Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8031100 | Fine resistance adjustment for polysilicon A resistor string digital to analog converter formed of polysilicon resistor segments to each of which is applied an electric field. The approach improves the overall accuracy. ... | 10/04/2011 |
| 8013772 | Reduced area digital-to-analog converter One embodiment of the invention includes a digital-to-analog converter (DAC) system. A resistive ladder comprises a plurality of resistors having an approximately equal resistance and is arranged in a respective plurality of resistive rungs between first and second ... | 09/06/2011 |
| 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 digital data (D-DATA). For each of the plura... | 05/03/2011 |
| 7884747 | Digital to analog converters having circuit architectures to overcome switch losses A digital to analog converter (DAC) includes a pair of operational amplifiers each having a first input coupled to a respective high or low reference voltage. The DAC includes a plurality of switch-controlled cells, each of which includes a resistor and two force/se... | 02/08/2011 |
| 7868809 | Digital to analog converter having fastpaths A resistor-based digital to analog converter (DAC) having mux fastpaths, which selectively connect a subset (or an entirety) of voltage divider nodes in a DAC to either a higher level of multiplexor hierarchy, or a DAC output node, effectively bypassing one or more ... | 01/11/2011 |
| 7812754 | Digital to analog converter and method thereof A digital to analog converter (DAC) has a plurality of transistor-resistor units connected in a string. Each of the transistor-resistor units of the DAC has a pair of transistors that are turned on/off by a pair of complementary control signals. Since the two transi... | 10/12/2010 |
| 7796075 | Method and apparatus for internally calibrating mixed-signal devices A method to tune electronic devices in general using R/2R ladder networks to obtain fixed or variable accurate properties that may include, but are not limited to resistance, current, voltage, and/or timing. As a particular application, a method for internally calib... | 09/14/2010 |
| 7773019 | Digital-to-analog converter A PRA-DAC is disclosed. The PRA-DAC is operable to increase its conversion speed. ... | 08/10/2010 |
| 7724172 | Digital-to-analog converter circuit and method A digital-to-analog converter, in response to a digital signal, selectively taps a resistor string to generate an analog output and selectively shunts around resistors in the string to voltage shift the analog output. If two supply voltage sets are present, two stri... | 05/25/2010 |
| 7714759 | Low power linear interpolation digital-to-analog conversion A resistor network digital-to-analog converter (DAC) subdivides each sampling clock cycle of the DAC into a number of phases. For at least one bit input of the DAC associated with a desired input resistor weight, the input bit value is sampled at each phase. Each of... | 05/11/2010 |
| 7710302 | Design structures and systems involving digital to analog converters A digital to analog converter (DAC) system comprising, a first segment, wherein a segment comprises, a first path including an array of resistors connected in series between a first reference voltage node and a second reference voltage node, wherein the array is con... | 05/04/2010 |
| 7646322 | Folded R-2R ladder current-steering digital to analog converter A folded R-2R ladder current-steering digital-to-analog converter is disclosed. In the folded R-2R ladder current-steering digital-to-analog converter, each node in the R-2R ladder is electrically coupled with a plurality of current sources with different weights. T... | 01/12/2010 |
| 7639168 | Systems and methods for switch resistance control in digital to analog converters (DACs) A switch signal generator circuit that may form part of a digital to analog converter is provided. The switch signal generator circuit may include a first switch that controls a high reference gate voltage. The high reference gate voltage may provide the ON state vo... | 12/29/2009 |
| 7616144 | Resistor ladder interpolation for PGA and DAC A voltage interpolation circuit includes a resistive ladder connected between ground and a voltage input and having a plurality of resistors with voltage taps between the resistors. An amplifier (optionally) has first and second capacitors connected together at thei... | 11/10/2009 |
| 7605735 | Digital-to-analog converter with R-2R ladder network by polarity control A digital-to-analog converter (DAC) includes an R-2R ladder network, switches, and an operation amplifier (OP) with a feedback resistance, for providing an analog voltage in a positive polarity and a negative polarity. Each of the switches is switched between a conn... | 10/20/2009 |
| 7602327 | Digitally controllable on-chip resistors and methods A digitally controllable resistor includes a substrate and at least one digitally controllable resistance stage formed on the substrate. Each of the stage(s) can include a first resistor connected in series with a switch and a second resistor connected in parallel w... | 10/13/2009 |
| 7554475 | Low-power inverted ladder digital-to-analog converter An inverted ladder circuit for a Digital to Analog Converter (DAC) having an input binary word representing an input value and an output current corresponding to a converted analog value. The inverted ladder circuit includes at least two fine resistor ladders, inclu... | 06/30/2009 |
| 7532142 | Structures for systems and methods of generating an analog signal A digital to analog converter (DAC) system includes a resistor network providing enhanced response time and steady state characteristics. ... | 05/12/2009 |
| 7522083 | Semiconductor device having D/A conversion portion A DAC having a memory mat including a plurality of first memory cells, and a plurality of output lines connected to the plurality of first memory cells. Each of the plurality of memory cells has a first memory portion including bipolar transistors and storing inform... | 04/21/2009 |
| 7504980 | Semiconductor device A semiconductor device includes a semiconductor substrate and a ladder resistor formed on the semiconductor substrate. The ladder resistor includes a plurality of elongated resistor portions arranged in parallel with each other, a plurality of connection portions th... | 03/17/2009 |
