Finnegan, Henderson, Farabow, Garrett & Dunner
Integrating analog to digital converter having offset error compensation
 An integrating analog to digital converter having a switching circuit for selecting any one of an analog input voltage, a first reference voltage, or an analog ground voltage; an intermediate voltage selected by the switching circuit and the intermediate voltage generated by the intermediate voltage generating circuit; and a comparator for producing a signal to control the operation of the switching circuit and the voltage level produced by the intermediate voltage generating circuit according to the results of a comparison between the output signal from the integration circuit and a second reference voltage. 
Tokyo Shibaura Denki Kabushiki Kaisha
H H
H03M H03M
additional inventional
Eiji Yasoji
Masuda Suzuki