Analysis of the characteristics of thick film circuits

What is a thick film circuit: a passive network is fabricated on the same substrate by thick film processes such as screen printing and sintering, and discrete semiconductor device chips or monolithic integrated circuits or micro components are assembled on it, and then packaged Hybrid integrated circuit.

　　The advantages of thick film circuits: Thick film hybrid integrated circuits are a kind of micro electronic functional components. The advantages are more flexible design, simple process, low cost, especially suitable for small batch production of multiple varieties. In terms of electrical performance, It can withstand higher voltage, higher power and higher current. The working frequency of thick film microwave integrated circuits can reach more than 4 GHz. It is suitable for various circuits, especially consumer and industrial electronic products Analog circuit used.

　　Why thick film circuits appear: resistance and conductor film thickness generally exceed 10 microns, which is a bit thicker than the circuit formed by sputtering and other processes, so it is called thick film. Its appearance is to improve this part of the circuit Stability and other performances were later produced by the development of shared circuits. Many products have part of the same circuit, and then there is a process to separate these circuits into mass production. (Guide: What is the inherent difference between electro-galvanizing and hot-dip galvanizing (hot-dip galvanizing)?)

　　Application range: With the development of technology, the application range of thick film hybrid integrated circuits is expanding day by day. It began to be mainly used in aerospace electronic equipment, satellite communication equipment, electronic computers, communication systems, automobile industry, etc., and later developed into audio equipment Microwave equipment and household appliances. Thick-film hybrid integrated circuits have penetrated into many industrial sectors. In Europe, thick-film hybrid integrated circuits have a dominant position in computers, followed by telecommunication, communications, military and aviation sectors. In Japan, thick film hybrid integrated circuits are widely used in consumer electronics. The United States is mainly used in aerospace, communications and computers, with communications accounting for the highest proportion.

　　In the color TV industry, thick film circuits are generally used as power circuits and high voltage circuits, including switching stabilized power supply circuits, video amplifier circuits, frame output circuits, voltage setting circuits, high voltage limiting circuits, sound circuits, and comb filters Circuit etc.

　　In the aviation and aerospace industries, thick film hybrid integrated circuits are used in airborne communications, radar, Fire control systems, missile guidance systems, satellites and various spacecraft communications, television, radar, remote sensing and telemetry systems have been widely used.

　　In the military industry, thick film circuits are generally used as high-stability, high-precision, small-volume module power supplies, sensor circuits, preamplifier circuits, power amplifier circuits, etc.

　　 In the automotive industry, thick film circuits are generally used as generator voltage regulators, electronic ignitors and fuel injection systems.

　　In the computer industry, thick film circuits are generally used to integrate memories, digital processing units, data converters, power circuits, thermal print heads in printing devices, etc.

　　In communication equipment, thick-film hybrid integrated voltage-controlled oscillators, module power supplies, precision networks, active filters, attenuators, line equalizers, side-tone suppressors, voice amplifiers, high-frequency and intermediate-frequency amplifiers, interfaces Impedance converter, user interface circuit, relay interface circuit, two/four wire converter, automatic gain controller, optical signal transceiver, laser generator, microwave amplifier, microwave power splitter, microwave filter, broadband microwave detector Wait.

　　 In the instrumentation, machine tool numerical control industry and other fields, the thick film multilayer step line technology has been successfully used in the decoding and driving circuit of the digital display tube, and the transparent thick film is also used in the cold cathode discharge type and liquid crystal type digital display. Electrodes of the tube.

　　 In addition, thick film technology also has the potential for sustainable development in many emerging edge disciplines that intersect with electronic technology. Related categories include: magnetics and superconducting film devices, surface acoustic wave devices, film sensitive devices ( Thermal, photosensitive, pressure-sensitive, gas-sensitive, force-sensitive), membrane solar cells, integrated optical circuits, etc.

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