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| Number | Title | Issue Date |
| 8094055 | Compact digital-to-analog converter A digital-to-analog converter is disclosed. An example digital-to-analog converter circuit includes a reference scaling circuit coupled to receive a first reference current. The reference scaling circuit is coupled to generate a second reference current in response ... | 01/10/2012 |
| 8085178 | Multiplying-adding return to zero digital to analog converter circuit and method A digital to analog converter (DAC) method and apparatus employs a multiplying-adding DAC, eliminating digital adder circuitry. Examples are given for multiplying a 3-bit binary number by a 2-bit binary number; however, there are no limitations to the bit-widths of ... | 12/27/2011 |
| 7924201 | Current output type digital-analog conversion circuit, and graphic display device A current output type digital-analog conversion circuit which outputs a current signal includes a decoder for decoding higher-order bits of input digital data, a plurality of binary current generators, and a current adder. Each of the binary current generators inclu... | 04/12/2011 |
| 7903016 | High power and high frequency gallium nitride based digital to analog converter for direct digital radio frequency power waveform synthesis A high power digital to analog converter (DAC) includes (a) an array of n bipolar transistors arranged in a binary sequence, (b) a depletion mode FET and (c) an array of n switches. The collector terminals of each bipolar transistor in the array are tied together. F... | 03/08/2011 |
| 7760121 | Dual data weighted average dynamic element matching in analog-to-digital converters Methods and systems to provide dynamic element matching (DEM) in multi-phase sample systems include multiple uncorrelated, dual data weighted averaging, dynamic element matching (DDWA DEM). DDWA DEM may be implemented in a multiple-phase sample system in which sampl... | 07/20/2010 |
| 7728750 | Display panel driver A display panel driver including a binary-weighted current-type D/A converter and a source follower with current mirror is provided. The binary-weighted current-type D/A converter receives n input signals and sends a D/A output voltage signal based on 2n... | 06/01/2010 |
| 7623055 | Weight level generating method and device utilizing plural weights at different time rates A weight level generator is provided. Weight level generator W has plural weight generators 5-1-5-j. At least one of said plural weight generators is used at at least two different time rates. Also, a digital-to-analog converter (DAC) usi... | 11/24/2009 |
| 7495594 | D/A converter and liquid crystal display device A D/A converter with reduced power consumption is offered by reducing an amount of electric charges that is charged and discharged as D/A conversion is performed. A terminal of each of four capacitors C1, C2, C3 and C4 is connected to a c... | 02/24/2009 |
| 7417572 | Voltage interpolation in digital-to-analog signal conversion A multiple-input follower amplifier is coupled through a configuration of switching devices to an upper reference voltage at a number of its inputs and to a lower reference voltage at the remaining number of its inputs to form a voltage interpolator. The output of t... | 08/26/2008 |
| 7394414 | Error reduction in a digital-to-analog (DAC) converter In a method to improve error reduction in a digital-to-analog converter (DAC), comprising a mapping matrix block and a plurality of selectable source units which supply signals that in combination provide for analog output signals, mapping input signals, obtained fr... | 07/01/2008 |
| 7369077 | Differential current-steering digital-to-analog converter Differential, current-steering DACs with reduced small signal differential non-linearity. A set of binary-weighted steerable constant current generators is used in which each constant current generator comprises a ternary constant current generator configured to gen... | 05/06/2008 |
| 7369075 | Output circuit, digital/analog circuit and display apparatus An output circuit, a digital/analog conversion circuit and a display apparatus can reduce the number of required input voltages and the number of transistors to save the necessary area. The output circuit and the digital/analog conversion circuit comprise a selectio... | 05/06/2008 |
| 7348912 | High resolution and low consumption digital-to-analog converter A digital-to-analog converter includes a first section (MSB) that converts the more significant bits of a digital code into a first voltage (Vin) of a multiplicity of discrete voltages that are integral multiples of a predetermined first voltage step (ΔV1). ... | 03/25/2008 |
