9-23
Varactor-Tuned Oscillators
Technical Data
VTO-8000 Series
Pin Configuration
TO-8V
Features
600 MHz to 10.5 GHz
Coverage
Fast Tuning
+7 to +13 dBm Output
Power
1.5 dB Output Flatness
Hermetic Thin-film
Construction
GROUND
CASE GROUND
+DC
VOLTAGE
RF
+V
3
1
2
4
OUT
TUNE
Description
HP VTO-8000 Series oscillators
use a silicon transistor chip as a
negative resistance oscillator. The
oscillation frequency is deter-
mined by a silicon abrupt varactor
diode acting as a voltage-variable
capacitor in a thin-film micro-
stripline resonator. This provides
extremely fast tuning speed,
limited primarily by the internal
impedance of the user-supplied
voltage driver. Fast settling is
another feature of the HP
VTO-8000 Series oscillators.
Typical settling times for the
VTO-8090 are <200 kHz within one
microsecond while the VTO-8950
settles to <2 MHz within two
microseconds referenced to ten
milliseconds. The VTO-8850
combines a bipolar transistor
oscillator with a GaAs FET buffer
stage. This GaAs FET buffer
isolates the oscillator from
variations in load impedance for
low frequency pulling, allows the
oscillator to run lighty-loaded for
low phase noise content and
provides +10 dBm of minimum
output power over the full tuning
range. The VTO-8000 Series
varactor-tuned oscillators are
packaged in TO-8 transistor cans
for simple installation in a
conventional 50-ohm micro-
stripline PC board. They are ideal
for most compact, lightweight
commercial and military equip-
ment 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.
Applications
Frequency agile systems, such as
digitally controlled receivers and
active jamming transmitters often
use externally linearized
varactor-tuned oscillators. HP
oscillators are monotonic making
external linearization easy using
analog (opamp) or digital
(EPROM) linearizing techniques.
The HP VTO Series has been
designed with a tuning input
bypass capacitance which is
sufficient to provide the neces-
sary RF filtering action yet as low
as possible to maximize
V/
T
characteristics for excellent
tuning speeds. Used in a phase
locked loop PLL circuit, a VTO
provides a receiver LO with
stability equivalent to the refer-
ence oscillator (usually crystal
controlled), yet variable in
discrete steps or continuously
depending on the PLL
configuration.
Another important aspect of VTOs
used in an LO application is their
power vs. frequency flatness
(
1.5 dB). This assures that once a
receiver mixer is biased for best
dynamic range the local oscillator
drive will remain constant
throughout the tuning range
without complex leveling
circuitry.
5964-9815E
9-24
Part Number
VTO8060
VTO8080
VTO8090
VTO8150
VTO8200
Frequency Range, Min.
6001000 MHz
8001400 MHz
9001600 MHz
15002500 MHz
20003000 MHz
Power Output into 50ohm Load,Min.
20 mW/+13 dBm
20 mW/+13 dBm
20 mW/+13 dBm
10 mW/+10 dBm 10 mW/+10 dBm
Power Output Variation @ 25
C, Max.
1.5 dB
1.5 dB
1.5 dB
1.5 dB
1.5 dB
Operating Case Temperature Range
0
to +65
C
0
to +65
C
0
to +65
C
0
to +65
C
0
to +65
C
Frequency Drift Over Operating
8 MHz
10 MHz
10 MHz
18 MHz
30 MHz
Temperature, Typ.
Pulling Figure (12 dB Return Loss), Typ.
25 MHz
25 MHz
25 MHz
35 MHz
35 MHz
Pushing Figure, +15 VDC Supply, Typ.
5 MHz/V
6 MHz/V
6 MHz/V
6 MHz/V
6 MHz/V
Harmonics, Below Carrier, Typ.
15 dB
15 dB
15 dB
15 dB
18 dB
Spurious Output Below Carrier, Min.
60 dB
60 dB
60 dB
60 dB
60 dB
Tuning Voltage
Low Frequency
3
1 VDC
2
1.5 VDC
2
1 VDC
2.5
1 VDC
2+2/1 VDC
High Frequency
40
8 VDC
35
10 VDC
48+8/10 VDC
47
8 VDC
20
4 VDC
Maximum Tuning Voltage
+60 VDC
+60 VDC
+60 VDC
+60 VDC
+45 VDC
Tuning Port Capacitance, Nom.
180 pF
180 pF
180 pF
90 pF
45 pF
Phase Noise, Singie Sideband,
1 Hz Bandwidth, Typ.
50 kHz From Carrier
110 dBc/Hz
100 dBc/Hz
100 dBc/Hz
95 dBc/Hz
95 dBc/Hz
100 kHz From Carrier
117 dBc/Hz
107 dBc/Hz
107 dBc/Hz
102 dBc/Hz
102 dBc/Hz
Input Power
1% Regulation
Voltage, Nom.
+15 VDC
+15 VDC
+15 VDC
+15 VDC
+15 VDC
Current, Max.
