Analog to digital converter for highly dynamic signals, using a variable reference voltage to floating decimal point output
Patent 4990913 Issued on February 5, 1991. Estimated Expiration Date: 
January 23, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 23, 2009. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3411153 3585631 3597761 3603972 3699325 3813609 3919657 Digital coder Amplifier for analogue signal samples with automatic gain control, and circuit for digitisation of such samples Multithreshold A/D converter utilizing error amplifiers InventorApplicationNo. 299313 filed on 01/23/1989US Classes:341/139, Automatic control for increasing converter range (e.g., gain ranging, automatic gain control)341/138, Nonlinear341/155Analog to digital conversionExaminersPrimary: Shoop, William M. Jr.Assistant: Williams, Howard L. Attorney, Agent or FirmForeign Patent References
International ClassH03M 001/18Foreign Application Priority Data1988-01-21 FRAbstractAn acquisition device for digitizing highly dynamic signals. After amplification in a fixed gain amplifier, the signals are applied to a sample and hold unit, the output of which is connected to an analog-to-digital converter to which a variable reference voltage is applied. This reference voltage is available at the output of a multiplexer to the inputs of which voltages are applied derived from sub-divisions of a calibrated voltage. The choice of the reference voltage is effected by a logic assembly as a function of the comparisons made by comparators between the sampled voltage and the derived voltages. The digitized signals are represented by a digital word from the converter and a digital word of gain G from the logic assembly.Field of SearchSAMPLE AND HOLDAutomatic control for increasing converter range (e.g., gain ranging, automatic gain control) Multiplex Nonlinear ANALOG TO OR FROM DIGITAL CONVERSION Analog to digital conversion Coarse and fine conversions Analog input compared with static reference Parallel type Including priority encoder | |
