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UG-1674
SETUP
The connections required to use the ADPA1105-EVALZ with
the drain bias pulser board are shown in Figure 5. Before applying
any bias or signals, plug the pulser board into ADPA1105-EVALZ
so that the pulser board J2 header connector connects to the
ADPA1105-EVALZ P3 header, and the pulser board J3 header
connects to the ADPA1105-EVALZ P4 header. All external
supply voltages and control signals are applied to the pulser
board J1 header, which are listed in Table 3.
The gate control voltage applied to the J1 connector, Pin 9 to
Pin 14, passes directly through the pulser board and drives the
ADPA1105 V
pin and V
GG1
GG2
lines carry currents up to 2 A, the use of heavy gauge twister
pair wires is recommended to minimize voltage drops. To
observe the pulsed drain voltage (PULSED_VDD) that drives
the ADPA1105 V
and V
DD1
DD2
the J4 coaxial connector on the pulser board.
Connect a digital pulse generator that can generate 0 V to 5 V
pulses with a pulse width of 100 μs and a duty cycle of 10% to the
pulse pins of J1, Pin 19 and Pin 20.
To observe and measure the drain current and the ADPA1105
RF output power, use a current probe and a pulsed RF power
meter. If these methods are not available, make approximations
as described in the Making Average to Pulsed Approximations
section.
pin. Because the VDD and GND
pins, connect an oscilloscope to
OPERATION
Take the following steps to power-up (unless otherwise stated,
all signals are applied to the pulser board):
1.
Set the voltage on Pin 19 and Pin 20 of J1 (PULSE) to 0 V.
2.
Set the voltage on Pin 9 to Pin 14 of J1 (VGG1, VGG2) to
−4 V.
3.
Set the voltage on Pin 1, Pin 2, Pin 3, Pin 4, Pin 5 and Pin 6
of J1 (VDDx) to 50 V.
4.
Turn on PULSE (0 V/5 V, 100 μs, 10% duty cycle).
5.
Increase the voltage on Pin 9 to Pin 14 of J1 (VGG1,
VGG2) until the target I
6.
Apply the RF input signal to the ADPA1105-EVALZ RFIN
connector.
Take the following steps to power-down:
1.
Turn off the RF input signal.
2.
Set the voltage on Pin 9 to Pin 14 of J1 (VGG1, VGG2)
to −4 V.
3.
Turn off PULSE (set to 0 V).
4.
Set the voltage on Pin 1 to Pin 6 of J1 (VDD) to 0 V.
5.
Set the voltage on Pin 9 to Pin 14 of J1 (VGG1, VGG2) to 0 V.
Rev. 0 | Page 8 of 13
ADPA1105-EVALZ
is reached (nominally 400 mA).
DQ
User Guide
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