Dual band voltage controlled oscillator

Details Dual band voltage controlled oscillator Dual band voltage controlled oscillator

1997-08-15

1998-10-13

Grimm, Siegfried H.

Oscillators

Plural oscillators

Adjustable frequency

331 49, 331 60, 331117R, 331117D, 331115, 331117V, 331179, H03B 512, H03B 518

Patent

active

058218203

ABSTRACT:
A voltage controlled oscillator operable on two widely separated frequency bands, such as 900 MHz and 1.8 GHz for example. The voltage controlled oscillator includes two negative resistance generators (32, 34) which share a common tunable tank circuit (26) and a common impedance matched combiner circuit (28) which provides the RF output (36). The VCO uses only one varactor (30) to tune both frequency bands. Separate negative resistance generators (32, 34) are used to provide optimum frequency selectivity within each frequency band.

REFERENCES:
patent: 4485355 (1984-11-01), Scott
patent: 5250910 (1993-10-01), Yabuki et al.
patent: 5418497 (1995-05-01), Martin
patent: 5535432 (1996-07-01), Dent
"RF Chip Set Provides Multiband Cellular/PCS Solutions," Author Unknown Published: Wireless System Design Issue: Jan. 1997, p. 62.

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