ISSTT Proceedings

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Lossy-Line Stabilization of Negative-Resistance Diodes for Integrated-Circuit Oscillators

Authors:
Karl D. Stephan, Sai-Chu Wong, Elliot R. Brown
Abstract:
Diodes that show negative differential resistance from DC up to 700 GHz are now available. To exploit these devices, a submillimeter-wave oscillator circuit must encourage oscillation near the upper frequency limit while discouraging oscillation at all lower frequencies. This is not easy. In this paper we describe a tool in the circuit designer's kit which may prove useful in the development of integrated-circuit submillimeter-wave oscillators using resonant-tunneling diodes or other negative-resistance devices. A lossy transmission line of sufficient length presents a nearly constant impedance to its load while furnishing a convenient pathway for DC bias. Following a Smith-chart presentation of the stabilization problem, we describe two microwave oscillator circuits that use lossy transmission lines for diode stabilization. One used a conventional tunnel diode in a quasioptical 2-GHz oscillator, and the other employed a resonant tunneling diode in a quasioptical-cavity-stabilized circuit at 9 GHz.
Categories:
Oscillators
Year:
1991
Session:
2
Full-text:
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Page Number(s):
154-162