Integration Associates Incorporated

Microchip Technology Inc.

Intergration Associates Inc.

János Erdélyi

Ferenc Mernyei

Attila Zólomy

Matthijs D Pardoen

Hendricus De Ruijter

Péter Onódy

András Vince Horváth

Jean-Luc Nauleau

Péter Szilveszter Kovács

Steven Bible

András Hegyi

William McCalpin

Phil Li

Gábor Tóth

Peter Kovacs

In a serial transmission method using a two-wire serial interface, a master device transmits a first synchronous serial signal via the two-wire serial interface to wake-up a slave device followed by an asynchronous data transmission on one of the two-wires of the two-wire serial interface. The asynchronous data signal directly controls a function of the slave device.

Two-wire serial interface and protocol

Disclosed is a circuit and method for automatic tuning of a resonant circuit in a transceiver having a receiver and a transmitter that includes a power amplifier for driving the resonant circuit. During a transmit mode of the transceiver, a resonance voltage of the resonant circuit is compared to an input voltage signal to the power amplifier to determine an error signal that is converted into a control word. The control word drives an adjustable capacitance bank that is part of the resonant circuit. During a receive mode of the transceiver, the control word value is held constant to substantially maintain resonance of the resonant circuit during operation of the receiver.

Method and apparatus for automatic tuning of a resonant loop antenna in a transceiver circuit

The present invention is directed toward a system and apparatus for digitally controlling a bias control signal for at least one transistor. The present invention provides for software writable registers that control the bias control signal. The present invention further provides for the bias control signal to be temperature compensated based upon a temperature signal and a temperature profile stored in software writable registers. The present invention further provides for software control of the initialization and configuration of the bias control signal through stored program control of the values in the software writable registers.

Systems and apparatus for digital control of bias for transistors

A method and circuit are shown for generating a higher order compensated bandgap voltage is disclosed, in which a first order compensated bandgap voltage and a linearly temperature dependent voltage are generated. Thereafter, a difference between the linearly temperature dependent voltage and the first order compensated bandgap voltage is generated. The resulting difference voltage is squared, and finally the squared voltage is added to the first order compensated bandgap voltage, resulting in a higher order compensated bandgap voltage. There is also disclosed a higher order temperature compensated bandgap circuit.

Method and circuit for generating a higher order compensated bandgap voltage

Disclosed is a circuit and method for continuous automatic tuning of a resonant circuit. A resonance voltage of the resonant circuit is phase shifted by a predetermined phase shift &#x3a6; degrees and an input voltage signal to a power amplifier driving the resonant circuit is phase shifted by &#x3a6;&#xb1;90 degrees to place the signals in quadrature. The phase shifted signals are mixed to obtain a error signal. The error signal is compared to a predetermined voltage range in order to generate control signals for a control word generator, such as an up-down counter. The control word generator produces a control word that drives a capacitance bank that is part of the resonant circuit. The present invention continuously automatically adjusts the capacitance of the capacitance bank to tune the resonant circuit.

Method and apparatus for automatic tuning of a resonant loop antenna

A variable frequency oscillator circuit comprising a resonator circuit part and an amplifier circuit part. The resonator circuit part has a first end and a second end, and it comprises a parallel connected inductor-capacitance pair. The amplifier circuit part comprises first and second transistors having a collector, base, and emitter. The amplifier circuit part further comprises a first impedance matching element connected between the base of the second transistor and the first end of the resonator circuit part, and a second impedance matching element connected between the base of the first transistor and the second end of the resonator circuit part. The impedance matching elements are inductors, namely the third inductor and the fourth inductor. The application of the inductors provides a noise-matched optimum source impedance for the active amplifier circuit part.

Low phase-noise integrated voltage controlled oscillator

Growing community of inventors

Dunakeszi, Hungary

János Erdélyi