Hao Zheng

Bio: Hao Zheng is an academic researcher from Xidian University. The author has contributed to research in topics: Transimpedance amplifier & Dynamic range. The author has an hindex of 6, co-authored 15 publications receiving 107 citations.

A 77-dB Dynamic Range Low-Power Variable-Gain Transimpedance Amplifier for Linear LADAR

Abstract: An adjustable-gain transimpedance amplifier with a wide linear dynamic range, low power consumption, and low input impedance was designed for a pulsed linear laser detection and ranging system. To extend the linear dynamic range within a low power consumption, some specific techniques are presented. A low-power current-mirror amplifier with a level shifter was used to decrease the input impedance and keep it stable. Adjustable transimpedance gain extends the input dynamic range, and a high-pass filter eliminates the influence of dc operating point drift caused by the variable gain. When implemented in 0.18- ${\mu }\text{m}$ standard CMOS technology, the receiver achieved a high gain of 106 dB with four configurable gain modes, a wide linear output swing of 1 V, an input-referred noise current of $1.52~ {\rm p{A}/ \sqrt {Hz}}$ , and a minimum detectable signal of 400 nA at SNR = 5, leading to a linear dynamic range of 77 dB, and the power consumption in the highest gain mode was 8 mW with a 3.3-V supply.

A Low Walk Error Analog Front-End Circuit With Intensity Compensation for Direct ToF LiDAR

Abstract: An analog front-end (AFE) circuit comprising an amplifier module, a peak detector, and a timing discriminator has been designed to facilitate the target identification for direct time-of-flight (dToF) LiDAR. The amplitude saturation error (ASE) is compensated in this article for the intensity determination, which is conducted based on the combination of the pulse width and peak detector. Together with the improved walk error compensation scheme, the proposed AFE circuit can attain the distance and intensity information simultaneously with lower cost and larger dynamic range. A specific frequency compensation method is proposed with a shunt feedback TIA, which improves the stability and mitigates the impact of the package parasitics. The measured -3-dB bandwidth, transimpedance gain, and the input-referred noise current are 281 MHz, 86 dB $\Omega $ , and 4.68 pA/ $\surd $ Hz respectively. The proposed AFE circuit, which is fabricated in $0.18~\mu \text{m}$ CMOS technology, achieves the distance accuracy of ±30 ps and the intensity accuracy of ±4% in the dynamic range of 1:5000 without gain control scheme.

A Linear Dynamic Range Receiver With Timing Discrimination for Pulsed TOF Imaging LADAR Application

Abstract: This paper presents a linear and wide dynamic range (DR) receiver for pulsed time-of-flight imaging laser detection and ranging application, which can capture the pulsed echo intensity. The alternative leading edge timing discrimination scheme with two threshold voltages by differential voltage shift is utilized to compensate the walk error, and thus accurately obtain timing information. The proposed receiver was implemented and fabricated in a 0.18- $\mu \text{m}$ CMOS technology. The receiver achieves a high differential transimpedance gain of 106 dB $\Omega $ , a wide differential output swing of about 1.8 V, an input-referred noise current of 4.55 pA/Hz0.5 and a minimum detectable signal of about $0.28~\mu $ Arms at SNR = 5, leading to a linear DR of 66 dB with a 3.3-V power supply. The area of the receiver chip is equal to $0.95\times0.95$ mm2.

High Sensitivity and Wide Dynamic Range Analog Front-End Circuits for Pulsed TOF 4-D Imaging LADAR Receiver

Abstract: Analog front-end (AFE) circuits, which mainly consist of a transimpedance amplifier (TIA) with wide dynamic range and a timing discriminator with double threshold voltage, were designed and implemented for a pulsed time-of-fight 4-D imaging LADAR receiver. The preamplifier of the proposed TIA adopts a shunt-feedback topology to amplify weak echo signal, and a current-mirror topology to amplify strong one, respectively. The proposed AFE can capture directly the pulsed echo amplitude with wide dynamic range through programmable gain control switches. The proposed AFE circuits, which achieve a high gain of 106 dB $\Omega $ , a linear dynamic range of 80 dB, an averaged input-referred noise density of 0.89 pA/Hz0.5 and a minimum detectable signal of $0.36~\mu \text{A}$ at SNR = 5, and a sensitivity of 8 nW with APD of 45 A/W, were designed with 3.3 V devices and fabricated in a 0.18- $\mu \text{m}$ standard CMOS process. The total area of AFE, which includes the circuit core, bandgap and bias circuits, and I/O PAD, is approximately equal to $1.20\times 1.13$ mm2.

