Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7379000 | Floating gate digital-to-analog converter The present invention provides a DAC constructed from a series of floating gate devices which are programmable to a series of predetermined values. Addressing one or more of the programmed floating gate devices will select from a wide variety of analog outputs. Repr... | 05/27/2008 |
| 7230989 | System and method for processing digital visual interface communication data signals and display data channel communication signals over a transmission line A digital communication system for transmitting and receiving Digital Visual Interface (DVI) communication data signals and Display Data Channel (DDC) communication signals over a transmission line comprises an open-loop equalizer circuit and a DDC extension circuit... | 06/12/2007 |
| 7224300 | Floating gate digital-to-analog converter The present invention provides a DAC constructed from a series of floating gate devices which are programmable to a series of predetermined values. Addressing one or more of the programmed floating gate devices, will select from a wide variety of analog outputs. Rep... | 05/29/2007 |
| 7215268 | Signal converters with multiple gate devices An analog to digital converter including a plurality of multiple independent gate field effect transistors (MIGFET) that provide a plurality of digital output signals, is provided. Each MIGFET of the plurality of MIGFETs may have first gate for receiving an analog s... | 05/08/2007 |
| 7116253 | Radio frequency digital-to-analog converter A radio frequency digital-to-analog converter with a programmable current output. In exemplary aspects of the invention, improved apparatus and methods for providing (i) current mirror matching, (ii) enhanced current pulse rising edge performance, (ii) reduced base ... | 10/03/2006 |
| 7031395 | Apparatus and methods for digital-to-analog conversion An apparatus for converting a digital input signal to an analog signal for transmission. The input signal can include more than one carrier signal. A plurality of delta-sigma modulation loop circuits are connected in an increasing order of operating frequency so as ... | 04/18/2006 |
| 6972702 | 1-Of-N A/D converter A flash analog-to-digital converter (ADC). Each comparator of the flash ADC has an OFF-ON-OFF transfer function. For each analog value to be converted, only one comparator is in the ON condition, and the other comparators are in the OFF condition. In this way, the a... | 12/06/2005 |
| 6924533 | Semiconductor integrated circuit device incorporating overvoltage protection circuit To a plurality of terminals are connected, one to one, a plurality of current mirror circuits each having a first load portion through which a first current flows when an overvoltage is applied and a second load portion through which a second current proportional to... | 08/02/2005 |
| 6909389 | Method and apparatus for calibration of an array of scaled electronic circuit elements A method and apparatus for calibrating an electronic circuit which required scaled matching of some or all of its electronic components with nonvolatile programmably trimmable parameter sources (current, voltage, resistance, capacitance) is carried out in a top-down... | 06/21/2005 |
| 6903617 | Method and apparatus for synthesizing high-frequency signals for wireless communications A semiconductor package includes a package substrate and an integrated circuit. The package substrate has a first surface. The integrated circuit couples electrically to the first surface of the package substrate. The integrated circuit and the package substrate tog... | 06/07/2005 |
| 6833800 | Differential comparator systems with enhanced dynamic range Comparator systems are provided that substantially enhance comparator dynamic range. The enhancement is primarily realized by arranging the systems to apply comparator input signals at feedback taps positioned between the upper and lower ends of comparator strings o... | 12/21/2004 |
| 6778111 | Multi-dimensional deglitch filter for high speed digital signals A system and method provide deglitch filtering. The system has a voltage-based deglitching filter and timing-based deglitching filter. The voltage-based deglitching filter connects with the timing-based deglitch filter, such that the output of the voltage-based degl... | 08/17/2004 |
| 6542098 | Low-output capacitance, current mode digital-to-analog converter A low output capacitance, current mode digital-to-analog converter. A low output capacitance is achieved by the use of a current mirror coupled to a plurality of digitally controlled current sources.... | 04/01/2003 |
| 6480137 | Method of generating matched capacitor arrays An algorithmic procedure automatically generates layout of matched capacitor arrays used in A/D converters, D/A converters and programmable gain amplifiers, among other types of devices, using templates to define the style of the layout. Since each array ... | 11/12/2002 |
| 6459396 | Electric current switch circuit and D/A converter using same An electric current switch circuit in accordance with the present invention is arranged so that an output of an IIL logic circuit is connected with the base of the first transistor of NPN type that switches ON or OFF the electric current. The first consta... | 10/01/2002 |
| 5793231 | Current memory cell having bipolar transistor configured as a current source and using field effect transistor (FET) for current trimming A current memory cell comprises a first bipolar transistor providing a current source and coupled to the emitters of a second and a third bipolar transistor, the latter forming the storage elements of the memory cell. The memory cell is calibrated, to avo... | 08/11/1998 |
