Lucent Technologies Inc.

Prominenet Communications, Inc.

Prominent Communications, Inc.

Khong-Meng Tham

Kadaba R Lakshmikumar

Krishnaswamy Nagaraj

David Arthur Rich

During transient operation of a voltage regulator, the gate of p-channel MOS pass transistor may be pulled down during the transient period to cause excessive surge current. The surge current is limited by using the pass transistor as a current mirror during the transient period. After the transient period, the pass transistor resumes its role as an element together with a differential amplifier and a reference voltage in a feedback loop to regulate the output voltage.

Transient current and voltage protection of a voltage regulator

A control circuit is used to increase the dc current of a low noise amplifier for a mobile wireless communication system in the presence of jamming signal to preserve high dynamic range and low intermodulation distortion. The control circuit compares the peak jamming signal with the average input signal. The average signal is obtained by filtering the input signal with a low-pass filter. The difference signal between the input signal with jamming signal and the average input is detected by a peak detector. The detected signal is then again compared with the average input signal to obtain a dc control signal to control the power consumption of a LNA.

Power consumption control for low noise amplifier

Briefly, in accordance with one embodiment of the invention, a charge pump comprises: a plurality of transistors coupled in a transistor circuit configuration. The transistor circuit configuration is adapted to be coupled to an electronic circuit. The plurality of transistors are coupled so as to deliver electrical charge to the electronic circuit in response to applied signals as the difference of two substantially predetermined currents.

Charge pump having high switching speed and low switching noise

Briefly, in accordance with one embodiment of the invention, a current source comprises: a first and a second current path, the current paths being coupled so as to provide, during circuit operation, first and second currents through the respective current paths in a substantially predetermined direct proportion. The current source further includes an operational amplifier having its respective input terminals coupled to the first and second current paths, the operational amplifier being coupled in a feedback configuration so as to maintain substantially equal voltages between a first and second predetermined point respectively located along the first and second current paths. Furthermore, the respective first and second currents are related to the respective first and second voltages substantially in accordance with the junction diode equation.

Growing community of inventors

San Diego, CA, United States of America

Khong-Meng Tham