Data Sheet

ADL8141

THEORY OF OPERATION

analog.com

Rev. 0 | 18 of 22

The ADL8141 is a GaAs, MMIC, pHEMT, low noise wideband am-

plifier with an integrated bias inductor and AC-coupling capacitors.

A simplified schematic is shown in Figure 71.

To set the drain bias current, connect an external resistor between

the RBIAS and VDD pins.

The ADL8141 has AC-coupled, single-ended input and output ports

with impedances that are nominally equal to 50 Ω over the 14 GHz

to 24 GHz frequency range. No external matching components are

required. While the RF output path is AC-coupled, there is a DC

path to ground on the RFOUT side of the AC-coupling capacitor.

Figure 71. Simplified Schematic