Realtek Semiconductor Inc.

Kuan-Hao Tseng

Ka-Un Chan

Po-Chih Wang

The present invention discloses a signal output circuit having anti-interference mechanism. An amplifier is electrically coupled to a power supply and a ground terminal through a first and a second amplifier bond wires, and generates an amplified output signal. A transformer circuit includes a transformer performing impedance transformation on the amplified output signal to generate a transformed output signal and a voltage-stabilizing capacitor suppressing second-order harmonics of the amplifier. A power-terminal side anti-interference circuit includes a power-terminal side bond wire and a power-terminal side anti-interference capacitor. The power-terminal side bond wire is electrically coupled to the ground terminal. The power-terminal side anti-interference capacitor is electrically coupled between the power-terminal side bond wire and the first amplifier bond wire, to cooperate with the power-terminal side bond wire, to filter out a first-order harmonics coupling signal coupled to the first amplifier bond wire by the transformed output signal generated by the transformer circuit.

Signal output circuit and method

An output power linearization method, suitable for a calibration system, includes the following operations: providing an instruction signal, which corresponding to a currently ideal output power among multiple ideal output powers, to an emission module of the calibration system so that the emission module outputs a radio frequency (RF) signal with a practical output power according to the instruction signal; obtaining a feedback signal, by a feedback circuit of the calibration system, from an output terminal of the emission module, and calculating a feedback output power from the feedback signal; calculating an output difference between the currently ideal output power and the feedback output power; if an absolute value of the output difference is larger than an absolute value of a feedback error of the feedback circuit, adjusting a present gain of the emission module so that the practical output power approaches the currently ideal output power.

Growing community of inventors

Hsinchu, Taiwan

Kuan-Hao Tseng