Coded data generation or conversion – Analog to or from digital conversion – With particular solid state devices
Patent
1986-10-27
1989-08-22
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
With particular solid state devices
341159, H03M 136
Patent
active
048600113
ABSTRACT:
First and second reference voltages of different value are introduced to opposite ends of a first line disposed on an IC chip and made from a suitable material (e.g. ion-implanted polysilicon). An input voltage having a value between such reference voltages is provided on a second line on the chip. The second line may be substantially parallel to the first line and made from a suitable material (e.g. polysilicon heavily implanted with ions) to provide an identical voltage at every line position. Bridging layers substantially perpendicularly disposed between the lines at progressive positions on the lines may be made from polysilicon heavily implanted with ions. The magnitudes of the line and reference voltages at each bridging layer are compared in a differential amplifier to produce a signal with a polarity dependent upon such relative magnitudes. The signals from the differential amplifiers are combined in pluralities of logical networks. Each network includes two series transistors, one receiving the signal from one comparator with a relatively low reference voltage to produce a signal with a first logic level and the other receiving the signal from another comparator with an increased reference voltage to produce a signal with a second logic level. Each network has a binary significance dependent upon the relative values of the binary signals introduced to the transistors in the network. The networks of each binary significance are connected to a binary bit line of corresponding binary significance to produce on such line a signal representing the input voltage.
REFERENCES:
patent: 4150366 (1979-04-01), Price
patent: 4596978 (1986-06-01), Fujita
Analog-Digital Conversion Notes, Analog Devices Inc., 1980, pp. 125, 126.
Microelectronic Circuits, Holt, Rinehart, and Winston, 1982, pp. 437,438,729,764,765.
Brooktree Corporation
Hoff Marc S.
Roston Ellsworth R.
Schwartz Charles H.
Shoop Jr. William M.
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