The Model GA-21R Wide Band Amplifier is designed to operate with transverse field
modulators, such as Lasermetrics’ EOM- 3079 Series. The amplifier is capable of
driving the capacitive load presented by these modulators. It can produce output
voltages that, depending on the wavelength of operation and the modulator aperture
diameter, can provide full modulation depth of the laser beam.
The GA-21R utilizes two Class A output amplifiers driven differentially from a
common, single ended input. The Direct amplifier output is in phase with the signal
input and the Inverted amplifier output is 180o out of phase. A manually adjustable
bias voltage from 0 to ±140 volts (approx.) is available for shifting the modulator
operating point along its characteristic transmission curve.
The outputs may be used independently (single ended) or differentially (double ended)
when connected to a modulator. In the differential mode the voltage seen by the
modulator is twice that of a single channel.
High frequency response of the GA-21R is a function of the load capacitance which includes the modulator
and interconnecting coaxial cables.
Driving a resistive or tuned load is permissible if DC voltage blocking capacitors are used between the
outputs and the load, and proportionally lower output voltages are acceptable.
RoHS
MODEL GA-21R WIDE BAND AMPLIFIER DADA SHEET (PDF)
