MCP6H81_12 datasheet(20/42 Pages) MICROCHIP

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MCP6H81/2/4

DS22320B-page 20

 2012 Microchip Technology Inc.

4.7.2

ACTIVE FULL-WAVE RECTIFIER

The MCP6H81/2/4 family of op amps can be used in

applications such as an active full-wave rectifier, as

shown in Figure 4-9. 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 voltage 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 with a

Gain = -1V/V. Therefore, the output voltage will always

be above the reference voltage, regardless of the input

signal. The reference voltage (VREF) is supplied by a

low-impedance source. In single-supply applications,

VREF is typically VDD/2.

FIGURE 4-9:

Active Full-Wave Rectifier.

4.7.3

TRIANGLE WAVES GENERATOR

The MCP6H81/2/4 family of op amps can be used in

function generation applications, such as triangle

waves generator, as shown in Figure 4-10.

The triangle waves generator consists of an integrator

and one comparator, connected in a positive feedback

loop. This approach is based on the simple fact that

integration of a constant voltage results in a linear

ramp. The op amp is configured as an integrator using

R1 and C1 to provide the triangular output and the

Schmitt triggers are designed with R2 and R3 to change

the state corresponding to the desired peak voltages of

the triangular wave output. The reference voltage

(VREF) is supplied by a low-impedance source. In

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

FIGURE 4-10:

Triangle Waves Generator.

–

VIN

VOUT

VREF

R/2

Op Amp A

Op Amp B

VREF

time

Input

Output

MCP6H82

VOUT

T1 T2

-Vo

1C1

[V/s]

-Vo

[V/s]

-Vo

VREF

MCP6H82

-Vo

- R

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