A 66-dB Linear Dynamic Range, 100-dB· $\Omega$ Transimpedance Gain TIA With High-Speed PDSH for LiDAR

Abstract: A wide dynamic range (DR) receiver for the linear pulsed light detection and ranging (LiDAR) is presented, including a high linear DR transimpedance amplifier (TIA) with digital codes to vary its gain and a high-speed peak detector sample and hold (PDSH) circuit to capture the peak value of echo pulses. In order to extend the linear DR without reducing the bandwidth, a source follower is introduced to turn the common-gate amplifier into a large swing current mirror amplifier, leading to stable and low input impedance and three programmable transimpedance gain modes. For improving the precision of the PDSH circuit, a variable current source is utilized to replace the rectifying current mirror to alleviate the overshoot and pedestal voltage error. Implemented in 0.18- $\mu \text{m}$ standard CMOS technology, the proposed TIA achieves a high linear DR of 66 dB with a wide bandwidth of 110 MHz, and the highest gain reaches 100 dB· $\Omega $ . The error of PDSH circuit is less than 0.4% for 70-ns peaking width pulses with amplitude from 100 mV to 1.1 V. The receiver chip consumes 21 mW with a single 3.3-V supply, where the TIA and PDSH consume 8 and 13 mW, respectively.

Design Of Analog Cmos Integrated Circuits

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Design Of Integrated Circuits For Optical Communications

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Digital Electronics and Analog Photonics for Convolutional Neural Networks (DEAP-CNNs)

Abstract: Convolutional Neural Networks (CNNs) are powerful and highly ubiquitous tools for extracting features from large datasets for applications such as computer vision and natural language processing. However, a convolution is a computationally expensive operation in digital electronics. In contrast, neuromorphic photonic systems, which have experienced a recent surge of interest over the last few years, propose higher bandwidth and energy efficiencies for neural network training and inference. Neuromorphic photonics exploits the advantages of optical electronics, including the ease of analog processing, and busing multiple signals on a single waveguide at the speed of light. Here, we propose a Digital Electronic and Analog Photonic (DEAP) CNN hardware architecture that has potential to be 2.8 to 14 times faster while using almost 25% less energy than current state-of-the-art graphical processing units (GPUs).

A Linear-Mode LiDAR Sensor Using a Multi-Channel CMOS Transimpedance Amplifier Array

Abstract: This paper presents a linear-mode optical sensor for the feasible applications of unmanned vehicle LiDAR systems, in which a pulsed-erbium fiber laser is exploited as a light source and a 16-channel transimpedance amplifier (TIA) array is utilized in an optical Rx module with low-cost InGaAs PIN photodiodes. In particular, a voltage-mode CMOS feedforward (VCF-TIA) is newly proposed to achieve twice higher transimpedance gain with lower noise and similar bandwidth characteristics than a conventional inverter TIA, thereby enabling longer detection. Test chips of the 16-channel VCF-TIA array realized in a standard 0.18- $\mu \text{m}$ CMOS process demonstrate 76.3-dB $\Omega $ transimpedance gain, 6.3-pA/sqrt(Hz) average noise current spectral density, less than −33-dB crosstalk between channels, and 29.8-mW power dissipation per channel from a single 1.8-V supply. Automatic gain control is also equipped to extend input dynamic range for near-range detection. Hence, the proposed linear-mode optical sensor clearly detects the reflected optical pulses from the target of 5% reflection rate within the range of 0.5–25 m.