Abstract: A switch circuit of an embodiment includes a radio-frequency switch and a level shifter circuit. The radio-frequency switch, which includes a first switch group and a second switch group each including a plurality of switches, switches transmission/reception of a radio-frequency signal. The level shifter circuit outputs a first signal for controlling ON/OFF of each switch of the first switch group and a second signal for controlling ON/OFF of each switch of the second switch group.

Abstract: A switch circuit of an embodiment includes a radio-frequency switch and a level shifter circuit. The radio-frequency switch, which includes a first switch group and a second switch group each including a plurality of switches, switches transmission/reception of a radio-frequency signal. The level shifter circuit outputs a first signal for controlling ON/OFF of each switch of the first switch group and a second signal for controlling ON/OFF of each switch of the second switch group.

Abstract: A switch circuit of an embodiment includes a high frequency switch, a first charge pump circuit, a boost signal generation circuit, and a second charge pump circuit. The high frequency switch switches transmission and reception of a high frequency signal. The first charge pump circuit generates a first voltage and a second voltage biased to the high frequency switch. When an edge of an input signal is detected, the boost signal generation circuit generates a first boost signal for temporarily increasing drive capacity of the first charge pump circuit. When the first boost signal is input, the second charge pump circuit operates to temporarily increase the drive capacity of the first charge pump circuit.

Abstract: A switch circuit of an embodiment includes a high frequency switch, a first charge pump circuit, a boost signal generation circuit, and a second charge pump circuit. The high frequency switch switches transmission and reception of a high frequency signal. The first charge pump circuit generates a first voltage and a second voltage biased to the high frequency switch. When an edge of an input signal is detected, the boost signal generation circuit generates a first boost signal for temporarily increasing drive capacity of the first charge pump circuit. When the first boost signal is input, the second charge pump circuit operates to temporarily increase the drive capacity of the first charge pump circuit.

Abstract: According to one embodiment, an IQ signal generation circuit includes an RC poly-phase filter, a resistive load circuit and the transconductance amplifier. The RC poly-phase filter has first to fourth input terminals and first to fourth output terminals. The first and second input terminals receive first signals with a phase difference of 0°. The third and fourth input terminals receive second signals with a phase difference of 180°. The first to fourth output terminals output signals with phase differences of 0°, 90°, 180° and 270°. The resistive load circuit is connected between the first to fourth output terminals and a power supply terminal. The transconductance amplifier is connected between the first to fourth input terminals and a reference voltage terminal. The transconductance amplifier receives input signals, amplifies the input signals and generates the amplified signals to the first to fourth input terminals.