Anadigics, Inc.

Adam Dolin

Dirk Leipold

Paul Sheehy

A direct current to direct current (DCDC) voltage converter is described comprising a controller and at least one converter circuit. The converter circuit comprises at least first and second inductors, each having an input and an output; a first input switch connected to the input of the first inductor; a second input switch connected to the input of the second inductor; and an output switch connected to the outputs of the inductors for selectively combining the outputs to form a parallel combination of the inductors or a series combination of the inductors. The controller generates signals for selectively connecting the first and second input switches and the output circuit between a pair of power supply input terminals and a pair of power supply output terminals. In response to appropriate signals from the controller, the converter circuit can be operated as a buck converter or a boost converter.

Switched inductor DC-DC converter

A DC-DC converter, capable of operation in either a boost or buck mode, includes a voltage source connected to an input switch through an inductive element such that a closed loop is formed. The DC-DC converter includes a switching network that receives one or more clock signals from an external clock source. The switching network has a first terminal connected to the inductive element, a second terminal connected to a first capacitor, and a third terminal connected to a second capacitor, wherein the switching network enables charging of the first capacitor and the second capacitor based on one or more clock signals such that the first capacitor and the second capacitor are charged alternately. The DC-DC converter includes a filter connected to a fourth terminal of the switching network, wherein the first capacitor and the second capacitor discharge alternately based on the one or more clock signals through the filter.

Boost-buck DC-DC converter

A current limiting circuit includes a power amplifier receiving an input signal through an attenuator. The power amplifier comprises one or more amplification stages and an output stage. The output stage is connected to an antenna. A mirror circuit is connected in parallel to the output stage. The magnitude of a first current flowing through the mirror circuit is proportional to the magnitude of a second current flowing through the output stage. Further, the current limiting circuit includes a comparator that compares the magnitude of the first current with a reference value to generate a control signal. The attenuator adjusts the power of the input signal based on the control signal thereby limiting the magnitude of the second current.

Current limiting circuit

A power control circuit for regulating an output voltage applied to a radio frequency power amplifier. The power control circuit includes an amplifier, a pass transistor and one or more saturation detectors. An input ramp voltage having a magnitude equal to a first voltage level is applied to a negative terminal of the amplifier. The pass transistor provides an output voltage at a drain terminal of the pass transistor. The saturation detector detects a magnitude of a voltage at a gate terminal of the pass transistor and generates a control current based on the magnitude of the voltage at the gate terminal of the pass transistor. The voltage regulating circuit reduces the magnitude of the input ramp voltage from the first voltage level to a third voltage level based on the control current.

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Springfield, NJ, United States of America

Adam Dolin