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    Please use this identifier to cite or link to this item: http://ir.lib.ksu.edu.tw/handle/987654321/14276


    Title: A VHF Oscillator Design Based on BJT Cascode Active Load Differential Amplifier
    Authors: Cher-Shiung Tsai
    Shu-Yin Jiang
    Ming-Yuan Guo
    Kwang-Jow Gan
    Pei-Hua Chang
    Keywords: Diff Amp
    FFT
    SNR
    VCO
    Date: 2007-09-28
    Issue Date: 2007-10-01 16:13:51 (UTC+8)
    Abstract: Abstract—In this paper, we present a VHF (Very High Frequency) band oscillator which mainly composed of a BJT cascode active load differential amplifier (Diff. amp). We use Hspice to verify that the cascode active load differential amplifier oscillator output frequency is 800 MHz at 2.5 volts power supply under CIC 0.18um-Si process. We also use discrete devices on bread board to prove the circuit is an oscillator circuit. Those experiments show such an oscillator can work stably from 4.0 to 6.0 volts. Their output frequency will be 158.2 MHz, 183.2 MHz under 4.0 volts and 6.0 volts respectively. We use FFT (Fast Fourier Transform) diagram to analyze these oscillators and shows SNR (Signal-to-Noise Ratio) values. Finally, those experimental results reveal that the oscillator is a nice voltage controlled oscillator (VCO) and also have good SNR characteristics.
    Appears in Collections:[電子工程系所] 2007年系統雛型與電路設計創新應用研討會

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