 English |
|
|
|
|
|
|
|
| MCP6V71 Datasheet, PDF (24/46 Pages) Microchip Technology – Portable Instrumentation | |||
| |||
| ◁ |
MCP6V71/1U/2/4
4.4.3 OFFSET VOLTAGE CORRECTION
Figure 4-13 shows MCP6V71 (U2) correcting the input
offset voltage of another op amp (U1). R2 and C2
integrate the offset error seen at U1âs input; the
integration needs to be slow enough to be stable (with
the feedback provided by R1 and R3). R4 and R5
attenuate the integratorâs output; this shifts the
integrator pole down in frequency.
R1
VIN
R2
R2
VDD/2
R3
VOUT
C2
R4
R5
U2
MCP6V71
U1
MCP6XXX
VDD/2
FIGURE 4-13:
Offset Correction.
4.4.4 PRECISION COMPARATOR
Use high gain before a comparator to improve the
latterâs performance. Do not use MCP6V71/1U/2/4 as
a comparator by itself; the VOS correction circuitry does
not operate properly without a feedback loop.
VIN
R1
U1
MCP6V71
R2
VDD/2
FIGURE 4-14:
R3
R4 R5
VOUT
U2
MCP6541
Precision Comparator.
DS20005385B-page 24
ï£ 2015 Microchip Technology Inc.
|
▷ |
German
Russian
Spanish
Italian
Polish
Chinese
Japanese
Korean
French
Portuguese