10-GHz Operation of Multiple-Valued Quantizers Using Resonant-Tunneling Devices

Toshihiro ITOH  Takao WAHO  Koichi MAEZAWA  Masafumi YAMAMOTO  

IEICE TRANSACTIONS on Information and Systems   Vol.E82-D   No.5   pp.949-954
Publication Date: 1999/05/25
Online ISSN: 
Print ISSN: 0916-8532
Type of Manuscript: Special Section PAPER (Special Issue on Multiple-Valued Logic and Its Applications)
Category: Circuits
resonant tunneling diode,  HEMT,  multiple-valued logic,  negative differential resistance,  

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We study ultrafast operation of multiple-valued quantizers composed of resonant-tunneling diodes (RTDs) and high electron mobility transistors (HEMTs). The operation principle of these quantizers is based on the monostable-multistable transition logic (MML) of series-connected RTDs. The quantizers are fabricated by monolithically integrating InP-based RTDs and 0.7-µm-gate-length HEMTs with a cutoff frequency of 40 GHz. To perform high-frequency experiments, an output buffer and termination resistors are attached to the quantizers, and the quantizers are designed to accommodate high-frequency input signals. Our experiments show that both ternary and quaternary quantizers can operate at clock frequencies of 10 GHz and at input frequencies of 3 GHz. This demonstrates the potential of applying RTD-based multiple-valued quantizers to high-frequency circuits.