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How to use chip resistors smartly
- 1.Basic knowledge of resistors
- 2.Manufacturing methods and characteristics of thin film resistors
- 3.Performance characteristics of thin film resistors
- 4.High precision and high reliability
- 5.Trimmable chip resistors and altering resistive values
- 6.Application and recommended usage of thin film chip resistors
- 7.Application and recommended usage of small high power thin film ship resistors
- 8.Various methods of current sensing and advantage of current sensing resistors
- 9.Application and recommended usage of current sensing resistors
- Smart usage of High Frequency Chip Components
- Application Information
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Product Technical Report
Standard Specification for surface mount chip resistors
- Recommended land patterns
- Recommended reflow and flow soldering profile
- Dimensions of the packaging reel
- Dimensions of the packaging tape
Standard Specification for High frequency surface mount components
- Recommended reflow soldering profile
- Dimensions of the packaging tape
- Dimensions of the packaging reel
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- Technical Information
- 1 Most common high frequency chip: Chip Attenuator
1 Most common high frequency chip: Chip Attenuator
1.1 Functions and usage of various attenuators
Various attenuators
・There are many kinds of attenuators
・Chip attenuators are integrated into coaxial or module type attenuators.
The function of an attenuator
Attenuators weaken (attenuate) the electrical signals to the desired level. The amount of attenuation is expressed in decibel (dB). Attenuation is typically negative value but usually omit minus ”-” when it is expressed.
Example of attenuation
How attenuators are used
Attenuators can weaken (attenuate) the electrical signals to desired level. Here are some examples:
1)Level adjusting attenuator
2)Impedance matching (as a safety device)
3)Other
Used in measurement taking advantage of wide band and linearity.
1.2 Attenuator circuit and integration into 1 chip
Attenuator circuit
Attenuators can be constructed using discrete resistors forming T, π, or double π shapes. In communication, the impedance must match 50Ω.
Examples of resistance combination for specific attenuation values
According to the attenuation value and the type of the circuit, the combination of resistance varies significantly. The table right shows the examples of π circuit resistance combination. These combinations also give 50Ω impedance matching.
ATT(dB) | R1,R3(Ω) | R2(Ω) |
---|---|---|
1 | 869.5 | 5.8 |
2 | 436.2 | 11.6 |
3 | 292.4 | 17.6 |
4 | 221 | 23.8 |
5 | 178.5 | 30.4 |
6 | 150.5 | 37.4 |
7 | 130.7 | 44.8 |
8 | 116.1 | 52.8 |
9 | 105 | 61.6 |
10 | 96.2 | 71.2 |
Chip attenuator is an integration of 3 resistors
If you use discrete resistors to form an attenuator, you need 3 resistors. One chip attenuator can function as 3 discrete resistors and has the following advantages
・Guaranteed performance with one component
・Signal and ground terminals in one component simplify the PC board layout.
・Minimize parasitic capacitance and inductance
Technical Information
-
- 1.Basic knowledge of resistors
- 2.Manufacturing methods and characteristics of thin film resistors
- 3.Performance characteristics of thin film resistors
- 4.High precision and high reliability
- 5.Trimmable chip resistors and altering resistive values
- 6.Application and recommended usage of thin film chip resistors
- 7.Application and recommended usage of small high power thin film ship resistors
- 8.Various methods of current sensing and advantage of current sensing resistors
- 9.Application and recommended usage of current sensing resistors
-
-
Standard Specification for surface mount chip resistors
- Recommended land patterns (soldering footprints)
- Recommended reflow and flow soldering profile
- Dimensions of the packaging reel
- Dimensions of the packaging tape
-
Standard Specification for surface mount chip resistors
-
- High Precision Thin Film Chip Resistors Current sensing chip resistors
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Activity Contents
Technical Information
How to use chip resistors smartly
- 1.Basic knowledge of resistors
- 2.Manufacturing methods and characteristics of thin film resistors
- 3.Performance characteristics of thin film resistors
- 4.High precision and high reliability
- 5.Trimmable chip resistors and altering resistive values
- 6.Application and recommended usage of thin film chip resistors
- 7.Application and recommended usage of small high power thin film ship resistors
Standard Specification for surface mount chip resistors
- Recommended land patterns
- Recommended reflow and flow soldering profile
- Dimensions of the packaging reel
- Dimensions of the packaging tape
Standard Specification for High frequency surface mount components
Smart usage of High Frequency Chip Components
Susumu Co., Ltd. a Specialist in Thin Film Technology