Low Voltage operational amplifier and method

Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0 DEG to 70 DEG centigrade. Op amp input stage (12) uses N-channel depletion-mode MOSFETs to provide amplification of the differential input and maintain constant transconductance. So...

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Bibliographic Details
Main Authors VYNE, ROBERT L, GRIFFITH, RICHARD S, PETTY, THOMAS D, DOTSON, ROBERT N
Format Patent
LanguageEnglish
French
German
Published 24.09.1997
Edition6
Subjects
AMPLIFIERS
BASIC ELECTRONIC CIRCUITRY
ELECTRICITY
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Summary:Low voltage operational amplifier (10) operates in a voltage range of one to eight volts over a temperature range of 0 DEG to 70 DEG centigrade. Op amp input stage (12) uses N-channel depletion-mode MOSFETs to provide amplification of the differential input and maintain constant transconductance. Source follower MOSFET (13) provides unity gain in transferring the AC signal, STAGE-1 OUTPUT, to the base of current sinking transistor (18). Sink control circuit (14) and source control circuit (22) create the base drive current in transistors (18) and (24). Dependent on the input signal the AC signal path on SINK PASS THROUGH signal controls op amp output sink transistor to sink current or through translinear loop (16) causes SOURCE PASS THROUGH signal controlling op amp output source transistor to source current. An output stage provides approximately fifty milliamps of sink and source current.
Bibliography:Application Number: EP19970104329