Adjustable constant flow source circuit
The utility model discloses an adjustable constant flow source circuit comprising an operation amplifier, grid electrodes and transistors. A positive-phase input end of the operation amplifier is connected with reference voltage VREF, and the transistor is coupled with an output end of the operation...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The utility model discloses an adjustable constant flow source circuit comprising an operation amplifier, grid electrodes and transistors. A positive-phase input end of the operation amplifier is connected with reference voltage VREF, and the transistor is coupled with an output end of the operation amplifier. The adjustable constant flow source circuit is characterized in that the output end of the operation amplifier is respectively connected with grid electrodes of the transistors through switches SB , SB ...and SB, source electrodes of the transistors are respectively connected with detecting resistors RS , RS ... and RS, and all first ends of the detecting resistors RS , RS ...and RS are grounded, and all second ends of the detecting resistors RS , RS ...and RS are connected with a negative-phase input end of the operation amplifier. The adjustable constant flow source circuit is simple in structure and lower in cost. |
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