Class 341/146 - Serial conversion

Subclass of Class 341 - Coded data generation or conversion
Definition: Subject matter where the conversion occurs as a series of
No. of patents: 39
Last issue date: 10/04/2011

Number	Title	Issue Date
8031098	DAC circuit with pseudo-return-to-zero scheme and DAC calibration circuit and method In one embodiment, digital-to-analog converter (DAC) circuit includes dual DAC units employing pseudo-return-to-zero DAC operations to reduce inter-symbol interference. Moreover, each DAC unit is implemented using complementary MOS transistors to improve conversion ...	10/04/2011
7336794	High efficiency driver for miniature loudspeakers In a first aspect the present invention provides a compact high efficiency driver suitable for driving a loudspeaker, such as a miniature loudspeaker for mobile phones or hearing aids. The driver comprising an interface for receiving an input signal, a three-level m...	02/26/2008
7200767	Maintaining synchronization of multiple data channels with a common clock signal Maintaining synchronization when sending/receiving multiple channels of data with a corresponding common reference clock signal. Synchronization signals (e.g., pulses) are generated periodically and the timing of channels is adjusted. In an embodiment, multiple sequ...	04/03/2007
7062401	Low circuit overhead built in self test for oversampled ADC's Circuitry and a method for testing oversampled Analog to Digital converters. The voltage reference is used as the input signal, thus eliminating the need for a special signal generator. The dynamic signal is obtained by not sampling the voltage reference on every sa...	06/13/2006
7034732	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 ...	04/25/2006
6956515	Digital to analog converter augmented with direct charge transfer techniques A digital to analog converter augmented with Direct Charge Transfer (DCT) techniques. A digital to analog converter augmented with DCT and CDS techniques. A digital to analog converter augmented with Postfilter Droop Compensation. ...	10/18/2005
6917321	Method and apparatus for use in switched capacitor systems Systems and methods receive a digital signal and generate an analog signal indicative thereof. In one embodiment, a system includes a DAC that receives a multi-bit digital signal, generates at least two analog signals each indicative of the value of the multi-bit di...	07/12/2005
6867722	H-bridge common-mode noise reduction circuit A common-mode noise reduction circuit (20) adapted to receive a DIN input (−1, 0, +1), such as from a sigma-delta modulator (12), and provide alternating outputs (DoutP, DoutM) such as to reduce the common-mode noise of an H-bridge (14). A zer...	03/15/2005
6639528	Apparatus for multi-channel signal processing and communication terminal using the same A signal processing apparatus includes a first signal processor which processes a first channel of signal; and a second signal processor which processes a second channel of signal independently from the processing by the first signal processor....	10/28/2003
6636575	Cascading PLL units for achieving rapid synchronization between digital communications systems A clock synchronization system for synchronizing a first communications device and a second communications device to enable digital communication there between. A first device generates a first clock signal Fa. A second device generates a second clock sig...	10/21/2003
6621442	Analog-to-digital conversion with piece-wise non-linear reference waveforms A machine used for analog-to-digital (A/D) conversion in which an analog input is compared to a piece-wise non-linear analog reference waveform. A digital count is recorded indicative of when the difference between the two becomes zero. Alternative mappin...	09/16/2003
6501409	Switched-capacitor DAC/continuous-time reconstruction filter interface circuit A circuit includes a switched-capacitor array for converting a digital signal into a corresponding amount of electric charge, a switching circuit, and a continuous-time reconstruction filter circuit. The switched-capacitor array includes a plurality of ca...	12/31/2002
6448918	Digital/analog converter It is object to provide a digital-to-analog converter capable of generating an output waveform having less distortion without increasing the operating speed of components. A D/A converter comprises a multiplying section 1, four data holding sections 2-1 t...	09/10/2002
6407682	High speed serial-deserializer receiver A serial-deserializer converts a high speed serial data input to a lower speed parallel output. By including this circuit on a chip, connections to the chip are made more easily. A gated voltage controlled oscillator provides clock signals to sample the d...	06/18/2002
6380878	Digital-to-analog conversion circuit The present invention refers to a digital to analog conversion circuit able to transform an input digital signal having n bit in a signal having a thermometric code and to convert it in an analog output signal. In an embodiment the digital to analog conve...	04/30/2002
6078276	Digital-to-analog conversion of LSB-first type using selective inversion based on gray code bits D/A-conversion of a Gray coded digital input signal is performed according to an inventive recursive Gray code-to-analog conversion algorithm. According to the recursive algorithm, the Gray code bits of the digital input are successively applied in the re...	06/20/2000
6041080	Signal processing system and method for digitally mixing a plurality of analog input signals A signal processing system receives and mixes a plurality of analog input signals having a maximum frequency. Each analog input signal is connected to an input of a modulator producing a high frequency oversampled digital signal. Each high frequency overs...	03/21/2000
5896100	Method and apparatus for analog-to-digital or digital-to-analog conversion An analog-to-digital converter circuit is disclosed that is capable of converting both positive and negative analog input signals, and that is capable of operating as either an analog-to-digital converter or a digital-to-analog converter. The converter in...	04/20/1999
5798724	Interpolating digital to analog converter architecture for improved spurious signal suppression A digital-to-analog conversion method and interpolating digital-to-analog converter for a data modulation system which reduces the spurious energy content of the output signal by an order of magnitude to thereby permit use of a less complex reconstruction...	08/25/1998
