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Installation and Operation
2.4.2.2
TRANSIENT RESPONSES
This inverting summing amplifier was built, and its responses were measured. A
MCP6021 op amp, 1% resistors, and 5% capacitors were used. Notice how close the
measured and simulated data are.
2.4.2.2.1
Transient Step Response
In Bench Measurement:
? Set V IN with a step amplitude of 1.4V and a center voltage of 2.5V. (i.e. V IN starts
0.7V below center and ends 0.7V above center)
? The measured step response is shown in Figure 2-15. It is a signal with a step
amplitude of 4.2V and a center voltage of 2.5V. (i.e. V OUT starts 2.1V above center
and ends 2.1V below center)
Note:
The center voltage of V IN is set at V REF = V DD /2 (For V DD = 5.0V,
V REF = 2.5V)
V IN = 3.2V
V REF = 2.5V
V OUT = 0.4V
FIGURE 2-15:
? 2007 Microchip Technology Inc.
Measured Step Response.
DS51668A-page 17
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