Abstract: Disclosed herein is a voltage regulator having a capacitive feed-forward ripple cancellation circuit, which includes a pass unit configured to transfer, in response to a control signal, an input voltage provided from an input terminal to an output voltage of an output terminal, an error amplification unit configured to output a comparison signal on the basis of a magnitude comparison result between the output voltage and a reference voltage, and a capacitive feed-forward ripple cancellation unit configured to remove a ripple included in the input voltage using the reference voltage and the comparison signal in order to generate the control signal. In accordance with the present invention, a circuit capable of removing power supply noise while consuming a low quiescent current through a capacitive feed-forward ripple cancellation technique can be provided.

Abstract: Disclosed herein is a low dropout (LDO) voltage regulator including an amplifier configured to receive a reference voltage through a negative input terminal, receive a feedback voltage through a positive input terminal, and amplify a difference between the feedback voltage and the reference voltage; a buffer which has an input connected to an output of the amplifier and an output and performs a buffering operation; a pass transistor configured to generate a driving current according to an output signal of the buffer; a voltage divider configured to form an output signal according to the driving current and generate a feedback voltage through a feedback resistor connected thereto; and a negative resistor circuit connected between the reference voltage and the feedback resistor and configured to generate a compensation current compensating for a loss current generated in the feedback resistor.

Abstract: Provided is a buck-boost converting circuit including an LED current regulator and bypass switches. The buck-boost converting circuit includes switches coupled in a matrix form in order to individually control a plurality of LEDs connected in series, an LED current regulator, and a circuit capable of buck-boost conversion.

Abstract: Provided is a buck-boost converting circuit including an LED current regulator and bypass switches. The buck-boost converting circuit includes switches coupled in a matrix form in order to individually control a plurality of LEDs connected in series, an LED current regulator, and a circuit capable of buck-boost conversion.

Abstract: Provided is a delta-sigma modulator having a differential output, the modulator including a switched-capacitor integrator configured to generate a non-inverted integral signal and an inverted integral signal and also including a switched-capacitor circuit configured to sample an input signal based on a control signal and to integrate the feedback signal and the input signal based on the control signal and also a feedback circuit configured to generate the feedback signal.

Abstract: Provided is a delta-sigma modulator having a differential output, the modulator including a switched-capacitor integrator configured to generate a non-inverted integral signal and an inverted integral signal and also including a switched-capacitor circuit configured to sample an input signal based on a control signal and to integrate the feedback signal and the input signal based on the control signal and also a feedback circuit configured to generate the feedback signal.

Abstract: An analog to digital converter may achieve an output sampling rate that is not an integer multiple of the system clock. This may be done without using the conventional phase-locked loop circuit that generally requires a longer design time, more testing, and more silicon area. A pseudo clock may be generated from the system clock in which some of the system clock pulses are disabled to achieve a pseudo clock with the desired effective frequency.

Abstract: A bandgap reference circuit includes at least one transistor, an amplifier and a start-up circuit. The amplifier is coupled to the transistor(s) to establish a bandgap reference voltage. The start-up circuit, in response to the bandgap reference circuit powering up, isolates an output terminal of the amplifier from at least one input terminal of the amplifier and supplies power to the transistor(s) via the output terminal.

Abstract: A bandgap reference circuit includes at least one transistor, an amplifier and a start-up circuit. The amplifier is coupled to the transistor(s) to establish a bandgap reference voltage. The start-up circuit, in response to the bandgap reference circuit powering up, isolates an output terminal of the amplifier from at least one input terminal of the amplifier and supplies power to the transistor(s) via the output terminal.

Abstract: An analog to digital converter may achieve an output sampling rate that is not an integer multiple of the system clock. This may be done without using the conventional phase-locked loop circuit that generally requires a longer design time, more testing, and more silicon area. A pseudo clock may be generated from the system clock in which some of the system clock pulses are disabled to achieve a pseudo clock with the desired effective frequency.

Abstract: A bandgap reference circuit utilizes chopper stabilization to reduce reference voltage variation caused by, for example, offset voltage and 1/f noise within an associated amplifier. The input signal of the amplifier is modulated using a high frequency modulation signal. The modulated signal is then amplified and demodulated. In one embodiment, a single-ended chopper amplifier having integrated amplification/demodulation functionality is provided.