ESTABLISHING A TUNING SIGNAL WINDOW FOR USE IN CENTERING A MULTI-BAND VOLTAGE CONTROLLED OSCILLATOR

摘要

A technique for establishing a tuning signal window for a multi-band VCO involves setting (350) the tuning signal window to an initial size, preferably a relatively small size, and determining (352) whether the VCO is churning. When the VCO is determined to be churning, the tuning signal window is expanded (354) until the VCO stops churning. In an embodiment, the tuning signal window is expanded incrementally until the tuning signal window is large enough to include a solution, where a solution is defined as an operating point along a frequency band that satisfies both the setpoint frequency and tuning window signal requirements. The tuning signal window can be set at an offset (171) relative to the tuning signal zero to compensate for shifts in the frequency bands that may result from changes in operating conditions.