Qualcomm Incorporated

Jae-Hong Chang

Frederic Bossu

Gang Zhang

Tsai-Pi Hung

Yung-Chung Lo

Yiping Han

A method, an apparatus, and a computer program product are provided. The apparatus may be a regulator circuit. The regulator circuit includes a first voltage regulator to regulate a first input voltage to the first voltage regulator, the first voltage regulator including a P-type metal-oxide-semiconductor (PMOS), a second voltage regulator to regulate a second input voltage to the second voltage regulator, and a switch circuit to selectively activate at least one of the first voltage regulator or the second voltage regulator. In one aspect, the second voltage regulator includes an N-type metal-oxide-semiconductor (NMOS). In one aspect, the second voltage regulator comprises a two-stage operational transconductance amplifier (OTA) circuit. In an aspect, the first voltage regulator is coupled to the second voltage regulator.

On-chip dual-supply multi-mode CMOS regulators

A method, an apparatus, and a computer program product are provided. The apparatus may be a regulator circuit. The regulator circuit includes a first voltage regulator to regulate a first input voltage to the first voltage regulator, the first voltage regulator including a P-type metal-oxide-semiconductor (PMOS), and a second voltage regulator to regulate a second input voltage to the second voltage regulator, the second voltage regulator including an N-type metal-oxide-semiconductor (NMOS). In an aspect, the first voltage regulator is coupled to the second voltage regulator.

Certain aspects of the present disclosure generally relate to automatic amplitude control of an oscillating signal output from a voltage-controlled oscillator (VCO) using feedback from an amplitude adjustment circuit. The VCO may comprise cross-coupled metal oxide semiconductor (MOS) transistors coupled to a resonant tank circuit. Gates of the cross-coupled transistors are configured to control an amplitude of the oscillating signal generated by the resonant tank circuit. In certain aspects, the amplitude adjustment circuit may comprise a peak detector that generates a signal that is representative of the amplitude of the oscillating signal. The signal generated by the peak detector may be compared to a reference voltage by an amplifier. The amplifier may generate a feedback signal to control the gates of the cross-coupled MOS transistors based on the comparison, thereby adjusting the amplitude of the oscillating signal.

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San Diego, CA, United States of America

Jae-Hong Chang