Efficient differential charge pump with sense and common mode control

A system and apparatus relating to a differential charge pump circuit for use in a phase-locked loop (PLL) circuit. A differential charge pump circuit can include a reference current, two sense amplifiers, a common mode control amplifier, and an h-bridge circuit. The h-bridge circuit is coupled to t...

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Bibliographische Detailangaben
Hauptverfasser:	Strom, James D, Trcka, Scott R, Kesselring, Grant P, Wu, Ann Chen
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROMTHE BODY ELECTRICITY GENERATION HUMAN NECESSITIES HYGIENE INFORMATION STORAGE INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER MEDICAL OR VETERINARY SCIENCE PHYSICS PULSE TECHNIQUE
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Beschreibung
Zusammenfassung:	A system and apparatus relating to a differential charge pump circuit for use in a phase-locked loop (PLL) circuit. A differential charge pump circuit can include a reference current, two sense amplifiers, a common mode control amplifier, and an h-bridge circuit. The h-bridge circuit is coupled to the reference current and the common mode control amplifier. The reference current drives a first portion of the h-bridge circuit and the common mode control amplifier controls a second portion of the h-bridge circuit. The h-bridge circuit also includes first and second nodes. The nodes are inputs to one of the sense amplifiers. The differential charge pump circuit is configured to control a voltage at the first node so that it is substantially equal to a voltage at the second node for a plurality of voltages at the second node. The differential charge pump circuit can also include a transistor with a gate coupled to an output of a sense amplifier. The voltage at the first node can be controlled by the sense amplifier and the transistor.