Patent ID: 7978017
Filing Date: 2011-07-12
Classification: H03B,H03K,H03L

Abstract:
1. An apparatus to generate a harmonic reference signal, the apparatus comprising: a reference resonator configured to generate a first reference signal having a resonant frequency; a control voltage generator configured to provide a temperature-dependent control voltage, said control voltage generator comprising: a first current source configured to generate a temperature-dependent current; a variable resistance circuit coupled to the first current source, an amount of resistance of the variable resistance circuit selectable to determine a variation in the temperature-dependent current for a corresponding variation in temperature; and a plurality of variable reactance modules couplable to the reference resonator and couplable to the control voltage generator, each reactance module of the plurality of variable reactance modules configured to modify a corresponding reactance in response to the control voltage to maintain the resonant frequency within a predetermined variance over a predetermined temperature range; wherein the variable resistance circuit comprises: