Patent ID: 6268780
Filing Date: 2001-07-31
Classification: H03C,H03L

Abstract:
An apparatus including a frequency synthesizer with a digital frequency lock loop (FLL), comprising:a frequency measurement circuit that couples to and receives from a controllable signal generator circuit a controlled signal having a controlled signal frequency, measures said controlled signal frequency and provides measured frequency data, whereinsaid controlled signal frequency has associated therewith a center frequency value, an instantaneous frequency value and a frequency deviation value equal to a difference between said center and instantaneous frequency values, andsaid measured frequency data represent said instantaneous frequency value;a modulation control circuit that couples to said controllable signal generator circuit, provides modulation data and provides to said controllable signal generator circuit a modulation control signal that controls said instantaneous signal frequency value, wherein said modulation data represent said frequency deviation value; anda data processing and control circuit, coupled between said frequency measurement circuit and said modulation control circuit, that couples to said controllable signal generator circuit, receives and processes said measured frequency data and said modulation data and provides to said controllable signal generator circuit at least one frequency control signal that controls said center signal frequency value.