Abstract: A controller having a wireless transmission interface is provided. The controller includes an amplifier, an analog-to-digital converter, a digital filter, a processor, and a radio frequency signal transceiver. The amplifier is coupled to the wireless transmission interface, and generates an amplification signal according to an input signal. The analog-to-digital converter is coupled to the amplifier, and configured to convert the amplification signal into a digital format. The digital filter is coupled to the analog-to-digital converter, and configured to filter the amplification signal in the digital format to generate a filtered signal. The processor is coupled to the digital filter, and configured to perform a calculation on the filtered signal to generate a calculation result. The radio frequency signal transceiver is coupled to the processor, and obtains received information according to the calculation result and the filtered signal.

Abstract: A controller having a wireless transmission interface is provided. The controller includes an amplifier, an analog-to-digital converter, a digital filter, a processor, and a radio frequency signal transceiver. The amplifier is coupled to the wireless transmission interface, and generates an amplification signal according to an input signal. The analog-to-digital converter is coupled to the amplifier, and configured to convert the amplification signal into a digital format. The digital filter is coupled to the analog-to-digital converter, and configured to filter the amplification signal in the digital format to generate a filtered signal. The processor is coupled to the digital filter, and configured to perform a calculation on the filtered signal to generate a calculation result. The radio frequency signal transceiver is coupled to the processor, and obtains received information according to the calculation result and the filtered signal.

Abstract: A pulse width modulation (PWM) circuit includes a turn on/off switch and a PWM controller. The first terminal of the turn on/off switch is coupled to a turn off voltage. The control terminal of the turn on/off switch receives a turn on/off signal to decide whether the circuit between the first terminal and the second terminal of the turn on/off switch is turned on or not. The PWM controller includes a PWM pin and a turn on/off device. The PWM pin is coupled to the second terminal of the turn on/off switch to output a PWM signal. The turn on/off device is coupled to the PWM pin to decide the turn on/off of the PWM controller according to a signal swing state of the PWM pin.

Abstract: A control circuit for P-type power transistor. The P-type power transistor includes a gate coupled between an input voltage and an output voltage. A first switch is coupled between a first voltage and the gate. A current source provides a first current, and is coupled to a second voltage. A second switch is coupled between the first switch, the gate and the current source. The voltage level of the gate is determined according to the first current when the first switch is turned off and the second switch is turned on.