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| Number | Title | Issue Date |
| 8179293 | Programmable settling for high speed analog to digital converter In an embodiment, an apparatus and method reduces a calibration settling time in an analog-to-digital converter (ADC). The ADC has a reference voltage supply. The reference voltage supply has an output. A filter capacitor is coupled to the reference voltage supply o... | 05/15/2012 |
| 8169350 | Analog-digital converter chip and RF-IC chip using the same A wireless receiving circuit having an analog-digital converter of digital calibration type constituted by plural analog-digital converter units, shares portions about digital calibration, and applies the result of calibration of one analog-digital converter unit to... | 05/01/2012 |
| 8159378 | Analog-to-digital conversion method using RC time constant calibrator and analog-to-digital converter therefor An analog-to-digital conversion method using an RC time constant calibrator is provided. The method includes the operations of comparing a crossing time point at which a first reference signal and a second reference signal cross each other with a target time point a... | 04/17/2012 |
| 8154432 | Digital to analog converter (DAC) having high dynamic range A system having: a digital pre-distortion circuit fed by a digital signal for distorting the digital signal; a digital to analog converter (DAC) core section coupled to an output of the calibration circuit for converting the distorted digital signal into a correspon... | 04/10/2012 |
| 8154433 | Linearity correction circuit for voltage mode DAC A force/sense voltage-mode DAC coupled with multiple transconductance amplifiers that generate a correction current injected to a node in one of the DAC cells is discussed. The correction current injected into the DAC cell may reduce nonlinearity produced by biasing... | 04/10/2012 |
| 8144041 | Electronic device An electronic device includes a frequency variable circuit, a filter, and an output voltage decision circuit. The frequency variable circuit changes the sampling frequency of an analog-digital converter. The filter limits a pass band of an output signal of the analo... | 03/27/2012 |
| 8134486 | DAC calibration Mechanisms to calibrate a digital to analog converter (DAC) of an SDM (sigma delta modulator) are disclosed. An extra DAC element in addition to the DAC is used to function in place of a DAC element under calibration. A signal (e.g., a random sequence of −1 and +1... | 03/13/2012 |
| 8125360 | On-chip calibration method A system for the calibration of a programmable system-on-a-chip is described. More specifically, embodiments of the present invention relate to a system that calibrates a programmable analog block in a system-on-a-chip without the use of external components. ... | 02/28/2012 |
| 8125361 | Digital-to-analog converter (DAC) calibration system The present invention relates generally to a digital-to-analog converter (DAC) calibration. The present invention may be implemented by a DAC calibration system including a first current source, a first switch coupled to the first current source, a second current so... | 02/28/2012 |
| 8115661 | Automatic power control system for optical disc drive and method thereof A method and system for calibrating an initial driving signal for driving an optical pick-up head of an optical disk drive is provided. On one embodiment, said optical disk drive is utilized for reading or writing data on an optical disk, the optical disk includes a... | 02/14/2012 |
| 8111178 | Calibration method and related calibration apparatus for capacitor array A capacitor array includes a plurality of capacitor components each having a first node and a second node, and first nodes of the capacitor components are coupled to each other. A calibration method for the capacitor array utilizes a calibration capacitor component ... | 02/07/2012 |
| 8106800 | Self-calibrating signal reconstruction system An approach for calibrating a signal reconstruction system. A signal may be input to a low-pass filter. An output of the filter may be converted to a digital signal which goes to a processor which outputs a reconstruction of the signal to the filter. The reconstruct... | 01/31/2012 |
| 8106801 | Methods and apparatus for built in self test of analog-to-digital convertors An apparatus configured for built in self test (BiST) of analog-to-digital convertors (ADCs) is described. The apparatus includes an ADC to be tested. The apparatus includes a ramp generator. The ramp generator provides a voltage ramp to the ADC. The apparatus furth... | 01/31/2012 |
