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This paper presents an attitude estimation method used for navigation of an unmanned surface vehicle. The method utilizes measurements by global navigation satellite system (GNSS) as well as microelectromechanical systems-attitude heading reference system (MEMS-AHRS). Since magnetic field measurement by the MEMS-AHRS is vulnerable to internal and external disturbances, the magnetic field measurement...
A single-channel 10b pipelined SAR ADC with a gm-cell residue amplifier and a current-mode fine SAR ADC achieves a 500MS/s conversion rate in a 28nm CMOS process under a 1.0 V supply. With background offset and gain calibration, the prototype ADC achieves an SNDR of 56.6dB at Nyquist. With power consumption of 6mW, it obtains a FoM of 21.7fJ/conversion-step.
A clock generator using an injection-locked oscillator (ILO) offers remarkable jitter performance with low-overhead of additional circuits such as injection switches. Because the injection clock cleans the edge of the oscillator in every injection period, jitter accumulation is avoided. However, the ILO alone causes a severe reference spur owing to the mismatch between the desired oscillation frequency...
Although the LPDDR4 interface has enabled industry requirements, such as low power consumption and high bandwidth, additional evolution of the current LPDDR4 performance is expected. To respond to the need for more power efficient devices with higher bandwidth, a 2nd generation LPDDR4 (referred to as LPDDR4X), with extreme low power and extended performance, has been developed in this work. In the...
To meet ever-growing demands for higher mobile data-rates, LTE standards continue to evolve. While carrier aggregation (CA) improves data-rates, it requires wider aggregated signal bandwidth that limits the number of users that can be serviced. Techniques like 256QAM and 4×4 MIMO are attractive because improvements do not need wider signal bandwidth. To support 256QAM and 4×4 MIMO for the 5GHz band,...
This paper proposes a calibration algorithm for a three degrees-of-freedom (DOF) planar cable-driven parallel robot. The developed calibration algorithm uses a low-cost laser distance sensor to measure the distance between an end-effector and a laser reflector, and also uses the cable lengths measured by using motor encoders. MATLAB simulation results show that using a single laser distance sensor...
Nowadays, the disease related to blood vessel is significantly increasing day by day. Some conventional methods with surgery knife are not suitable anymore due to their precision considering the tiny size of the blood vessel. On this account, to treat intravascular diseases, controllable wireless micro-robot is developed as a feasible alternative for medical treatment. To guide this kind of a micro-robot,...
This paper presents a low noise resistive analog front-end (AFE) with automatic offset calibration loop. The capacitive transimpedance amplifier (CTIA) with correlated double sampling (CDS) technique is adopted to achieve low noise characteristics. The AFE employs automatic offset calibration loop (AOCL) to reduce the offset variations due to the fabrication imperfections. The automatic offset calibration...
The current-steering architecture is widely used in high-speed DACs, since this architecture has good linearity at high speed. Therefore, this thesis adopts the current-steering architecture to design the DAC in order to achieve the high-speed application. The power saving technology for the thermometer-code DAC is proposed in the thesis. This technique can reduce the power consumption and the clock...
A 4.35Gb/s/pin LPDDR4 I/O interface with multi-VOH level, equalization scheme and Duty-Training Circuit (DTC) is presented. A Low Voltage-Swing Terminated Logic (LVSTL) driver using 4-to-1 multiplexer is implemented to the transmitter. A DTC to adjust the CK duty is implemented to the receiver. In addition, a ZQ calibration scheme for Multi-VOH level is also presented. Designed schemes are compatible...
The recent emergence of direct sampling in residential broadband satellite and cable receivers has spurred the need for low-power, high-speed (∼5GS/s), mid-resolution (∼10b) A/D converters. Recently, time-interleaved (TI) SARs have been a popular choice for low-power, medium-speed, mid-resolution ADCs [1-3]. As the conversion rate and resolution requirements increase, TI-SARs become less attractive...
Multiple flat-panel displays may often seem different in color, even though they are of the same brand and model. As a result, users experience visual fatigue as well as degraded quality while watching displayed contents. In this paper, we propose a method of calibrating multiple displays simultaneously with the use of ordinary cameras, such as a smartphone camera. In the proposed method, brightness...
Consumers nowadays demand for more convenient human-device interaction (HDI) in every device they use. As a part of the HDI technologies, remote eye gaze tracking (REGT) is getting more attentions. Among state-of-the-art REGT methods, the ones which utilize four infrared (IR) lights have better accuracy and robustness to head movements. In this paper, a novel glint estimation method is proposed, which...
A channelizing broadband receiver for a spectrum analysis application that employs a bank of two-stage harmonic rejection mixers (HRMs) is described. Each HRM internally synthesizes a distinct downconversion LO. In addition to minimizing LO harmonic response, the HRMs also include a quadrature phase matching technique for enhancing image rejection. The technique reduces the two-dimensional calibration...
The Government of the Hong Kong Special Administrative Region Standards and Calibration Laboratory (SCL) has developed a simple calibration methodology for speed radar calibrators. The frequency shifted signal corresponding to the Doppler shifted signal measured by the radar system is received by a custom built antenna and measured by a spectrum analyzer. The expanded measurement uncertainty is 1...
The Government of the Hong Kong Special Administrative Region Standards and Calibration Laboratory (SCL) has developed a simple lumped LC model for the connector effects of coaxial air lines for frequencies up to 40 GHz. The accuracy of the model has been verified by comparison with simulation and measurement results and confirmed to be valid up to 40 GHz.
In this paper, we propose an algorithm using only two commodity webcams without calibration to detect distance between user and display by face detection. According to the experimental result, the correlation coefficient of distance and the reciprocal of disparity is up to 0.9984. Our proposed algorithm can provide user's depth information with high accuracy from calibration free stereo capture image...
This paper presents a new calibration theory for pulsed-RF large-signal measurement which relies on a new pulsed HPR and new pulsed power calibration besides the conventional relative linear calibration. The methodology used is based on the multiharmonic characterization of the RF pulser under pulsed-operation. The pulsed-RF calibration technique is facilitated by the fast switching and settling of...
As the sensing capacitances of the recent microaccelerometers become smaller, a precise calibration method is highly required to compensate for the input parasitic capacitance mismatch. This paper presents a sub-fF trimmable readout circuit for capacitive tri-axes microaccelerometer. A charge sensitive amplifier (CSA) with correlated double sampling (CDS) and digital to-equivalent capacitance converter...
This paper is to propose a model to service digital holograms that can display a holographic image by interacting with viewer. This model includes both the cases of computing CCGH computer-generated hologram) at the transmitting side or receiving side, which depends on the computational power of each side. Interacting with the viewer is assumed and can be implemented with a face tracking technique,...
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