A5038559388- Radio Frequency Integrated Circuit Design
- Quantum and electron transport phenomena
- Advancements in PLL and VCO Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Quantum Computing Algorithms and Architecture
- Analog and Mixed-Signal Circuit Design
- Semiconductor materials and devices
- Advanced Power Amplifier Design
- Photonic and Optical Devices
- Quantum Information and Cryptography
- Quantum-Dot Cellular Automata
- Semiconductor Lasers and Optical Devices
- Microwave Engineering and Waveguides
- Electromagnetic Compatibility and Noise Suppression
- Semiconductor Quantum Structures and Devices
- Low-power high-performance VLSI design
- Full-Duplex Wireless Communications
- Diamond and Carbon-based Materials Research
- Magnetic properties of thin films
- Acoustic Wave Resonator Technologies
- Wireless Body Area Networks
- Optical Network Technologies
- Electronic and Structural Properties of Oxides
- Electrostatic Discharge in Electronics
- Magneto-Optical Properties and Applications
Delft University of Technology
2016-2025
QuTech
2018-2025
Sadra Institute Of Higher Education
2022
University of Kentucky
2020
University of Minnesota
2020
Rochester Institute of Technology
2020
Colorado State University
2020
Drexel University
2020
University of Utah
2020
Computing Center
2020
A fault-tolerant quantum computer with millions of bits (qubits) requires massive yet very precise control electronics for the manipulation and readout individual qubits. CMOS operating at cryogenic temperatures down to 4 K (cryo-CMOS) allows closer system integration, thus promising a scalable solution enable future computers. In this paper, is proposed, along required specifications, interface classical processor. To prove advantages such system, functionality key circuit blocks...
An oscillator topology demonstrating an improved phase noise performance is proposed in this paper. It exploits the time-variant model with insights into conversion mechanisms. The based on enforcing a pseudo-square voltage waveform around LC tank by increasing third-harmonic of fundamental oscillation through additional impedance peak. This auxiliary peak realized transformer moderately coupled resonating windings. As result, effective impulse sensitivity function (ISF) decreases thus...
In this paper, we propose a method to reduce flicker (1/f) noise upconversion in voltage-biased RF oscillators. Excited by harmonically rich tank current, typical oscillation voltage waveform is observed have asymmetric rise and fall times due even-order current harmonics flowing into the capacitive part, as it presents lowest impedance path. The results an effective impulse sensitivity function of nonzero dc value, which facilitates 1/f oscillator's 1/f3 phase noise. We demonstrate that if...
This paper proposes a mm-wave frequency generation technique that improves its phase noise (PN) performance and power efficiency. The main idea is fundamental 20 GHz signal sufficiently strong third harmonic at 60 are generated simultaneously in single oscillator. desired local oscillator (LO) delivered to the output, whereas can be fed back for detection phase-locked loop. Third-harmonic boosting extraction techniques proposed applied generator. A prototype of generator implemented digital...
A quantum computer comprises both qubits and their classical electronic interface. While much research is currently devoted solely to qubits, an efficient controller also urgently needed for a scalable computer. This study uses analytical techniques expose the effect of nonideal circuit blocks in on qubit fidelity, all required operations, how fidelity affected by limited performance general-purpose, room-temperature equipment typically used with few types available today. Tailor-made...
We present an ultra-low-power Bluetooth low-energy (BLE) transceiver (TRX) for the Internet of Things (IoT) optimized digital 28-nm CMOS. A transmitter (TX) employs all-digital phase-locked loop (ADPLL) with a switched current-source digitally controlled oscillator (DCO) featuring low frequency pushing, and class-E/F2 power amplifier (PA), high efficiency. Low 1/f DCO noise allows ADPLL to shut down after acquiring lock. The receiver operates in discrete time at sampling rate (~10...
Building a large-scale quantum computer requires the co-optimization of both bits (qubits) and their control electronics. By operating CMOS circuits at cryogenic temperatures (cryo-CMOS), hence in close proximity to solid-state qubits, compact quantum-computing system can be achieved, thus promising scalability large number qubits required practical application. This work presents cryo-CMOS microwave signal generator for frequency-multiplexed 4 × 32 (32 per RF output). A digitally intensive...
In this paper, we propose a new class of operation an RF oscillator that minimizes its phase noise.The main idea is to enforce clipped voltage waveform around the LC tank by increasing second-harmonic fundamental oscillation through additional impedance peak, thus giving rise class-F 2 operation.As result, noise contribution tail current transistor on total can be significantly decreased without sacrificing oscillator's and efficiencies.Furthermore, special impulse sensitivity function (ISF)...
Quantum computers (QC), comprising qubits and a classical controller, can provide exponential speed-up in solving certain problems. Among solid-state qubits, transmons spin-qubits are the most promising, operating ≪ 1K. A qubit be implemented physical system with two distinct energy levels representing |0) |1) states, e.g. up down spin states of an electron. The manipulated microwave pulses, whose frequency f matches level spacing E = hf (Fig. 19.1.1). For transmons, ~ 6GHz, for 20GHz,...
