Realtek Semiconductor Inc.

Hsiang-An Yang

Shih-Wei Wang

Chih-Chien Chang

Jian-Ru Lin

Wei-Chou Wang

A digital-to-analog converter (DAC) device includes a DAC circuitry. The DAC circuitry includes a first DAC circuit and a second DAC circuit. The first DAC circuit is configured to generate a first signal according to a plurality of least significant bits of an input signal. The second DAC circuit is configured to output a second signal according to a plurality of most significant bits of the input signal. A first turn-on time of at least one current source circuit in the first DAC circuit is configured to set the first signal.

Digital to analog converter device and current control method

A low dropout regulator includes a PMOS power transistor, a feedback network, an error amplifier and an active enhanced PSRR unit. The PMOS power transistor has a first end coupled to an input voltage, and a second end coupled to a load and the feedback network. The error amplifier receives a feedback signal generated from the feedback network, compares the feedback signal with a reference voltage to generate a difference value, and amplifies the difference value to generate an error signal. The active enhanced PSRR unit has one end coupled to the first end, and another end coupled to a control end of the PMOS power transistor and the error amplifier, detects an input voltage of the first end, and correspondingly adjusts a voltage of the control end to stabilize a voltage between the control end and the first end according to a variation of the input voltage.

Low dropout regulator with PMOS power transistor

A regulator includes a driver circuit, an amplifier circuit, a first current source circuit and a second current source circuit. The driver circuit is configured to receive an input voltage and provide an output voltage. The first current source circuit is configured to provide a first current to the amplifier circuit. The second current source circuit is configured to provide a second current to the amplifier circuit according to the output voltage if the output voltage deviates from a predetermined voltage. The amplifier circuit is configured to control the driver circuit according to the output voltage and a third current, in which the third current is a sum of the first current and the second current.

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Taipei, Taiwan

Hsiang-An Yang