Abstract: A push-pull power amplifier (PA) includes a pair of P-type transistors, a pair of N-type transistors, and a splitter, wherein source terminals of the pair of P-type transistors are coupled to a first reference voltage, source terminals of the pair of N-type transistors are coupled to a second reference voltage, and drain terminals of the pair of P-type transistors and drain terminals of the pair of N-type transistors are coupled to an output port of the push-pull PA. The splitter is arranged to receive a common-mode input pair, and provide two differential output pairs to the pair of P-type transistors and the pair of N-type transistors, wherein one of the two differential output pairs is provided to gate terminals of the pair of P-type transistors, and the other of the two differential output pairs is provided to gate terminals of the pair of N-type transistors.

Abstract: The present invention provides an integrated circuit for communication, e.g., for mobile radio-frequency (RF) telecommunication, including a resonator, a main amplifier, a matching circuit, a blocker detector, a mixer circuit, and a translation filter. The resonator provides conversion from single-end to differential, and filtering function for rejecting blockers at harmonics of local oscillation signal. The blocker detector detects occurrence of blocker; according to whether blocker exists, the main amplifier amplifies differential signal of the resonator by different gains, and the mixer circuit mixes amplified signal with different numbers of mixers. The translation filter contributes to rejection of blockers closed to in-band by providing a first pass band which is translated to a second pass band by the mixer circuit. The matching circuit provides impedance match.

Abstract: The present invention provides an integrated circuit for communication, e.g., for mobile radio-frequency (RF) telecommunication, including a resonator, a main amplifier, a matching circuit, a blocker detector, a mixer circuit, and a translation filter. The resonator provides conversion from single-end to differential, and filtering function for rejecting blockers at harmonics of local oscillation signal. The blocker detector detects occurrence of blocker; according to whether blocker exists, the main amplifier amplifies differential signal of the resonator by different gains, and the mixer circuit mixes amplified signal with different numbers of mixers. The translation filter contributes to rejection of blockers closed to in-band by providing a first pass band which is translated to a second pass band by the mixer circuit. The matching circuit provides impedance match.

Abstract: A mixer circuit. The mixer circuit comprises a double-balanced mixer and a carrier-leakage calibration cell. The double-balanced mixer has first and second input pairs whereby the first input pair receives the first differential input signal. The carrier-leakage calibration cell receives the second differential input signal and a differential calibration current and generates first and second output voltages to the second input pair of the double-balanced mixer.

Abstract: A mixer circuit. The mixer circuit comprises a double-balanced mixer and a carrier-leakage calibration cell. The double-balanced mixer has first and second input pairs whereby the first input pair receives the first differential input signal. The carrier-leakage calibration cell receives the second differential input signal and a differential calibration current and generates first and second output voltages to the second input pair of the double-balanced mixer.