PHASE LOCKED LOOP
First Claim
1. A phase lock loop (PLL), comprising:
- a loop filter and a charge pump circuit;
whereinthe loop filter comprises;
a parallel capacitor having a first terminal and a second terminal;
a serial resistor having a first terminal and a second terminal, wherein the first terminal of the serial resistor is electrically connected to the first terminal of the parallel capacitor; and
a serial capacitor having a first terminal and a second terminal, wherein the first terminal of the serial capacitor is electrically connected to the second terminal of the serial resistor, and the second terminal of the serial capacitor is electrically connected to the second terminal of the parallel capacitor; and
the charge pump circuit comprises;
a first charge pump electrically connected to the first terminal of the serial resistor; and
a second charge pump electrically connected to the second terminal of the serial resistor.
1 Assignment
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Accused Products
Abstract
A phase locked loop comprises a loop filter and a charge pump circuit. The loop filter comprises a parallel capacitor, a serial resistor and a serial capacitor. A first terminal of the serial resistor is electrically connected to a first terminal of the parallel capacitor. A first terminal of the serial capacitor is electrically connected to the second terminal of the serial resistor, and a second terminal of the serial capacitor is electrically connected to a second terminal of the parallel capacitor. The charge pump circuit comprises a first charge pump and a second charge pump. The first charge pump is electrically connected to the first terminal of the serial resistor, and the second charge pump is electrically connected to the second terminal of the serial resistor. The phase lock loop can reduce output jitter and therefore increases the performance of the phase lock loop.
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Citations
9 Claims
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1. A phase lock loop (PLL), comprising:
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a loop filter and a charge pump circuit;
whereinthe loop filter comprises; a parallel capacitor having a first terminal and a second terminal; a serial resistor having a first terminal and a second terminal, wherein the first terminal of the serial resistor is electrically connected to the first terminal of the parallel capacitor; and a serial capacitor having a first terminal and a second terminal, wherein the first terminal of the serial capacitor is electrically connected to the second terminal of the serial resistor, and the second terminal of the serial capacitor is electrically connected to the second terminal of the parallel capacitor; and
the charge pump circuit comprises;a first charge pump electrically connected to the first terminal of the serial resistor; and a second charge pump electrically connected to the second terminal of the serial resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification