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| Number | Title | Issue Date |
| 7443176 | Test mode and test method for a temperature tamper detection circuit An integrated circuit temperature sensor includes a sensor to determine whether the integrated circuit is currently exposed to a relatively low or high temperature. A measured voltage across the base-emitter of a bipolar transistor is selected if the sensor indicate... | 10/28/2008 |
| 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 |
| 7369077 | Differential current-steering digital-to-analog converter Differential, current-steering DACs with reduced small signal differential non-linearity. A set of binary-weighted steerable constant current generators is used in which each constant current generator comprises a ternary constant current generator configured to gen... | 05/06/2008 |
| 7362248 | Temperature tamper detection circuit and method A sensing circuit determines whether an integrated circuit is currently exposed to one of a relatively low or a relatively high temperature. A selection circuit selects a measured voltage across the base-emitter of a bipolar transistor if the sensing circuit indicat... | 04/22/2008 |
| 7348912 | High resolution and low consumption digital-to-analog converter A digital-to-analog converter includes a first section (MSB) that converts the more significant bits of a digital code into a first voltage (Vin) of a multiplicity of discrete voltages that are integral multiples of a predetermined first voltage step (ΔV1). ... | 03/25/2008 |
| 7348847 | Integrated implementation of a collector boost scheme and method therefor A collector boost circuit is disclosed for providing a first voltage in a first mode of operation to a power amplifier, and a second voltage in a second mode of operation to the power amplifier. The collector boost circuit uses a switch and an indicator signal for t... | 03/25/2008 |
| 7317409 | Apparatus and method for interfacing time-variant signals An improved apparatus and method for interfacing a time variant waveform between two hardware environments. In one aspect, the invention comprises a circuit for accurately simulating the output of one or more types of sensing device (e.g., passive bridge pressure tr... | 01/08/2008 |
| 7245519 | Digitally programmable capacitor array A programmable capacitor array does not require separate switching transistors because the capacitors themselves have a switchable capacitance, which capacitors are made in the manner of regular N channel transistors with their source/drains connected to each other.... | 07/17/2007 |
| 7236111 | Linearizing methods and structures for amplifiers Methods and structures are provided to enhance the linearity of amplifiers such as those which include a complementary common-collector amplifier stage. The methods and structures configure this stage so that each transistor of the stage drives an output port throug... | 06/26/2007 |
| 7165134 | System for selectively generating real-time interrupts and selectively processing associated data when it has higher priority than currently executing non-real-time operation A method is disclosed. The method includes receiving real-time data at a personal computer implementing a general purpose operating system, generating a real-time event at the personal computer and determining whether the real-time event has a higher priority than a... | 01/16/2007 |
| 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 |
| 7102441 | Variable gain amplifying circuit A variable gain amplifying circuit, which applies a resistor ladder to obtain a more precise gain, is disclosed. The amplifying circuit includes an input, an operational amplifier (op-amp), a resistor unit and a feedback resistor. The feedback resistor is coupled be... | 09/05/2006 |
| 7098648 | Automatic range finder for electric current testing In an electrical circuit for testing electrical current using a plurality of precision resistors connected in parallel or in series, a range finder for receiving the current to be measured with the voltage drop across the range finder being indicative of a current s... | 08/29/2006 |
| 7072779 | Power management integrated circuit A power management integrated circuit for monitoring a parameter of a power system includes sensor interface circuitry, first logic, at least one random access memory, second logic, and a communication interface. The sensor interface circuitry is operative to receiv... | 07/04/2006 |
| 7030790 | Systems and methods for auto gain control in Bi-CMOS digital to analog converters The accuracy of output power in a digital-to-analog converter (DAC) is critical in certain applications. When bi-CMOS technology is used to implement a DAC, a number of factors affect the gain accuracy of the DAC. The present invention provides a circuit architectur... | 04/18/2006 |
| 6927714 | Current steering digital-to-analog (DAC) converter with improved dynamic performance A current steering digital-to-analog (DAC) having improved dynamic performance and output signal quality (i.e. improved SFDR characteristic). The DAC includes current steering segments each having differential transistors to steer a current from a summing node to ei... | 08/09/2005 |
| 6917322 | I/V converter circuit and D/A converter In an I/V converter circuit and a D/A converter, a wide pass band for signal can be obtained and current consumption can be reduced. A current is supplied through an input terminal to a first node, and a first bias current is supplied from a first bias-current gener... | 07/12/2005 |
| 6888485 | Digital-analog converter A digital-analog converter for mobile radiotelephone base stations includes a D flip-flop and a modulator. The D flip-flop is clocked by a clock signal and a digital input signal is fed to an input of the D flip-flop to produce an output signal. The modulator multip... | 05/03/2005 |
| 6744391 | System for sampling a signal in an electronic instrument using a unipolar A/D converter The system includes a unipolar A/D converter, which samples analog signal inputs thereto, the A/D converter being used in a protective relay for electric power systems. The unipolar A/D converter is responsive to input voltage values and current values from the powe... | 06/01/2004 |
| 6674380 | Digital-phase to digital amplitude translator with first bit off priority coded output for input to unit weighed digital to analog converter Differential heating is avoided by a digital to analog converter for generating analog cyclical waveforms having a period. The cyclical waveforms are generated by conversion of a sequence of step wise linearly incrementing digital phase words presented du... | 01/06/2004 |
| 6492929 | Analogue to digital converter and method of analogue to digital conversion with non-uniform sampling An analogue to digital converter generating at least two threshold levels and a comparator for comparing each of the levels with the input signal and generating a primary digital output signal to provide an indication that the input signal has crossed one... | 12/10/2002 |
