Patent ID: 8212599
Filing Date: 2012-07-03
Classification: H03K,H03L

Abstract:
1. A signal generator comprising: an oscillator circuit responsive to a feedback signal to control a frequency of an oscillating output signal, wherein the oscillator circuit is configured to generate multiple phase oscillating output signals; a plurality of frequency-to-current conversion circuits in electrical communication with a respective one of the multiple phase oscillating output signals of the oscillator circuit, wherein each frequency-to-current conversion circuit is configured to generate a frequency dependent current signal, where the frequency dependent current signal corresponds to the frequency of the respective one of the multiple phase oscillating output signals; and a feedback conversion circuit in electrical communication with the frequency-to-current conversion circuits, wherein the feedback conversion circuit is configured to compare output signals of the frequency-to-current conversion circuits with a reference signal to generate the feedback signal to the oscillator circuit; wherein each frequency-to-current conversion circuit comprises: