MCP6XXXEV-AMP4【PDF 14/30 页】BOARD AMPLIFIER EVAL 4 MCP6XXX

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MCP6XXX Amplifier Evaluation Board 4 User’s Guide

2.3.2

Inverting Integrator

? It integrates and inverts a voltage with an integrating frequency ω =1/R 1 C 1

(rad/s). Additional components control output clipping (wind-up) and initialization

of the integrating capacitor (C 1 ). Refer to Figure 2-1.

? Figure 2-5 shows the circuit diagram for the inverting integrator block.

C U1 = 0.1 uF, R 4 = R 5 = 100.0 Ω, M 1 is N-MOSFET, R 3 = R 1 //R 2

Note 1:

2:

Adding R 2 to avoid the integrator output clipping at DC.

Adding R 3 to minimize the output error due to the input bias current

V DD

Inverting Integrator

V R

V IN

R 3

R 1

C U1

U1

C 1

R 2

V OUT

V CN T

JP 3

#1

#2

R5

100 Ω

M 1

JP 4

#1

#2

R 4

100 Ω

FIGURE 2-5:

Inverting Integrator Block.

Table 2-1 shows the jumper positions and the corresponding effects

TABLE 2-1:

JUMPER POSITIONS AND EFFECTS

Jumper

JP 1

JP 2

JP 3 , JP 4

Position

1

2

1

2

3

1

2

Effect

Set the Input Reference (V REF ) to 0.5V DD

Set the Input Reference (V REF )) to 0.1V DD

Drive Integrator with Comparator

Ground Integrator ’s Resistor (contstant input current)

Drive Integrator with External Source

Ground (de-activate) Integrator ’s Reset Switch (M 1 )

Drive Integrator ’s Reset Switch (M 1 ) with Comparator

Table 2-2 shows the integrator control strategies

TABLE 2-2:

INTEGRATOR CONTROL STRATEGY

Integrator Control

Strategy

JP1

Jumper Positions

JP2 JP3 JP4

Integrator ’s Input

Voltage

R2 (Integrator)

Feedback Loop (1)

1

1

1

1

VCMP (internal)

open

2

1

1

1

Reset Switch (2)

Stand Alone

2

1

2

3

2

1

2

1

GND (internal)

VINX

open

>> R1

2

3

1

1

DS51681A-page 10

Note 1:

2:

The circuit shown uses a non-inverting comparator to close the feedback loop.

The reset switch (MOSFET) in the circuit is controlled by a non-inverting

comparator.

? 2007 Microchip Technology Inc.

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