Low voltage operational amplifier input stage 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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| Main Authors | , , |
|---|---|
| Format | Patent |
| Language | English |
| Published |
31.03.1998
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| Edition | 6 |
| Subjects | |
| Online Access | Get full text |
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| Abstract | 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) generate the base drive currents for transistors (18) and (24). The signal at the output of MOSFET (13) either causes the sink transistor (18) to sink current or the signal to be transposed by means of a translinear loop (16) and causes the source transistor (24) to source current. An output stage provides approximately fifty milliamps of current drive and is quiescent until the output driver is selected. |
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| AbstractList | 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) generate the base drive currents for transistors (18) and (24). The signal at the output of MOSFET (13) either causes the sink transistor (18) to sink current or the signal to be transposed by means of a translinear loop (16) and causes the source transistor (24) to source current. An output stage provides approximately fifty milliamps of current drive and is quiescent until the output driver is selected. |
| Author | VYNE; ROBERT L GRIFFITH; RICHARD S DOTSON; ROBERT N |
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| Notes | Application Number: US19960618671 |
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| PublicationDate | 19980331 |
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| RelatedCompanies | MOTOROLA, INC |
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| Snippet | 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... |
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| SubjectTerms | AMPLIFIERS BASIC ELECTRONIC CIRCUITRY ELECTRICITY |
| Title | Low voltage operational amplifier input stage and method |
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