Charge pump circuit
AssigneeQUALCOMM Incorporated
InventorEmmanouil Terrovitis
Life of this patent
Estimating the term…
Abstract
A charge pump circuit is disclosed that includes a main charge pump, a replica charge pump, and an op-amp. The main charge pump includes up and down input terminals to receive UP and DN control signals, a control terminal to receive a calibration signal, and an output to generate a control voltage. The replica charge pump includes up and down input terminals to receive DN and UP control signals, a control terminal to receive the calibration signal, and an output to generate a replica voltage. The op-amp generates the calibration signal in response to the control voltage and the replica voltage.
Claims25
A charge pump circuit, comprising:
- a main charge pump including a first input to receive a first control signal, a second input to receive a second control signal, a third input to receive a calibration signal, and an output to provide a control voltage;
- a replica charge pump including a first input to receive the second control signal, a second input to receive the first control signal, a third input to receive the calibration signal, and an output to provide a replica voltage;
- and
- an operational amplifier including a first input to receive the control voltage, a second input to receive the replica voltage, and an output to provide the calibration signal.
A charge pump circuit, comprising:
- a main charge pump including an up input to receive an up control signal from a phase detector, a down input to receive a down control signal from the phase detector, a control input to receive a calibration signal, and an output;
- a replica charge pump including an up input to receive the down control signal from the phase detector, a down input to receive the up control signal from the phase detector, a control input to receive the calibration signal, and an output;
- and
- an operational amplifier including a first input coupled to the output of the main charge pump, a second input coupled to the output of the replica charge pump, and an output to provide the calibration signal.
A device, comprising:
- a main phase and frequency detector (PFD) including a first input to receive a reference signal, a second input to receive a feedback signal, a first output to generate a first main control signal, and a second output to generate a second main control signal;
- a replica PFD including a first input to receive a clock signal, a second input to receive the clock signal, a first output to generate a first replica control signal, and a second output to generate a second replica control signal;
- a main charge pump including an up input to receive the first main control signal, a down input to receive the second main control signal, a control input to receive a calibration signal, and an output to provide a control voltage;
- a replica charge pump including an up input to receive the first replica control signal, a down input to receive the second replica control signal, a control input to receive the calibration signal, and an output to provide a replica voltage;
- and
- an operational amplifier including a first input to receive the control voltage, a second input to receive the replica voltage, and an output to provide the calibration signal.
A method performed by a charge pump circuit, the method comprising:
- generating, using a main phase and frequency detector (PFD), a first main control signal and a second main control signal in response to a reference signal and a feedback signal;
- generating, using a replica PFD, a first replica control signal and a second replica control signal in response to a clock signal;
- generating, using a main charge pump, a control voltage in response to the first main control signal, the second main control signal, and a calibration signal;
- generating, using a replica charge pump, a replica voltage in response to the first replica control signal, the second replica control signal, and the calibration signal;
- and
- generating, using an operational amplifier, the calibration signal in response to the control voltage and the replica voltage.
Dependencies are inferred from the claim text.