| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2001: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2000: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Research Abstract |
The purpose of this study is to fabricate ultrahigh-frequency chaos generator circuits using resonant tunneling diodes and to establish new signal generation/processing technologies using them.
We mainly studied the forced Van der Pol oscillator, which is a simple circuit consisting of a resonant tunnelmg diode, a capacitor, and an inductor. This circuit outputs various signal patterns depending on the frequency, amplitude, and a bias voltage of the oscillating input. First, we confirmed the basic operation of the circuit by numerical simulation, and here we found that this circuit can be used as an ultra-high speed frequency divider. Next, we fabricated the monolithic microwave integrated circuits (MMICs) on InP substrates using RTD/HEMT integration technology. Then, we demonstrated high frequency operation of the circuits at frequencies as high as 50 GHz, The maximum is hmited by the HEMT used in the output buffer, so the extremely high frequency operation close to theoperation frequency cutoff frequency of the RTD is expected with appropriate circuit design.
In addition to this another type of chaos generator circuit, the shift map chaos generator, was studied using CMOS RTD emulation circuit. We demonstrated its basic operations using VDEC (VLSI Design and Education Center) 0.6um CMOS chip fabrication program.
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