User manual

Product Overview
© 2006 Microchip Technology Inc. DS51614A-page 7
Figure 1-2 shows the Active Filter Demo Board Kit’s five PCBs; one V
DD
/2 Filter
Section PCB and four Active Filter Section PCB’s. It shows how these boards are
cascaded (using board connectors), and how lab equipment can be attached (via test
points) to measure the filter response.
FIGURE 1-2: Measurement Setup Block Diagram.
Figure 1-3 shows the block diagram of the V
DD
/2 Filter Section, and Figure 1-4 shows
the block diagram of the Active Filter Sections.
FIGURE 1-3: V
DD
/2 Filter Section Block Diagram.
FIGURE 1-4: Active Filter Section (4 each) Block Diagram.
Signal Generator
Power Supply
2
3
Signal Analyzer
V
DD
/2
3
2
Filter
1
st
3
Active
Filter
Section
2
nd
3
Active
Filter
Section
3
rd
3
Active
Filter
Section
4
th
3
Active
Filter
Section
3
3 3 3 3 33
Section
Signal
Power
Select
V
DD
/2 Source
V
IN
Supply
Output
GND
V
DD
/2
GND
V
DD
V
OUT
GND
V
DD
/2
GND
V
DD
GND GND
Signal
Power
Supply
Input
Supply Test Points
Single Op Amp
(buffers the internal
OutputInput
Signal Input
Tes t P o in t s
V
DD
/2 Source)
(INT or EXT)
Signal
Power
Resistor and
Capacitor
V
IN
Supply
Output
GND
V
DD
/2
GND
V
DD
V
OUT
GND
V
DD
/2
GND
V
DD
GND GND
Signal
Power
Supply
Input
Single
OutputInput
Signal Output
Te s t Po in ts
Op Amp
Sockets