Upstream CATV Amplifier with

On-Chip Anti-Alias Filter

6

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Typical Operating Characteristics (continued)

0

0.2

0.1

0.4

0.3

0.6

0.5

0.7

0.9

0.8

1.0

30

50

60

70

40

80

90 100 110 120

GAIN STEP IN LOW-NOISE MODE

vs. GAIN CODE

GAIN CODE

-60

-50

-40

-30

-20

-10

0

30

50

70

90

110

130

TRANSMIT NOISE vs. GAIN CODE

GAIN CODE

LOW NOISE MODE

HIGH POWER MODE

0

15

10

5

25

20

45

40

35

30

50

60

70

80

90

100

110

120

130

TRANSMIT ENABLE/DISABLE TRANSIENT

IN HIGH-POWER MODE vs. GAIN CODE

GAIN CODE

ENABLE

DISABLE

0

2

1

4

3

5

6

30

130

TRANSMIT ENABLE/DISABLE TRANSIENT

IN LOW-NOISE MODE vs. GAIN CODE

GAIN CODE

70

50

90

110

ENABLE

DISABLE

-80

-75

-70

-65

-60

-55

-50

-45

-40

535

45

55

25

15

65

2ND-ORDER HARMONIC DISTORTION

IN HIGH-POWER MODE vs. FREQUENCY

INPUT FREQUENCY (MHz)

-80

-75

-70

-65

-60

-55

-50

-45

-40

535

45

55

25

15

65

3RD-ORDER HARMONIC DISTORTION

IN HIGH-POWER MODE vs. FREQUENCY

INPUT FREQUENCY (MHz)

19.6dB

0.2dB/

div

21.6dB

1MHz

6.9MHz/div

70MHz

R = 301

Ω

C = 22pF

R = 680

Ω

C = 10pF

NO EQUALIZATION

D7 = 1

GC = 119

PASSBAND FLATNESS vs. RC