Charge-based phase locked loop charge pump
First Claim
1. A charge-based charge pump comprising:
- a switchable capacitor configured for connection to a voltage source, a ground, and a charge pump output;
a first pair of switches including a first switch configured to connect the switchable capacitor to ground and a second switch configured to connect the switchable capacitor to the voltage source; and
a second pair of switches including a third switch configured to connect a first node, between the switchable capacitor and ground, to the charge pump output, and a fourth switch configured to connect a second node, between the switchable capacitor and the voltage source, to the charge pump output.
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Abstract
Charge-based charge pumps are described which include a switchable capacitor configured for connection to a voltage source, a ground, and a charge pump output. A first pair of switches include a first switch configured to connect the switchable capacitor to ground and a second switch configured to connect the switchable capacitor to the voltage source. A second pair of switches include a third switch configured to connect a first node, between the switchable capacitor and ground, to the charge pump output, and a fourth switch configured to connect a second node, between the switchable capacitor and the voltage source, to the charge pump output. Locked loop designs, such as phase locked loops or delay locked loops, are described that include charge-based charge pumps.
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Citations
20 Claims
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1. A charge-based charge pump comprising:
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a switchable capacitor configured for connection to a voltage source, a ground, and a charge pump output; a first pair of switches including a first switch configured to connect the switchable capacitor to ground and a second switch configured to connect the switchable capacitor to the voltage source; and a second pair of switches including a third switch configured to connect a first node, between the switchable capacitor and ground, to the charge pump output, and a fourth switch configured to connect a second node, between the switchable capacitor and the voltage source, to the charge pump output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A phase-locked loop (PLL) comprising:
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(i) a charge-based charge pump including, a switchable capacitor configured for connection to a voltage source, a ground, and a charge pump output; a first pair of switches including a first switch configured to connect the switchable capacitor to ground and a second switch configured to connect the switchable capacitor to the voltage source; and a second pair of switches including a third switch configured to connect a first node, between the switchable capacitor and ground, to the charge pump output, and a fourth switch configured to connect a second node, between the switchable capacitor and the voltage source, to the charge pump output; (ii) a phase/frequency detector configured to provide an UP or DOWN signal to the charge-based charge pump and to receive a reference clock signal and a feedback clock signal; (iii) a loop filter configured to receive an output voltage signal from the charge-based charge pump and provide an output voltage signal; and (iv) a voltage controlled oscillator (VCO) configured to receive the output signal from the loop filter and provide an output signal to the phase/frequency detector. - View Dependent Claims (17, 18, 19, 20)
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Specification