This paper presents a device matching study of commercial 40-nm bulk CMOS technology operated at cryogenic temperatures.Transistor pairs and linear arrays, optimized for matching, were characterized over the temperature range from 300 K down to 4.2 K.The parameters relevant mismatch, i.e., threshold voltage current factor, extracted, which change in both absolute value variability as function size investigated.It is shown that Pelgrom scaling law valid also simplified Croon model able...
Quantum Error Correction (QEC) is required in quantum computers to mitigate the effect of errors on physical qubits. When adopting a QEC scheme based surface codes, error decoding most computationally expensive task classical electronic back-end. Decoders employing neural networks (NN) are well-suited for this but their hardware implementation has not been presented yet. This work presents space exploration fully-connected feed-forward NN decoders small distance codes. The goal optimize...
We propose a new transmitter architecture for ultra-low power radios in which the most energy-hungry RF circuits operate at supply just above threshold voltage of CMOS transistors. An all-digital PLL employs digitally controlled oscillator with switching current sources to reduce and without sacrificing its startup margin. It also reduces 1/f noise pushing, thus allowing ADPLL, after settling, sampling rate or shut it off entirely during direct DCO data modulation. The amplifier integrates...
This paper presents the characterization and modeling of microwave passive components in TSMC 40-nm bulk CMOS, including metal-oxide-metal (MoM) capacitors, transformers, resonators, at deep cryogenic temperatures (4.2 K). To extract parameters components, pad parasitics were de-embedded from test structures using an open fixture. The variations capacitance, inductance quality factor are explained relation to temperature dependence physical parameters, resulting insights on passives...
Quantum computing holds the promise to achieve unprecedented computation power and solve problems today intractable. State-of-the-art quantum processors consist of arrays bits (qubits) operating at a very low base temperature, typically few tens mK, as shown in Fig. 15.5.1 The qubit states degrade naturally after certain time, upon loss coherence. For proper operation, an error-correcting loop must be implemented by classical controller, which, addition handling execution algorithm, reads...
Quantum computers1 could revolutionize computing in a profound way due to the massive speedup they promise. A quantum computer comprises cryogenic processor and classical electronic controller. When scaling up at least few thousands, possibly millions, of qubits required for any practical algorithm, CMOS (cryo-CMOS) electronics is allow feasible compact interconnections between controller processor. Cryo-CMOS leverages fabrication infrastructure while exploiting continuous improvement...
Quantum computers (QC) promise to solve certain computational problems exponentially faster than a classical computer due the superposition and entanglement properties of quantum bits (qubits). Among several qubit technologies, spin qubits are promising candidate for large-scale QC, since (1) they have small footprint allowing them be densely integrated (2) can operate at relatively high temperatures (>1K) [1], potentially reducing system cost complexity.
This work presents a self-heating study of 40-nm bulk-CMOS technology in the ambient temperature range from 300 down to 4.2. A custom test chip was designed and fabricated for measuring both rise MOSFET channel surrounding silicon substrate, using gate resistance diodes as sensors, respectively. Since depends on factors such device geometry power density, structure characterized this specifically resemble actual devices used cryogenic qubit control ICs. Severe observed at deep-cryogenic...
This paper proposes an ultra-low-voltage (ULV) fractional-N all-digital PLL (ADPLL) powered from a single 0.5-V supply. While its digitally controlled oscillator (DCO) runs directly at 0.5 V, internal switched-capacitor dc-dc converter "doubles" the supply voltage to all digital circuitry and particularly regulates time-to-digital (TDC) stabilize resolution, thus maintaining fixed in-band phase noise (PN) across process, voltage, temperature (PVT). The ADPLL supports two-point modulation...
Spins associated to solid-state color centers are a promising platform for investigating quantum computation and networks. Recent experiments have demonstrated multiqubit processors, optical interconnects, basic error-correction protocols. One of the key open challenges towards larger-scale systems is realize high-fidelity universal gates. In this work, we design demonstrate complete gate set two-qubit system formed by electron nuclear spin nitrogen-vacancy center in diamond. We use...
The 1/f (flicker) noise upconversion degrades the close-in spectrum of CMOS RF oscillators. resulting <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> phase (PN) can be an issue in PLLs with a loop bandwidth <;1MHz, which practically implies all cellular phones. A previously published noise-filtering technique [1] and adding resistors series g <sub xmlns:xlink="http://www.w3.org/1999/xlink">m</sub> -device drains [2] have shown...
Accurate and low-noise generation amplification of microwave signals are required for the manipulation readout quantum bits (qubits). A fault-tolerant computer operates at deep cryogenic temperatures (i.e., <; 100mK) requires thousands qubits running practical algorithms. Consequently, CMOS radio-frequency (RF) integrated circuits operating down to 4 K (Cryo-CMOS) offer a higher level system integration scalability future computers. In this paper, we extensively discuss role, benefits,...
The design of cryogenic interface electronics enabling future scalable quantum computers requires the accurate characterization and modeling nanometer CMOS processes at temperatures. To this end, paper presents mismatch 40-nm bulk transistors over temperature range from 300 K down to 4.2 K. Measured data confirm that variability increases temperatures, analysis such proves validity both Pelgrom Croon models, which describe dependency on device area bias conditions, respectively.