Thick film hybrid integrated circuits are an indispensable part of modern electronic technology, widely used in fields such as communication, aerospace, and automotive electronics. In thick film hybrid integrated circuits,
Silver palladium pasteAs an important conductive material, it is widely used in the preparation of components such as resistors, capacitors, inductors, and the interconnection of circuits. However, the application of silver palladium paste in filter circuits faces many challenges and difficulties. This article will combine the research results of Advanced Institute (Shenzhen) Technology Co., Ltd. to explore the application difficulties of silver palladium paste in filter circuits and propose corresponding solutions.
1、 Characteristics and advantages of silver palladium slurry
Silver palladium slurry is a composite material mainly composed of silver (Ag) and palladium (Pd) powders and organic carriers. Silver has excellent conductivity and oxidation resistance, while palladium endows the slurry with higher oxidation resistance and sulfur resistance. This combination enables silver palladium paste to maintain stable performance in harsh environments such as high temperature and high humidity, making it particularly suitable for use in thick film hybrid integrated circuits. In addition, silver palladium paste also has good printing and sintering properties, which can meet the manufacturing process requirements of thick film circuits.
2、 Special requirements for silver palladium paste in filter circuits
A filter circuit is a type of circuit used for signal processing, whose main function is to allow signals within a specific frequency range to pass through while suppressing signals at other frequencies. In thick film hybrid integrated circuits, filter circuits are typically composed of components such as inductors, capacitors, and resistors. The performance of these components directly affects the frequency response, insertion loss, and stability of the filter. Therefore,
Silver palladium pasteThe application in filter circuits requires the following special requirements to be met:
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High precision resistance value: The resistance elements in the filter circuit need to be precisely controlled to ensure that the frequency response of the filter meets the design requirements. The resistivity of silver palladium paste needs to be adjustable within a certain range, and the resistance value after sintering should have high accuracy and stability.
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Good high-frequency performance: Filter circuits typically operate in the high-frequency range, and silver palladium paste needs to have low dielectric loss and low skin effect to reduce signal loss and distortion during transmission.
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High reliability: The filter circuit may be applied in harsh environments such as high temperature and high humidity. Silver palladium paste needs to have good oxidation resistance and sulfur resistance to ensure the long-term stability of the circuit.
3、 The application difficulties of silver palladium paste in filter circuits
（1） Accurate control of resistance value
In filter circuits, the resistance value of the resistive element needs to be precisely controlled within the design range. However, the resistivity of silver palladium slurry is influenced by various factors, such as the silver palladium ratio, sintering temperature, sintering time, etc. In actual production, small changes in these parameters may lead to significant deviations in resistance values. For example, high or low sintering temperatures can affect the sintering degree of silver palladium particles, thereby changing their electrical resistivity. In addition, the silver palladium slurry may experience particle agglomeration during the sintering process, which further affects the uniformity and stability of the resistance value.
（2） Optimization of high-frequency performance
High frequency filter circuits are highly sensitive to the dielectric loss and skin effect of materials.
Silver palladium pasteAlthough it has good conductivity, its skin effect may lead to increased signal loss under high-frequency conditions. In addition, the dielectric constant and dielectric loss tangent (tan δ) of silver palladium paste also need to be strictly controlled. If these parameters are too high, it will cause reflection and attenuation of the signal during transmission, affecting the performance of the filter.
（3） Environmental adaptability and reliability
Filter circuits may be applied in various harsh environments, such as high temperature, high humidity, high vibration, etc. Silver palladium paste needs to have good oxidation resistance and sulfur resistance to prevent performance degradation in these environments. However, the silver component in the silver palladium slurry is prone to oxidation reactions in high humidity environments, leading to an increase in resistance value. In addition, a high content of palladium can increase material costs, while a low content may not meet antioxidant requirements.
4、 Summary
Silver palladium paste has broad application prospects in filter circuits of thick film hybrid integrated circuits, but its application also faces many challenges. By optimizing the formula, improving the process, and adopting advanced surface modification technology,
Advanced Institute (Shenzhen) Technology Co., LtdSuccessfully solved the difficulties in precise control of resistance value, optimization of high-frequency performance, and environmental adaptability of silver palladium slurry. These research results not only improve the performance and reliability of filter circuits, but also provide strong technical support for the development of thick film hybrid integrated circuits.
The above data is for reference only, and specific performance may vary due to production processes and product specifications.