5781139	Switched capacitor digital-to analog converter In a switched capacitor type digital-to-analog (D/A) converter, a group of n bits of the binary word are applied to n parallel branches of the D/A converter, respectively. In a given branch, the corresponding bit is applied to a control terminal of a corr...	07/14/1998
5748128	Reduced current quadratic digital/analog converter with improved settling-time A digital/analog quadratic converter (DACQ) composed by a pair of linear converters connected in cascade has a direct coupling of the output node of the first converter (DAC1) with a node of a R-2R type resistive network of the second converter (DAC2) cor...	05/05/1998
5727024	Circuit configuration for conversion of a one-bit digital signal into an analog signal A circuit configuration for converting a one-bit digital signal at a given sampling frequency into an analog signal, includes a multiplication device having one input receiving the digital signal, another input receiving a reference signal and an output. ...	03/10/1998
5691721	Digital/analog converter having separately formed voltage dividing resistance regions An N bit (where N is an integer) converter having separately formed voltage dividing resistance regions includes a semiconductor substrate of a first conductivity type. (N+1) well regions of a second conductivity type are each formed separately on the sem...	11/25/1997
5673045	Digital-to-analog conversion circuit and analog-to-digital conversion device using the circuit A digital-to-analog conversion circuit includes a first reference voltage generation circuit for generating a plurality of first reference voltages, a plurality of second reference voltage generation circuits for generating a plurality of second reference...	09/30/1997
5614905	High speed serial digital data to analog signal converter An Ethernet-type local area network having multiport repeaters and nodes within a specified distance of the hub is able to communicate high speed digital data over multiple pairs of twisted-pair wires using long symbol group-type ternary coding. Bundle mo...	03/25/1997
5519396	Network swappers and circuits constructed from same An n-bit analog processing circuit constructed with network swappers has n stages and an input port for inputting an analog signal to be processed. Each of the n stages includes first and second reference input ports, at least one swappable network having...	05/21/1996
5307064	Digital-to-analog converter capable of reducing load of low-pass filter A digital-to-analog (D/A) converter used for a digital audio equipment, comprises a binary D/A converting circuit and a calculation processing circuit for receiving an analog signal derived from the binary D/A converting circuit. This D/A converter is cap...	04/26/1994
5274373	Digital analog converter A digital/analog converter including four D/A conversion. The D/A convertor comprises four D/A conversion parts (DA1) to (DA4). On a single semiconductor chip the D/A convertion parts (DA1) to (DA4) are arranged so that the D/A conversion parts (DA1) and (DA3)...	12/28/1993
5107265	Analog to digital converter A continuous ADC for generating a digital representation, corresponding to a given quantized voltage level, of an analog input signal and for updating the digital representation at times when the approximate amplitude of the analog signal changes from one...	04/21/1992
4992724	Bridge balancing circuit A bridge balancing circuit includes a bridge having a resistance change type sensor, a differential amplifier for extracting a voltage difference across two central nodes of the bridge, a comparator connected to the output terminal of the differential amp...	02/12/1991
4990912	Digital peak/valley detector A peak-valley detector of an analog signal which provides a digital output of the analog signal. A digital counter is used having an output coupled to a digital-to-analog convertor. The output of the digital-to-analog convertor is compared to an input ana...	02/05/1991
4978959	Analog to digital converter, a digital to analog converter and an operational amplifier therefor An operational amplifier is provided and includes at least two input terminals of one polarity and another input terminal of the opposite polarity. The amplifier includes an amplifying portion which comprises a differential section for receiving input sig...	12/18/1990
4929947	Constant width pulse distribution in a digital to analog converter for serial digital data A digital-to-analog converter comprising: a distributing circuit (2, 3, 4, 5; 2, 13, 14-26) for distributing data pulses, which are bit-serially supplied at constant time intervals, into a plurality of routes and for providing them as pulses having a constant ...	05/29/1990
4905006	Digital-to-analog converter A digital-to-analog converter for converting a digital signal having a word length n into an analog signal comprises a series arrangement of at least two integrating circuits (1,2) and a control unit (18) for supplying a first and a second control signal ...	02/27/1990
4901077	Sigma-delta modulator for D-to-A converter A digital-to-analog converter includes a sampled data sigma-delta modulator to resample and coarsely quantize the digital samples to be converted. The coarsely quantized samples are converted to sequences of pulses which are applied to a pulse sensitive a...	02/13/1990
4868572	Circuit arrangement for converting digital sound-signal values into an analog sound signal This circuit arrangement includes an interpolation filter (3) which converts the incoming signal values (A) into interpolated signal values (B) of increased repetition frequency. The interpolated signal values (B) are reduced in word length by means of a ...	09/19/1989
4843393	D/A converter A D/A converter includes a first stage capacitor ladder, a second stage capacitor ladder, a coupling capacitor, (l+m) switches, and a short-circuiting switch. The first stage capacitor ladder includes l capacitors having one side electrodes commonly conne...	06/27/1989
4829299	Adaptive-filter single-bit digital encoder and decoder and adaptation control circuit responsive to bit-stream loading An adaptive single-bit encoder and decoder has its adaptive function determined by dynamically dividing the message frequency band into delta-sigma and delta modulation regimes of operation. IN a practical embodiment this is accomplished by varying the co...	05/09/1989
4427971	Method and apparatus for the conversion of digital words to analog signals Signal information is converted between analog and digital form in a two-step process employing conversion apparatus having stable, but not necessarily highly accurate components. The component tolerances on such conversion apparatus are much greater than...	01/24/1984

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Class 341/146 - Serial conversion