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US 10,141,941 B2Granted
Differential PLL with charge pump chopping
AssigneeHuawei Technologies Co., Ltd.
InventorDmitry Petrov
Life of this patent
Estimating the term…
Abstract
According to a first example aspect there is provided a charge pump circuit that includes a first chopper circuit configured to switch first and second chopper circuit outputs between first and second chopper circuit inputs at a chopping frequency, wherein successive input signals at the first chopper circuit input are output alternatively at the first and second chopper circuit outputs in successive cycles of the chopping frequency and successive input signals at the second chopper circuit input are output alternatively at the second and first chopper circuit outputs in successive cycles of the chopping frequency. A differential charge pump is configured to receive the signals output from the first and second chopper circuit outputs and produce corresponding first and second charge pumped signals.
Claims20
A charge pump circuit comprising:
- an intake chopper circuit configured to switch input signals received at the first and second inputs of the intake chopper circuit between first and second outputs of the intake chopper circuit at a chopping frequency, wherein successive input signals at the first input are provided alternatively at the first and second outputs in successive cycles of the chopping frequency and successive input signals at the second input are provided alternatively at the second and first outputs in successive cycles of the chopping frequency;
- a differential charge pump configured to receive the signals from the first and second outputs of the intake chopper circuit and produce corresponding first and second charge pumped signals;
- and
- an output chopper circuit configured to receive the first and second charge pumped signals at respective first and second inputs, provide the first charge pumped signals alternatively at first and second outputs in successive cycles of the chopping frequency, and provide the second charge pumped signals alternatively at the second and first outputs in successive cycles of the chopping frequency.
1 more element
A method of applying charge pumping signals, comprising:
- at an intake chopper, switching successive input signals received at a first input alternatively between first and second outputs in successive cycles of a chopping frequency and switching successive input signals at a second input alternatively between the second and first outputs in the successive cycles;
- charge pumping the signals output from the first and second outputs to produce corresponding first and second charge pumped signals;
- and
- at an output chopper, receiving the first and second charge pumped signals at respective first and second inputs, providing the first charge pumped signals alternatively at first and second outputs in successive cycles of the chopping frequency, and providing the second charge pumped signals alternatively at the second and first outputs in successive cycles of the chopping frequency.
1 more element
A phase lock loop (PLL) comprising:
- an active low pass filter configured to generate one or more tuning signals;
- a voltage-controlled oscillator (VCO) coupled to the active low pass filter and configured to generate a feedback signal based on the one or more tuning signals;
- a phase frequency detector configured to compare the feedback signal to a reference signal and generate pull up and pull down signals based on the comparison;
- and
- a charge pump circuit comprising:
- an intake chopper circuit configured to modulate the pull up and pull down signals with a chopping frequency;
- an integral charge pump path configured to receive the modulated pull up and pull down signals and output corresponding positive and negative integral charge pumped signals;
- an integral path chopper circuit configured to modulate the positive and negative integral charge pumped signals at the chopping frequency;
- a proportional charge pump path configured to receive the modulated pull up and pull down signals and output corresponding positive and negative proportional charge pumped signals;
- and
- a proportional path chopper circuit configured to modulate the positive and negative proportional charge pumped signals at the chopping frequency,
- wherein the active low pass filter is coupled to the charge pump circuit to receive the positive and negative integral charge pumped signals and the positive and negative proportional charge pumped signals and configured to generate the one or more tuning signals based thereon.
9 more elements
A method of controlling a phase lock loop (PLL) having an active low pass filter configured to generate one or more tuning signals;
- a voltage-controlled oscillator (VCO) coupled to the active low pass filter and configured to generate a feedback signal based on the one or more tuning signals;
- a phase frequency detector configured to compare the feedback signal to a reference signal and generate pull up and pull down signals based on the comparison,
- the method comprising:
- modulating, using an intake chopper circuit, the pull up and pull down signals with a chopping frequency;
- charge pumping, using an integral charge pump path, the modulated pull up and pull down signals to output corresponding positive and negative integral charge pumped signals;
- modulating, using an integral path chopper circuit, the positive and negative integral charge pumped signals with the chopping frequency;
- charge pumping, using a proportional charge pump path, the modulated pull up and pull down signals and output corresponding positive and negative proportional charge pumped signals;
- modulating, using a proportional path chopping circuit, the positive and negative proportional charge pumped signals with the chopping frequency,
- receiving, at the active low pass filter, the positive and negative integral charge pumped signals from the integral path chopper circuit and the positive and negative proportional charge pumped signals from the proportional path chopper circuit, and generating the one or more tuning signals based thereon.
6 more elements
Dependencies are inferred from the claim text.