User guide

6
Internal modulation source
• Low distortion sinewaves to 400 kHz
with variable phase and amplitude.
• Triangle, sawtooth and squarewaves to
50 kHz with variable phase and amplitude.
• White Gaussian noise with variable
amplitude.
• Two independent sources for two-tone
testing.
Optional pulse modulation
(Option 008, 8664A and
8665A/B)
• An Agilent designed GaAs pulse
modulator provides the exceptional
performance that is so critical for pulsed
applications.
• <5 ns rise/fall times, >80 dB on/off
ratio.
• Built-in pulse generator features
include variable pulse delay and width
from 50 ns to 999 ms. This saves
purchasing additional equipment.
• Leveled RF output maintains accuracy
while in pulse modulation.
High reliability electronic
attenuator on the 8643A
(optional on 8644B)
For applications up to 1 GHz, the electronic
attenuator used in the 8643A provides
increased reliability. Instead of using
mechanical relays, the electronic attenuator
uses solid-state components for setting
output levels accurate to within ±1.0 dB.
The Agilent patented design uses PIN
switching elements with three million
hours of MTBF, giving the attenuator an
estimated 0.2% failure rate.
Features that improve the usability of Agilent’s 8643A, 8644B, 8664A
and 8665A/B for your application!