REV. 0

AD8367

–15–

Table III. Suggested Component Values For External AGC

Detector Circuit

Rate

C1

C2

R2

R3

Modulation Type

Sym/s

F

Fk

k

QPSK

1.23 M

0.0022

0.033

150

62

QPSK

4 M

0.0022

0.015

150

39

π/4 DQPSK

24.3 K

0.033

0.68

150

51

64 QAM

100 K

0.015

1.5

150

51

64 QAM

500 K

0.0068

0.33

150

62

64 QAM

4 M

0.0022

0.068

150

100

Evaluation Board

Figure 16 shows the schematic of the AD8367 evaluation board.

The board is powered by a single supply of 2.7 V to 5.5 V. Table

IV details the various configuration options of the evaluation board.

Figure 17. Layout of Component Side

14

13

12

11

10

9

8

1

2

3

4

5

6

7

ENBL

INPT

MODE

GAIN

DETO

ICOM

ICOM

HPFL

VPSI

VPSO

VOUT

DECL

OCOM

ICOM

AD8367

OUTPUT

C5

10nF

R4

174

R5

4.7

R6

4.7

C1

1 F

C2

0.1 F

C3

0.1 F

0.1 F

TP1

C4

0.1 F

J2

R3

57.6

R7

10k

TP4

GAIN

SW1

SW2

R2

174

J1

INPUT

R1

57.6

LK1

TP3

MODE

Figure 16. Evaluation Board Schematic

Figure 18. Silkscreen of Component Side

Characterization Setup and Methods

Minimum-loss L-pad matching networks were used to interface

standard 50

Ω test equipment to the 200 Ω input impedance during

the characterization process. Using a 57.6

Ω shunt resistor followed

by a 174

Ω series resistor provides a broadband match between the

50

Ω test equipment and the 200 Ω device impedance as illustrated

in Figure 19. The insertion loss of this network is 11.5 dB.

AD8367

174

174

57.6

57.6

Figure 19. Characterization Test Setup