MCP6271RT-ESLASHMS datasheet(15/34 Pages) MICROCHIP

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DS21810E-page 15

MCP6271/1R/2/3/4/5

4.9

Application Circuits

4.9.1

ACTIVE FULL-WAVE RECTIFIER

The MCP6271/1R/2/3/4/5 family of amplifiers can be

used in applications such as an Active Full-Wave

Rectifier or an Absolute Value circuit, as shown in

Figure 4-8. The amplifier and feedback loops in this

active voltage rectifier circuit eliminate the diode drop

problem that exists in a passive voltage rectifier. This

circuit behaves as a follower (the output follows the

input) as long as the input signal is more positive than

the reference voltage. If the input signal is more

negative than the reference voltage, however, the

circuit behaves as an inverting amplifier. Therefore, the

output voltage will always be above the reference

voltage, regardless of the input signal.

FIGURE 4-8:

Active Full-wave Rectifier.

The design equations give a gain of ±1 from VIN to

VOUT, and produce rail-to-rail outputs.

4.9.2

LOSSY NON-INVERTING

INTEGRATOR

The non-inverting integrator shown in Figure 4-9 is

easy to build. It saves one op amp over the typical

Miller integrator plus inverting amplifier configuration.

The phase accuracy of this integrator depends on the

matching of the input and feedback resistor-capacitor

time constants. RF makes this a lossy integrator (it has

finite gain at DC), and makes this integrator stable by

itself.

FIGURE 4-9:

Non-Inverting Integrator.

–

VIN

VOUT

VREF

Op Amp A

Op Amp B

VREF

time

Input

Output

R2R4

2R3

------------

1/2

MCP6272

1/2

MCP6272

R4 R3

VD1

VREF VSS

–

----------------------------

–

⎝⎠

⎛⎞

VIN

VOUT

VIN

-------------

sR1C1

()

--------------------

πR

1C1 1

RF R2

⁄

()

---------------------------------------------------

≈

MCP6271

RF R2

≈

R1C1

R2||RF

()C

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