Patent ID: 8766741
Filing Date: 2014-07-01
Classification: H01G,H03H,H03J

Abstract:
1. A circuit, comprising: a generator for generating a DC BIAS voltage whose magnitude is variable by the generator, the generator including switching means for periodically alternating a polarity of the DC BIAS voltage such that the generator produces an alternating DC voltage; a ceramic component having two electrodes, the properties of which component are set by the alternating DC voltage applied to the electrodes; wherein the circuit is an adaptive impedance matching circuit for matching a signal source to a load, wherein the ceramic component has a variable capacitance dependent on the alternating DC voltage applied to the electrodes, wherein the impedance matching is effected via the alternating DC voltage, wherein the ceramic component is connected to an RF signal source, the alternating DC voltage being superposed on the RF signal, wherein the generator is configured so as not to produce any frequencies that produce interfering intermodulation products with the RF signal, and wherein a maximum voltage range of DC voltage present in the alternating DC voltage is significantly larger than the RF voltage present in the RF signal.