AD605BRZ-RL7 Ver la hoja de datos (PDF) - Analog Devices

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Fabricante

AD605BRZ-RL7

Dual/ Low Noise/ Wideband Variable Gain Amplifiers

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. One could of course

also sequentially increase the gain 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. D | Page 17 of 20

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