Abstract: A transceiver circuit including: a substrate; a signal coupler configured on the substrate and including a coiled first conductive layer pattern; and a notch filter configured on the substrate and including a coiled second conductive layer pattern; wherein each of the first conductive layer pattern and the second conductive layer pattern is arranged as a substantially symmetrical pattern with respect to a first virtual axis.

Abstract: An operational amplifier and a differential amplifying circuit thereof. The differential amplifying circuit receives a differential input signal and outputs a differential output signal. The differential amplifying circuit includes an output port that has a first terminal and a second terminal, the differential output signal being outputted via the first and second terminals; a first transistor pair receiving the differential input signal via two first ends and coupling to the first and second terminals respectively via two second ends; a second transistor pair receiving the differential input signal via two first ends and coupling to the first and second terminals respectively via two second ends; and a third transistor pair receiving a control signal via two first ends and coupling to the first and second terminals respectively via two second ends. The control signal controls the third transistor pair to switch on or off and/or controls the current flowing therethrough.

Abstract: An operational amplifier and a differential amplifying circuit thereof. The differential amplifying circuit receives a differential input signal and outputs a differential output signal. The differential amplifying circuit includes an output port that has a first terminal and a second terminal, the differential output signal being outputted via the first and second terminals; a first transistor pair receiving the differential input signal via two first ends and coupling to the first and second terminals respectively via two second ends; a second transistor pair receiving the differential input signal via two first ends and coupling to the first and second terminals respectively via two second ends; and a third transistor pair receiving a control signal via two first ends and coupling to the first and second terminals respectively via two second ends. The control signal controls the third transistor pair to switch on or off and/or controls the current flowing therethrough.

Abstract: A front-end circuit for a wireless communication system includes a first amplifier, a second amplifier and an antenna switch. The first amplifier is disposed at a receiving path, wherein the first amplifier has an input terminal and an output terminal, and the input terminal of the first amplifier is coupled to a first pad. The second amplifier is disposed at a transmission path, wherein the second amplifier has an input terminal and an output terminal, and the output terminal of the second amplifier is coupled to a second pad different from the first pad. The antenna switch is coupled between the input terminal of the first amplifier and the output terminal of the second amplifier.

Abstract: A front-end circuit for a wireless communication system includes a first amplifier, a second amplifier and an antenna switch. The first amplifier is disposed at a receiving path, wherein the first amplifier has an input terminal and an output terminal, and the input terminal of the first amplifier is coupled to a first pad. The second amplifier is disposed at a transmission path, wherein the second amplifier has an input terminal and an output terminal, and the output terminal of the second amplifier is coupled to a second pad different from the first pad. The antenna switch is coupled between the input terminal of the first amplifier and the output terminal of the second amplifier.