Ultrahigh frequency integrated circuits using resonant tunneling diodes

本计画的目的是建立使用共振隧穿二极体（RTD）的超高速积体电路技术。本项目主要分为三个部分：1）基于共振隧穿逻辑门MOBILE的高性能模数转换器（ADC）的研制; 2）基于MOBILE的具有100 fs左右超短门延迟时间的逻辑门的研制; 3）双频混沌电路的研制及其应用。研究的细节如下所示。1）移动的是一种高速逻辑门，利用由两个串联RTD组成的电路的单稳态到双稳态的转变。具有边沿触发和锁存功能，开关时间短。这些特性使其适合ADC中的量化器应用。我们研究了使用移动的的Δ-Σ ADC，因为其性能强烈依赖于工作频率，并且不需要精确的模拟元件。我们提出了一种新的delta sigm ...更多信息 一种使用移动的的调制器，它基于FM Δ Σ调制概念。我们演示了Δ-Σ调制器在20 GHz的双频工作。2）C^2MOBILE（Capacitor-Coupled Monostable-Bistable Transition Logic Element）是移动的的扩展，它是一种基于电容耦合单稳态-双稳态转换逻辑元件的新型调制器。C^2MOBILE利用通过耦合电容的瞬态电流在栅极之间传输信号，预期可在极短的栅极延迟时间内工作。C^2MOBILE的基本操作已经用在InP衬底上制作的电路演示过了。所测试的电路是2级和3级逻辑电路以及AND/OR门。这些电路的门延迟时间估计约为1 ps。随着复杂的电路设计和制造工艺的发展，门延迟时间可以缩短到100 fs左右。3）基于混沌系统的分岔特性，提出了RTD混沌发生器及其在变比分频器中的应用。利用该电路实现了88 GHz的1/2分频器工作。此外，我们提出了一种控制该系统中的混沌的技术。使用这种技术，我们证明了在微波频率范围内的混沌信号的直接观察。少

The purpose of this project is to establish ultrahigh speed integrated circuit technology using resonant tunneling diodes (RTDs). The project is divided into three parts ; 1) to develop high performance analog to digital converters (ADC) based on resonant tunneling logic gate, MOBILE, 2) to develop logic gates based on the MOBILE having ultra short gate delay time of around 100 fs, 3) to develop ultrahigh frequency chaos circuits and their applications. The details of the studies are shown below.1) The MOBILE is a high speed logic gate exploiting the monostable to bistable transition of a circuit consisting of two serially connected RTDs. It features edge-trigger and latching function as well as short switching time. These features make it suitable for the quantizer application in ADCs. We investigated the delta sigma ADC using the MOBILE, since the performance of which strongly depends on the operating frequency, and requires no precise analog component. We proposed a novel delta sigm … More a modulator using a MOBILE, which is based on the FM delta sigma modulation concept. We demonstrated ultrahigh frequency operation of delta sigma modulator at 20GHz. Furthermore, we proposed novel technique to surmount difficulties of FM delta sigma modulation, which have hindered the use of FM delta sigma modulation.2) The C^2MOBILE (Capacitor-Coupled Monostable-Bistable Transition Logic Element) is an extension of the MOBILE. The C^2MOBILE uses the transient current through the coupling capacitor to transmit signals between gates, and is expected to operate with an extremely short gate delay time. Basic operations of the C^2MOBILE have been demonstrated with the circuits fabricated on InP substrates. The circuit tested are the 2- and 3-stage logic circuits and the AND/OR gate. The gate delay time was estimated to be around 1 ps for these circuits. Much shorter gate delay time close to 100 fs should be possible with the sophisticated circuit design and fabrication process.3) We proposed the RTD chaos generator and its application to a variable-ratio frequency-divider, which is based on the bifurcation phenomenon characteristic of chaos systems. 88 GHz operation of 1/2 frequency divider was demonstrated using this circuit. Furthermore, we proposed a technique to control chaos in this system. Using this technique we demonstrated direct observation of the chaotic signals in the microwave frequency range. Less