Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1992-05-13
1994-01-18
Sikes, William L.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307530, 307494, 330253, 330261, H03K 522, H03F 345
Patent
active
052801993
ABSTRACT:
A differential input circuit capable of realizing a wide common mode input range, without using a current summing circuit, in which the total output current is independent of the common mode input voltage level. The circuit includes: a first differential pair formed by two transistors connected to a current source; a second differential pair connected to the current source in parallel to the first differential pair, including two transistor combinations, each of which is formed by two transistors of mutually complementary conductivity/polarity types having source/emitter electrodes connected to each other; in which bias voltages are applied to gate/base electrodes of one of transistors of each transistor combination in the second differential pair which has an identical conductivity/polarity type as the transistors of the first differential pair. The outputs are connected with the first and second differential pairs such that the first and second differential pairs have the same output current direction. Differential and operational amplifier configurations using this differential input circuit are also disclosed.
REFERENCES:
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patent: 4555673 (1985-11-01), Huijsing et al.
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patent: 5185582 (1993-02-01), Barbu
IEEE Journal of Solid-State Circuits, vol. sc-20, No. 6, Dec. 1985, "Low-Voltage Operational Amplifier with Rail-to-Rail Input and Output Ranges"; Johan H. Huijsing, et al. pp. 1144-1150.
IEE Journal of Solid-State Circuits, vol. 25, No. 2, Apr. 1990, "A Rail-To-Rail Input/Output CMOS Power Amplifier"; M. D. Pardoen, et al. pp. 501-504.
Kabushiki Kaisha Toshiba
Sikes William L.
Tran Toan
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