Mediatek Corporation

Jui-Chih Kao

Ming-Da Tsai

Po-Sen Tseng

Chien-Cheng Lin

Chih-Chun Hsu

Yuan-Yu Fu

A radio-frequency (RF) power amplifier includes a matching network comprising at least one matching network circuit corresponding to at least one symmetry node, at least one detector for detecting power of a detected signal at the symmetry node of the matching network, and generating at least one control signal according to the power of the detected signal, wherein the detected signal is an odd harmonic of an RF signal when the RF power amplifier operates in a differential mode or an even harmonic of the RF signal when the RF power amplifier operates in a common mode, and at least one adjusting circuit for adjusting the RF signal according to the at least one control signal.

Matching network circuit and radio-frequency power amplifier with odd harmonic rejection and even harmonic rejection and method of adjusting symmetry of differential signals

An integrated circuit apparatus includes a substrate, an IC chip disposed above the substrate, and an electromagnetic shielding layer disposed on a surface of the substrate. The IC chip includes an electromagnetic coupling device. The electromagnetic shielding layer and the electromagnetic coupling device partially overlap in a vertical projection direction of the surface of the substrate.

Integrated circuit apparatus

A frequency tunable filter and an associated apparatus are provided, where the frequency tunable filter may include a plurality of ports including an input port and an output port, and may further include an inductor-capacitor (LC) resonator, a switching unit that is coupled between the LC resonator and a ground terminal of the frequency tunable filter, and a resonance adjustment unit that is coupled between the LC resonator and the ground terminal. For example, the LC resonator may include a first terminal coupled to each of the input port and the output port, and may further include a second terminal, the switching unit may selectively provide a conduction path between the second terminal of the LC resonator and the ground terminal, and the resonance adjustment unit may selectively change a resonance characteristic of the LC resonator.

Frequency tunable filter with voltage stressed relaxed switch, and associated apparatus

A matching network circuit for RF power amplifier circuit capable of odd harmonic rejection and even harmonic rejection in the differential mode and the common mode, respectively. The matching network circuit includes a differential mode filter with a differential resonant frequency and a passive component coupled to a virtual short circuit node at the differential mode filter, wherein a common mode filter with a common resonant frequency includes the differential mode filter and the passive component. As a result, two notch filters with different resonant frequencies are utilized for the common mode and the differential mode, respectively.

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Taipei, Taiwan

Jui-Chih Kao