Method and apparatus for automatic tuning of a resonant loop...

Telecommunications – Transmitter – Including tuning

Reexamination Certificate

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Details

C455S121000, C455S123000, C455S115100, C333S017300, C333S124000, C343S860000, C343S861000

Reexamination Certificate

active

07058372

ABSTRACT:
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 Φ degrees and an input voltage signal to a power amplifier driving the resonant circuit is phase shifted by Φ±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.

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