This article describes refinements to an instrument for determining the viscoelastic properties of a solid material isothermally, with a single apparatus, over 10 decades of time and frequency. Torque is applied electromagnetically to a specimen fixed at one end. Specimen deformation is determined via a laser beam reflected from the other end upon a split diode detector. Phase resolution is imp...

1 Gbps full-duplex optical links for 6.25 GHz ultra dense WDM frequency slots are demonstrated and optimized for cost-effective metro-access networks. The OLT-ONU downlinks are based on 1 Gbps Nyquist-DPSK using MZM and single-detector heterodyne reception obtaining a sensitivity of -52 dBm. The ONU-OLT uplinks are based on 1 Gbps NRZ-DPSK by directly phase modulated DFB and also single-detecto...

Article history: Received 27 August 2014 Received in revised form 24 March 2015 Accepted 29 March 2015 Available online 3 April 2015

The All Digital Phase Locked Loop consists of full digital components which are used in advanced communication systems like frequency synthesizer, Carrier and clock recovery, modulator/demodulator etc. Hence the performance analysis of ADPLL becomes very necessary when designing these equipments. The ADPLL contains phase detector, loop filter and Digital controlled oscillator. The performance o...

Recent work with autonomous modal parameter estimation has shown great promise in the quality of the modal parameter estimation results when compared to results from experienced user interaction using traditional methods. Current research with the Common Statistical Subspace Autonomous Mode Identification (CSSAMI) procedure involves the integration of multiple modal parameter estimation algorit...

approved: _____________________________________________________ Un-Ku Moon Kartikeya Mayaram Digital phase-locked loops (PLLs) have been receiving increasing attention recently due to their ease of integration, scalability and performance comparable to their analog counterparts. In digital PLLs, increased resolution in time-to-digital conversion is desirable for improved noise performance. This...

single tap actually consists or four diodes distributed at 2 pS effective delay time along the line and tied together at the tap output. Fig. 2 shows the evolutio.n or the coincidence or two input pulses. The peak detector taps are biased such that neither the clock nor the trigger signal alone is large enough in amplitude to cause forward bias or the peak detector taps. This is the case at tim...

To solve the problems of the major kinds of microwave radars to meet the ranging needs of vibrating constructions, a new type of radar system for ranging is proposed based on the carrier modulation and heterodyne phase difference detecting with time-to-digital converter (TDC). In the radar system, an intermediate frequency (IF) signal is used to modulate the amplitude of radio frequency (RF) ca...