Dual-mode voltage controlled oscillator using integrated...

Details Dual-mode voltage controlled oscillator using integrated... Dual-mode voltage controlled oscillator using integrated...

2007-09-11

2007-09-11

Chang, Joseph (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Particular frequency control means

C331S181000

Reexamination Certificate

active

10927785

ABSTRACT:
A novel form of an integrated variable inductor uses an on-chip transformer together with a variable capacitor. The variable capacitor can either be a varactor or a switched capacitor array and is connected to the secondary coil of the transformer. By changing the capacitance at the secondary coil of a transformer, the equivalent inductance looking into the primary coil of the transformer can be adjusted. With another capacitor in parallel to the primary coil, two different modes of resonance inherently exist, and a very wide frequency tuning range can be achieved by combining the two modes.

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