Qualcomm Incorporated

Yung-Chung Lo

Yiping Han

Bhushan Shanti Asuri

Frederic Bossu

Zhang Jin

Gang Zhang

Tsai-Pi Hung

Jae-Hong Chang

Hyejeong Song

Sahar Nozari

Youngchang Yoon

Chen Zhai

Ning Yuan

Apsara Ravish Suvarna

A load line impedance modulation circuit includes a magnetic circuit, an adjustable capacitance coupled to an output of the magnetic circuit, and a plurality of adjustable resistances coupled to the output of the magnetic circuit, wherein the plurality of adjustable resistances are configured to select from available output ports, an impedance presented by the load line impedance modulation circuit being adjustable dependent on at least a number of selected output ports.

Multi-mode multi-port driver for transceiver interface

A transceiver interface circuit, comprising a driver amplifier (DA), a load line impedance modulation circuit coupled to the DA; and multiple selectable output ports coupled to the load line impedance modulation circuit, an impedance presented by the load line impedance modulation circuit being adjustable dependent on at least a number of output ports coupled to the load line impedance modulation circuit.

Aspects of the disclosure relate to a local oscillator frequency divider for a receiver or transmitter. In this regard a frequency divider has a first frequency input coupled to a first oscillator frequency output, a second frequency input coupled to a complementary second oscillator frequency output, a first in-phase/quadrature (I/Q) divided frequency output, and a complementary second I/Q divided frequency output. The frequency divider further has a first alternating current (AC) coupling capacitor between the first frequency input and the first oscillator frequency output and a second AC coupling capacitor between the second frequency input and the second oscillator frequency output.

Local oscillator divider with reduced applied current variation

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 provide techniques and apparatus employing an isolation ring having a center strip of conductive material used to isolate magnetic fields generated by common-mode and differential-mode current flow through one or more inductors disposed in the ring. The apparatus generally includes an electrical component having an inductive element and a ring of electrically conductive material encircling the inductive element, wherein the ring has a strip of electrically conductive material disposed in the ring and connecting a first point on the ring to a second point on the ring.

Divided ring for common-mode (CM) and differential-mode (DM) isolation

Certain aspects of the present disclosure provide an inductor-enclosed switchable voltage-controlled oscillator (VCO), for use in a frequency synthesizer of a radio frequency integrated circuit (RFIC), for example. One example apparatus is a frequency synthesizer that generally includes a first VCO circuit comprising a first inductor and a second VCO circuit comprising a second inductor, wherein at least a portion of the first VCO circuit is disposed inside a loop of the second inductor. According to certain aspects, at least a portion of the second VCO circuit is disposed inside a loop of the first inductor.

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San Diego, CA, United States of America

Yung-Chung Lo