Match Document Document Title
7961125 Method and apparatus for dithering in multi-bit sigma-delta digital-to-analog converters  
A multi-bit (M-bit, M>1) Sigma-Delta digital-to-analog converter (DAC) with a variable resolution multi-bit quantizer that has its digital value inputs that are truncated or rounded to a...
7961130 Data look ahead to reduce power consumption  
Portions of a digital signal are buffered prior to being provided to a sub-system (e.g., a segmented DAC of a LDD) that is responsive to the digital signal. While being buffered, there is a...
7956785 Return to zero digital to analog converter and converting method thereof  
The present invention relates to a digital to analog converter, to a return-to-zero digital to analog converter with improved wideband characteristics by enabling a return-to-zero output without...
7956786 Digital-to-analogue converter  
An N-bit DAC comprises a main DAC circuit having main nodes on which analogue voltages are produced of progressively increasing values in steps of the value of one MSB value, and a sub-DAC circuit...
7956784 DA converter including conversion amplifier having output voltage with improved linearity  
A DA converter includes an IV conversion amplifier with output voltage having good linearity, to thus improve total harmonic distortion (THD) characteristics. In the DA converter, a first current...
7956782 Current-mode sigma-delta digital-to-analog converter  
In general, this disclosure is directed to a differential current-mode sigma-delta digital-to-analog converter (SD DAC) with improved accuracy and reduced offset and gain errors. In one example,...
7952507 Programmable segmented digital-to-analog converter (DAC)  
Provided herein are segmented digital to analog converters (DACs), methods for use therewith, and systems that include one or more such DACs. According to an embodiment, a DAC includes a plurality...
7948417 Digital harness with analog inputs  
A digital data harness, uses a signal specific conditioning circuit to interface with analog sensors. The signal specific conditioning circuits convert data signals from analog to digital and...
7948416 Digital to analog converter spur cancellation  
A device includes an upsampling digital-analog converter (DAC) and logic to add a DC offset to a signal input to the DAC, the logic adapted to set the DC signal to cancel a DAC output spur.
7948414 Delta-sigma analog-to-digital conversion apparatus and method thereof  
A delta-sigma analog-to-digital conversion apparatus for receiving an analog input signal to generate a digital output signal includes a subtracting unit, a quantizer, and a feedback unit. The...
7948415 DA converter, AD converter, and semiconductor device  
A DA converter includes a first DA conversion section for obtaining an analog output signal in accordance with a digital input signal value, and a second DA conversion section for obtaining an...
7944381 Compensation of nonlinearity of single ended digital to analog converters  
This disclosure relates to a compensating for nonlinearity resulting from a capacitance feedback in current cells of a single ended digital to analog circuit.
7944378 Circuits and methods for calibrating analog and digital circuits  
In one embodiment the present invention includes a circuit for calibrating analog and digital circuits. The circuit includes an analog input stage, a discrete time processing stage, a DAC, and a...
7944382 Exponential digital to analog converter  
A system for generating a programmable exponential analog output signal, comprising a digital to analog conversion circuit for converting said digital signal into an analog output signal, the...
7936294 Digital-to-analog converter, analog-to-digital converter, and semiconductor device  
A DA conversion device includes the following elements. A higher-bit current source cell portion includes uniformly weighted higher-bit current source cells to generate an identical constant...
7936295 Digital/analog converter circuit  
A selection section (105) selects a step voltage, among a plurality of step voltages (SV1, SV2, SV3, . . . ) each having a voltage value changing stepwise, corresponding to the digital value of...
7928881 Direct digital frequency synthesizer using variable sine wave-weighted digital to analog converter and synthesizing method thereof  
The present invention relates to a direct digital frequency synthesizer using a variable sine wave-weighted digital to analog converter with improved size and efficiency and a synthesizing method...
7928880 Digital analog converter  
A digital analog converter has an input terminal receiving a digital input signal, a lower-side capacitor group coupled to a lower-side common terminal in parallel, an upper-side capacitor group...
7928877 Continuous-time delta-sigma modulator with small distributed resonators  
A continuous time delta-sigma modulator having a sampling frequency includes a distributed resonator having a length about equal to a reciprocal of an integer times a velocity of a signal in the...
7928879 Audio processor  
An audio processor is provided which includes a digital signal processor for processing a digital audio data in an inputted digital audio file and a digital analog converter for converting the...
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...
7924198 Digital-to-analog converter  
A digital-to-analog converter is disclosed. The digital-to-analog converter includes a decoder that receives a plurality of digital input signals to output a plurality of thermometer decode...
7924197 Method for reducing current consumption of digital-to-analog conversion, and associated tri-state current digital-to-analog converter  
A method for reducing current consumption of digital-to-analog conversion includes: monitoring logical states of a set of differential digital inputs, wherein the set of differential digital...
7924194 Use of three phase clock in sigma delta modulator to mitigate the quantization noise folding  
A differential sigma delta modulator operates by modulating an input signal by intermittently coupling a reference signal to the input signal using one or more switches controlled by one or more...
7924196 Digital-analog converter  
A parallel digital-analog converter for the conversion of a plurality of differential digital input signals into a differential analog output signal, including a group of 1-bit digital-analog...
