MULTIPLE BANDWIDTH CRYSTAL CONTROLLED OSCILLATOR

摘要

A dual bandwidth crystal controlled oscillator (200) is described having a first transconductance amplifier (202) providing sufficient gain to maintain oscillation with an oscillator crystal (210) at a minimum current drain. A second transconductance amplifier (218) is provided which can be selectively coupled to the first transconductance amplifier (202), thereby augmenting the gain of the first transconductance amplifier (202) to provide the capability for rapid oscillator start-up following battery saver operation. The dual bandwidth crystal controlled oscillator (200) can be utilized in conventional oscillator and frequency synthesizer applications.