Silicon Laboratories Inc.

Skyworks Solutions, Inc.

Riad S Wahby

Michael James Mills

Jeffrey Lee Sonntag

Ion Constantin Tesu

Eric B Smith

Siddharth Sundar

Timothy Joseph Dupuis

Marius Goldenberg

Donald E Alfano

Tufan C Karalar

Yan Zhou

Russell J Apfel

Yunteng Huang

Douglas R Frey

Jing Li

Jeffrey Allan Whaley

Hua Zhu

Anantha Nag Nemmani

Geoffrey Thompson

Current flowing through an inductor on a primary side of a voltage converter is sensed and compared to a threshold peak current value to determine when to end an ON portion of the voltage converter. The secondary side of the voltage converter supplies an indication of output voltage for use in determining the threshold peak current value. On start-up the primary side detects when the indication of output voltage is supplied by the secondary side across on isolation channel. Prior to detecting the indicating is being supplied, the primary side uses an increasing threshold peak current as the threshold peak current value. After detection that the indication of output voltage is being provided by the secondary side, the threshold peak current value is based on the indication of the output voltage.

Soft-start for isolated power converter

An apparatus for communicating using an isolation channel includes a transmitter circuit having a first terminal configured to communicate a first signal. The first signal oscillates in response to a data signal having a first signal level and is constant in response to the data signal having a second signal level. The transmitter circuit includes a second terminal configured to communicate that oscillates in response to the data signal having the second signal level and is constant in response to the data signal having the first signal level. The apparatus may include a receiver circuit configured to generate a recovered data signal having a first transition in a first direction between first and second levels based on an edge of a first received signal and having a second transition in a second direction between the first and second levels based on an edge of a second received signal.

Techniques for reduced jitter in digital isolators

A method includes supplying a current to at least one conductive path integral with a MEMS device to thereby exert a Lorentz force on the MEMS device in the presence of a magnetic field. The method includes determining the magnetic field based on a control value in a control loop configured to maintain a constrained range of motion of the MEMS device. The control loop may be configured to maintain the MEMS device in a stationary position. The current may have a frequency equal to a resonant frequency of the MEMS device.

Resonant MEMS lorentz-force magnetometer using force-feedback and frequency-locked coil excitation

A pseudo-constant portion of a switching cycle (ON time or OFF time) is constant over short periods of time but the pseudo-constant portion is controlled over longer periods of time in a slow frequency control loop to maintain a desired frequency. The average frequency is maintained at or near a desired frequency but when there is a transient, local disturbance, or load change, or other occurrence, then for a short period of time the frequency will vary as the non pseudo-constant portion of the switching cycle changes to address the transient or other occurrence. The frequency control loop will slowly adjust the pseudo-constant portion of the switching cycle to return to the desired frequency.

Pseudo-constant frequency control for voltage converter

Common mode transient immunity for an isolation system is improved by using a common transient suppression circuit coupled to a receive circuit to suppress transients in signals received by the receive circuit that were transmitted from a transmit side of the isolation barrier using optical, magnetic, inductive, or other mechanisms.

Suppression of transients in communications across an isolation barrier

A first integrated circuit die receives input data from a plurality of input channels and combines the input data from the plurality of input channels into combined data. The first integrated circuit die transmits the combined data across an isolation communication channel. A second integrated circuit die that is coupled to the isolation communication channel decodes the transmitted combined data and supplies the decoded transmitted combined data to respective output channels corresponding to the input channels.

Isolated serializer-deserializer

An isolation receiver includes at least one isolation capacitor to provide a first logic signal in response to a second logic signal that is provided by a transmitter. The receiver includes a signal processing circuit to amplify the first logic signal to generate an amplified signal, and the signal processing circuit includes a an amplifier to apply a nonlinear function. A comparator of the receiver provides a third logic signal in response to the amplified signal.

Isolation receiver

One embodiment of a power supply apparatus includes a first switcher coupled to provide VOUT from a VSUPPLY. A cascaded second switcher is coupled to provide a subscriber line interface circuit target VBAT from VOUT, wherein the first switcher is placed in one of an active mode and an inactive mode in accordance with a function of VSUPPLY and VBAT, wherein in the active mode wherein in the inactive mode VOUT&#x2248;VSUPPLY.

Power supply with digital control loop

A current mirror apparatus includes an input stage receiving an input current, I, and no additional bias current. The apparatus includes at least one output stage coupled to mirror the input current as an output current I. The input and output stages include insulated gate transistors. A minimum required voltage drop (V) across the input stage is approximately 2V+2V, wherein Vis a threshold voltage of a selected one of the insulated gate transistors, wherein Vis a drain-to-source saturation voltage of the selected transistor. A minimum required voltage drop (V) across the output stage is approximately 2V.

Wide-swing cascode current mirror

One embodiment of an apparatus for switching a transistor includes a first current mirror providing i=Ki, as a transistor base current, wherein the first current mirror is selectively driven by a current source A second current mirror providing a feedback signal i=Kito the first current mirror such that wherein icontributes to the transistor collector current, wherein i=i&#x2212;KKi.

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New York, NY, United States of America

Riad S Wahby