Hanjun Jiang

Tsinghua University | TH · Institute of Microelectronics

The olfactory sensory system of Drosophila has several advantages, including low power consumption, high rapidity and high accuracy. Here, we present a biomimetic intelligent olfactory sensing system based on the integration of an 18-channel microelectromechanical system (MEMS) sensor array (16 gas sensors, 1 humidity sensor and 1 temperature senso...

A 4–6GHz cryogenic radio frequency digital-to-analog converter (RF-DAC) is presented for quantum computing application in this brief. The RF-DAC is implemented with a switched-capacitance topology for its characteristic of being insensitive to cryogenic temperature. A cross-connection switched capacitor array is also integrated into the RF-DAC to e...

It is expected that a useful quantum computing (QC) system would require millions of qubits within one system. The state-of-the-arts QC systems contain hundreds of qubits, which is still several orders of magnitude away from the ultimate goal. To scale the QC system, namely, to increase the number of qubits and QC circuit layers, and also to improv...

An always-on electrocardiogram (ECG) anomaly detector (EAD) with ultra-low power (ULP) consumption is proposed for continuous cardiac monitoring applications. The detector is featured with a 1.5-bit non-feedback delta quantizer (DQ) based feature extractor, followed by a multiplier-less convolutional neural network (CNN) engine, which eliminates th...

This article presents a cryogenic transmon qubit state controller integrated circuit (IC) working at a temperature of 3.5 K for superconducting quantum computing (QC) applications. The qubit state controller IC comprises a polar-modulation-based XY -path driver and a current-steering digital-to-analog converter (DAC)-based Z -path driver. To ge...

A quarter‐rate PAM‐4 FFE employing INCC 1UIPG is implemented in 65 nm CMOS. The proposed INNC 1UIPG reduces the average transition time by ~20%, saving clocking power consumption by ~1.5X, lowering jitter amplification by about 2~5 dB compared with previous works. Along with the bandwidth‐ and power‐efficient partially segmented tailless 1‐stage fr...

This brief presents a brief overview of cryogenic CMOS circuits for large-scale quantum computing, especially the cryogenic RF circuits from the functional blocks to system-level ASICs. To start with, the cryogenic CMOS device characteristics of the process nodes ranging from 180nm to 5nm are examined and compared. The cryogenic RF blocks including...

The hardware architecture of a deep-neural-network-based feature point extraction method is proposed for the simultaneous localization and mapping (SLAM) in robotic applications, which is named the Feature Point based SLAM Network (FPSNET). Some key techniques are deployed to improve the hardware and power efficiency. The data path is devised to re...

Exponential calculation is widely used in different algorithms, such as the activation functions of artificial neural networks. However, it is hard to implement on FPGA, consuming much time and resources. In this work, a novel exponential calculation module for fixed-point number is proposed based on the theory of Fast InvSqrt. The proposed exponen...

This article presents an ultralow-power (ULP) microelectromechanical system (MEMS)-based phase-tracking frequency shift keying (FSK) transceiver (TRX) with an embedded envelop detector-based on–off keying (OOK) wake-up receiver (WuRX). The system supports a shared antenna interface of FSK-matched filter for TRX and a matching network for the FSK re...

This article presents a 915-MHz ultra-low-power (ULP) sub-sampling phase-tracking receiver (SSPT-RX). It is targeted for the power-constrained devices that need short range but medium high-speed data receiving, such as the multi-channel neural stimulator with arbitrary waveform generation. The zero-intermediate frequency (zero-IF) phase-tracking re...

This letter presents a 4-level Pulse Amplitude Modulation (PAM-4) Feed Forward Equalizer (FFE) with a novel Internal-Node-Charge-Controlled 1-Unit Interval Pulse Generator (INCC 1UIPG). Partially segmented architecture and tailless 1-stage front-end are chose to reduce the overall load capacitance for better bandwidth and power performance. The pro...

