Realtek Semiconductor Inc.

Hung-Han Chen

Hsiao-Tsung Yen

Ka-Un Chan

Po-Chih Wang

Chien-Jung Huang

Beng-Meng Chen

Jian-You Chen

A radio frequency apparatus includes a power amplifier circuit, a signal coupling circuit, an extraction circuit, and a harmonic filter circuit. The power amplifier circuit is configured to amplify a differential signal to output a to-be-filtered signal. The signal coupling circuit includes a primary side inductor and a secondary side inductor. The signal coupling circuit is configured to convert the to-be-filtered signal received by the primary side inductor into a single-ended signal outputted from the secondary side inductor. The extraction circuit has a center tap. The extraction circuit is configured to inductively couple to the primary side inductor and output a common mode signal from the center tap. The harmonic filter circuit is configured to perform a harmonic filtering on the single-ended signal according to the common mode signal, such that the secondary side inductor of the signal coupling circuit outputs a filtered signal.

Radio frequency apparatus and inductance device thereof

The present invention provides a calibration method of a transmitter, wherein the transmitter includes a power amplifier, a transformer, an adjusting circuit and a coupling circuit, wherein the power amplifier receives an input signal to generate an amplified input signal, the transformer receives the amplified input signal to generate an output signal, the adjusting circuit adjusts phase and amplitude of a common mode signal of the amplified input signal to generate a first signal, and the coupling circuit generates a coupled signal to the output signal according to the first signal. In addition, the calibration method includes: controlling the adjusting circuit to have a specific setting of the phase and amplitude adjustment for the common mode signal, to effectively eliminate a second harmonic generated due to the power amplifier, to improve electromagnetic interference and signal quality.

Transmitter and associated calibration method

An inductor device includes a first trace, a second trace, and a capacitor. The first trace includes a first and a second sub-trace. The first sub-trace includes first wires, and the second sub-trace includes second wires. The second sub-trace is coupled to the first sub-trace at a first node. The first and the second wires are disposed to each other in an interlaced manner, and located at an outer side of the inductor device. The second trace includes a third and a fourth sub-trace. The third sub-trace includes third wires, and the fourth sub-trace includes fourth wires. The fourth sub-trace is coupled to the third sub-trace at a second node. The third and the fourth wires are disposed to each other in an interlaced manner, and located at an outer side of the inductor device. The capacitor is coupled between the first and the second node.

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Hsinchu, Taiwan

Hung-Han Chen