A/D Converter with bit extension capability using wired-OR outpu

Details A/D Converter with bit extension capability using wired-OR outpu A/D Converter with bit extension capability using wired-OR outpu

1981-08-13

1985-04-02

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347M, H03K 1302

Patent

active

045090360

ABSTRACT:
A parallel comparator includes a plurality of comparator portions each having first and second transistors differentially connected. The first transistors have their bases connected to receive an analog input signal, whereas the second transistors have their bases connected to receive reference voltages having different levels. Among the plural comparator portions, the collector of the first transistor and the collector of the second transistor are connected with a load in accordance to a predetermined rule. An A/D converter for converting an analog input signal into digital signals of plural codes is also provided which includes a critical detecting comparator for generating a detection output at a predetermined level when the digital signals of the plural codes are converted into such an analog signal as effects the overflow or underflow. The A/D converter includes a control circuit for forcibly controlling the levels of the digital signals of the plural bits in case the detection output of the critical detecting comparator reaches a predetermined level.

REFERENCES:
patent: 3829853 (1974-08-01), Freedman
Schmid, Electronic Analog/Digital Conversions, Van Nostrand Reinhold Co., 1970, pp. 343-348.
Pressman, Design of Transistorized Circuits for Digital Computers, John F. Rider, Inc., 1959, pp. 1-6 & 1-7.
Glincman, CMOS/MOS Flash ADC Speeds on Low Power for Low Cost, Electronic Design, 11/1980, pp. 227-231.

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