LOW-VOLTAGE OPERATIONAL AMPLIFIER AND ITS METHOD

PROBLEM TO BE SOLVED: To provide a conventional operational amplifier receiving its power from a battery. SOLUTION: The low-voltage operational amplifier 10 is operated at a voltage range of 1-8V over a temperature range of 0 to 70 deg.C. An input stage 12 employs an N-channel depletion mode MOSFET,...

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Bibliographic Details
Main Authors PETTY THOMAS D, DOTSON ROBERT N, GRIFFITH RICHARD S, VYNE ROBERT L
Format Patent
LanguageEnglish
Published 20.02.1998
Edition6
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Summary:PROBLEM TO BE SOLVED: To provide a conventional operational amplifier receiving its power from a battery. SOLUTION: The low-voltage operational amplifier 10 is operated at a voltage range of 1-8V over a temperature range of 0 to 70 deg.C. An input stage 12 employs an N-channel depletion mode MOSFET, to amplify differential inputs and for maintaining a prescribed mutual conductance. A source follower MOSFET 13 provides a single gain to a base of a current sink transistor(TR) 18 in the transfer of an AC signal 'stage 1 output'. A sink control circuit 14 and a source-control circuit 22 generate a base drive current in TRs 18, 24. The input signal controls the sink TR through an AC signal path for a 'sink path' signal or a 'source path' signal is generated through a trans-linear loop 16. An output stage provides a sink and source current of about 50mA.
Bibliography:Application Number: JP19970085643