Abstract: A termination circuit, including a termination resistor, a first switch circuit, a second switch circuit, and a control circuit, is provided. A first end of the termination resistor is coupled to a signal pad. A first end of the first switch circuit is coupled to a second end of the termination resistor. A first end of the second switch circuit is coupled to a second end of the first switch circuit. A second end of the second switch circuit is coupled to a reference voltage line. During a period when the second switch circuit is turned on, the control circuit turns on the first switch circuit with a bias voltage. During a period when the second switch circuit is turned off, the control circuit turns off the first switch circuit with a voltage of the first end of the first switch circuit.

Abstract: A termination circuit, including a termination resistor, a first switch circuit, a second switch circuit, and a control circuit, is provided. A first end of the termination resistor is coupled to a signal pad. A first end of the first switch circuit is coupled to a second end of the termination resistor. A first end of the second switch circuit is coupled to a second end of the first switch circuit. A second end of the second switch circuit is coupled to a reference voltage line. During a period when the second switch circuit is turned on, the control circuit turns on the first switch circuit with a bias voltage. During a period when the second switch circuit is turned off, the control circuit turns off the first switch circuit with a voltage of the first end of the first switch circuit.

Abstract: A control circuit for a current switch of a current digital to analog converter (DAC) includes a first inverter, a second inverter, a first pull-low switch, a second pull-low switch and a timing synchronization circuit. The first inverter includes an input terminal and an output terminal. The second inverter includes an input terminal and an output terminal, wherein the input terminal of the second inverter is coupled to the output terminal of the first inverter, and the output terminal of the second inverter is coupled to the input terminal of the first inverter. The first pull-low switch is coupled to the input terminal of the first inverter. The second pull-low switch is coupled to the input terminal of the second inverter. The timing synchronization circuit is coupled to the first pull-low switch and the second pull-low switch.

Abstract: A signal coupling circuit for generating an output signal according to an input signal is provided. The signal coupling circuit includes: a coupling capacitor, configured to generate a coupling signal according to the input signal; a clock generating circuit, configured to generate a clock and determine a duty cycle of the clock by the coupling capacitor; a discharge circuit, configured to intermittently discharge the coupling capacitor according to the duty cycle of the clock; and an output circuit, coupled to the coupling capacitor, for generating the output signal according to the coupling signal.

Abstract: A signal coupling circuit for generating an output signal according to an input signal is provided. The signal coupling circuit includes: a coupling capacitor, configured to generate a coupling signal according to the input signal; a clock generating circuit, configured to generate a clock and determine a duty cycle of the clock by the coupling capacitor; a discharge circuit, configured to intermittently discharge the coupling capacitor according to the duty cycle of the clock; and an output circuit, coupled to the coupling capacitor, for generating the output signal according to the coupling signal.