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Thermal Variable Attenuator
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Thermal Variable Attenuator
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Easy control of gain change generated by temperature change of high frequency amplified circuit |
| YDS's Thermal Variable Attenuator is an element, the attenuation of which changes following the change of environmental temperature. If you use this Thermal Variable Attenuator, attenuation decreases as temperature rises, so it can correct characteristics, which lose gain with a temperature rise on the high frequency amplified circuit. With only one Thermal Variable Attenuator, you can directly control input signals with analog continuity and it is the simplest and the most reasonably priced method for adjusting the characteristics influenced by the change of environmental temperature. We can serve not only the improvement of circuit performance but far-reaching merits; cost saving and simplification of material control. We have good results in correcting temperature influences of circuits used in various telecommunication amplifiers for such the base station of cellular phones by using this Thermal Variable Attenuator. |
| Features |
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• ・Fine reproducibility enables attenuation to change to the certain
values following the change of ambient temperatures.
• ・Analog correcting enables smooth continuous correction by a single
step. • ・Due to its simple design, little phase changes and time delay
change by temperature changes • ・Available in a wide range from low to high frequency by consisting
of passive resistor materials • ・Miniature size(2.0X1.25mm), light(about 6.5mg) and less area
in a circuit • ・Easy automatic mounting because of the surface-mount type provided
(taped to a post) • ・High reliability by simple design and few junctions • ・Temperature correction at a more reasonable price than in other
styles • ・Using high precision thin film and a special thermostatic resistor,
it makes no attenuation change by effects except temperature, and
guarantees steady operation. • ・Serves a total of 80 temperature correction characteristics. (Each of 10
attenuations has 8 variation slope characteristics.) |
Mechanical
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Schematic Diagram
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RS,RL,RR : Thin Film Resistor
TR : Thermistor (NTC) (1)and(2) : In Out terminal (3) : Ground terminal |
Specification
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Item |
Specification |
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Attenuation and Tolerance |
1,2,3,4,5,6,7,8,9,10dB ï½±0.5dB |
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Impedance |
50 ohm |
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V S W R |
Less than 1.3 |
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Frequency Range |
DC ～ 3GHz |
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Power Rating |
63mW |
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Operating Temperature Range |
-40 ～ +100 ℃ |
| Temperature Characteristics | please see data page |
Type Designation (How to order)
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PXV1220S - **dB - N* - T 1 2 3 4 |
1 type 2 attenuation 3 temperature curve 4 packaging type (T : taping) |
Application Please see application page
