Cushman, Darby and Cushman
Analog-to-digital converter
 An analog-to-digital converter including a reference voltage generator for generating coarse and fine reference voltages, a first group of comparators for comparing an analog input voltage with the coarse reference voltages, a second group of comparators and an encoder for encoding outputs of the comparators. The fine reference voltages and the analog input voltage are applied to a plurality of differential amplifiers which are organized into an odd number of groups, each group including an equal number of differential amplifiers. First outputs as well as second outputs of corresponding differential amplifiers of each groups are respectively added to each other. This added first and second output signals are respectively delivered to the second group of comparators. Outputs of the second groups of comparators are selectively inverted based on the outputs of the first group of comparators, thereby the most significant bits (MSB) and the least significant bits (LSB) are obtained in parallel. 
Kabushiki Kaisha Toshiba
H
H03M
inventional
Hisayasu
Yoshizawa