An analog-to-digital converter accurate relative to the value of

Details An analog-to-digital converter accurate relative to the value of An analog-to-digital converter accurate relative to the value of

1980-03-27

1982-06-01

Sloyan, Thomas J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03K 1302

Patent

active

043330754

ABSTRACT:
A method and apparatus for converting between analog signals and corresponding digital signals that is accurate relative to the actual value of the input signal, and not relative to the upper limit on the analog input signal. The method and apparatus are disclosed in terms of a serial-feed-back A/D converter that performs an A/D conversion through a plurality of cycles equal in number to the number of bits in the digital output word. In each cycle a comparison voltage is tested to determine if the bit output for the cycle is high or low. The comparison voltage is the amplified difference of the comparison voltage for the preceding cycle and another reference signal. The scale factor for the amplification of the difference between the two signals is one value if the bit value for the preceding cycle was high, and another complementary value if the bit value for the preceding cycle is low. The companion method and apparatus for converting a non-binary digital signal into a corresponding analog signal is also disclosed.

REFERENCES:
patent: 3588881 (1971-02-01), Gordon
patent: 3745555 (1973-06-01), Carbrey
patent: 3790910 (1974-02-01), McCormack
patent: 3936819 (1976-02-01), Angelle et al.
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 247-256.
The Engineering Staff of Analog Devices, Inc., Analog-Digital Conversion Handbook, 6/1972, pp. I-64 & I-65.
Schmid, A/D Converters, Part 1, Electronic Design 25, 12/68, pp. 58-72.

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