Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 5539404 | Digital to analog converter using recursive signal dividing charge coupled devices Analog memories such as CCD, which are advantageous in less power consumption and higher integration density, are used to configure a system for highly accurately executing digital/analog processing. A digital to analog converter according to the inventio... | 07/23/1996 |
| 5534863 | Low resolution, high linearity digital-to-analog converter without trim A digital-to-analog (D/A) converter eliminates matching requirements and does not generate harmonics or noise. The D/A converter has an array of injectors for converting an input word to an analog voltage. A plurality of clocked switches discharge the inj... | 07/09/1996 |
| 5467089 | Capacitor array digital/analog converter with compensation array for stray capacitance A digital/analog converter with a weighted capacitive converter network is provided with weighted stray capacitors for reducing non-linearities in switching. Additional stray capacitors are connected in parallel to the otherwise present stray capacitors f... | 11/14/1995 |
| 5455581 | Digital-to-analog converter employing a common trigger and reference signal The D/A converter comprises: a digital counter receiving a reference clock pluses and a reference voltage as a start signal so as to output a stop signal when the digital counter counts the reference clock pulses until a predetermined number; and a number... | 10/03/1995 |
| 5453757 | Liquid crystal display control system including storage means and D/A converters A liquid crystal display control system comprises a liquid crystal panel, a plurality of data latches for storing digital gray scale data, and a plurality of D/A converters for converting the outputs of the data latches into analog signals to be applied t... | 09/26/1995 |
| 5451950 | Method for reducing errors in switched-capacitor digital-to-analog converter systems and apparatus therefor A switched-capacitor DAC system includes two switched-capacitor DACs and a load circuit. The switched-capacitor filter of the first DAC samples a reference voltage source, which produces a reference voltage, at a first rate and the switched-capacitor filt... | 09/19/1995 |
| 5440306 | Switched capacitor circuit having reduced capacitance units A switched capacitor circuit includes a first capacitor (102) connected between first and second nodes (101, 103), a second capacitor (C1) connected between the first node and an intermediate node (M), and a third capacitor (C2) conn... | 08/08/1995 |
| 5426413 | High speed integrating digital-to-analog converter A digital-to-analog converter, particularly for digital systems requiring a fast and accurate high resolution conversion of a digital input code into a corresponding analog output voltage. The converter comprises essentially an integrator and at least two... | 06/20/1995 |
| 5412387 | Error reduction in switched capacitor digital-to-analog converter systems by balanced sampling A switched-capacitor DAC system includes two switched-capacitor DACs and a load circuit. The switched-capacitor filter of the first DAC samples a reference voltage source, which produces a reference voltage, at a first rate and the switched-capacitor filt... | 05/02/1995 |
| 5406283 | Multi-bit oversampled DAC with dynamic element matching A Sigma-Delta converter, has a receiver for receiving an input digital signal; a digital loop filter and quantizer having an input and an output; a summer having a first input connected to the receiver, a second input connected to the output of the digita... | 04/11/1995 |
| 5400028 | Charge summing digital to analog converter A D/A converter which develops the analog output by summing binary-weighted packets of electrical charge. Charge metering techniques are used to generate and sum the charge packets. It is particularly suited to application in the data line driver circuits... | 03/21/1995 |
| 5389928 | Process for the D/A conversion of signed binary codes of a Bi-polar, time-varying signal and a digital-to-analog converter employing this process The process for the conversion of a digital code involves the construction of two positive unipolar voltages (Vo+, Vo-) ranging between the analog ground level (Vgnd) and an upper full scale level (Vref), and the shifting downward of the second one (Vo-) ... | 02/14/1995 |
| 5376936 | One-bit switched-capacitor D/A circuit with continuous time linearity A modified lossy integrator digital-to-analog converter includes an amplifier (46) that receives an input on a summing node (48) and provides an output on a node (52). A feedback capacitor (50) is disposed across the input and output and has an output swi... | 12/27/1994 |
