Radio frequency voltage controlled oscillator

Details Radio frequency voltage controlled oscillator Radio frequency voltage controlled oscillator

2006-12-05

2006-12-05

Kinkead, Arnold (Department: 2817)

Oscillators

Solid state active element oscillator

Transistors

C331S1170FE, C331S1170FE, C331S167000

Reexamination Certificate

active

07145407

ABSTRACT:
A radio frequency voltage controlled oscillator (RF VCO) includes a differential oscillator including two field effect transistors (FETs) in which an electric current flows laterally to a substrate and a current source including a bipolar transistor in which the electric current flows in a direction either perpendicular or lateral to the substrate from an emitter to a collector via a base. Therefore, 1/f noise is very small. Resultantly, the RF VCO using the bipolar junction transistor as the current source reduces the 1/f noise generated by the current source of a RF CMOS VCO and, ultimately, the phase noise of the VCO.

REFERENCES:
patent: 6081167 (2000-06-01), Kromat
patent: 2002/0113659 (2002-08-01), Scoggins
patent: 2003/0095458 (2003-05-01), Park et al.
patent: 2003/0162343 (2003-08-01), Altmann
Andreani et al, *, IEEE Journal of Solid-State Circuits, vol. 37, No. 3, pp. 342-348, Mar. 2002 *Entitled: “Tail Current Noise Suppression in RF CMOS VCOs”.
Hegazi et al, *, IEEE Journal of Solid-State Circuits, vol. 36, No. 12, pp. 1921-1930, Dec. 2001 *Entitled: “A Filtering Technique to Lower LC Oscillator Phase Noise”.

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