This paper presents an ultra-low power electrocardiography (ECG) processor application-specific integrated circuit (ASIC) for the real-time detection of abnormal cardiac rhythms (ACRs). The proposed ECG processor can support wearable or implantable ECG devices for long-term health monitoring. It adopts a derivative-based patient adaptive threshold...

Objective Measurement of lower limb volume in patients with chronic venous disease (CVD) is necessary for assessing severity at the time of diagnosis and evaluating response to therapy administered. Existing methods have some limitations in clinical application and accuracy. The study aimed to investigate the reliability and validity of a three-dim...

Transcranial magnetic stimulation (TMS) is capable of stimulating neurons in the brain non-invasively and provides numerous possibilities for the treatment of various neurological disorders such as major depressive disorder, Parkinson's disease, obsessive compulsive disorder. TMS coils can affect the distribution of induced electric fields signific...

A sub-1GHz transmitter (TX) integrated chip (IC) with ultra-low power consumption and moderately high adjacent channel power rejection (ACPR) is presented for in-body bio-sensing applications. The 400 MHz 12-phase digital power amplifier (DPA) is implemented with the proposed 16QAM modulation scheme to improve the energy efficiency. The TX IC also...

An ultra-low power ECG processor ASIC (application specific integrated circuit) with R-wave detection and data compression is presented, which is designed for the long-term implantable cardiac monitoring (ICM) device for arrhythmia diagnosis. An adaptive derivative-based detection algorithm with low computation overhead for potential arrhythmia rec...

Human bowel sounds (BSs) convey valuable information on gastrointestinal health. Recently, the application of wearable healthcare systems has made it possible to monitor long-term human BSs. However, for the sake of protecting user privacy and reducing the data transmission volume, it is necessary to conduct coarse-grained BS sifting at the wearabl...

An ultra-low power low noise analog front end (AFE) is presented in this work, aiming for long-term ECG with clear P-waves for clinical diagnose. The proposed AFE achieves a noise-efficient-factor (NEF) of 2.4 and an input-referred noise of 0.39 Vrms in the best case, which shows 3.7X noise improvements among the state-of-the-art designs. The chopp...

DC-DC Converters for driving microactuators in microelectromechanical systems (MEMS) normally demand higher conversion ratios and stricter volume and weight than those in solar photovoltaic (PV) applications. This brief proposes a novel ultrahigh step-up coupled-inductor DC-DC converter with soft-switching cell, which operating in DCM with a minimu...

In this paper, we set up a novel audio dataset named Gastrointestinal (GI) Sound Set which includes 6 kinds of body sounds Bowel sound, Speech, Snore, Cough, Groan, and Rub. We do sound event detection (SED) based on it, and can accurately detect 6 types of sound events. First, the GI Sound Set is collected by wearable auscultation devices. To ensu...

Bowel sounds (BSs), typically generated by the intestinal peristalses, are a significant physiological indicator of the digestive system's health condition. In this study, a wearable BS monitoring system is presented for long-term BS monitoring. The system features a wearable BS sensor that can record BSs for days long and transmit them wirelessly...

This article presents a 14-bit 200-Ms/s pipelined analog-to-digital converter (ADC) for wide input frequency range. The ADC adopts a sample-and-hold amplifier-less (SHA-less) 3.5-bit front-end stage. A dedicated path combining architecture is proposed for the flash sub-ADC-based pipeline ADC to reduce the aperture error, and expand the ADC input fr...

Convolutional Neural Network (CNN) has attained high accuracy and it has been widely employed in image recognition tasks. In recent times, deep learning-based modern applications are evolving and it poses a challenge in research and development of hardware implementation. Therefore, hardware optimization for efficient accelerator design of CNN rema...

It is essential but quite challenging to alleviate speech information loss and distortion while developing the speech processing algorithms in hearing aids. Recently, many speech enhancement methods based on deep learning are proven effective. However, most of the algorithms fail to achieve real-time processing, which is significant for hearing aid...

The papers in this special issue present a selection of high quality research papers on wearable and flexible integrated sensors for screening, diagnostics, and treatment. Emerging flexible and wearable physical sensing devices create huge potential for many vital healthcare and biomedical applications including artificial electronic skins, physiol...

