This tool computes idealized values for gain, output voltage and DC transfer characteristics of the AD8330, given the input control voltages and load resistances.

To use this tool, enter application parameters in the fields provided at left. Hit Enter or click Calculate to accept the entries and perform the calculations. The AD8330's gain is exponentially dependent on V_DBS (relative to V_CMG), linearly dependent on V_MAG (relative to V_CMG) and the differential input voltage (V_IN), and produces differential outputs, V_OPHI and V_OPLO that are symmetrical about V_CNTR, which may be also be changed, but by default is centered between the supply voltages, V_S and V_COMM. Inverting mode for V_DBS may be selected via the mode pulldown.

A sample output voltage may be calculated by entering a value in V_IN with the result shown in V_OUT. Supply limits and source (R_S) and load (R_L) impedances affect V_OUT, but do not affect the idealized gain.

A chart is shown at upper left of this tool. Two plots are available: the default plot is of ideal gain vs V_DBS, ignoring limits set by Vin, Vmag and the supply voltages. The other plot shows V_OPHI and V_OPLO vs. V_IN, taking these limits into account. Parametric variations in gain are not taken into account in this tool.

Quantities in gray-outlined boxes cannot be changed. Out-of-range and other error messages are flagged in a yellow message field at the bottom of the calculator.

Note: This tool only supports a single positive supply voltage (V_S) for input, internal and output supplies.

No special problems are known to exist with this calculator at this time.

For further troubleshooting information, please visit our Interactive Tools troubleshooting page.

AD8330 Product Page

Variable Gain Amplifiers Selection Guide