| 7504979 | System and method for providing an ultra low power scalable digital-to-analog converter (DAC) architecture A system and method are disclosed for providing an ultra low power scalable digital-to-analog converter architecture. Refresh buffer circuits are provided to buffer a voltage reference resistor string. The refresh buffer circuits may be coupled to the resistor strin... | 03/17/2009 |
| 7482963 | D/A conversion circuit, display panel drive circuit, and display A drive circuit for a display panel has a D/A conversion circuit which has a unit region serving as a circuit element that is formed in an IC. Contact pads are provided at both ends in a rectangular guard ring region and at the center thereof. Further, a plurality o... | 01/27/2009 |
| 7463177 | Digital-to-analog converter with secondary resistor string A digital-to-analog converter generates a monotonic sequence of reference voltages and selects an arbitrary pair of reference voltages, adjacent in the monotonic sequence. One of the selected reference voltages is supplied through a resistor and a switching device, ... | 12/09/2008 |
| 7446689 | Compensation of resistance drift A system, apparatus and method for providing a digital variable resistor with high resolution and efficient use of substrate area is described. In one embodiment of the invention, a digital variable resistor string comprises a serial array of resistors that is conne... | 11/04/2008 |
| 7420499 | Analog-to-digital converter and threshold-value correcting method An analog-to-digital converter includes a track-and-hold circuit, a constant-voltage source, a threshold voltage selection circuit, a first comparator to a seventh comparator, an encoder, and a reference voltage output circuit. In a correction mode where the offsets... | 09/02/2008 |
| 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 |
| 7414561 | Gradient insensitive split-core digital to analog converter Digital to analog converter circuits and methods are provided for producing an analog output voltage indicative of a digital input signal with at least partial insensitivity to error gradients. Described are split-core resistive elements, which include a plurality o... | 08/19/2008 |
| 7403145 | Data driver and driving method of organic light emitting display device using the same A data driver capable of generating data signals with desired voltage values. The data driver includes a first digital-analog converter including a plurality of first switches, the first digital-analog converter selecting two reference voltages from among a pluralit... | 07/22/2008 |
| 7403149 | Folding and interpolating analog-to-digital converter and method of converting analog signal to digital signal A folding and interpolating analog,-to-digital converter (ADC) includes a preamp unit, a first folding stage, a second folding stage, a comparison unit and an encoder. The preamp unit receives an analog input signal and reference voltages to generate reference signa... | 07/22/2008 |
| 7400312 | Common voltage adjustment circuit and liquid crystal display panel utilizing the same A common voltage adjustment circuit. The common voltage adjustment circuit is applied in a liquid crystal display panel having a plurality of display units, coupled to a common electrode. The common voltage adjustment circuit has a first register, a second register,... | 07/15/2008 |
| 7397407 | D/A conversion circuit and A/D conversion circuit A D/A conversion circuit for performing D/A conversion at high speeds. The D/A conversion circuit includes a resistor string including a plurality of resistor elements connected between a low-potential power supply and a high-potential power supply. A plurality of f... | 07/08/2008 |
| 7394421 | Fast analogue-to-digital converter The invention relates to fast analogue-to-digital converters having differential inputs and a parallel structure, comprising at least one network of N series resistors with value r and one network of N comparators. The series resistor network receives a reference vo... | 07/01/2008 |
| 7388532 | Overdrive digital-to-analog converter, source driver and method thereof An overdrive digital-to-analog converter (DAC), a source driver, and a method thereof are provided. The DAC comprises a voltage divider unit, a selection unit, a buffer unit, and a detection unit. The voltage divider unit provides a plurality of reference voltages. ... | 06/17/2008 |
| 7385545 | Reduced component digital to analog decoder and method An n bit D/A decoder is formed using P-type and N-type transistor switches, instead of convention CMOS switches. Each P-type and N-type switch may be formed of fewer transistors than those used to form a CMOS switch, thereby reducing the overall transistor count. Th... | 06/10/2008 |
| 7379004 | Driving circuit and method for increasing effective bits of source drivers An LCD driving circuit and method for increasing effective bit(s) of the source driver is disclosed. A reference voltage generator generates a group of compensated reference voltage levels that are interlaced with original reference voltage level of original referen... | 05/27/2008 |
| 7375669 | Digital/analog converter A digital/analog converter includes a first divided-voltage generating section which divides a reference supply voltage through the voltage distribution, a decoder section which receives a digital signal so as to output a decoded selection signal, a first divided-vo... | 05/20/2008 |
| 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 |
| 7369074 | D/A converter for a digital signal after non-linear A/D conversion, audio signal processing circuit and liquid crystal display device including the same A D/A converter inputted with non-linear conversion digital data such as a digital signal encoded according to a μ-Law system or the like as it is to convert into an analog signal. A D/A converter is of resistor string type, in which a resistance value of each of r... | 05/06/2008 |
| 7362253 | Introduction to R2RC D/A converter A Digital to Analog (D/A) converter has a plurality of stages. Each of the plurality of stages has a first resistive element. A second resistive element is coupled to the first resistive element and has approximately twice a resistive value of the first resistive el... | 04/22/2008 |
| 7358886 | Voltage output digital-to-analog converter circuit According to this invention, there is provided a voltage output digital-to-analog converter circuit, including other ones of the second resistive elements and third resistive elements having a desired resistance value are series-connected between the other ends of t... | 04/15/2008 |
