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Flash analog-to-digital converter with logarithmic/linear threshold voltages
| Details |
Inventors: Katzenstein, Henry S.;
Assignee: Brooktree Corporation (San Diego, CA)
Primary Examiner: Shoop, Jr.; William M.
Assistant Examiner: Williams; H. L.
Attorney, Agent or Firm: Roston; Ellsworth R., Schwartz; Charles H.
A plurality of equally spaced terminals may be disposed at a side edge of a substantially uniformly resistive thin film. A reference potential (e.g. ground) may be applied to the second side of the film. An energizing voltage may be applied at the juncture between the first side edge and a particular one of the top and bottom edges of the film. In this way, the successive terminals receive voltages with a logarithmic relationship relative to the terminal positions. When a linear relationship of voltages is desired at successive terminals in a low range, no reference potential is applied to the second side edge of the thin film. Instead, the other one of the top and bottom edges may receive the reference voltage. Alternatively no reference voltage may be applied and terminals indicating the linear voltages may be disposed at such other edge. Each of a plurality of comparators providing an output indicative of the input voltage receives an input voltage and the voltage at an individual one of the successive terminals. The voltages in the logarithmic portion of the thin film may be calibrated by a circuit including a capacitance to indicate voltage deviations from the logarithmic relationship. The successive terminal voltages in the linear portion of the film may be calibrated by the capacitance circuit and a constant current source to indicate voltage deviations from the linear relationship. |
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DETAILED DESCRIPTION What is claimed: 1.
In combination, a member provided with an electrically resistive material on one surface of the member, the member being defined by first and second side edges and top and bottom edges, means for providing a reference voltage on the resistive material along the first side edge of the member, means for providing an energizing voltage on the resistive material at the juncture between the top edge and the second side edge of the resistive material, and means for obtaining an output voltage at progressive positions along the second side edge of the resistive material the progressive positions at the second side edges of the resistive material being substantially equally spaced to provide a logarithmic relationship in the voltage at the progressive position with respect to the positions of such successive terminals.
2.
In a combination as set forth in claim 1, means for providing an input voltage, and means for comparing the input voltage with the output voltage at the progressive positions along the second side edge of the resistive material to provide an indication of the input voltage.
3.
In a combination as set forth in claim 2, the reference voltage being an electrical ground and the energizing voltage being a voltage with a particular magnitude.
4.
In combination a member having a thin resistive film and having a plurality of terminals equally spaced from one another along one edge of the film, means for applying voltages to the thin film to obtain a logarithmic progression of voltages at successive terminals in the plurality with respect to the positions of such successive terminals, and means for calibrating the voltages produced at the successive terminals to determine any deviations in such voltages from the logarithmic progression.
5.
In combination a substantially planar member having first and second opposite edges and having top and bottom edges, an electrically resistive material disposed on the surface of the planar member, a plurality of terminals at equally spaced positions along one of the side edges of the resistive material, and means for applying an energizing voltage to the resistive material to obtain voltages in a magnitude having a logarithmic relationship at the successive terminals along the side edge of the resistive material with respect to the positions of such successive terminals
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