Integrated circuit sensor circuit

Details Integrated circuit sensor circuit Integrated circuit sensor circuit

1987-05-12

1988-10-25

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307530, 307362, 307491, 307494, 307303, 330252, 330257, 330258, H03K 5153, H03K 524, H03F 345

Patent

active

047806257

ABSTRACT:
An integrated circuit sensor circuit (10) is disclosed which is operable in differential or single-ended modes at DC input potentials which can be below the integrated circuit substrate bias potential (ground). Substrate injection is prevented and the circuit is operable for input signals which can vary relatively widely with respect to the substrate bias potential. This is accomplished even though only a single polarity power supply (+5 volts) with respect to substrate bias potential is used for the integrated circuit. An input stage of an integrated circuit (16) comprises a pair of identical polarity transistors (23, 24) operated in a differential common base mode with an opposite polarity transistor (25) used to supply appropriate bias potential to the common base connection. This prevents substrate injection while maintaining a wide operative range for the sensor circuit. Additional substrate injection preventing circuitry (31) is provided to maintain the collectors of the differential input transistors above the integrated circuit substrate base potential, and input protection circuitry (32-35) is used to limit the magnitude of applied input signals.

REFERENCES:
patent: 4163160 (1979-07-01), Frazee
patent: 4378529 (1983-03-01), Dobkin
patent: 4574221 (1986-03-01), Hess et al.
Data Sheets for Motorola Sense Amplifer MC1440.
Data Sheets for National Semiconductor Voltage Comparator IM111.
Pages 213 and 215 from the Transistor Circuit Analysis and Design Book by Fitchen.

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