Graduate Thesis Or Dissertation
 

An integrated MOS voltage-controlled low frequency oscillator

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  • In this work the use of linear MOS integrated circuits in the design of a phase-shift oscillator is presented. By multiplying the capacitors of the RC feedback network through the use of the Miller effect, large effective capacitance values are obtained which enable the low frequency operation of the oscillator. MOS devices are also used as resistors in the feedback network. Thus the oscillator is easily tuned by an external voltage over a range of 30 Hz-8 KHz. In the design range of 500-1500 Hz the output frequency is directly related to the tuning voltage with a slope of -500 Hz/volt. A scheme of automatic frequency stabilization is suggested. The design and results of a typical fabricated device of this variety are also presented. It is thus shown that a complete system employing only MOS devices is practical and may replace some of the present bipolar circuits in due course.
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