Hyperabrupt Varactor-Tuned
Oscillators
Technical Data
VTO-9000 Series
Pin Configuration
Features
This provides extremely fast
• 25 MHz to 2.3 GHz Coverage tuning speed limited primarily by
TO-8V
GROUND
the internal impedance of the
user-supplied voltage driver.
• Fast Tuning
3
1
+V
TUNE
• Fast Setting Time
RF OUT
2
4
• +20 VDC Max Tuning
Voltage
This family of oscillators is
similar to the standard commer-
cial VTO-8000 Series except for
the incorporation of a silicon
hyperabrupt varactor tuning
diode. This enables the oscillator
to be tuned over the specified
range in less than 20 volts rather
than 40 to 50 volts in conven-
tional oscillators.
• 10 mW Output Power
+DC
VOLTAGE
CASE GROUND
• ± 2.0 dB Output Flatness
• Hermetic Thin-film
Construction
lightweight commercial and
military equipment designs.
Test fixturing is also available for
lab bench test applications. See
the “Test Fixtures for TO-8
Packages” section for additional
information and outlines.
Description
HPVTO-9000HyperabruptSeries
oscillators use a silicon transistor
chip as a negative resistance
oscillator. The oscillation fre-
quency is determined by a silicon
hyperabrupt varactor diode acting
as a voltage-variable capacitor in a
thin-film microstripline resonator.
The VTO-9000 Series VTOs are
packaged in TO-8 transistor cans
for simple installation in a
conventional 50-ohm
microstripline PC board. They
are ideal for most compact
Applications
The VTO-9000 Series oscillators
may be used in the same applica-
tions as VTO-8000 Series oscilla-
tors. The VTO-9000 Series is the
desired choice for superior
linearity and modulation sensitiv-
ity requirements.
Schematic
+15 V
Output Matching
RF Output
Series Feedback
Varactor
V Tune
Tuning
Port
Resonator
Capacitor
9-30
5964-9814E