Page 1
Varactor-Tuned Oscillators
GROUND
CASE GROUND
+DC
VOLTAGE
RF
+V
3
1
24
OUT
TUNE
Technical Data
VTO-8000 Series
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
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
Pin Configuration
TO-8V
conventional 50-ohm micro-
Description
HP VTO-8000 Series oscillators
use a silicon transistor chip as a
negative resistance oscillator. The
oscillation frequency is determined by a silicon abrupt varactor
diode acting as a voltage-variable
capacitor in a thin-film microstripline 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
stripline PC board. They are ideal
for most compact, 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.
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 necessary RF filtering action yet as low
9-23
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 reference 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
Page 2
Electrical and Performance Specifications
Guaranteed Specifications @ 25°C Case Temperature (0° to +65° C Operating Temperature)
Part Number VTO–8060 VTO–8080 VTO–8090 VTO–8150 VTO–8200
Frequency Range, Min. 600–1000 MHz 800–1400 MHz 900–1600 MHz 1500–2500 MHz 2000–3000 MHz
Power Output into 50–ohm 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° C0° to +65°C0° to +65°C0° to +65°C0° 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 TO–8V TO–8V TO–8V TO–8V TO–8V
Part Number VTO–8240 VTO-8360 VTO–8430 VTO–8580
Frequency Range, Min. 2400–3700 MHz 3600–4300 MHz 4300–5800 MHz 5800–6600 MHz
Power Output Into 50–ohm 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° C0° to +65°C0° to +65°C0° 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 TO–8V TO–8V TO–8V TO–8V
9-24
Page 3
Electrical and Performance Specifications
Guaranteed Specifications @ 25°C Case Temperature (0° to +65° C Operating Temperature)
Part Number VTO–8650 VTO–8810 VTO–8850 VTO–8950
Frequency Range, Min. 6500-8600 MHz 8100–9100 MHz 8500–9600 MHz 9500–10500 MHz
Power Output Into 50–ohm 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°C0° to +65° C0° to +65°C0° 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 TO–8V TO–8V TO–8V TO–8V
Schematic
Series Feedback
V Tune
Tuning
Port
Capacitor
+15 V
RF OutputOutput Matching
Varactor
Resonator
9-25
Page 4
Typical Performance @ 25ºC Case Temperature
9-26
Page 5
9-27
Page 6
Typical Performance (Continued)
and Modulation Sensitivity vs. Tuning Voltage.
13
12
11
10
POWER
12
OUTPUT, dBm
11
POWER OUTPUT
TUNING CURVE
10
GHz
9
MODULATION
SENSITIVITY
FREQUENCY,
8
02 46 810
12 14 16
TUNING VOLTAGE, VDC
Figure 13. VTO–8950 Power Output, Frequency
TO-8V Case Drawing
.18
.017 +.002
–.001
.50
.45
DIA
DIA
.22
MIN
800
600
400
200
0
.300
TYP
–20
–40
–60
–80
–100
–120
LOG £(f), dBc/Hz
–140
–160
MODULATION
SENSITIVITY, MHz/V
Figure 14. Noise Comparison Single Sideband
Phase Noise.
.150
TYP
2
.150
TYP
V
TUNE
8650
8240
8950
1k
10k 100k 1M
FOURIER FREQUENCY, Hz
.300
TYP
3
1
GROUND
4
GROUND
+
V
RF
OUT
GLASS RING
.060 DIA TYP
(3X)
CASE
10M
9-28
APPROXIMATE WEIGHT 1.7 GRAMS
NOTES (UNLESS OTHERWISE SPECIFIED):
1. DIMENSIONS ARE SPECIFIED IN INCHES
2. TOLERANCES: xx ± .02
xxx ± .010
Page 7
Test Fixtures for
TO-8␣ Packages
(TF 801/802)
Oscillators (VTO)
Features
• DC to 11 GHz Frequency
Range
• Connectorized Tuning Port
and RF Output
• Easy to Test Package
• Repeatable Performance
Applications
• Engineering
Characterization
• Incoming Inspection
• System Prototype
• Demonstration of Device
Performance
Description
To facilitate testing and
prototyping of products in the
TO-8V package, a series of test
fixtures is available. Designated
the HP TF Series test fixtures,
they feature rugged construction
for precise, repeatable
measurements.
The TF Series test fixtures come
supplied with mounting hardware
to ensure excellent ground
contact between the oscillator
package and test fixture. This
assures excellent contact between
package pins and test fixture
connector pins for reliable testing.
The device under test is aligned
according to Figure 15, and
pushed fully down onto the
fixture. The steel mounting ring
clamp is placed over the device
under test and secured by machine screws prior to testing.
Orientation of pins can be verified
by comparison with part (c) of
Figure 15. It is recommended that
both machine screws be used to
fasten the ring clamp. Screws
should be tightened down snugly
with a jewelers type screwdriver.
For different connector options
check the table in Figure 15 to
identify the correct part numbers.
It should be noted that some
output power variation may be
seen, from unit data, at frequencies above 8 GHz. This is
due to small differences in lengths
of test fixture RF output
connector pins.
.53
VTO IN
PLACE
GROUND
.20
.55
.65
SERIES
TF-801
TF-802
RF
OUT
CONNECTOR OPTIONS
TUNING
VOLTAGE
SMA
SMA
Figure 15. TO-8 Test Fixture.
TUNING VOLTAGE
CONNECTOR
POWER INPUT
CONNECTOR
.83
.45
.15
RF
OUTPUT
SMA
TYPE N
.70
(b)(a)
.35
.35
.35
+ TUNING
VOLTAGE
PIN
+ TUNING
VOLTAGE
GROUND
.150
TYP
.45
.150
TYP
TUNING VOLTAGE
RF
OUT
(c)
.300
TYP
3
4
2
1
+DC VOLTAGE
(Bottom View)
DC
PIN
V
DC
GROUND
TAB ON PACKAGE
GROUND
CASE
GROUND
RF
OUT
9-29
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