Wi-Fi-based indoor position sensing solutions have the advantages of easy integration in mobile phones and low cost by using existing Wi-Fi access points. The mainstream methods are commonly based on the received signal strength indicator (RSSI), which suffers from multipath interference in complicated indoor environments. Through the in-depth anal...

This paper presents a new structure for hearing aids. Normally, the power consumption and user experience are contradictory. The proposed hearing aid structure mainly consists of three parts: the earpieces, the mobile computing platform, and the real-time speech-enhancement application. It can run complex algorithms without carrying out heavy calcu...

The surgery quality of the total knee arthroplasty (TKA) depends on how accurate the knee prosthesis is implanted. The knee prosthesis is composed of the femoral component, the plastic spacer and the tibia component. The instant and kinetic relative pose of the knee prosthesis is one key aspect for the surgery quality evaluation. In this work, a wi...

This work presents a complementary metal–oxide–semiconductor (CMOS) ultra-low power temperature sensor chip for cold chain applications with temperatures down to −60 °C. The sensor chip is composed of a temperature-to-current converter to generate a current proportional to the absolute temperature (PTAT), a current controlled oscillator to convert...

A dynamic loss (DL) is proposed for the one-stage object detectors in computer vision, as an improved version of the focal loss in the literature. The proposed loss features a second-order item which can efficiently scale the conventional loss during training. A gradient update approach is then presented to employ the DL in the mainstream one-stage...

This paper presents a power scalable clock data recovery (CDR) suitable for multilane and multirate applications. To make the power consumption scale with the data rate and guarantee appropriate edge overlaps for the phase interpolation, a delay-locked loop-based global biasing strategy is proposed to automatically adjust the bandwidth of the curre...

An optical tactile sensor technique with 3-dimension (3-D) surface reconstruction is proposed for robotic fingers. The hardware of the tactile sensor consists of a surface deformation sensing layer, an image sensor and four individually controlled flashing light emitting diodes (LEDs). The image sensor records the deformation images when the roboti...

A wireless intracranial pressure (ICP) monitoring system based on the air pressure sensing is proposed in this work. The proposed system is composed of an implantable ICP sensing device and a portable wireless data recorder. The ICP sensing device consists of an air pressure sensor, an ultra-thin air pouch for pressure sensing, and a low-power dedi...

A frequency calibration method for a crystal-less current-controlled ring oscillator is presented. It uses a serial data signal from another chip as the frequency reference. The proposed calibration circuit is composed of the coarse calibration and the fine calibration circuit. The coarse calibration circuit controls a binary weighted biasing curre...

An energy efficient ΔΣ-based transmitter using the digital power amplifier (DPA) with the embedded FIR filtering is proposed in this brief. Compared to the conventional ΔΣ-based transmitters, the proposed architecture has the advantage of low power consumption with the DPA serving as the mixer, filter, and RF amplifier simultaneously. The embedded...

The phase-domain analog-to-digital converter (Ph-ADC) is proved to be more power efficient than traditional amplitude ADCs in wireless receivers . A low power multi-step Ph-ADC for zero intermediate frequency (IF) GFSK receivers as defined in Bluetooth low energy protocol is proposed in this paper. With dedicatedly designed binary code scheme and m...

This paper presents a 40-Gb/s transmitter (TX) and receiver (RX) chipset for chip-to-chip communications in a 65-nm CMOS process. The TX implements a quarter-rate multi-multiplexer (MUX)-based four-tap feed-forward equalizer (FFE), where a charge-sharing-effect elimination technique is introduced into the 4:1 MUX to optimize its jitter performance...

This paper presents an 11-bit 200 MS/s subrange SAR ADC with an integrated reference buffer in 65 nm CMOS. The proposed ADC employs a 3.5-bit flash ADC for coarse conversion, and a compact timing scheme at the flash/SAR boundary to speed up the conversion. The flash decision is used to control charge compensating for the reference voltage to reduce...