7924195 Hardware-efficient reconstruction for periodic non-uniformly sampled signals  
Method and apparatus for signal reconstruction enabling the sharing of analog-to-digital converter resources among signals. Embodiments include a signal reconstruction method that allows...
7924199 Current steering DAC  
In a multi-channel current steering DA converter, e.g., a two-channel current steering DA converter, reference current sources Irefa and Irefb that can serve as current mirror sources for current...
7920082 D/A converter circuit and digital input class-D amplifier  
The present invention provides a D/A converter circuit which enables D/A conversion with a high precision and can prevent occurrence of a limit cycle component in the case where an input signal is...
7919932 Apparatus and method for controlling lighting brightness through digital conversion  
Provided is an apparatus for controlling lighting brightness including a light control unit that generates a control signal for controlling the brightness of a plurality of lightings; a digital...
7916057 Complex-admittance digital-to-analog converter  
A circuit includes a digital-to-analog converter configured to produce an analog output signal (1) proportional to a reference signal and (2) as a function of a digital input signal. The converter...
7916055 Sigma-delta modulator and method thereof  
A sigma-delta modulator includes an adder, a filter, a quantizer, and a clock rate controller. The adder receives an input signal and an output signal to generate a summation signal. The filter is...
7916059 Digital-analog conversion device and method for the digital-analog conversion  
A digital-analog conversion circuit, a method for the digital-analog conversion and a source driver are disclosed. A digital-analog conversion circuit may include a latch for storing N bit digital...
7917798 Superconducting digital phase rotator  
An important component in digital circuits is a phase rotator, which permits precise time-shifting (or equivalently, phase rotation) of a clock signal within a clock period. A digital phase...
7916058 Digital-to-analog converter (DAC) with reference-rotated DAC elements  
In accordance with at least some embodiments, an electronic device comprises a digital-to-analog converter (DAC) having a DAC element array. Reference-rotated data weighted averaging (RRDWA) is...
7911367 Method and circuit for converting an N-bit digital value into an analog value  
A method for converting an N-bit digital value into an analog value is provided. N-M most significant bits of the digital value are converted into a first PWM signal whose period is a multiple of...
7907073 Variable passive components with high resolution value selection and control  
The present system provides a method for varying the value of passive components in electronic circuits. Passive components can range from basic resistors, capacitors, and inductors to complex,...
7907074 Circuits and methods to reduce or eliminate signal-dependent modulation of a reference bias  
Circuits and methods that improve the performance of voltage reference driver circuits and associated analog to digital converters are provided. A voltage reference driver circuit that maintains a...
7907072 Digital-to-analog converter  
A DAC unit, connected to a current supply transistor, includes first control transistors connected in parallel to each other, with each being connected in series to the current supply transistor....
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...
7903013 Semiconductor device  
Operating speed as well as output accuracy of a D-A converter is enhanced. With a semiconductor device including unit current sources, and unit current source switches, plural current source...
7903006 Automatic power control system for optical disc drive and method thereof  
An automatic power control system, a down sampling circuit and a down sampling method. The automatic power control system is incorporated in an optical disc drive comprising a laser diode for...
7903012 D/A converter and reference voltage circuit including same  
A variable resistor is connected to each terminal of (2^n)−1 resistors R connected in series. The variable resistors have resistances RH and RL determined according to a digital signal containing...
7903011 Differential current-mode translator in a sigma-delta digital-to-analog converter  
A differential current-mode sigma-delta digital-to-analog converter (SD DAC) and a method for generating positive and negative reference voltages in a sigma-delta digital analog converter are...
7903014 Techniques to improve differential non-linearity in R-2R circuits  
A circuit and corresponding method are presented for generating an analog voltage from a digital input value is presented. An digital to analog conversion circuit, which is connected between a...
7903015 Cascaded DAC architecture with pulse width modulation  
An embodiment of the invention provides one or more cascade circuits that are cascaded together to form a cascaded circuit. The cascaded circuit reduces noise at an analog output of the cascaded...
7903007 Method and apparatus for converting signals  
A method of converting a plurality of input signals on first and second converters, such that the first and second converters are both used when the plurality of signals comprises two signals,...
7898447 Methods and systems for testing digital-to-analog converter/amplifier circuits  
A digital-to-analog converter (DAC)/amplifier testing system for use in an electron-beam (e-beam) mask writer, the e-beam mask writer including a plurality of DAC/amplifier circuits to output...
7893853 DAC variation-tracking calibration  
A method of calibrating a digital-to-analog converter (DAC) is provided. The DAC includes a least-significant bit (LSB) block, and dummy LSB block adjacent to the LSB block. The DAC has a...
7893856 Digital-to-analog conversion circuit  
A digital-to-analog conversion circuit includes a first digital-to-analog converter (DAC), a second DAC, and a control circuit to select which DAC to use for digital-to-analog conversion of a...
7893854 Optical digital to analog converter  
According to one embodiment of the invention, a digital to analog converter for converting a digital signal to an analog optical signal includes a light source and a plurality optical switches....