| 8102289 | Analog/digital converter and semiconductor integrated circuit device In the digital calibration technique of the conventional time-interleaved analog/digital converter, it is impossible to perform highly-accurate calibration that supports a high-speed sampling rate of the next-generation application and achieves a high resolution. Fo... | 01/24/2012 |
| 8098178 | Chip and system utilizing the same A system including a pulse generating module and a processing module is disclosed. The pulse generating module generates a target signal. The processing module outputs a processing signal according to the target signal. Throughput of the target signal exceeds throug... | 01/17/2012 |
| 8094050 | Bandwidth mismatch estimation in time-interleaved analog-to-digital converters With high speed, high resolution time-interleaved (TI) analog-to-digital converters (ADCs), bandwidth mismatches between the various ADC branches can pose a significant problem. Previously, though, no adequate solution has been found. Here, a method and apparatus ar... | 01/10/2012 |
| 8089380 | Voltage mode DAC with calibration circuit using current mode DAC and ROM lookup The invention is a novel scheme of calibrating a voltage-mode digital to analog converter using a current-mode digital to analog converter. A DAC system is comprised of a voltage-mode DAC with an R-2R architecture structure and includes a ROM lookup table where cali... | 01/03/2012 |
| 8081096 | Signal generating apparatus and test apparatus Provided is a signal generating apparatus comprising a DA converter that outputs an output signal corresponding to input data supplied thereto; a sample/hold unit that is provided between the DA converter and an output end of the signal generating apparatus, and tha... | 12/20/2011 |
| 8081097 | Analog-to-digital converter and related calibrating comparator An analog-to-digital converter includes a sample and hold unit, a successive control unit, a look-up memory, and a calibrating comparator, which further includes a positive input end, a negative input end, a timing signal input end, a data port, a latch unit, an ena... | 12/20/2011 |
| 8072361 | Time-to-digital converter with built-in self test Apparatuses and methods related to time-to-digital converters (TDCs) are herein described. Generally, a time-to-digital converter is a device which measures a time period or time interval and outputs a digital value representing the measured time period. In an imple... | 12/06/2011 |
| 8063804 | Switching unit for generating an output voltage as a function of a digital data value and method for calibrating the switching unit With analog output stages of digital systems, the relationship between a digital data value, which is assigned to an analog output stage and to an actually generated output voltage, often does not correspond to a desired characteristic curve. A switching unit is pro... | 11/22/2011 |
| 8049650 | Method for testing a high-speed digital to analog converter based on an undersampling technique A method for testing a digital to analog converter, which operates in an undersampling environment, wherein signals of a tested DAC and a signal generator are modulated by a PWM device and then processed by a digital processing circuit to generate a digital signal, ... | 11/01/2011 |
| 8035538 | Sigma-delta conversion circuit suitable for photocurrent measurement applications A sigma-delta converter suitable for measuring a photocurrent comprises an input node adapted to receive a current to be measured (Imeas), a capacitor connected to the input node, a clocked comparator coupled to the input node and to a reference voltage V... | 10/11/2011 |
| 8031092 | Dual-mode based digital background calibration of pipelined ADCs for gain variations and device mismatches Methods and systems are described relating to dual-mode based digital background calibration of pipelined ADCs, for gain variations and device mismatches. Errors caused by gain insufficiency, nonlinearity, and capacitor mismatches are corrected by operating one ADC ... | 10/04/2011 |
| 7994953 | Method and module with analog-to-digital converter A method and module with analog-to-digital converter. One embodiment provides for testing an analog-to-digital converter, including generating a voltage ramp. The voltage ramp is converted to a digital signal using the ADC at a rate of a clock signal. A first parame... | 08/09/2011 |
| 7994954 | Calibration circuit and associated method A calibration circuit and method suitable for black level calibration in image processing, the circuit comprising an analogue gain amplifier, an analogue to digital converter; a correction circuit for receiving a digital signal and providing a digital offset signal;... | 08/09/2011 |
