Comparator with extended common-mode input voltage range

Details Comparator with extended common-mode input voltage range Comparator with extended common-mode input voltage range

1988-04-20

1990-03-06

Hix, L. T.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

Systems for magnetizing, demagnetizing, or controlling the...

307360, 123490, H01H 900

Patent

active

049071211

ABSTRACT:
A comparator comprising two differential input stages (Q1 to Q4 and Q5 to Q8) which are connected in parallel and fed by a common constant circuit source (Q.sub.B) whose current is passed either to both or only to the one or only to the other differential input stage, depending on whether the common-mode input voltage of the comparator is within, above or below a voltage range that is between the voltage values of the two poles (VC, VE) of a supply voltage source (B) of the comparator, and comprising a common current mirror circuit (Q9, Q10) which is associated with the outputs of both differential input stages and from which the comparator output signal is derived. At least one (Q1 to Q4) of the two differential input stages operates in common-base connection, with this differential input stage (Q1 and Q4) receiving its supply current from the common-mode input voltage source.

REFERENCES:
"Low-Voltage Operational Amplifier with Rail-to-Rail Input and Output Ranges", Johan H. Huijsing and Daniel Linebarger, IEEE Journal of Solid-State Circuits, vol. SC-20, No. 6, Dec. 1985.

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