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With the rapid development of 3G communications, RF circuits are becoming more widespread, so the electronic components VCO's applications grows ever wider, because it is the core module in the oscillator circuit. A voltage-controlled oscillator automatic test system based on GPIB bus is introduced. This system and computer combination has changed the traditional manual operation, VCO production efficiency...
The low phase noise Voltage-Controlled Oscillator (VCO) that has been used in GSM system is manufactured by circuit simulation. Under the condition of ensuring tuning range, the phase noise of VCO is effectively reduced. The designed VCO has center frequency of 825 MHz, the tuning bandwidth 63 MHz, the tuning voltage 1.8-4.5 V, the tuning sensitivity 22.5 MHz / V, and the phase noise -116 dBc/Hz/10...
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