HS-1120RH datasheet(3/11 Pages) INTERSIL

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currents are uncorrelated on current feedback ampliﬁers, so

this technique is inappropriate.

-IBIAS ﬂows through RF causing an output offset error.

Likewise, any change in -IBIAS forces a corresponding

change in output voltage, providing the capability for output

offset adjustment. By nulling -IBIAS to zero, the offset error

due to this current is eliminated. In addition, an adjustment

limit greater than the -IBIAS limit allows the user to null the

contributions from other error sources, such as VIO, or +IN

source impedance. For example, the excess adjust current

of 50

µA [IBNADJ (Min) - IBSN (Max)] allows for the nulling of

an additional 26mV of output offset error (with RF = 510Ω) at

room temperature. The amount of adjustment is a function of

RF, so adjust range increases with increased RF. If allowed

by other considerations, such as bandwidth and noise, RF

can be increased to provide more adjustment range.

The recommended offset adjustment circuit is shown in

Figure 3.

FIGURE 2A. SCHEMATIC

FIGURE 2B. TOP LAYOUT

FIGURE 2C. BOTTOM LAYOUT

FIGURE 2. EVALUATION BOARD SCHEMATIC AND LAYOUT

FIGURE 3. OFFSET VOLTAGE ADJUSTMENT CIRCUIT

+5V

µF

0.1

µF

Ω

GND

-5V

0.1

µF

Ω

OUT

500

+IN

V+

GND

V-

OUT

HS-1120RH

510

10K

VOUT

V-

VIN

HS-1120RH

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