Integration Associates Incorporated

Intergration Associates Inc.

Ferenc Mernyei

Attila Zólomy

Matthijs D Pardoen

János Erdélyi

Hendricus De Ruijter

Péter Onódy

András Hegyi

Gábor Tóth

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

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

Budapest, Hungary

Ferenc Mernyei