Patent ID: 7982550
Filing Date: 2011-07-19
Classification: H03L

Abstract:
1. An apparatus, comprising: a first oscillator to provide a first signal having a first frequency; a second oscillator to provide a second signal having a second frequency, wherein the first and second oscillators have a mismatch in temperature coefficients; and a differential frequency discriminator circuit coupled to receive the first and second signals, the differential frequency discriminator circuit being further coupled to control at least one of the first or second oscillators so as to control the frequency of the first signal provided by the first oscillator, to control the frequency of the second signal provided by the second oscillator, or a combination thereof; the differential frequency discriminator circuit being configured to control at least one of the first or second oscillators so as to control the frequency of at least one of the respective first or second signals based at least in part on the current frequency of the first and second signals to compensate for the mismatch in temperature coefficients and to match a given desired frequency difference between the first and second frequencies over a temperature range.