Circuit for improving A/D conversion precision
The invention relates to a circuit for improving A/D conversion precision. The circuit comprises a first-stage operational amplifier A and a second-stage operational amplifier B, the positive input end of the first-stage operational amplifier A is connected with analog voltage Vin to be subjected to...
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| Format: | Patent |
| Sprache: | chi ; eng |
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| Zusammenfassung: | The invention relates to a circuit for improving A/D conversion precision. The circuit comprises a first-stage operational amplifier A and a second-stage operational amplifier B, the positive input end of the first-stage operational amplifier A is connected with analog voltage Vin to be subjected to A/D conversion through a resistor R1, the positive input end of the first-stage operational amplifier A is further grounded through a resistor R2, the negative input end of the first-stage operational amplifier A is connected with analog voltage Vref output by D/A in an MCU through a resistor R3, and the negative input end of the first-stage operational amplifier A is further connected with the output end of the first-stage operational amplifier A through a resistor R4; the output end of the first-stage operational amplifier A is connected with the positive input end of the second-stage operational amplifier B, the negative input end of the second-stage operational amplifier B is connected with the output end of t |
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