Oscillators – Plural oscillators – Adjustable frequency
Patent
1994-07-05
1995-05-23
Grimm, Siegfried H.
Oscillators
Plural oscillators
Adjustable frequency
331 52, 331117R, 331167, 331177R, 331185, H03B 512
Patent
active
054184975
ABSTRACT:
BiCMOS technology is used in the design of a VCO (200) to improve low DC operation. The VCO (200) includes two coupled oscillator circuits (201,219) tuned to different fixed frequencies such that the oscillator resonant frequencies define the tuning range of the VCO (200). The oscillator circuits (201, 219) are coupled such that the frequency of oscillation of the VCO (200) is adjustable via variable resistors (206, 214) by manipulating the bias currents to the two oscillator circuits (201,219). A biasing circuit (208) along with variable resistors (206 and 214) provide the DC bias to the oscillator circuits (201 and 219). The biasing circuit (208) maintains the sum of the biasing currents to the oscillator circuits constant. The oscillator circuits (201, and 219) are interconnected utilizing an RF coupling circuit (211). The VCO (200) is capable of operating at voltages as low as 1.8 volts DC.
REFERENCES:
patent: 4660000 (1987-04-01), Kleinberg
IEEE Journal of Solid State Circuits, vol. 27, No. 3, Mar. 1992 "A 1.8-GHz Monolithic LC Voltage Controlled Oscillator", pp. 444-450. Nguyen et al.
Ghomeshi M. Mansour
Grimm Siegfried H.
Motorola Inc.
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