| 6369743 | Differential amplifier, comparator, and A/D converter An OTA circuit is disposed between a differential pair composed of NMOS transistors and an NMOS follower transistor that composes an output buffer circuit. The OTA circuit generates a compensation current that is equal to a current that flows in a capacit... | 04/09/2002 |
| 6346902 | Analog to digital converter An analog to digital converter has a differential input arrangement with a static reference ladder and comparators for comparing the differential input signal with respective reference voltages from the ladder. For sensing the positive and the negative va... | 02/12/2002 |
| 6246353 | Integrated-circuit structures and methods for correction of temperature and process-induced parameter errors Integrated-circuit structures and methods are provided for generating an error signal that represents temperature and process-induced signal changes in transistor parameters. In particular, a reference transistor and a sense transistor are biased to each ... | 06/12/2001 |
| 5990817 | A/D conversion device having a programmable transfer characteristic The invention relates to an A/D conversion device intended to supply at the output a digital signal Vout[0:7] resulting from the conversion of an analog input voltage Vin and receiving a control signal CRS used for defining the transfer characteristic of ... | 11/23/1999 |
| 5805095 | Two's complement digital to analog converter A two's complement digital to analog converter (300) is for converting a two's complement binary value to an analog output current, and includes a control circuit (310) which generates controlled value bits, a digital to analog current converter (DACC) (3... | 09/08/1998 |
| 5670951 | Radio communication device and method for generating threshold levels in a radio communication device for receiving four-level signals A symbol detector (110) includes an analog-to-digital converter (115) for converting signal voltages to digital values and peak and valley counters (310, 315) for tracking the digital values to determine peak and valley values associated with high and low... | 09/23/1997 |
| 5661480 | Analog-to-digital converters with reduced power and area using offset current compensation An integrated circuit is disclosed including an analog-to-digital (A/D) converter having an offset source for providing an offset signal; and a first reference array including a plurality of cells for generating a first output signal from an input signal ... | 08/26/1997 |
| 5614904 | Balance companded delta conversion for homodyne receiver A balanced delta-modulation analog-to-digital conversion circuit is disclosed. A first principal integrator produces a first output signal which rises when a first control signal is generated and falls when a second control signal is generated. A second p... | 03/25/1997 |
| 5554988 | Apparatus and method for generating a data signal An apparatus is provided for generating a multiple-level amplitude modulated data signal. The circuit provides accurate data signal level control while minimizing transient errors. A controlling level, relative to an analog reference level is provided. Mu... | 09/10/1996 |
| 5323159 | Digital/analog converter A D/A converter divides an input digital data into at least two overlapping digital ranges. The data in the two ranges are converted separately from digital to analog by a low-range and a high-range DAC. The resulting analog signals are then added with a ... | 06/21/1994 |
| 5296857 | Digital to analog converter with precise linear output for both positive and negative digital input values A circuit and method for converting a digital number to an analog output signal, wherein the most significant bit or "sign" bit of the digital number is used for switching the accumulated currents of the other data bits to a chain of operational amplifier... | 03/22/1994 |
| 5289191 | Bipolar analog-to-digital conversion apparatus with unipolar current and voltage modes An integrated circuit incorporating an analog-to-digital (A/D) conversion subsystem having a current mode in which only negative analog currents are converted and a voltage mode in which only positive analog voltages are converted is adapted to produce bi... | 02/22/1994 |
| 5283583 | High-speed A/D conversion using a series of one-bit conversion stages In an analog-to-digital converter, one-bit A/D conversion stages are connected in series to receive an analog signal. Each conversion stage includes a sample-and-hold circuit for sampling an analog signal from a preceding stage, a comparator for comparing... | 02/01/1994 |
| 5241312 | High resolution analog to digital converter A high resolution analog to digital converter is provided which operates at a relatively high speed. The converter will operate in either a bipolar or unipolar mode and the bipolar mode includes a signal/sign transposer. A sample/holding circuit temporari... | 08/31/1993 |
| 5227791 | East high-bit one step electronic analog-to-digital converter The converter input i is connected through a comparator to the polarity bit output as well as to the input of a full-wave precision rectifier in the first quantization stage, which like further stages comprises an operational amplifier, a comparator and a... | 07/13/1993 |
| 5182561 | Integrated converter with gate for supplying integrating dock pulses to counters only during reference signal integrating period An integrated A/D converter includes an integrator 8integrating reference signals in synchronism with an integration start signal, and counters for counting integrating clock pulses until the integrated value of the integrator reaches a value correspondin... | 01/26/1993 |
| 5157400 | Automatic reference voltage controller of integral analog/digital converter An automatic reference voltage controller of an integral A/D converter comprises a reference voltage switching circuit, an input voltage switching circuit, a Miller integrator, a comparing circuit, a logic circuit, and an automatic reference voltage contr... | 10/20/1992 |
| 5128674 | Two quadrants high speed multiplying DAC A multiplying digital-to-analog converter for multiplying a bipolar input current by a digital word A having N bits ai including a current adder for adding a constant current to the bipolar input current to produce a unipolar current, a first c... | 07/07/1992 |
| 5119094 | Termination circuit for an R-2R, ladder that compensates for the temperature drift caused by different current densities along the ladder, using one type of biopolar transistor A termination circuit for an R-2R ladder network for producing weighted currents, the 2R terminating resistor of the ladder being connected to an excitation source voltage which is 2(kT/q)ln 2 closer to the supply voltage than the emitter of the current s... | 06/02/1992 |
