Abstract: A current sensing circuit includes a filtering circuit, an amplifier, a first resistor, a first transistor and a second transistor. The filtering circuit is coupled to two terminals of a sensing resistor. The amplifier has a first input terminal, a second input terminal and an output terminal. The second input terminal is coupled to the filtering circuit. The first resistor is coupled between the filtering circuit and the first input terminal of amplifier. A control terminal of the first transistor is coupled to the output terminal of amplifier, and its first terminal is coupled to the first input terminal of amplifier and its second terminal is grounded through a second resistor. A control terminal of the second transistor is coupled to the output terminal of amplifier, and its first terminal is coupled to the second input terminal of amplifier and its second terminal is grounded through a third resistor.

Abstract: A current sensing circuit includes a filtering circuit, an amplifier, a first resistor, a first transistor and a second transistor. The filtering circuit is coupled to two terminals of a sensing resistor. The amplifier has a first input terminal, a second input terminal and an output terminal. The second input terminal is coupled to the filtering circuit. The first resistor is coupled between the filtering circuit and the first input terminal of amplifier. A control terminal of the first transistor is coupled to the output terminal of amplifier, and its first terminal is coupled to the first input terminal of amplifier and its second terminal is grounded through a second resistor. A control terminal of the second transistor is coupled to the output terminal of amplifier, and its first terminal is coupled to the second input terminal of amplifier and its second terminal is grounded through a third resistor.

Abstract: A measuring current generation circuit coupled to a setting resistor is disclosed. The generation circuit includes a first measuring terminal, a second measuring terminal, a first transconductance amplifier, a second transconductance amplifier and an output circuit. The first transconductance amplifier has a first input terminal and a second input terminal. The first input terminal is coupled to one terminal of the setting resistor. The second input terminal is coupled to another terminal of the setting resistor and coupled to the first measuring terminal. The second transconductance amplifier has a third input terminal and a fourth input terminal. The output circuit is coupled to output terminals of the first transconductance amplifier and the second transconductance amplifier respectively and has a first output terminal and a second output terminal. The first output terminal is coupled to the first input terminal. The second output terminal is coupled to the second measuring terminal.

Abstract: A measuring current generation circuit coupled to a setting resistor is disclosed. The generation circuit includes a first measuring terminal, a second measuring terminal, a first transconductance amplifier, a second transconductance amplifier and an output circuit. The first transconductance amplifier has a first input terminal and a second input terminal. The first input terminal is coupled to one terminal of the setting resistor. The second input terminal is coupled to another terminal of the setting resistor and coupled to the first measuring terminal. The second transconductance amplifier has a third input terminal and a fourth input terminal. The output circuit is coupled to output terminals of the first transconductance amplifier and the second transconductance amplifier respectively and has a first output terminal and a second output terminal. The first output terminal is coupled to the first input terminal. The second output terminal is coupled to the second measuring terminal.

Abstract: A filter and an operating method thereof are provided. The filter includes a logic circuit, a power circuit and a filter circuit. The logic circuit provides a switching control signal. The power circuit is coupled to the logic circuit. The filter circuit is coupled to the power circuit and the logic circuit. The filter circuit includes an amplifier, a first capacitor and a first transistor. An output end of the amplifier is coupled to the logic circuit, and provides an output signal. The first capacitor is coupled between an input end and output end of the amplifier. The first transistor is connected in parallel with the first capacitor. A control end of the first transistor is coupled to the power circuit. The logic circuit provides a switching control signal to the power circuit according to the output signal. The power circuit supplies a control voltage to the first transistor according to the switching control signal.

Abstract: A filter and an operating method thereof are provided. The filter includes a logic circuit, a power circuit and a filter circuit. The logic circuit provides a switching control signal. The power circuit is coupled to the logic circuit. The filter circuit is coupled to the power circuit and the logic circuit. The filter circuit includes an amplifier, a first capacitor and a first transistor. An output end of the amplifier is coupled to the logic circuit, and provides an output signal. The first capacitor is coupled between an input end and output end of the amplifier. The first transistor is connected in parallel with the first capacitor. A control end of the first transistor is coupled to the power circuit. The logic circuit provides a switching control signal to the power circuit according to the output signal. The power circuit supplies a control voltage to the first transistor according to the switching control signal.

