1GHz, Low-Power, SOT23,

Current-Feedback Amplifiers with Shutdown

14

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AC Testing/Performance

AC specifications on high-speed amplifiers are usually

guaranteed without 100% production testing. Since

these high-speed devices are sensitive to external par-

asitics introduced when automatic handling equipment

is used, it is impractical to guarantee AC parameters

through volume production testing. These parasitics

are greatly reduced when using the recommended PC

board layout (like the Maxim evaluation kit).

Characterizing the part in this way more accurately rep-

resents the amplifier’s true AC performance. Some

manufacturers guarantee AC specifications without

clearly stating how this guarantee is made. The

MAX4223–MAX4228 AC specifications are derived

from worst-case design simulations combined with a

sample characterization of 100 units. The AC perfor-

mance distributions along with the worst-case simula-

tion limits are shown in Figures 5 and 6. These

distributions are repeatable provided that proper board

layout and power-supply bypassing are used (see

Layout

and Power-Supply Bypassing section).

0

10

30

20

40

50

-3dB BANDWIDTH (MHz)

100 UNITS

SIMULATION

LOWER LIMIT

Figure 5a. MAX4223 -3dB Bandwidth Distribution

0

10

30

20

40

50

±0.1dB BANDWIDTH (MHz)

100 UNITS

SIMULATION

LOWER LIMIT

Figure 5b. MAX4223 ±0.1dB Bandwidth Distribution

0

10

30

20

40

50

RISING-EDGE SLEW RATE (V/

µs)

100 UNITS

SIMULATION

LOWER LIMIT

Figure 5c. MAX4223 Rising-Edge Slew-Rate Distribution

0

10

30

20

40

50

FALLING-EDGE SLEW RATE (V/

µs)

100 UNITS

SIMULATION

LOWER LIMIT

Figure 5d. MAX4223 Falling-Edge Slew-Rate Distribution