Oscillators – With frequency adjusting means – Step-frequency change
Patent
1998-09-30
2000-10-03
Mis, David
Oscillators
With frequency adjusting means
Step-frequency change
331 36C, 331177V, 331181, 334 56, 334 58, H03B 512, H03L 7099, H03J 320, H03J 524
Patent
active
061279005
ABSTRACT:
The present invention includes a Voltage Controlled Oscillator (VCO) having a resonant circuit capable of being quickly switched between two resonant frequencies in order to generate two different LO frequencies. In a preferred embodiment, the present invention includes a VCO having a dual-frequency resonant circuit attached to the VCO's resonant circuit input leads. The dual-frequency resonant circuit is constructed in a differential architecture in order to create a number "virtual ground" points within the circuit that nearly eliminate any ground currents, and thus minimize the time required to switch the resonant circuit between the two LO frequencies. The switching between two resonant frequencies is achieved by creating a short circuit across certain components within the circuit to eliminate them from the resonant circuit. The combination of the differential architecture dual-frequency resonant circuit with a single VCO provides for the power efficient and space-saving generation of both LO frequencies needed for a wireless transceiver. Moreover, by requiring only one resonant circuit, the area on the circuit board within the wireless transceiver is greatly reduced, resulting in a smaller transceiver circuit.
REFERENCES:
patent: 5714915 (1998-02-01), Brilka
patent: 5745013 (1998-04-01), Hohmann
patent: 5852384 (1998-12-01), Sakakura et al.
patent: 5892410 (1999-04-01), Peckham
Fladager Roy H.
Laub Dana Vincent
Tham Julian L.
Conexant Systems Inc.
Mis David
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