Intel Corporation

Stephen C Thilenius

Mark Joseph Callicotte

A reference buffer circuit includes a first switched capacitor selectively coupled to a first node that receives a reference voltage from a buffer device connected to the first node. A second switched capacitor is selectively coupled to a voltage source to receive a charging voltage from the voltage source. A first switch is coupled to the first switched capacitor to switch communication of the first switched capacitor between the first node and a second node. And, a second switch is coupled to the second switched capacitor to switch communication of the second switched capacitor between the voltage source and the first node, wherein the second switched capacitor delivers the charging voltage to the first switched capacitor.

Low power reference buffer circuit utilizing switched capacitors

According to one aspect of the invention, an apparatus is provided which includes a first amplifier and a common mode feedback circuit. The first amplifier includes a first input, a second input, a first output, and a second output. The first input and the second input are coupled to receive a first input voltage and a second input voltage, respectively. The first and second outputs provide a first output voltage and a second output voltage, respectively. The common mode feedback circuit has first and second switched capacitors coupled to provide a common mode feedback signal based on the first and second output voltages to the first and second inputs of first amplifier.

Method, apparatus, and system for common mode feedback circuit using switched capacitors

A line driver with an integrated termination comprises a driver current mirror, a feedback resistor, and a controlled current buffer. The feedback resistor and controlled current buffer may be coupled between the output and the input of the driver current mirror. The controlled current buffer may respond to the static current flowing through the feedback resistor. In an embodiment, the controlled current buffer output a static current that is reduced compared to other line drivers.

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Shingle Springs, CA, United States of America

Stephen C Thilenius