Analog-to-digital converter of an annular configuration

Details Analog-to-digital converter of an annular configuration Analog-to-digital converter of an annular configuration

1992-12-14

1994-05-31

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 134

Patent

active

053173120

ABSTRACT:
An A/D converter main body is formed in the form of an annulus with a wiring region set as its center, and a ladder resistor array for dividing an input reference voltage and an analog signal line for applying an input analog signal to each comparator in the A/D converter are formed in the form of an annulus with the wiring region set as a center. Wirings from terminals are once concentrated into the wiring region by an input/output line group and then distributed therefrom to circuit elements. Since the ladder resistor array is formed in a circular form, resistance values are less liable to change as compared to the case where the ladder resistor array is bent, resulting in a higher precision of reference voltages for comparison. Further, wiring lengths for control signals to be applied to the circuit elements are made equal, and there is no fear of line delays in the control signals.

REFERENCES:
patent: 3614775 (1971-10-01), Brean
patent: 4034363 (1977-07-01), Van Etten et al.
patent: 4364029 (1982-12-01), Villa
"An 8-bit High Speed CMOS A/D Converter", by T. Kumamoto et al., IEEE Journal of Solid-State Circuits, vol. SC-21, No. 6, Dec. 1988, pp. 976-982.

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