Qualcomm Incorporated

Apsara Ravish Suvarna

Youngchang Yoon

Bhushan Shanti Asuri

Zhang Jin

Muhammad Hassan

Yung-Chung Lo

Ning Yuan

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

A differential amplifier having a tunable filter is disclosed. The tunable filter may attenuate some common-mode signals while not affecting amplification of differential signals. The tunable filter may include a resonant circuit to select frequencies of common-mode signals to attenuate. The resonant circuit may include a variable capacitor series-coupled to an inductor. A resonant frequency of the resonant circuit may be determined, in part, by a capacitance value of the variable capacitor.

Amplifier with common-mode filter

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San Diego, CA, United States of America

Apsara Ravish Suvarna