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Differential static polarizability and black body radiation (BBR) shift for Ytterbium ion (171Yb+) clock transition from ground state 2S1/2 to metastable state 2D3/2 corresponding to the wavelength 435.5 nm are calculated accurately for frequency standard applications. The values are found to be −7.5(5) × 10−40 Jm2/V and −0.4(1) Hz, respectively, which are well in agreement with pre-available data...
We are developing the first optical frequency standard in India with single ytterbium ion (171Yb+), which is confined and laser cooled in an ion trap. This precision clock experiment needs to be automated for running it reliably and continuously over few days. For this we are developing a computer control systems. Some of its supporting hardware modules have already been designed and tested. In this...
In this paper, a CMOS ultra-wideband (UWB) pulse generator is designed in IBM 90 nm technology for on-chip wireless interconnect applications. A UWB pulse is generated using the triangular pulse generation technique. The output pulse is OOK modulated according to data and each data bit is preceded by a reference pulse. A maximum data rate of 2.5 Gb/s with transmitted reference is achieved when the...
Passive RFID application is often used in back scatter mode where a weak reflected signal is relied upon by reader systems. This limits the application of the technology as the reader and tag distance is constrained. This paper presents a passive design where planar capacitors are used to locally store charges to power a tag based on newer CMOS technology. In this paper BSIM4 transistor model based...
With operating frequencies in GHz regime, problems associated with digital systems in terms of clock skew, jitter, power consumption, bit error rate (BER), and signal integrity are becoming critical in on-chip/off-chip clock distribution networks using conventional copper interconnect technology, which has emerged as a performance limiter for current and future VLSI circuits. In order to mitigate...
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