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Sub-THz sampling AD converters using resonant tunneling diodes

使用谐振隧道二极管的亚太赫兹采样 AD 转换器

基本信息

批准号：
18360168
负责人：
MAEZAWA Koichi
金额：
$ 10.41万
依托单位：
University of Toyama
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

The purpose of this project is to establish high performance Analog to Digital Conversion (ADC) technology using resonant tunneling logic gate MOBILES (Monostable Bistable Transition Logic Elements). We investigated a novel type of Delta Sigma ADC, which uses frequency modulated intermediate signals (FM Delta Sigma ADC). The details of the studies are shown below.1. First, we proposed a novel resonant tunneling logic gate, SMOBILE (Symmetric MOBILE). The SMOBILE can operate at double-clock rate. Furthermore, its operation is scarcely affected by the output current. These features make the SMOBILE promising for ultrahigh speed operations. 100 Gb/s operation is demonstrated with complementary 50 GHz clocks for circuits fabricated on InP substrates. The SMOBILE is promising for quantizers for high-performance analog-digital converters.2. The output signal of the MOBILE is in a RZ-mode (Return to Zero). This obstructs integration of the MOBILE circuits into conventional circuits. Here we proposed NRZ-MOBILE (Non Return to Zero MOBILE), the output of which is compatible to the conventional circuits. After confirming the basic operation of the NRZ-MOBILE, we investigated its application to the FMDSM (FM Delta Sigma Modulator), which is a key component of the FM Delta Sigma ADCs. Even if we take the threshold voltage fluctuation of the HEMTs into account, good SNDR (Signal to Noise and Distortion ratio) was demonstrated for FMDSM using the NRZ-MOBILE. Moreover, we confirmed SNDR improvement for parallel FMDSM using NRZ-MOBILEs.3. One of the most difficult problems of the FMDSM is to improve linearity of the voltage controlled oscillator (VCO). We proposed complementary VCO approach to solve this problem, where two VCOs are driven by the complementary input signals. It is demonstrated the 2nd harmonic peak can be decreased and the good SFDR can be obtained by this scheme.

本计画的目的是利用共振隧穿逻辑闸MOBILES（Monostable Bistable Transition Logic Elements）建立高效能类比数位转换（ADC）技术。我们研究了一种新型的Delta Sigma ADC，它使用频率调制的中间信号（FM Delta Sigma ADC）。这些研究的详情如下。首先，我们提出了一种新型的共振隧穿逻辑门SMOBILE（Symmetric移动的）。SMOBILE可以以双时钟速率工作。此外，其操作几乎不受输出电流的影响。这些特性使得SMOBILE有希望用于高速操作。100 Gb/s的操作被证明与互补的50 GHz时钟的InP衬底上制造的电路。SMOBILE在高性能模数转换器的量化器中具有广阔的应用前景.移动的的输出信号处于RZ模式（归零）。这阻碍了移动的电路与传统电路的集成。本文提出了NRZ-MOBILE（Non Return to Zero移动的），它的输出与传统电路兼容。在确认NRZ-MOBILE的基本操作后，我们研究了其在FM Delta Sigma ADC的关键部件FMDSM（FM Delta Sigma Modulator）中的应用。即使我们考虑到HEMT的阈值电压波动，使用NRZ-MOBILE的FMDSM也表现出良好的SNDR（信噪比和失真比）。此外，我们还证实了NRZ-MOBILE算法对并行FMDSM的SNDR的改善。FMDSM最困难的问题之一是提高压控振荡器（VCO）的线性度。我们提出了互补VCO的方法来解决这个问题，其中两个VCO由互补的输入信号驱动。仿真结果表明，该方案可以有效降低二次谐波峰值，获得较好的SFDR。