Patent ID: 7106141
Filing Date: 2006-09-12
Classification: H03C,H03L

Abstract:
1. A phase locked loop comprising: an adjustable charge pump that generates a control voltage according to a control signal and a correction signal; a voltage controlled oscillator that receives the control voltage and generates an output frequency according to the control voltage; an analog to digital converter that receives the control voltage and generates a digital word therefrom; a first register that receives and stores the digital word from the analog to digital converter; a table memory that receives the digital word from the register and also receives a channel word and forms a table entry comprising an actual gradient from the digital word and the channel word; an evaluation unit that receives the table entry from the table memory and generates a gradient error therefrom; a second register that receives and stores the gradient error from the evaluation unit; and a programmable current source that receives the gradient error from the second register and generates the correction signal according to the gradient error.