Abstract
The basic theory of a space-charge transit-time oscillator is outlined in which phase lag of current is caused by using low-velocity injection. Large negative resistances are anticipated at microwave frequencies, giving generation of moderate power levels with low-noise operation. Approximate design calculations for a representative idealised structure 100 μm square, based on silicon and operating at a frequency of 10 GHz, suggest a negative resistance of −50 Ω and a negative Q factor of -π/2, with a maximum output power of about 1 W and an efficiency of about 7%.
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