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| Number | Title | Issue Date |
| 4620179 | Method for successive approximation A/D conversion A method of successive approximation A/D conversion employing an N bit internal D/A converter and an N bit SAR is provided wherein the first X bits are approximated to within less than the desired accuracy for N bit successive approximation while the last... | 10/28/1986 |
| 4598269 | Method and apparatus for processing an analog signal In an apparatus for processing an analog signal, a successive approximation ADC comprises a successive approximation register and a DAC. The final digital signal generated by the ADC is applied to digital processing equipment, such as a digital delay, and... | 07/01/1986 |
| 4594576 | Circuit arrangement for A/D and/or D/A conversion with nonlinear D/A conversion In an analog-to-digital (A/D) converter or a digital-to-analog (D/A) converter, a nonlinear D/A converter is employed. The nonlinear D/A converter comprises an absolute value circuit, a D/A converter, and another D/A converter having a function of multipl... | 06/10/1986 |
| 4593270 | Successive approximation analog to digital converter An analog-to-digital converter is used in conjunction with a digital to analog converter and a comparison network to provide a group of digital signals that, when applied to a digital-to-analog converter, produce an output signal approximating an applied ... | 06/03/1986 |
| 4586026 | Infrared gas analyzer using count quadrature sampling The percentage gas concentration within a sample as measured in a conventional optical bench is derived from the composite signal of the reference beam and sample beam transmitted through a sample cell in the optical bench. The primary source, which gener... | 04/29/1986 |
| 4584560 | Floating point digitizer In a floating point digitizer, an analog signal is delivered to two signal paths. One includes a delay line. In the first path, the analog signal is measured in terms of order of magnitude to provide a signal indicative of an exponent. This same value is ... | 04/22/1986 |
| 4581602 | Wide dynamic range analog to digital converter for AC signals A circuit for logarithmic analog to digital conversion is disclosed. An alternating current (AC) input signal of unknown level is logarithmically amplified, detected, and compared to an AC reference signal having a variable level and similarly amplified a... | 04/08/1986 |
| 4580126 | Method of testing analog/digital converter and structure of analog/digital converter suited for the test A method of testing a successive comparison type analog/digital converter which incorporates a voltage comparator, a register for successive comparison and a digital/analog converter. A reference digital signal is inputted to the incorporated digital/anal... | 04/01/1986 |
| 4578667 | Digital acquisition system including a high-speed sampling gate A digital acquisition system includes a high-speed sampling gate with analog memory for sampling input signals. The samples are converted to digital representations and stored in a digital memory. The digital representations are selectively recalled from ... | 03/25/1986 |
| 4559523 | Analog to digital converter An analog to digital converter is disclosed, in which an analog input voltage is converted by a first analog to digital converter to a digital signal of m-bits, the digital signal is code-converted to a digital signal, this code-converted digital signal i... | 12/17/1985 |
| 4555692 | Error correcting apparatus for systems such as analog to digital converters In a recirculation of remainder type analog to digital converter, successive remainders recirculated to develop an output digital signal are overlapped to cancel common error components.... | 11/26/1985 |
| 4553128 | Analog-to-digital converter This analog-to-digital converter includes a comparator (20) to which the samples X.sub.(n) of the signal to be converted, are applied. The output of the comparator controls a logic circuit (22) producing (N+1) bits to a digital-to-analog converter (24) th... | 11/12/1985 |
| 4527148 | Analog-digital converter An A/D converter used with an A/D conversion system in which each of input analog signals applied thereto is amplified at a gain selected depending or the level of said each signal and subjected to A/D conversion. The A/D converter is arranged to select a... | 07/02/1985 |
| 4518949 | Method of A/D conversion by successive approximations An approximation control code is initially set to logic "1" except for the MSB which is set to logic "0". At the m-th comparison, if a sampled analog signal is greater than a comparison reference signal proportional to the control code, the m-th and (m+1)... | 05/21/1985 |
| 4511883 | A-D Converter for use in an electronic balance An A-D converter for use in an electronic balance including an A-D converting unit, a pulse-modulating D-A converting unit, a digital memory, a digital adder, an analog subtracter and means for generating a signal whose level corresponds to an integral mu... | 04/16/1985 |
| 4498072 | A/D Converter having a self-bias circuit A self-bias circuit is employed for automatically changing the reference voltage of a comparator of an A/D converter of successive approximation type. The self-bias circuit is responsive to a voltage at a summing point where an input analog signal, an off... | 02/05/1985 |
| 4490713 | Microprocessor supervised analog-to-digital converter An analog-to-digital converter which is supervised by a microprocessor and includes means for digitally compensating for initial gain and offset errors and gain and offset drift errors due to temperature variations. An analog input voltage is applied to a... | 12/25/1984 |
| 4431987 | Analog-to-digital and digital-to-analog converters and methods of operation A method and apparatus for converting between analog signals and corresponding digital signals that is accurate relative to the actual value of the input signal, and not relative to the upper limit on the analog input signal. The method and apparatus are ... | 02/14/1984 |
| 4333075 | An analog-to-digital converter accurate relative to the value of the input signal A method and apparatus for converting between analog signals and corresponding digital signals that is accurate relative to the actual value of the input signal, and not relative to the upper limit on the analog input signal. The method and apparatus are ... | 06/01/1982 |
| 4315253 | Error correction in recirculating remainder analog-to-digital converters A recirculating remainder analog-to-digital conversion method and apparatus are disclosed for converting an analog signal into a digitally encoded signal representing the analog signal as two or more digits in a selected number base. Conversion is based o... | 02/09/1982 |
| 4119960 | Method and apparatus for sampling and holding an analog input voltage which eliminates offset voltage error A sample and hold circuit uses two amplifiers the second being a Miller integrator and the first a comparator which compares the feed back stored capacitor voltage to the sampled voltage to bring the stored voltage of the capacitor to the sample voltage v... | 10/10/1978 |
| 3971015 | Recirculating type analog to digital converter An analog to digital converter includes a comparator coupled to a cascade having in serial connection an analog switch, a time delay and an algorithmic coder. The algorithmic coder generates a signal at a first output which is an inverse of a signal appea... | 07/20/1976 |
| 3956746 | Successively ranged A/D converter with error correction An analog-to-digital conversion circuit of the type employing a feedback-type, successive subranging mode of operation is provided. The circuit achieves bipolar input capability using an internal subranging A/C converter which has only a unipolar capabili... | 05/11/1976 |
| 3938188 | Analog to digital converter An analog-to-digital converter, finding particular application in a multichannel pulse height analyzer, includes means for digitizing the analog input in two conversion steps. To digitize the input to 13 bits, a 7-bit digital to analog converter (DAC) wit... | 02/10/1976 |
