Patent ID: 6941116
Filing Date: 2005-09-06
Classification: H01Q,H03L

Abstract:
1. A differential linear phase locked loop comprises: phase and frequency detection module operably coupled to produce a differential charge up signal, a differential charge down signal, or a differential off signal based on at least one of a phase difference between a reference oscillation and a feedback oscillation and a frequency difference between the reference oscillation and the feedback oscillation; linearized charge pump operably coupled to produce a positive current signal in response to the differential charge up signal, a negative current signal in response to the differential charge down signal, and zero current signal in response to the differential off signal, wherein the linearized charge pump includes: low pass filter operably coupled to attenuate the high frequency modulated signal components and to pass, substantially unattenuated, the positive current signal, the negative current signal, and the zero current signal to produce a filtered signal; voltage controlled oscillator operably coupled to produce an output oscillation based on the filtered signal; and divider module operably coupled to divide the output oscillation by divider value to produce the feedback oscillation, wherein the divider value includes at least an integer portion.