum phase noise and bandwidth perf

Details Cascode oscillator having optimum phase noise and bandwidth perf Cascode oscillator having optimum phase noise and bandwidth perf

1996-02-05

1997-04-15

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

331117D, 331177V, H03B 512

Patent

active

056213620

ABSTRACT:
An oscillator (100) includes a tank circuit (102) coupled to a an active circuit (108). The feedback (104) provides the necessary feedback between the tank and the active circuit necessary for oscillation. The active circuit (108) is biased via a biasing circuit (106) and coupled out to a load via an external coupling (110). The active circuit (108) includes two transistors (124, 126) coupled to each other in a cascode configuration. Transistor (126) provides the collector current for transistor (124) while preventing it from entering saturation prematurely. The biasing circuit (106) provides sufficient current drain for the transistor (126) in order to provide for optimum phase noise and bandwidth performance of the oscillator 100.

REFERENCES:
patent: 4713632 (1987-12-01), Nishikawa et al.
patent: 4760352 (1988-07-01), Ash
patent: 4891610 (1990-01-01), Veith
patent: 5245298 (1993-09-01), Pham
Proceedings of IEEE, Feb. 1966 issue, pp. 329-330.

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