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Delta-Sigma Modulator Using a Resonant-Tunneling Diode Quantizer

Miwa MUTOH, Hiroyuki FUKUYAMA, Toshihiro ITOH, Takatomo ENOKI, Tsugumichi SHIBATA

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Summary :

A novel delta-sigma modulator that utilizes a resonant-tunneling diode (RTD) quantizer is proposed and its operation is investigated by HSPICE simulations. In order to eliminate the signal-to-noise-and-distortion ratio (SINAD) degradation caused from the poor isolation of a single-stage quantizer (1SQ), a three-stage quantizer (3SQ), which consists of three cascoded RTD quantizers, is introduced. At a sample rate of 10 Gsps (samples per a second) and a signal bandwidth of 40 MHz (oversampling ratio of 128), the modulator demonstrates a SINAD of 56 dB, which corresponds to the effective number of bits of 9.3.

Publication
IEICE TRANSACTIONS on Electronics Vol.E85-C No.5 pp.1219-1221
Publication Date
2002/05/01
Publicized
Online ISSN
DOI
Type of Manuscript
LETTER
Category
Electronic Circuits

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