Data Sheet

ADPA1107

Rev. 0 | Page 17 of 20

APPLICATIONS INFORMATION

BASIC CONNECTIONS

The basic connections for operating the ADPA1107 are shown

in Figure 51. Apply a power supply voltage of between 28 V and

32 V on all VDDxA and VDDxB pins. Decouple the VDDxA

and VDDxB pins with the capacitor values shown in Figure 51.

The VDD1x pins require a 2.55 Ω resistor in series with the

decoupling capacitor to assist with making the ADPA1107

stages. The decoupling capacitors on the VDDxA, VDDxB, and

VGG1 lines represent the configuration that was used to

characterize and qualify the ADPA1107.

Pin 1 through Pin 4, Pin 8 through Pin 12, Pin 14 through

Pin 17, Pin 20 through Pin 22, Pin 28 through Pin 31, Pin 34

through Pin 37, and Pin 40 are designated as no internal

connection (NIC) pins. Although the NIC pins are not

internally connected, the NIC pins were all connected to

ground during the characterization of the device.

Apply a voltage between −2 V and −4 V to the VGG1 line to set

the drain current. The device can be operated by pulsing either

the gate voltage or the drain voltage.

In gate pulsed mode, VDDxA and VDDxB are held at a fixed

level (nominally +28 V), while the gate voltage is pulsed between

−4 V (off) and approximately −2.6 V (on). The exact on level

In drain pulsed mode, VDDxA and VDDxB are pulsed on and

off while the gate voltage is held at a fixed negative level

between −2 V and −4 V. Because high currents and voltages are

being switched on and off, a metal-oxide semiconductor field

effect transistor (MOSFET) and a MOSFET switch driver are

required in the circuit. Large capacitors are also required, which

act as local reservoirs of charge and help provide the drain

current required by the ADPA1107 while maintaining a steady

drain voltage during the on time of the pulse.

The ADPA1107-EVALZ includes a plug-in pulser board that

contains the required circuitry to implement drain pulsed

mode. See the ADPA1107A-EVALZ user guide (UG-1962)

for additional information.

To safely turn power on, the VGG1 voltage must be set to −4 V

before the VDDxA and the VDDxB voltages are applied. After

be applied.

To safely turn power off, remove the RF input signal and decrease

VGG1 to −4 V. VDDxA and VDDxB can then be decreased to 0

V before increasing VGG1 to 0 V.