Expanded analog-to-digital converter having one-half LSB shift

Details Expanded analog-to-digital converter having one-half LSB shift Expanded analog-to-digital converter having one-half LSB shift

1978-05-30

1980-04-01

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347DA, H03K 1303

Patent

active

041964209

ABSTRACT:
An expanded analog-to-digital converter includes a first digital-to-analog converter for converting the most significant bits of digital output signal having a given number of bits to a first analog reference signal having a value that is proportional to the value of the most significant bits minus one-half the least significant bit of the digital output signal whenever the value of the most significant bits is other than zero; and a second digital-to-analog converter for converting the least significant bits of the digital output signal to a second analog reference signal. A successive approximation register successively provides the bits of a digital output signal in accordance with a comparison of an analog input signal with the sum of the analog reference signals. A logic circuit coupled to the successive approximation register for providing an indication of whether the value of the most significant bits is other than zero, causes the second analog reference signal to have a value that is proportional to the value of the least significant bits whenever the value of the most significant bits is other than zero, and a value that is proportional to the value of the least significant bits minus one-half the least significant bit of the digital output signal whenever the value of the most significant bits is zero.

REFERENCES:
patent: 3573795 (1971-04-01), Bowers
patent: 3895378 (1975-07-01), Marcel
patent: 3997892 (1976-12-01), Susset

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