Patent ID: 7928811

Claim:
A switched mode temperature compensated crystal oscillator (TCXO) compromising: a TCXO to generate a reference clock; a mode switch signal adapted to control an operating mode of the TCXO; wherein when the mode switch signal is set to an active compensation mode the TCXO compensates the reference clock for changes induced by temperature variations, and when the mode switch signal is set to a fixed compensation mode the TCXO does not compensate the reference clock for changes induced by temperature variations; and a satellite navigation receiver adapted to control the mode switch signal, wherein the satellite navigation receiver includes a signal acquisition module to acquire satellite signals using the reference clock and a plurality of tracking channels to coherently track the satellite signals using the reference clock, wherein the signal acquisition module and the plurality of tracking channels operate in parallel and the mode switch signal is controlled to aid the signal acquisition module without causing discontinuities in the reference clock when at least one of the tracking channels is coherently tracking.