Fully differential adaptive bandwidth PLL with differential supply regulation
AssigneeConexant Systems, Inc.
InventorChandrashekar Reddy
Life of this patent
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Abstract
Provided is a fully differential adaptive bandwidth phase locked loop with differential supply regulation. One fully differential phase locked loop includes a differential active loop filter and regulator coupled to an output of a differential charge pump, a differential voltage-controlled oscillator coupled to differential control voltages developed by the differential active loop filter and regulator, and a bias circuit coupled to the differential control voltages and providing a bias current to the differential charge pump.
Claims20
A fully differential adaptive bandwidth phase locked loop (PLL) with differential supply regulation, the PLL comprising:
- a differential active loop filter and regulator (DALFR) coupled to an output of a differential charge pump;
- a differential voltage-controlled oscillator (DVCO) coupled to differential control voltages developed by the DALFR;
- and
- a bias circuit coupled to the differential control voltages and providing a bias current to the differential charge pump;
- wherein the DALFR includes:
- an active loop filter amplifier/regulator (ALFA/R);
- first and second feedback networks for respective first and second differential outputs of the ALFA/R;
- the first feedback network including a MOS capacitor and a PMOS transistor that is configured as a MOS resistor;
- the PMOS transistor having a gate coupled to the second differential output of the ALFA/R.
A fully differential adaptive bandwidth phase locked loop (PLL) with differential supply regulation, the PLL comprising:
- a differential active loop filter and regulator (DALFR) coupled to an output of a differential charge pump;
- a differential voltage-controlled oscillator (DVCO) coupled to differential control voltages developed by the DALFR;
- and
- a bias circuit coupled to the differential control voltages and providing a bias current to the differential charge pump;
- wherein the DALFR includes:
- an active loop filter amplifier/regulator (ALFA/R);
- first and second feedback networks for respective first and second differential outputs of the ALFA/R;
- the second feedback network including a MOS capacitor and an NMOS transistor that is configured as a MOS resistor;
- the NMOS transistor having a gate coupled to the first differential output of the ALFA/R.
A fully differential adaptive bandwidth phase locked loop (PLL) comprising:
- a differential active loop filter and regulator (DALFR) including:
- an active loop filter amplifier/regulator (ALFA/R);
- first and second feedback networks for respective first and second differential outputs of the ALFA/R;
- the first feedback network including a MOS capacitor and a PMOS transistor that is configured as a MOS resistor, and
- the PMOS transistor having a gate coupled to the second differential output of the ALFA/R.
Dependencies are inferred from the claim text.