Patent Number: 6,806,781

Title: Tuning circuit having electronically trimmed VCO

Abstract: A voltage controlled oscillator (38) includes an LC tank (20) and a capacitor bank (21). LC tank (20) includes an inductor (12) and a varactor (14). The capacitive output of the varactor is controlled by a control voltage .nu.. To electronically tune the voltage controlled oscillator, a set of capacitors (24) in the capacitor bank (21) are enabled by a digital control signal based on a frequency comparison with a desired frequency. Once the capacitor bank is set, the frequency can be locked at the desired frequency by the phase lock loop.

Inventors: Bisanti; Biagio (Antibes, FR), Coppola; Francesco (Antibes, FR), Guignon; Pascal (Callian Fayence, FR)

Assignee: Texas Instruments Incorporated

International Classification: H03J 5/24 (20060101); H03L 7/099 (20060101); H03B 5/08 (20060101); H03B 5/12 (20060101); H03J 5/00 (20060101); H03L 7/08 (20060101); H03L 7/113 (20060101); H03L 007/00 ()

Expiration Date: 10/19/2021