| 5448238 | Method and apparatus for digital to analog conversion using GaAs HI2 L A digital to analog converter and method for conversion is provided that includes an R-2R resistor ladder network formed with a plurality of current bit switches in a GaAs HI2 L integrated circuit. Each bit switch and R-2R node in the ladder ne... | 09/05/1995 |
| 5072220 | Analog/digital converter operating by the expanded parallel method An analog/digital converter assembly includes a first analog/digital converter having N-bit resolution, operating by the parallel method and having comparators. A sample and hold element is connected upstream of the first analog/digital converter. A secon... | 12/10/1991 |
| 4872010 | Analog-to-digital converter made with focused ion beam technology An analog-to-digital converter 10 employs a series of comparators 12, 14, 16 and 18. Each comparator includes at least one inverter consisting of a CMOS transistor pair including a P-channel transistor 22 and N-channel transistor 24. The threshold levels ... | 10/03/1989 |
| 4851838 | Single chip successive approximation analog-to-digital converter with trimmable and controllable digital-to-analog converter A single chip monolithic integrated successive approximation analog-to-digital converter includes a test mode terminal for receiving shift register test mode control signals and successive approximation mode control signals. Digital test data signals are ... | 07/25/1989 |
| 4761636 | A-to-D converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 08/02/1988 |
| 4707682 | A-to-D converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 11/17/1987 |
| 4602244 | Integrated injection logic circuit An integrated injection logic circuit having constant current source transistors and switching inverter transistors. The injector thereof is directly connected to a first reference potential point and the wall thereof is connected through a bias resistor ... | 07/22/1986 |
| 4556870 | A-To-d converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 12/03/1985 |
| 4547766 | A-To-D converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 10/15/1985 |
| 4543561 | Single-supply IC digital-to-analog converter for use with microprocessors A single-chip 8-bit DAC with bipolar current sources, an output buffer amplifier for developing an output voltage, a regulated reference for producing a calibrated output, and operated by a single-voltage supply, e.g. +5 volts. The buffer amplifier includ... | 09/24/1985 |
| 4510486 | Digital-to-analog converter A digital-to-analog converter is disclosed which has a plurality of integrated injector logic (I2 L) stages each of which receives a single bit of an input digital signal. The output or inverter transistor of each I2 L stage has a nu... | 04/09/1985 |
| 4471170 | Non-integer programmable counter An I2 L non-integer programmable counter is provided that has a high frequency precision that uses feedback to adjust count length. A first divider adapted to receive a clock signal having a first frequency and an input signal, provide a signal... | 09/11/1984 |
| 4427973 | A-To-D converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 01/24/1984 |
| 4400689 | A-to-D Converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 08/23/1983 |
| 4400690 | A-to-D Converter of the successive-approximation type An integrated-circuit analog-to-digital converter of the successive-approximation type formed on a single monolithic chip. The converter is made by a diffusion process wherein certain portions of the chip are formed with normal-mode linear transistors, an... | 08/23/1983 |
| 4323795 | Bias current network for IC digital-to-analog converters and the like A single-chip 8-bit DAC with bipolar current sources, an output buffer amplifier for developing an output voltage, a regulated reference for producing a calibrated output, and operated by a single-voltage supply, e.g. +5 volts. The buffer amplifier includ... | 04/06/1982 |
| 4309693 | Solid state digital to analog converter An integrated-circuit 12-bit digital-to-analog converter comprising binarily-scaled constant-current sources with associated switch cells employing bipolar transistors to direct the bit currents either to a summing bus or to ground. The switch cells inclu... | 01/05/1982 |
| 4305064 | High density analog-to-digital converter Combining integrated injection logic (I2 L) and linear circuitry permits fabrication of a highly dense analog-to-digital (A-to-D) converter. The heart of the A-to-D converter is a linear-I2 L plurality of high density variable curren... | 12/08/1981 |
| 4225854 | High density analog-to-binary coded decimal converter The combination of integrated injection logic (I2 L) and linear circuitry permits fabrication of a highly dense analog-to-binary coded decimal (A-to-BCD) converter. The heart of the A-to-BCD converter is a linear-I2 L plurality of hi... | 09/30/1980 |
| 4178584 | Integrated injection logic digital-to-analog converter employing feedback regulation and method A digital-to-analog converter circuit suitable for implementation as an integrated circuit in integrated-injection-logic form, and a method for regulating the collector current in a plurality of integrated-injection-logic transistors are disclosed. A plur... | 12/11/1979 |
| 3961326 | Solid state digital to analog converter An integrated-circuit 12-bit digital-to-analog converter comprising binarily-scaled constant-current sources with associated switch cells employing bipolar transistors to direct the bit currents either to a summing bus or to ground. The switch cells inclu... | 06/01/1976 |
