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Production Process For Frequency Control Devices The principal resources of
frequency control products include Quartz Oscillators, crystals and
Filters.
Just about every machine and mobile wireless device from mobile phones to remote controlled gadgets have quartz crystals designed into them for exact timing and frequency management.
Typical Applications include:
Security cameras
Radio transmitters
Cell phones
Navigation
Sensors
Computer disk drives
Computers
Crystal Production
Crystal creation occurs in two stages, optical and electrical:
Optical
Crystal production begins with the selection of quartz crystal blanks of the correct thickness and cut orientation from a comprehensive library of quartz blanks. Subsequent processes consist of lapping, polishing and contouring operations to supply quartz blanks with precisely given sizing, shape, orientation and surface finish to ensure the accurate electrical properties of the completed items.
Electrical
The optical stages of manufacture are followed by electrical stages including etching and cleaning China PCB Prototype, vacuum deposition of gold or silver electrodes, mounting and bonding, adjustment to closing frequency, encapsulation, marking and final quality assurance inspection.
Crystal oscillator Production
Crystal oscillator units are created by using both thick film hybrid substrates and printed circuit board techniques. Depending upon the application, the oscillator crystal may be integrated as an independently sealed device or as an un-encapsulated crystal blank. With the latter circumstance, the blank is mounted directly onto the oscillator substrate and the completed assembly is modified to final frequency before hermetic sealing. Devices produced by an oscillator manufacturer normally includes regular CMOS/TTL oscillators, ECL/PECL output oscillators, Voltage Controlled Crystal Oscillators (VCXOs), Temperature Controlled Crystal Oscillators(TCXOs) flex PCB, and Oven Controlled Crystal Oscillators (OCXOs), these latter elements requiring a considerable input by engineering and quality assurance departments.
Filter Manufacture
Crystal filters consist of multiple discrete crystal or monolithic dual elements assembled on a printed circuit board (PCB) with other passive elements (inductors, transformers, capacitors etc.), the total unit being hermetically sealed in a metal casing. The basic manufacturing actions for filter production are crystal devices, printed circuit board (pcb) assembly, filter alignment, encapsulation and closing assessment. Additionally to crystal filters other customized filters may also be created; (e.g. LC filters,) for creation of these parts numerous non-crystal elements for example wound coils are needed.
more...
http://pcbonline.snack.ws/what-factors-that-can-influence-impedance-control.html
Just about every machine and mobile wireless device from mobile phones to remote controlled gadgets have quartz crystals designed into them for exact timing and frequency management.
Typical Applications include:
Security cameras
Radio transmitters
Cell phones
Navigation
Sensors
Computer disk drives
Computers
Crystal Production
Crystal creation occurs in two stages, optical and electrical:
Optical
Crystal production begins with the selection of quartz crystal blanks of the correct thickness and cut orientation from a comprehensive library of quartz blanks. Subsequent processes consist of lapping, polishing and contouring operations to supply quartz blanks with precisely given sizing, shape, orientation and surface finish to ensure the accurate electrical properties of the completed items.
Electrical
The optical stages of manufacture are followed by electrical stages including etching and cleaning China PCB Prototype, vacuum deposition of gold or silver electrodes, mounting and bonding, adjustment to closing frequency, encapsulation, marking and final quality assurance inspection.
Crystal oscillator Production
Crystal oscillator units are created by using both thick film hybrid substrates and printed circuit board techniques. Depending upon the application, the oscillator crystal may be integrated as an independently sealed device or as an un-encapsulated crystal blank. With the latter circumstance, the blank is mounted directly onto the oscillator substrate and the completed assembly is modified to final frequency before hermetic sealing. Devices produced by an oscillator manufacturer normally includes regular CMOS/TTL oscillators, ECL/PECL output oscillators, Voltage Controlled Crystal Oscillators (VCXOs), Temperature Controlled Crystal Oscillators(TCXOs) flex PCB, and Oven Controlled Crystal Oscillators (OCXOs), these latter elements requiring a considerable input by engineering and quality assurance departments.
Filter Manufacture
Crystal filters consist of multiple discrete crystal or monolithic dual elements assembled on a printed circuit board (PCB) with other passive elements (inductors, transformers, capacitors etc.), the total unit being hermetically sealed in a metal casing. The basic manufacturing actions for filter production are crystal devices, printed circuit board (pcb) assembly, filter alignment, encapsulation and closing assessment. Additionally to crystal filters other customized filters may also be created; (e.g. LC filters,) for creation of these parts numerous non-crystal elements for example wound coils are needed.
more...
http://pcbonline.snack.ws/what-factors-that-can-influence-impedance-control.html
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