| 7986254 | Auto-measurement and calibration of DC resistance in current sensing applications The present invention pertains to calibration in current sensing applications. Power conversion systems such as those used in computer architectures may employ step down converters such as buck converters or other types of converters. The present invention provides ... | 07/26/2011 |
| 7982642 | Method for testing nonlinearity error of high speed digital-to-analog converter A novel method applies the down-conversion sampling technology to test a high-speed digital-to-analog conversion. In the method, a digital-to-analog conversion output signal of a high-speed digital-to-analog converter and a low-frequency sinusoidal carrier wave sign... | 07/19/2011 |
| 7978104 | Compensation of mismatch errors in a time-interleaved analog-to-digital converter A method for the compensation of frequency-response mismatch errors in M-channel time-interleaved ADCs. The compensation is done utilizing a technique that makes use of a number of fixed filters, that approximate differentiators of different orders, and a few variab... | 07/12/2011 |
| 7978105 | Current sensing and background calibration to match two resistor ladders In one embodiment, a first resistor ladder includes a first voltage across the first resistor ladder. A second resistor ladder includes a second voltage across the second resistor ladder. A third resistor ladder includes a third voltage across the third resistor lad... | 07/12/2011 |
| 7969335 | Digital correction of nonlinearity errors of multibit delta-sigma digital to analog converters Digital correction of multibit ADAC nonlinearities for error feedback DACs is provided. The integral nonlinearity (INL) error of the multibit ADAC is estimated (on line or off line) by a low-resolution calibration ADC (CADC) and stored in a random-access memory (RAM... | 06/28/2011 |
| 7961124 | Timing loop based on analog to digital converter output and method of use A device and process to compensate for asymmetrical qualities of an analog input signal, if present, and generate a timing signal. The timing signal is then used for analog to digital conversion. ... | 06/14/2011 |
| 7956777 | Method, system and apparatus for dual mode operation of a converter Methods, systems and apparatuses for operating a converter or other circuits are disclosed. More particularly, in one embodiment a converter or other circuit can be operated in two modes which may include the count-to-time and time-to count modes to determine an out... | 06/07/2011 |
| 7948409 | Automatic power control system for optical disc drive and method thereof A method for calibrating an initial driving signal for driving an optical pick-up head of an optical disk drive is provided. On one embodiment, said optical disk drive is utilized for reading or writing data on an optical disk, the optical disk comprises a plurality... | 05/24/2011 |
| 7940199 | 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... | 05/10/2011 |
| 7940200 | Calibration method, A/D converter, and radio device There is disclosed a calibration method for an A/D converter. The A/D converter includes a first amplifier to amplify first and second voltage signals, a second amplifier to amplify the first and second voltage signals amplified by the first amplifier, and a compara... | 05/10/2011 |
| 7932844 | Circuits and methods for calibrating a frequency response of a filter In one embodiment, the present invention includes an integrated circuit comprising a radio frequency communication channel having a mixer and a programmable analog filter coupled to an output terminal of the mixer. The integrated circuit further comprises a digital-... | 04/26/2011 |
| 7932845 | Pilot-tone calibration for time-interleaved analog-to-digital converters A self-calibrating analog-to-digital converter (ADC). The ADC includes multiple component ADCs to generate respective digital representations of an input signal in response to respective timing signals that are offset in phase from one another, each component ADC ha... | 04/26/2011 |
| 7916051 | Bandwidth mismatch estimation for time interleaved ADCs With high speed, high resolution time-interleaved (TI) analog-to-digital converters (ADCs), bandwidth mismatches between the various ADC branches can pose a significant problem. Previously, though, no adequate solution has been found. Here, a method and apparatus ar... | 03/29/2011 |
| 7911365 | Apparatus and method for analog-to-digital converter calibration An analog-to-digital converter (ADC) is provided. The ADC includes a reference voltage generator configured to generate reference voltages, an analog to digital converter core configured to receive an input signal and the reference voltages and to generate a digital... | 03/22/2011 |
