Abstract: A current mirror with high output impedance for ensuring high accuracy current output comprises a first calibration circuit, a second calibration, a base circuit, a base current mirror, and an output circuit. The first calibration circuit further comprises plural MOS transistors and a first voltage. The second calibration circuit coupled with the first calibration circuit further comprises plural MOS transistors to calibrate the first calibration circuit. The base current mirror comprising two MOS transistors is coupled with both the first and the second calibration circuits via the base circuit. The output circuit with plural MOS transistors is coupled with the base circuit and the first calibration circuit. Upon an input current flows into the current mirror, the current mirror generates an output current which is several times in intensity than that of the input current.

Abstract: A folded R-2R ladder current-steering digital-to-analog converter is disclosed. In the folded R-2R ladder current-steering digital-to-analog converter, each node in the R-2R ladder is electrically coupled with a plurality of current sources with different weights. Therefore, the numbers of the resisters and current sources can be reduced, and efficient power saving and the high-speed operation can be achieved.

Abstract: A folded R-2R ladder current-steering digital-to-analog converter is disclosed. In the folded R-2R ladder current-steering digital-to-analog converter, each node in the R-2R ladder is electrically coupled with a plurality of current sources with different weights. Therefore, the numbers of the resisters and current sources can be reduced, and efficient power saving and the high-speed operation can be achieved.

Abstract: An LCD driving circuit and method for increasing effective bit(s) of the source driver is disclosed. A reference voltage generator generates a group of compensated reference voltage levels that are interlaced with original reference voltage level of original reference voltage generator. One of the multiple groups of reference voltage levels is selected by one or more least significant bits (LSBs), and is then inputted to digital-to-Analog converter of the source driver under control of the one or more least significant bits (LSBs), thereby effectively and economically enhancing the gray levels of the display on the LCD panel.

Abstract: A digital-to-analog converter includes: a resistor string; a plurality of first switches each connected between an output node and a corresponding one of first endmost, second endmost and intermediate nodes of the resistor string; a decoding unit adapted for converting a higher-order portion of a digital signal into a decoder signal used to control the first switches such that one of which is selected according to the higher-order portion to connect the corresponding one of the nodes to the output node; and first and second voltage-setting units adapted to be connected between one of first and second reference voltage sources and one of the first and second endmost nodes of the resistor string, and operable in response to a lower-order portion of the digital signal to adjust voltages at the first endmost, second endmost and intermediate nodes of the resistor string according to the lower-order portion of the digital signal.

Abstract: An LCD driving circuit and method for increasing effective bit(s) of the source driver is disclosed. A reference voltage generator generates a group of compensated reference voltage levels that are interlaced with original reference voltage level of original reference voltage generator. One of the multiple groups of reference voltage levels is selected by one or more least significant bits (LSBs), and is then inputted to digital-to-Analog converter of the source driver under control of the one or more least significant bits (LSBs), thereby effectively and economically enhancing the gray levels of the display on the LCD panel.

Abstract: A digital-to-analog converter includes: a resistor string; a plurality of first switches each connected between an output node and a corresponding one of first endmost, second endmost and intermediate nodes of the resistor string; a decoding unit adapted for converting a higher-order portion of a digital signal into a decoder signal used to control the first switches such that one of which is selected according to the higher-order portion to connect the corresponding one of the nodes to the output node; and first and second voltage-setting units adapted to be connected between one of first and second reference voltage sources and one of the first and second endmost nodes of the resistor string, and operable in response to a lower-order portion of the digital signal to adjust voltages at the first endmost, second endmost and intermediate nodes of the resistor string according to the lower-order portion of the digital signal.