Patent application number | Description | Published |
20080224715 | LIGHT-DRIVING SYSTEM CAPABLE OF PROVIDING SIGNAL-MEASURED CALIBRATION AND A METHOD FOR PERFORMING THE SAME - This present invention discloses a light-driving system capable of providing an accurate calibration of signal measurement and a method for performing the same, including an automatic power control (APC) circuit which is pre-calibrated for a signal measurement process. By enlarging at least one measured pad of the APC circuit, multiple grounding paths are established via a plurality of probes of a test instrument. An impedance effect predicted on the contact between the probes and the pad is diminished greatly. A voltage value on the pad can be accurately measured. Thus, a reference voltage value input to a first input of a comparator of the APC circuit can be determined on a basis of a specific condition when a ramping voltage value input to a second input of the comparator is substantially equal to a sum of a predetermined reference voltage value and the voltage value of the pad. | 09-18-2008 |
20080265916 | METHOD OF PERFORMING SIGNAL-MEASURED CALIBRATION - This present invention discloses a method for performing an accurate calibration of signal measurement by a light-driving system including an automatic power control (APC) circuit which is pre-calibrated for a signal measurement process. By enlarging at least one measured pad of the APC circuit, multiple grounding paths are established via a plurality of probes of a test instrument. An impedance effect predicted on the contact between the probes and the pad is diminished greatly. A voltage value on the pad can be accurately measured. Thus, a reference voltage value input to a first input of a comparator of the APC circuit can be determined on a basis of a specific condition when a ramping voltage value input to a second input of the comparator is substantially equal to a sum of a predetermined reference voltage value and the voltage value of the pad. | 10-30-2008 |
20080279316 | METHOD AND APPARATUS FOR DATA RECEPTION - Method and apparatus for data reception are provided, retrieving digital values transmitted through a cable. In a data receiver, an equalizer equalizes an input signal based on a boost value to generate an equalized signal, and a data extractor samples the equalized signal to extract output values from each symbol period. The data extractor detects signal quality of the equalized signal to adjust the boost value accordingly. An optimal time point is detected within one symbol period where an output value is an ensured valid, and variation rate of the optimal time point is counted as an inverse indicator of the signal quality. | 11-13-2008 |
20090066419 | VARIABLE GAIN AMPLIFIER CIRCUITS - A variable gain amplifier circuit has a variable gain amplifier (VGA), a string of resistors, a plurality of gain switches, a current source, and at least two current switches. A first input terminal of the VGA receives an input voltage signal. The string of resistors are coupled between an output terminal of the VGA and a bias voltage input terminal. Each of the gain switches is coupled between a second input terminal of the VGA and one of connection nodes between two of the resistors. Each of the current switches is coupled between the current source and one of the connection nodes. The current source provides a current through the turned-on current switch. | 03-12-2009 |
20100127905 | METHOD FOR CALIBRATING ANALOG-TO-DIGITAL CONVERTING CIRCUITS - A method for calibrating at least one analog-to-digital converting circuits includes: during a wafer level probe testing or a chip level testing, inputting at least one calibration signal into the analog-to-digital converting circuit to generate at least one digital signal; and calibrating gain or offset of the analog-to-digital converting circuit according to at least the digital signal. | 05-27-2010 |
20110116652 | SIGNAL OUTPUT DEVICE AND SIGNAL OUTPUT METHOD - A signal output device includes: a control circuit for receiving at least a first input control signal and outputting an output control signal according to at least the first input control signal, wherein the first input control signal comprises a first signal segment followed by a second signal segment; and a driver circuit, operated according to a supply power, for receiving the output control signal from the control circuit and selectively generating an output signal according to the output control signal; wherein the supply power is turned on before the second signal segment of the first input control signal is received by the control circuit; when the supply power is turned on, the driver circuit operates under a specific power state; and when the second signal segment of the first input control signal is received by the control circuit, the driver circuit keeps operating under the specific power state. | 05-19-2011 |
20110175760 | METHOD FOR CALIBRATING ANALOG-TO-DIGITAL CONVERTING CIRCUITS - A method for calibrating at least one analog-to-digital converting circuit includes: during a wafer level probe testing, inputting at least one calibration signal provided by a wafer level testing machine into the analog-to-digital converting circuit to generate at least one digital signal; and calibrating the analog-to-digital converting circuit according to at least the digital signal. The analog-to-digital converting circuit is applied to a video system or an audio system. | 07-21-2011 |
20140258569 | SIGNAL PROCESSING SYSTEM AND ASSOCIATED METHOD - The present invention provides a signal processing system and associated method. The signal processing system includes converter(s) for conversion between digital and analog, each converter includes multiple serially coupled units forming multiple frequency interfaces respectively associating with different frequencies, and each converter is partitioned, at a selected frequency interface, to a first portion and a second portion respectively formed in the first chip and the second chip. The partitioning frequency interface is selected to reduce implement cost. | 09-11-2014 |