Patent application number | Description | Published |
20120229199 | BANDGAP CIRCUIT AND START CIRCUIT THEREOF - A start circuit adapted to start a reference circuit including a plurality of bias nodes is provided. The start circuit includes a current source, a current minor, a load device, and a control device. The current source determines whether or not to generate an internal current according to a plurality of bias voltages on a part of the bias nodes. The current minor duplicates the internal current to produce a mirrored current. The load device adjusts a control voltage according to the mirrored current. The control device determines whether or not to generate a start voltage according to the control voltage, and transmits the start voltage to one of the part of the bias nodes, so as to break the reference circuit away from a zero-current state. | 09-13-2012 |
20130033301 | STRUCTURE OF OUTPUT STAGE - A structure of an output stage, and the structure includes a first electrode, a second electrode, a third electrode, a plurality of first auxiliary electrodes, a plurality of second auxiliary electrodes, a plurality of third auxiliary electrodes, a plurality of fourth auxiliary electrodes, a first switching unit, and a second switching unit. Wherein, a plurality of first currents flow through the turned-on first switching unit, and a first flowing direction of the first currents in the turned-on first switching unit is from the first electrode to the second electrode. A plurality of second currents flow through the turned-on second switching unit, and a second flowing direction of the second currents in the turned-on second switching unit is from the second electrode to the third electrode. | 02-07-2013 |
20130271231 | OSCILLATOR MODULE AND REFERENCE CIRCUIT THEREOF - A reference circuit for an oscillator module is provided. The reference circuit includes a reference voltage generation unit and a reference current generation unit. The reference voltage generation unit includes an electric element having a voltage proportional to absolute temperature (PTAT voltage) and provides a reference voltage based on the PTAT voltage. The reference current generation unit is coupled to the reference voltage generation unit and provides a reference current to the oscillator circuit to serve as an input current based on the PTAT voltage. The oscillator circuit generates a clock signal based on the reference voltage and the input current. The reference voltage and the input current are proportional to absolute temperature and have the same change trend relative to absolute temperature, such that the clock signal is a temperature insensitive signal. An oscillator module including an oscillator circuit and the foregoing reference circuit is also provided. | 10-17-2013 |
20130314835 | ADAPTIVE PROTECTION CIRCUIT MODULE FOR OPERATIONAL AMPLIFIER AND ADAPTIVE PROTECTION METHOD THEREOF - An adaptive protection circuit module for an operational amplifier including an over temperature protection circuit and an over current protection circuit is provided. The over temperature protection circuit provides a temperature protection function to power down the operational amplifier when an operating temperature of the operational amplifier increases higher than a first threshold temperature. The over current protection circuit provides a current protection function to limit an output current of the operational amplifier and adjusts the first threshold temperature to a second threshold temperature when the over current protection circuit is enabled. The second threshold temperature is lower than the first threshold temperature. After the first threshold temperature is adjusted to the second threshold temperature, the over temperature protection circuit powers down the operational amplifier when the operating temperature increases higher than the second threshold temperature. Furthermore, an adaptive protection method for the foregoing operational amplifier is also provided. | 11-28-2013 |
20140152375 | MULTIPLEXER AND DYNAMIC BIAS SWITCH THEREOF - A multiplexer and a dynamic bias switch thereof are provided. The dynamic bias switch includes a switch transistor and a dynamic bulk bias (DBB) unit. A first terminal and a second terminal of the switch transistor are respectively coupled to a first terminal and a second terminal of the dynamic bias switch. A bulk of the switch transistor is coupled to the DBB unit. The DBB unit selectively couples the first terminal or the second terminal of the switch transistor to the bulk of the switch transistor. | 06-05-2014 |
20140198421 | Over Temperature Protection Circuit - The present invention provides an over temperature protection circuit. The over temperature protection circuit includes a reference circuit and a hysteretic comparator. The reference circuit is used for generating a reference voltage and a changeable voltage. The changeable voltage is varied by temperature. The hysteretic comparator compares the reference voltage with the changeable voltage to output a power down signal. | 07-17-2014 |
20140361967 | VOLTAGE GENERATOR - A voltage generator for providing a plurality of output voltages having different levels includes: a reference block and a plurality of digital-to-analog conversion blocks. The reference block is employed for providing a plurality of reference voltages according to a supply voltage. The plurality of digital-to-analog conversion blocks is coupled to the reference block, and each of the digital-to-analog conversion blocks receives the reference voltages and generates a digital-to-analog output voltage according to a digital code, wherein digital-to-analog output voltages generated by the digital-to-analog conversion blocks have different levels, respectively. In addition, a range of the digital-to-analog output voltage generated by a first digital-to-analog conversion block of the digital-to-analog conversion blocks is different from that of the digital-to-analog output voltage generated by a second digital-to-analog conversion block. | 12-11-2014 |
20150339834 | Programmable Gamma Circuit for Gamma Correction - A programmable gamma circuit for gamma correction is disclosed. The programmable gamma circuit includes a string digital-to-analog converter, a first operational amplifier, and an output resistor string. The string digital-to-analog converter selects an analog voltage from a plurality of candidate voltages according to a digital reference code. An output terminal of the first operational amplifier outputs a first output voltage. A positive input terminal of the first operational amplifier is electrically connected to the string digital-to-analog converter for receiving the analog voltage. The output resistor string is divided into a first resistor part and a second resistor part by a connection terminal which is electrically connected to a negative input terminal of the first operational amplifier, and a resistance of the first resistor part is a multiple of a resistance of the second resistor part. | 11-26-2015 |