Folding type A/D converter and folding type A/D converter circui

Details Folding type A/D converter and folding type A/D converter circui Folding type A/D converter and folding type A/D converter circui

1998-08-07

2000-05-30

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341155, H03M 112

Patent

active

06069579&

ABSTRACT:
An A/D converter simplifies its circuit configuration without deteriorating accuracy in A/D conversion. A circuit is formed of a folding and interpolation type. A gain-variable pre-amplifier group 11 amplifies each of reference voltages Vref1 to VrefN and an analog input voltage Vin, to output the result to a folding amplifier group 12, while a gain-variable pre-amplifier group 21 amplifies each of reference voltages Vrr1 to VrrJ and the analog input voltage Vin, to output the result to a comparator group 24. Each of pre-amplifiers constituting the gain-variable pre-amplifier groups 11 and 21 has an amplification factor that varies in upper and lower comparison periods according to a clock control signal .PHI.cnt.

REFERENCES:
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patent: 5682163 (1997-10-01), Hsu
patent: 5841389 (1998-11-01), Kinugasa et al.
Shiro Hosotani, et al., "An 8-BIT 20-MS/s CMOS A/D Converter with 50-mW Power Consumption", IEEE Journal of Solid-State Circuits, vol. 25, No. 1, Feb. 1990, pp. 167-172.
Rudy J. Van De Plassche, "AN 8-BIT 100-MHZ Full-Nyquist Analog-to-Digital Converter", IEEE Journal of Solid-State Circuits, vol. 23, No. 6, Dec. 1988, pp. 1334-1344.

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