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MCP6V92 Datasheet(PDF) 24 Page - Microchip Technology |
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MCP6V92 Datasheet(HTML) 24 Page - Microchip Technology |
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24 / 48 page  MCP6V91/1U/2/4 DS20005434B-page 24 2015-2016 Microchip Technology Inc. 4.4.3 OFFSET VOLTAGE CORRECTION Figure 4-13 shows MCP6V91 (U2) correcting the input offset voltage of another op amp (U1). R2 and C2 integrate the offset error seen at U1’s input. The integration needs to be slow enough to be stable (with the feedback provided by R1 and R3). R4 and R5 attenuate the integrator’s output. This shifts the integrator pole down in frequency. FIGURE 4-13: Offset Correction. 4.4.4 PRECISION COMPARATOR Use high gain before a comparator to improve the latter’s performance. Do not use MCP6V91/1U/2/4 as a comparator by itself; the VOS correction circuitry does not operate properly without a feedback loop. FIGURE 4-14: Precision Comparator. U1 MCP6XXX C2 R2 R1 R3 VDD/2 R4 VIN VOUT R2 VDD/2 R5 U2 MCP6V91 + - + - VIN R3 R2 VDD/2 VOUT R5 R4 R1 U1 MCP6V91 U2 MCP6541 + - + - |
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