50 mA
50 mA
50 mA
50 mA
50 mA
Case Style
TO8V
TO8V
TO8V
TO8V
TO8V
Part Number
VTO8240
VTO-8360
VTO8430
VTO8580
Frequency Range, Min.
24003700 MHz
36004300 MHz
43005800 MHz
58006600 MHz
Power Output Into 50ohm Load, Min.
10 mW/+10 dBm
10 mW/+10 dBm
10 mW/+10 dBm
5 mW/+7 dBm
Power Output Variation @25
C., Max.
1.5 dB
1.5 dB
1.5 dB
1.5 dB
Operating Case Temperature Range
0
to +65
C
0
to +65
C
0
to +65
C
0
to +65
C
Frequency Drift Over Operating
30 MHz
35 MHz
60 MHz
70 MHz
Temperature, Typ.
Pulling Figure (12 dB Return Loss), Typ.
35 MHz
40 MHz
50 MHZ
70 MHz
Pushing Figure, +15 VDC Supply, Typ.
6 MHz/V
6 MHz/V
6 MHz/V
8 MHz/V
Harmonics, Below Carrier, Typ.
18 dB
25 dB
25 dB
25 dB
Spurious Output Below Carrier, Min.
60 dB
60 dB
60 dB
60 dB
Tuning Voltage
Low Frequency
2+2/1 VDC
8
2 VDC
1.0 VDC Min
5
2.5 VDC
High Frequency
30
8 VDC
24
4 VDC
20.0 VDC Max.
24+3/5 VDC
Maximum Tuning Voltage
+45 VDC
+30 VDC
+30 VDC
+30 VDC
Tuning Port Capacitance, Nom.
45 pF
45 pF
45 pF
45 pF
Phase Noise, Single Sideband,
1 Hz Bandwidth, Typ.
50 kHz From Carrier
95 dBc/Hz
100 dBc/Hz
90 dBc/Hz
85 dBc/Hz
100 kHz From Carrier
102 dBc/Hz
108 dBc/Hz
97 dBc/Hz
92 dBc/Hz
Input Power
1% Regulation
Voltage, Nom.
+15 VDC
+15 VDC
+15 VDC
+15 VDC
Current, Max.
50 mA
50 mA
50 mA
50 mA
Case Style
TO8V
TO8V
TO8V
TO8V
Electrical and Performance Specifications
Guaranteed Specifications @ 25
C Case Temperature (0
to +65
C Operating Temperature)
9-25
Electrical and Performance Specifications
Guaranteed Specifications @ 25
C Case Temperature (0
to +65
C Operating Temperature)
Part Number
VTO8650
VTO8810
VTO8850
VTO8950
Frequency Range, Min.
6500-8600 MHz
81009100 MHz
85009600 MHz
950010500 MHz
Power Output Into 50ohm load, Min.
10 mW/+10 dBm
10 mW/+10 dBm
10 mW/+10 dBm
10 mW/+10 dBm
Power Output Variation @ 25
C., Max.
1.5 dB
1.5 dB
1.5 dB
1.5 dB
Operating Case Temperature Range
0
to +65
C
0
to +65
C
0
to +65
C
0
to +65
C
Frequency Drift Over Operating
100 MHz
110 MHz
110 MHz
160 MHz
Temperature, Typ.
Pulling Figure (12 dB Return Loss), Typ.
15 MHz
8 MHz
10 MHz
20 MHz
Pushing Figure, +15 VDC Supply, Typ.
10 MHz/V
12 MHz/V
15 MHz/V
10 MHz/V
Harmonics, Below Carrier, Typ.
20 dB
15 dB
25 dB
20 dB
Spurious Output Below Carrier, Min.
60 dB
60 dB
60 dB
60 dB
Tuning Voltage
Low Frequency
2
1 VDC
2 VDC Min.
5
2 VDC
4
1 VDC
High Frequency
20
5 VDC
16 VDC Max.
13
5 VDC
10 VDC Max.
Maximum Tuning Voltage
30 VDC
+30 VDC
+30 VDC
+15 VDC
Tuning Port Capacitance, Nom.
26 pF
26 pF
26 pF
26 pF
Phase Noise, Single Sideband,
1 Hz Bandwldth, Typ.
50 kHz From Carrier
80 dBc/Hz
80 dBc/Hz
82 dBc/Hz
73 dBc/Hz
100 kHz From Carrier
88 dBc/Hz
88 dBc/Hz
90 dBc/Hz
80 dBc/Hz
Input Power
1% Regulation
Voltage, Nom.
+15 VDC
+15 VDC
+15 VDC
+15 VDC
Current, Max.
50 mA
100 mA
100 mA
100 mA
Case Style
TO8V
TO8V
TO8V
TO8V
Schematic
RF Output
Output Matching
+15 V
Resonator
Series Feedback
Tuning
Port
Capacitor
V Tune
Varactor
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