Abstract: A self-calibration circuit and method for capacitors are provided. A capacitor array is calibrated to approximate a reference capacitor according to an average parameter generated by calibrating the capacitor array multiple times. Since the capacitance of the compensation capacitor required to be connected to the target capacitor in parallel is determined according to the average parameter generated by performing the calibration multiple times, the error caused by a single calibration can be reduced, and meanwhile the calibration error caused by a reference voltage error or noise is reduced.

Abstract: A voltage regulator includes a comparator, a first voltage output unit, a second voltage output unit, a third voltage output unit, a first switch and a second switch. The voltage regulator receives an operating voltage and a reference voltage generated by a reference voltage generator, and then outputs a corresponding output voltage. The voltage regulator of the present invention can provide an operation mode, a suspend mode and a standby mode and can be switched among these modes to provide corresponding current driving capacity for respective operation states. When in the operation mode, the voltage regulator can supply a great current. When in the suspend mode, the voltage regulator consumes less power. When in the standby mode, the voltage regulator consumes even less power.

Abstract: A self-calibration circuit and method for capacitors are provided. A capacitor array is calibrated to approximate a reference capacitor according to an average parameter generated by calibrating the capacitor array multiple times. Since the capacitance of the compensation capacitor required to be connected to the target capacitor in parallel is determined according to the average parameter generated by performing the calibration multiple times, the error caused by a single calibration can be reduced, and meanwhile the calibration error caused by a reference voltage error or noise is reduced.

Abstract: A voltage regulator includes a comparator, a first voltage output unit, a second voltage output unit, a third voltage output unit, a first switch and a second switch. The voltage regulator receives an operating voltage and a reference voltage generated by a reference voltage generator, and then outputs a corresponding output voltage. The voltage regulator of the present invention can provide an operation mode, a suspend mode and a standby mode and can be switched among these modes to provide corresponding current driving capacity for respective operation states. When in the operation mode, the voltage regulator can supply a great current. When in the suspend mode, the voltage regulator consumes less power. When in the standby mode, the voltage regulator consumes even less power.

Abstract: A rational number frequency multiplier circuit and a method for generating rational number multiple frequency are disclosed. The circuit receives a plurality of input signals having the same frequency and different phase, and outputs at least one multiple frequency signal. The rational number frequency multiplier circuit includes a frequency divider module, for receiving and dividing the input signals to output frequency-divided signals having the same frequency and different phase; a first phase synthesis module and a second phase synthesis module for receiving and synthesizing the frequency-divided and input signals respectively into a plurality of first pulse period signals and second pulse period signals; and an adder for receiving and combining the first pulse period signals and the second pulse period signals into the multiple frequency signal according to the desired multiplication of the frequency.

Abstract: An electronic device for determining a type of a memory includes a comparator and a reset controller. The comparator for generating a discrimination signal according to a reference voltage and a first voltage of the memory, includes a first input end for receiving the first voltage, a second input end for receiving the reference voltage, a logic circuit coupled to the first input end and the second input end, for comparing the first voltage and the reference voltage so as to generate the discrimination signal, and an output end coupled to the logic circuit, for outputting the discrimination signal. The reset controller is used for determining the type of the memory according to the discrimination signal.

Abstract: A rational number frequency multiplier circuit and a method for generating rational number multiple frequency are disclosed. The circuit receives a plurality of input signals having the same frequency and different phase, and outputs at least one multiple frequency signal. The rational number frequency multiplier circuit includes a frequency divider module, for receiving and dividing the input signals to output frequency-divided signals having the same frequency and different phase; a first phase synthesis module and a second phase synthesis module for receiving and synthesizing the frequency-divided and input signals respectively into a plurality of first pulse period signals and second pulse period signals; and an adder for receiving and combining the first pulse period signals and the second pulse period signals into the multiple frequency signal according to the desired multiplication of the frequency.