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In this paper the design, simulation and measurement procedure of injection locked clock and data recovery(CDR) circuit is discussed. The non-idealities of the CDR circuit such as power supply noise and lock detection are modeled behaviorally using Verilog-A. The required CDR specifications can be extracted in a very short period of simulation time with the designed behavioral model. The designed...
A novel low-complexity RF front-end circuit for impulseradio ultra-wideband (IR-UWB) receiver based on non-coherent communication was presented. The RF front-end includes a wideband low noise amplifier (LNA), a correlator, an integrator and a comparator. The RF front-end circuit is implemented in a 0.18-μm CMOS technology, consuming 35.1 mW under 1.8V. The wideband input impedance matching of LNA...
For cognitive radio (CR), compressed sensing (CS) techniques have been utilized for spectrum sensing in order to alleviate the high signal acquisition costs in the wideband regime. However, the compressed spectrum reconstruction will fail owing to the non-sparsity of the spectrum when the primary (licensed) users (PU or LU) occupy most subchannels. In this paper we study the problem of detecting spectrum...
Wireless Body Area Network (WBAN) and Mobile Health(M-Health, namely e-health or wearable health) monitoring system have become more than just buzzwords in recent years. This paper reviews the state-of-art WBAN channel and addresses wireless communication chip design challenges for M-Health system. Current available wireless communication standards have been proved in the paper that they can hard...
In the cognitive radio systems, sensor nodes perform a backoff process as soon as the clear channel assessment (CCA) detects a busy channel. In doing so they may neglect the implicit information of the failed CCA detection and further cause the redundant sensing. The blind backoff process in the CSMA/CA will cause lower channel utilization. This paper proposes an enhanced carrier sensing algorithm...
Ring oscillators, as extensively used building blocks in today's mixed-signal system on chip (SoC), have to face with the situation that its jitter and phase noise performance are seriously deteriorated by on-chip digital switching supply noise. Theory of supply noise induced jitter has been presented. A comparative study of different kinds of architecture and multi-dimensional design considerations...
A novel 1.575 GHz CMOS common-mode replica compensated LC voltage-controlled oscillator with enhanced power supply rejection (PSR) is introduced for global position system (GPS) system-on chip application. In order to improve the PSR and reduce the power consumption, additional regulating circuit with feed forward and feedback amplifiers are implemented using transconductance stages with common-mode...
A broadband router with the Network Address Translation (NAT) technology is popular in the private networks. The compatibility with various access authentication mechanisms of public network is a key issue for achieving interconnects between public network and private network. This paper presents a compatible method for the broadband router to support various 802.1x authentication mechanisms. Adopting...
Applications of high power ultrasound span many industrial sectors, from healthcare, through sonochemistry, to ultrasonic cleaning. These applications depend on the dynamics of cavity cluster. This study was conducted to investigate the collapse of cavity cluster in high power ultrasound fields. The cloud cavitation was produced by a 20 kHz ultrasonic horn used for sonochemistry. The dynamics of cavity...
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