Datasheet

Using the THS4062 EVM In The Inverting Mode
1-10
General
1.6 Using the THS4062 EVM In The Inverting Mode
The THS4062 EVM operates from power-supply voltages ranging from ±5 V
to ±15 V. As shipped, the EVM is configured for noninverting operation. Move
the resistors as detailed above to configure the EVM for inverting operation,
which sets the gain to –3. Signal inputs on the module are terminated for 50-Ω
nominal source impedance. An oscilloscope is typically used to view and
analyze the EVM output signal.
1) Ensure that all power supplies are set to OFF before making power supply
connections to the THS4062 EVM.
2) Connect the power supply ground to the module terminal block (J2)
location marked
GND .
3) Select the operating voltage for the EVM and connect appropriate split
power supplies to the module terminal block (J2) locations marked
–VCC
and +VCC .
4) Connect an oscilloscope to the module SMA output connector
(J3/J5)
through a 50-Ω nominal impedance cable (an oscilloscope having a 50-Ω
input termination is preferred for examining very high frequency signals).
5) Set the power supply to
ON .
6) Connect the signal input to the module SMA input connector (J1/J2) .
Each EVM input connector is terminated with an equivalent 50-Ω impedance
to ground. With a 50-Ω source impedance, the voltage seen by the THS4062
amplifier IC on the module will be the source signal voltage applied to the
EVM. This is due to the voltage division between the source impedance and
the EVM input terminating resistors (R1||R4 and R9||R12).
7) Verify the output signal on the oscilloscope.
The signal shown on an oscilloscope with a 50-Ω input impedance will be
the actual THS4062 amplifier IC output voltage. This is due to the voltage
division between the output resistor (R7, R15) and the oscilloscope input
impedance.