MCP6071 datasheet(17/42 Pages) MICROCHIP

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DS20002142C-page 17

MCP6071/2/4

4.7

Application Circuits

4.7.1

GYRATOR

The MCP6071/2/4 op amps can be used in gyrator

applications. The gyrator is an electric circuit which can

make a capacitive circuit behave inductively.

Figure 4-8 shows an example of a gyrator simulating

inductance, with an approximately equivalent circuit

below. The two ZIN have similar values in typical

applications. The primary application for a gyrator is to

reduce the size and cost of a system by removing the

need for bulky, heavy and expensive inductors. For

example, RLC bandpass filter characteristics can be

realized with capacitors, resistors and operational

amplifiers without using inductors. Moreover, gyrators

will typically have higher accuracy than real inductors,

due to the lower cost of precision capacitors than

inductors.

FIGURE 4-8:

Gyrator.

4.7.2

INSTRUMENTATION AMPLIFIER

The MCP6071/2/4 op amps are well suited for

conditioning

sensor

signals

battery-powered

applications. Figure 4-9 shows a two op amp

instrumentation amplifier, using the MCP6072, that

works well for applications requiring rejection of

common mode noise at higher gains. The reference

voltage (VREF) is supplied by a low impedance source.

In single supply applications, VREF is typically VDD/2.

FIGURE 4-9:

Two Op Amp

Instrumentation Amplifier.

To obtain the best CMRR possible, and not limit the

performance by the resistor tolerances, set a high gain

with the RG resistor.

4.7.3

PRECISION COMPARATOR

Use high gain before a comparator to improve the

latter’s input offset performance. Figure 4-10 shows a

gain of 11 V/V placed before a comparator. The

reference voltage VREF can be any value between the

supply rails.

FIGURE 4-10:

Precision, Noninverting

Comparator.

MCP6071

VOUT

Gyrator

ZIN

RL jL

LRLRC

ZIN

Equivalent Circuit

VOUT

V1 V2

–

 1

------

2R1

---------





VREF

VREF R1

VOUT

MCP6072

VIN



VOUT

MCP6071

100 k



MCP6541

VREF

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