Integrated Device Technology, Inc.

Stmicroelectronics R&d (shanghai) Co. Ltd.

Shawn Wang

Jeffrey G Barrow

Jianhua Zhao

Yumin Zhang

A voltage regulator includes an amplifier to generate a difference voltage responsive to a comparison of a reference voltage and a feedback voltage. An output driver is coupled to the amplifier and drives a regulated output voltage responsive to the difference voltage. An impedance circuit is coupled between the output driver and a low power source and establishes the feedback voltage responsive to a current through the impedance circuit. A variation detector is operably coupled between the regulated output voltage and the difference voltage and is configured to modify the difference voltage. In some embodiments, the difference voltage is modified responsive to a rapid change of the regulated output voltage capacitively coupled to the variation detector. In other embodiments, the difference voltage is modified responsive to a rapid change of the feedback voltage capacitively coupled to the variation detector.

Apparatuses and methods responsive to output variations in voltage regulators

For coarse resistor string DACs, a resistor string is placed in an array of columns and rows, each resistor tap is connected to a switch network, and a decoder is used to select switches to be closed such that sub-DAC voltage comes from the resistor taps connected to the selected switches. The voltages from each row are fed into multiplexers, wherein the multiplexers produce output voltages. DAC circuit designs extend the resolution of the output voltages by feeding them into a voltage interpolation amplifier. A method and apparatus are disclosed for implementing Gray code to design coarse DAC architecture for voltage interpolation such that the number of switches required by the circuit is significantly reduced, thereby decreasing required surface area, and improving glitch performance without increasing design complexity.

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Shanghai, China

Shawn Wang