Thin Film Technology
Corporation
p
North Mankato, Minnesota
(507) 625-8445
Temperature Variable Attenuator
Ch
Characteristics
t i ti
• Attenuation varies with temperature
• Reduces
R d
ttemperature
t
effect
ff t off amplifier
lifi circuits
i it
• Provides flat gain response of amplifier circuits
• Excellent return loss up to 10
10.0
0 GHz frequency
• Small component size
Advantage
• Replace temperature compensation and Automatic Gain Control
(AGC) components from the amplifier circuit
• Simplifies the circuit and reduces components in the circuit board
• Saves cost in material, design and labor
• Faster response than traditional circuits
Temperature Variable Attenuator
Application
• In high frequency applications, amplifiers have a tendency to decrease
their gain as the temperature rises.
rises
• Temperature variable attenuators provide the opposite temperature
characteristics of the amplifier. Its attenuation decreases as the
t
temperature
t
rises.
i
• The amplifier’s loss due to higher temperatures can be compensated by
placing a temperature variable attenuator in series with the amplifier.
• This combination circuit cancels out the temperature dependency of the
components and results in a constant output over temperature.
• Si
Since temperature variable
i bl attenuators are a passive
i component, they
h
does not require any outside power.
• Temperature
p
variable attenuators adapts
p to the ambient temperature
p
and
automatically changes their attenuation.
Temperature Variable Attenuator
Notes
• The blue line represents the amplifier’s output gain, which is reduced as the temperature increases.
• The green line represents the temperature variable attenuator’s output, which reduces attenuation as
the temperature increases
• The
Th pink
i k line
li represents
t the
th resultant
lt t output
t t off the
th circuit,
i it which
hi h shows
h
fl t response.
flat
• As the temperature rises, the attenuation reduction of the temperature variable attenuator compensates
for the gain reduction of the amplifier circuit, resulting in a stable output.
Temperature Variable Attenuator
Advantage
• Circuit simplification
• Reduces the number of components, reduces the circuit complexity
• Reduces component and labor costs
Temperature Variable Attenuator
F t
Features
• High repeatability: Amount of attenuation change by the temperature is very consistent
• Analog correcting : No steps, single continuous correction
• No temperature effect on phase: No or little temperature related change in phase or time
delay
• Wide functional frequency range: From low (DC) to high frequency (GHz) range
• Small size: As small as English 0805 size with weight of about 6.5mg. Smaller size saves
circuit board space
• High reliability: Due to simple design, low number of components and fewer solder
joints
• Economical: Cost effective temperature compensation compared to other methods
• Guaranteed high stability : Using precision thin film and a special thermostatic resistor
makes the attenuation only to be influenced by the temperature
• More than eighty temperature correction characteristics : We offer 10 attenuation
characteristics with 8 or 9 temperature compensation slopes each
Temperature Variable Attenuator
Electrical Specification for 0805 size, 3GHz Series (ATV0805C Series)
Type
ATV0805C
English Size
0805
Metric Size
2012
Attenuation (at 25°C)
Attenuation Tolerance (at 25°C)
Impedance
VSWR
Temperature Characteristic
Frequency Range
Power Rating
Operating Temperature Range
Rated Ambient Temperature
Packaging
1, 2, 3, 4, 5, 6, 7, 8, 9, 10dB
±0.5dB
50Ω
Less than 1.3 (Refer to VSWR temperature table)
Each attenuation has either 8 or 9 available temperature characteristics, N1 ~ N9.
