AD605 Просмотр технического описания (PDF) - Analog Devices

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AD605

Dual, Low Noise, Single-Supply Variable Gain Amplifier

Analog Devices 

Figure 40 shows the gain vs. VGN for the circuit in Figure 39

at 1 MHz and the lowest gain range (−14 dB to +34.4 dB). Note

that the gain scaling is 40 dB/V, double the 20 dB/V of an

individual DSX; this is the result of the parallel connection of

the gain control inputs, VGN1 and VGN2. The gain can also be

sequentially increased by first increasing the gain of Channel 1

and then Channel 2. In this case, VGN1 and VGN2 are driven

from separate voltage sources, for instance two separate DACs.

Figure 41 shows the gain error of Figure 39.

80

70 f = 1MHz

THEORETICAL

60

50

ACTUAL

40

30

20

10

0

–10

–20

–30

–40

0.1

0.5

0.9

1.3

1.7

2.1

2.5

2.9

VGN (V)

Figure 40. Gain vs. VGN for the Circuit in Figure 39

AD605

4

f = 1MHz

3

2

1

0

–1

–2

–3

–4

0.2

0.7

1.2

1.7

2.2

2.7

VGN (V)

Figure 41. Gain Error vs. VGN for the Circuit in Figure 39

Rev. F | Page 17 of 24

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