MCP6071-ESLASHST datasheet(18/34 Pages) MICROCHIP

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MCP6071/2/4

DS22142A-page 18

4.7

Application Circuits

4.7.1

GYRATOR

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

applicaitons. The gyrator is an electric circuit which can

make a capacitive circuit behave inductively. Figure 4-

7 shows an example of a gyrator simulating induc-

tance, 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 typi-

cally have higher accuracy than real inductors, due to

the lower cost of precision capacitors than inductors.

FIGURE 4-7:

Gyrator.

4.7.2

INSTRUMENTATION AMPLIFIER

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

tioning sensor signals in battery-powered applications.

Figure 4-8 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 4-8:

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 4-9 shows a

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

reference voltage VREF can be any value between the

supply rails.

FIGURE 4-9:

Precision, Non-inverting

Comparator.

MCP6071

VOUT

Gyrator

ZIN

ωL

LRC

ZIN

Equivalent Circuit

OUT

–

() 1

------

---------

⎝⎠

⎛⎞

REF

VREF R1

VOUT

MCP6072

VIN

VOUT

MCP6071

100 k

MCP6541

VREF

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