High-precision voltage reference circuit
The invention discloses a high-precision voltage reference circuit which comprises an operational amplifier LM2904, a controllable precise voltage stabilizing source TL431 is placed at the front end of the operational amplifier LM2904, the output end of the operational amplifier LM2904 is connected...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention discloses a high-precision voltage reference circuit which comprises an operational amplifier LM2904, a controllable precise voltage stabilizing source TL431 is placed at the front end of the operational amplifier LM2904, the output end of the operational amplifier LM2904 is connected with the cathode of the controllable precise voltage stabilizing source TL431, the positive input end of the operational amplifier LM2904 is connected with the reference electrode of the controllable precise voltage stabilizing source TL431, and the negative input end of the operational amplifier LM2904 is connected with the reference electrode of the controllable precise voltage stabilizing source TL431. The reverse input end of the operational amplifier LM2904 and the anode of the controllable precise voltage stabilizing source TL431 are both grounded. A stable constant current source is provided for the LT431 through the LM2904, and the fluctuation range of the reference voltage output by the TL431 is reduced, s |
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