| 5374929 | DA converter which combines output of a plurality of low pass filters selectively enabled and disabled by respective electronic switches In a DA converting circuit using a PAM circuit and low pass filters, an analogue signal of high quality can be obtained by removing ringing due to the cut-off frequency of the filters. A PAM signal outputted by the PAM circuit is switched on and off by a ... | 12/20/1994 |
| 5332997 | Switched capacitor D/A converter A set of N digital data bits serially supplied to an input node are converted to an analog voltage by means of N binary weighted capacitors and N switching transistors, one capacitor being associated with one switching transistor for each one of the N dig... | 07/26/1994 |
| 5323158 | Switched capacitor one-bit digital-to-analog converter A switched capacitor one-bit digital-to-analog converter is preferably utilized in the feedback path of a sigma delta modulator. The one-bit digital-to-analog converter includes first and second capacitors, a first switching circuit for coupling charge fr... | 06/21/1994 |
| 5278478 | Programmable PD servo-compensator A programmable PD servo compensator has the transfer function of the combination of a standard PD compensator in tandem with a second order low pass filter. The programmable PD servo compensator consists simply of a biquad filter having a single complex z... | 01/11/1994 |
| 5274376 | Multi-mode digital to analog converter and method A multi-mode digital to analog converter for converting a digital input into an analog voltage according to a linear or a companding transfer function. The converter comprises a charge redistribution device for creating an analog voltage at a node and swi... | 12/28/1993 |
| 5258759 | Method and apparatus for monotonic algorithmic digital-to-analog and analog-to-digital conversion The present invention provides a compact and robust architecture and a corresponding method to implement a monotonic algorithmic D/A converter that processes the bits of the digital input in the order from MSB to LSB, and a successive approximation A/D co... | 11/02/1993 |
| 5245344 | High order switched-capacitor filter with DAC input A digital-to-analog converter includes a delta-sigma modulator (10) that receives a digital input and converts it to a one-bit digital output stream. A fourth order switched-capacitor filter (12) is operable to receive the one-bit digital stream and conve... | 09/14/1993 |
| 5235335 | Circuit and method for tuning capacitor arrays A capacitor array circuit is disclosed herein. A main capacitor array includes at least a most significant array portion 12 and a least significant array portion 14. A coupling capacitor CC is formed between the two portions of the array. Typic... | 08/10/1993 |
| 5225836 | Electronic filters, repeated signal charge conversion apparatus, hearing aids and methods An electronic filter for filtering an electrical signal. Signal processing circuitry therein includes a logarithmic filter having a series of filter stages with inputs and outputs in cascade and respective circuits associated with the filter stages for st... | 07/06/1993 |
| 5206648 | Oversampling DA converter with operational amplifier driven by a single reference voltage In an oversampling digital-to-analog converter, an input 16-bit word digital signal is oversampled and quantized by a delta-sigma modulator into one of discrete values of +1, 0 and -1. A leaky integrator is coupled between the input and output terminals o... | 04/27/1993 |
| 5162801 | Low noise switched capacitor digital-to-analog converter A low-noise switched-capacitor DAC converts an integer number from an N-bit digital format into an analog voltage level by transferring charge between two appropriately ratioed capacitors using a plurality of switches. The switches select only an appropri... | 11/10/1992 |
| 5136251 | Capacitance measurement The capacitance of an unknown capacitor is measured with multimeter instrumentation employing a dual slope analog-to-digital converter. The initial voltage across the capacitor is measured and the capacitor is cyclically charged until the capacitor reache... | 08/04/1992 |
| 5111204 | Apparatus for converting data between digital and analog values Apparatus converts into an analog value signals representing digital values. Sub-sets of switches are provided, the number of switches in each sub-set being directly related to the digital significance of the switches in such sub-set. The switches in each... | 05/05/1992 |
| 5072219 | Digital-analog conversion system including a digital modulator having several quantification levels, associated with a digital-analog converter This digital-analog conversion system comprises a digital modulator (1) having several quantification levels formed by a second order Delta-Sigma modulator and a digital-analog converter and switched capacitors filter set (3) whose law of progression betw... | 12/10/1991 |