| 7345612 | Digital-to-radio frequency conversion device, chip set, transmitter, user terminal and data processing method The invention relates to a device for digital-to-radio frequency conversion, the device comprising: conversion cell matrices for digital-to-radio frequency conversion; means for providing a digital data signal; means for dividing the digital data signal into data si... | 03/18/2008 |
| 7342528 | Circuit and method for reducing electromagnetic interference A spread spectrum system having a self-oscillating delay-line digital pulse width modulator and a method for mitigating electromagnetic interference. The spread spectrum system has a pseudo-random pattern generator connected to a digital-to-analog converter, which i... | 03/11/2008 |
| 7342527 | Digital-to-analog converting circuit, data driver and display device Disclosed is a digital-to-analog converting circuit including: a reference voltage generating circuit for outputting a plurality of reference voltages having voltage values that differ from one another; a data input control circuit for exercising control based upon ... | 03/11/2008 |
| 7330066 | Reference voltage generation circuit that generates gamma voltages for liquid crystal displays A gamma voltage generation circuit coupled to a digital-to-analog converter and provides the digital-to-analog converter with reference voltages by voltage division through resistor circuits. A variable voltage source can be modulated and charge-sharing switches can... | 02/12/2008 |
| 7321634 | Method and apparatus for variable sigma-delta modulation A method and apparatus for modulating a digital input signal is disclosed. The digital input signal is partitioned into a less-significant bit signal and a more-significant bit signal. A lower-order modulation of the less-significant bit signal is performed to gener... | 01/22/2008 |
| 7312739 | Communication driver An Ethernet controller includes a decoder, and T sets of transmit circuits. Each set of transmit circuits receives one of T decoded signals from the decoder, and includes a digital-to-analog converter (DAC) that provides a transmit output signal, and a replica circu... | 12/25/2007 |
| 7307567 | Digital-analog converter and digital-analog conversion method The present invention provides a digital-analog converter having: a DEM logic device (10) for generating at least two digital output data items (13, 14) from the digital input data (11) on the basis of a predetermined algorithm to determine an i... | 12/11/2007 |
| 7304593 | Linearization circuit with digital element matching for digital-to-analog converters A linearization circuit with digital element matching for digital-to-analog converters includes an n-bit delta-sigma modulator that receives an input signal and provides a modulated n-bit signal. An encoder receives the modulated n-bit signal and provides an encoded... | 12/04/2007 |
| 7265698 | Multi-stage digital-to-analog converter A multi-stage digital-to-analog converter has been presented. The multi-stage digital-to-analog converter may include a first digital-to-analog stage to output a first voltage and a second voltage in response to a first portion of a digital value, the first voltage ... | 09/04/2007 |
| 7256720 | Output filter for delta sigma modulator and digital signal processor provided with the same The invention intends to reduce noises by resistors in an output filter for a delta sigma modulator. The output filter uses an FIR filter with constant current sources as the current source, extracts output data of the delta sigma modulator from each taps of a shift... | 08/14/2007 |
| 7250883 | A/D converter A compact and highly accurate A/D converter includes series-connected computation cells, the number of which is equal to the number for bits in an output signal. The first computation cell includes a first comparison unit for subtracting a reference current from a f... | 07/31/2007 |
| 7236115 | Distributed current sources for folding ADC amplifier stages A circuit for reducing the maximum magnitude of the total current on each of a plurality of buses for an amplifier stage in a folding analog to digital converter. Each amplifier stage bus couples multiple transconductance circuits to a load. Also, each of the transc... | 06/26/2007 |
| 7227485 | Waveform control circuit The waveform conform control circuit includes a waveform generator, an amplitude adjustment device and an offset device. The waveform generator produces a current waveform. The amplitude adjustment device receives amplitudes amplitude data and produces a predetermin... | 06/05/2007 |