temperature characteristic graphs)
DC to 3 GHz
63mW (refer to derating curve)
-40°C to 100°C
70°C
Tape & Reel (1,000 pcs/reel)
(Refer to
Temperature Variable Attenuator
S h
Schematic
i
Mechanical Specification
P
Power
D
Derating
i Curve
C
Temperature Variable Attenuator
Recommended Land Pattern
Temperature Variable Attenuator
Reliability Characteristics
Specification
Test
Test Method
Attenuation
Impedance
Short Time Overload
Applied voltage: 2.5X rated voltage or 2X maximum operating voltage, whichever
is less. Test duration: 5 seconds
±0.1dB
±1%
L d Lif
Load
Life
Test Temperature: 70°C
Applied
pp ed voltage:
o tage rated
ated voltage
o tage
Test period: 1000 hours with power cycling as follows:
90 min. power ON/30 min. power OFF,
±0 2dB
±0.2dB
±2%
Moisture Load Life
Test Condition: 60°C/90-95% RH
Applied voltage: rated voltage
Test period: 1000 hours with power cycling as follows:
90 min. power ON/30 min. power OFF
±0.2dB
±2%
Temperature Cycle
Repeat 5 cycles as follows:
-40°C(30 min.) / Room temp (3 min) /
+100°C(30 min.) / Room temp (3 min)
±0.1dB
±1%
Resistance to
Soldering Heat
Solder dip at 260°C for 10 seconds
±0.1dB
±1%
Vibration
Sine Wave: 10~55Hz, Amplitude 1.5mm,
Sweeping condition: 10~55Hz-10Hz/minute added amplitude time: XYZ each 2
hours
±0.1dB
±1%
Solderability
Solder dip at 245°C for 3 seconds
A new uniform coating of solder shall cover a minimum of 95%
of immersed surface.
Temperature Variable Attenuator
Measured Performance result of 1 dB Attenuator
Temperature Variable Attenuator
Typical performance results of 1, 2, 3, and 4 dB attenuator
Temperature Variable Attenuator
Typical performance results of 5, 6, 7, and 8 dB attenuator
Temperature Variable Attenuator
Typical performance results of 9 and 10 dB attenuator
Temperature Variable Attenuator
R li bilit T
Reliability
Testt D
Data
t
Temperature Variable Attenuator
Electrical Specification for 0805 size, 10GHz Series (ATV0805J Series)
Type
ATV0805J
E li h Si
English
Size
0805
Metric Size
2012
Attenuation (at 25°C)
Attenuation Tolerance (at 25°C)
Impedance
VSWR
Temperature Characteristic
Frequency Range
Power Rating
Operating Temperature Range
Rated Ambient Temperature
Packaging
1, 2, 3, 4, 5, 6dB
±0.5dB (DC to 3GHz)
±1.0dB ((3GHz to 10GHz))
50Ω
Less than 1.3 (Refer to VSWR temperature table)
Each attenuation has either 2 or 3 available temperature characteristics, N1 ~ N3. (Refer to
temperature characteristic graphs)
DC to 3 GHz
63mW (refer to derating curve)
-40°C to 100°C
70°C
Tape & Reel (1,000 pcs/reel)
Temperature Variable Attenuator
Performance results of 10 GHz series 3 dB Attenuator
ATV0805J-3DBN
ATV0805J-3DBN*
Temperature Variable Attenuator
Several Applications
A. Wireless communication system
Most base stations use open loop circuit designs with temperature variable attenuators
(ATV) due to their convenience for accurate gain control.
B. CATV Infrastructure
CATV systems do not uses micro processors so it can not make a closed loop circuit.
These
h
systems use ATV attenuators to controll the
h gain
i with
i h temperature .
C. Wide band system
This system is hard to control by micro processors therefore they use temperature
variable
i bl attenuators. ATV
A
attenuators are better
b
than
h micro
i
processors for
f the
h system
performance.
D. Satellite receiver system
Thi system uses temperature variable
This
i bl attenuators to minimize
i i i temperature dependence.
d
d
E. Other Potential high end signal controller
Temperature variable attenuators are used by many other types of systems that need
critical
i i l temperature control.
l
Temperature Variable Attenuator
Thank you!
Contact us for your temperature variable attenuation
and temperature compensation solution
requirements.
Thin Film Technology
1980 Commerce Drive
North Mankato, MN 56003
Phone: 507-625-8445
Fax: 507-625-3523
Email us at sales@thin-film.com
Visit us on the web at www.thin
www.thin--film.com