| 5057838 | D/A converter having centered switching sequence and centered arrangement of converter segment groups A plurality of segment groups constituting a D/A converter, and decoders for decoding digital signals and selecting segments constituting the segment groups are arranged on a semiconductor chip. The segments constituting the plurality of segment groups ar... | 10/15/1991 |
| 5021787 | Digital-analog converter for conversion of law A- encoded digital signals into analog signals Digital-analog converter intended to convert into analog signals digital signals formed of sign bits, of step bits and of segment bits, particularly signals coded by data compression according to law A, the said converter comprising a sign generator (4), ... | 06/04/1991 |
| 5021681 | Jiter-invariant switched capacitor pulse shaper An output pulse signal can be fabricated in an integrated circuit from an input signal. The output signal retains the desired pulse shape unaffected by jitter. A switched capacitor FIR filter is used to form the pulse shape, and then the clocking of the d... | 06/04/1991 |
| 5016012 | Technique for compensating switched capacitor circuits having gain-setting resistors A technique for compensating for variations in a resistor set overall gain switched-capacitor circuits, such as high accuracy digital-to-analog converters. The variation in overall gain from the desired gain is due to the variation in the total capacitanc... | 05/14/1991 |
| 5016014 | High accuracy analog-to-digital converter with rail-to-rail reference and input voltage ranges An analog-to-digital inverter includes successive approximation control logic for generating ten-bit binary numbers, a digital-to-analog converter (DAC) having a resistor string and a weighted-capacitor array for converting the ten-bit binary output of th... | 05/14/1991 |
| 5014059 | Analog-to-digital converter system A serial-to-parallel analog CCD GaAs device provides high speed A/D or D/A conversion. A high speed analog signal is sampled by shifting the analog data serially into "n" CCD elements. Then a parallel load pulse transfers the analog data into multiple CCD... | 05/07/1991 |
| 5012245 | Integral switched capacitor FIR filter/digital-to-analog converter for sigma-delta encoded digital audio A combined finite impulse response filter and digital-to-analog converter for converting sigma-delta over-sampled data into analog form. The filter removes out-of-band noise energy from the reconstructed analog signal resulting from the sigma-delta encodi... | 04/30/1991 |
| 5012238 | Absolute encoder An absolute encoder for detecting the absolute (as opposed to the relative) rotational displacement of an encoder shaft includes a pair of pitch signals recorded on tracks and an associated signal processing circuit. The pair of pitch signals have differe... | 04/30/1991 |
| 5008674 | Digital-to-analog converter using switched capacitor and transverse filter The converter incorporates a transversal filter. The filter delays are implemented in digital form prior to conversion into analog signals (preferably using switched capacitor techniques). One form of switched capacitor converter (with or without filterin... | 04/16/1991 |
| 4999633 | Self-calibrating A/D and D/A converter A self-calibrating A/D and D/A converter operating according to the principle of charge redistribution includes a weighted capacitive primary converter network for most significant bits, a subsidiary converter network for bits of lesser significance, and ... | 03/12/1991 |
| 4988900 | Analog signal waveform generator A generator capable of forming an analog signal having a waveform determined from a sequence of digital control words applied at a high frequency, each word representing an increment of the analog signal to be produced at the output. For this type of gene... | 01/29/1991 |
| 4968989 | Switched capacitor filter for use with a digital-to-analog (D/A) converter The output of a digital-to-analog (D/A) converter is coupled to the input of a filter. The D/A converter is initialized each time a new digital word is applied to the D/A converter for conversion, whereby each data conversion cycle (TD) include... | 11/06/1990 |
| 4967198 | Serial-to-parallel analog CCD GaAs device A serial-to-parallel analog CCD GaAs device provides high speed A/D or D/A conversion. A high speed analog signal is sampled by shifting the analog data serially into "n" CCD elements. Then a parallel load pulse transfers the analog data into multiple CCD... | 10/30/1990 |
