Agilent Technologies, Inc.

Avago Technologies Wireless IP (singapore) Pte. Ltd.

Avago Technologies General IP Pte, Ltd.

Chul Hong Park

Lovell Harold Camnitz

James Wholey

An amplifier system is provided for amplifying an input signal to provide an amplified output signal, amplifying an amplified input signal to provide a further amplified output signal, and phase delay compensating variations of the amplifications of the amplified output signal and the further amplified output signal for providing the further amplified output signal with substantially linear amplification under a variable load.

Amplifier system having compensated amplification variation

A method for forming a temperature-compensated resistor on a semiconductor substrate is provided. A resistor element is formed on the semiconductor substrate. Terminal contacts are formed on the ends of the resistor element. A temperature-compensating configuration is formed, and is selected from an enlarged transverse portion in the resistor element intermediate and spaced from the terminal contacts, and at least one contact pattern along and in contact with the resistor element intermediate and spaced from the terminal contacts.

Temperature-compensated resistor and fabrication method therefor

A circuit and method for transmitting an output signal utilizes an inductive device connected in series with a microelectromechanical systems (MEMS) varactor to increase the potential difference across the MEMS varactor due to the output signal by introducing inductance-capacitance resonant behavior. The MEMS varactor is configured to be actuated exclusively by the output signal to effectuate a change in capacitance of the MEMS varactor. The MEMS varactor is used to provide a variable impedance transformation.

Circuit and method for transmitting an output signal using a microelectromechanical systems varactor and a series inductive device

An impedance transformation network, power amplifier and method for efficiently transmitting an output signal utilizes a series varactor device to provide a variable impedance transformation. The series varactor device may include a number of stacked ferroelectric varactors that function as a variable capacitor to provide the variable impedance transformation in response to the power level of the output signal.

Impedance transformation network, power amplifier and method for efficiently transmitting output signal using a series varactor device

A power splitter receives power and has a first and second power output. The first power output is connected first power limiting section. A first matching circuit connects between an output of the first power limiting section and a first phase shifter. A second phase shifter connects between the second power output and a second power limiting section. An output of the second limiting section connects to a second matching circuit. A power combiner receives the output of the first phase shifter and the second matching circuit output. The power from the power combiner is delivered to the load.

Sectional power/voltage/current limiter for a multi-phase amplifier

An integrated circuit (IC) with high electron mobility transistors, such as enhancement mode pseudomorphic high electron mobility transistors (E-pHEMTs) and method for fabricating the IC utilizes an increased gate-to-drain etch recess spacing in some of the high electron mobility transistors to provide on-chip electrostatic discharge protection. The use of the increased gate-to-drain etch recess spacing allows smaller high electron mobility transistors to be used for ancillary low speed applications on the IC, which reduces the chip area occupied by these ancillary transistors.

Integrated circuit with enhancement mode pseudomorphic high electron mobility transistors having on-chip electrostatic discharge protection

A passive interface circuit for coupling an output signal from a power amplifier to a load is disclosed. The interface presents an impedance to the power amplifier that increases as the power level in the output signal decreases. In one embodiment, the interface circuit includes a fixed network and a capacitor having a capacitance that varies with the potential across the capacitor. The fixed network couples the output signal to the load. The capacitor is connected in parallel with the load and has a capacitance that increases in response to an increase in potential across the capacitor. The capacitor is preferably a MEM capacitor having plates that move with respect to one another in response to changes in the average potential difference between the plates.

Self-tuned matching network for high efficient power amplifiers

A meter for measuring the root-mean-squared potential of an AC signal characterized by a frequency f is disclosed. The meter includes first and second capacitors. The AC signal is applied to the first capacitor, which includes first and second plates separated by a distance that depends on the root-mean-squared potential of the AC signal, but not on changes in the AC signal that occur over a time of 1/f. The second capacitor has first and second plates separated by a distance that depends on the separation of the first and second plates in the first capacitor. A detection circuit measures the capacitance of the second capacitor. The first plate of the first capacitor is preferably connected to the first plate of the second capacitor by a non-conducting mechanical link.

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San Jose, CA, United States of America

Chul Hong Park