| 7227483 | High-speed and high-accuracy digital-to-analog converter A high-speed, high-accuracy DAC has multiple current switches. Each current switch includes a current source that provides a reference current, first and second circuit elements that couple to the current source, and first and second transistors that couple to the f... | 06/05/2007 |
| 7221292 | Circuit for producing a data bit inversion flag A circuit for producing a data bit inversion flag comprises a first summed-current production unit for producing a first summed current, whose amplitude is proportional to the number of different data bits in two adjacent data words in a data burst, a second summed-... | 05/22/2007 |
| 7209001 | Offset compensation circuit for a monitoring photodiode Disclosed is a circuit for compensating for an offset voltage of a monitoring photodiode. After the offset voltage is measured in a photodiode test, current source and offset resistors are added according to the measured resistances, thereby compensating for the off... | 04/24/2007 |
| 7202744 | Transresistance amplifier A transresistance amplifier circuit includes an input terminal receiving an input current, an output terminal providing an output voltage indicative of the input current, a first bias current source providing a first bias current to the input terminal, a first trans... | 04/10/2007 |
| 7183958 | Sub-ranging digital to analog converter for radiofrequency amplification An apparatus and method for amplifying a radiofrequency signal using a main Digital to Analog Converter (RFDAC) and a subordinate Digital to Analog Converter (Sub-DAC). The main RFDAC provides a first portion of a N-bit digital output, which specifies the amplificat... | 02/27/2007 |
| 7176825 | Data-converting circuit, data-converting method, and digital-to-analog converter using the same A data converting method is realized by a data-converting circuit including: a data combining circuit for outputting 1st through (2n−1)th intermediate data bits by combining data bits corresponding to “1”s in n-bit binary data ... | 02/13/2007 |
| 7164343 | Digital potentiometer A variable potentiometer with a wiper terminal and first and second terminals has relay switches for shorting or for unshorting resistors. When resistance is reduced between the wiper and one of said terminals, resistance is increased between the wiper and another t... | 01/16/2007 |
| 7132966 | Floating point IDAC Circuits and methods to convert a digital floating-point number into an analog current have been achieved. The conversion is performed directly by using an exponential current digital-to-analog converter (DAC) and a cascaded linear current digital-to-analog converte... | 11/07/2006 |
| 7132970 | Delay equalized Z/2Z ladder for digital to analog conversion A Z/2Z ladder network includes an R/2R ladder network having capacitors coupled across series resistors within the R/2R ladder network, wherein the capacitors are sized to substantially match delays from nodes within the ladder network to an output node. The Z/2Z la... | 11/07/2006 |
| 7123233 | Display device In a display device, clock supplying transistors turn on and off in response to a digital image signal retained in capacitance elements fed from drain signal lines through pixel element selection transistors. The image signal is applied to capacitance electrodes thr... | 10/17/2006 |
| 7098829 | Digital to analog conversion A unit cell for a digital to analog conversion circuit that includes a current source (CS); a first data switch (S1) coupled to the current source (CS); a second data switch (S2) coupled to the current source (CS); a first phase switch (Phi1) co... | 08/29/2006 |
| 7098825 | Fixed offset digital-to-analog conversion device and method I describe and claim an improved digital-to-analog conversion device and method. The device comprises a current supply circuit to generate a plurality of control currents responsive to a plurality of digital signals. An input voltage generating circuit is adapted to... | 08/29/2006 |
| 7095351 | Digital-to-analog converter structures A DAC architecture is described. The architecture is specifically adapted to provided an analog voltage output based on a digital input word. The architecture includes a resistor ladder configuration sub-divisible into a first component, adapted to convert a lower p... | 08/22/2006 |
| 7095347 | Digitally trimmed DAC cell A digitally trimmed current source. The novel current source includes a first circuit for generating a current in response to an applied voltage and a resistance variable in response to a control signal, and a second circuit for supplying the control signal. The fir... | 08/22/2006 |
