Wide bandwidth oscillator/counter A/D converter

被引:7
作者
Johnson, MW [1 ]
Dalrymple, BJ [1 ]
Durand, DJ [1 ]
Herr, QP [1 ]
Silver, AH [1 ]
机构
[1] TRW Space & Technol Grp, Redondo Beach, CA 90275 USA
关键词
analog-to-digital converter; ADC; single flux quantum electronics; LTS;
D O I
10.1109/77.919418
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
We present theory and performance data on oscillator/counter AID converters fabricated in TRW's Nb process. Circuits with junction critical current density of 2 kA/cm(2) are discussed, This simple, low power A/D converter architecture is uniquely enabled by the wide bandwidth voltage-controlled oscillator (VCO) and compatible, ultra-fast superconductor single-flux-quantum (SFQ) divide-by-two flip-flops, The measured signal-to-noise ratio (SNR), frequency response, and signal distortion are discussed within the framework of a basic theory of performance as well as time-domain simulations. Noise contributions from quantization error, aperture jitter, and thermal noise are included. The measured signal-to-noise ratio (SNR) is shown to be within a few dB of theoretical performance over more than two decades of frequency. The frequency response is shown to fit well to the expected function through I GHz of signal frequency. Harmonic distortion is shown to be consistent with the non-linearity in the front-end's DC I-V characteristic which is subject to design improvement, This architecture extends to higher performance using a multi-junction VCO, Measured two-junction VCO SNR shows essentially the theoretical improvement over that of a single junction.
引用
收藏
页码:607 / 611
页数:5
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