A 1 V low voltage delta-sigma fractional-N frequency divider for multi-band (780/868/915 MHz and 2.4 GHz) WSN frequency synthesizers is presented. The frequency divider consists of a dual-modulus prescaler, a pulse-swallow counter and a delta-sigma modulator. The high-speed and low-voltage phase-switching dualmodulus prescaler is used in the frequency divider. Low threshold voltage transistors ...

This paper proposes a divider structure that combines a novel self-timed ring structure and a carry-propagation-free division algorithm. The self-timed ring structure enables the divider to compute at a speed comparable to that of previously designed dividers with less silicon area. By exploiting the carry-propagation-free division algorithm, we can achieve even better performance. We designed ...

This letter presents a current-shaping technique for static MOS current-mode logic (MCML) prescalers. Simply with two extra current-shaping capacitors the self-oscillating frequecy is increased. A current vector model is also presented to illustrate the principles. The prescaler with the current-shaping technique was fabricated in a 0.18μm CMOS technology with a reference classic one. The measu...

In this letter, a half-mode waveguide based on gap (GW) technology for rapid prototyping is explored. Two devices have been designed and measured demonstration purposes: power divider curved waveguide. Both are constructed from two noncontacting metal pieces. also follow the same design process. bottom piece, horizontally polarized groove GW (GGW) housed. The height of about half, which require...

An excitation technology of TE40 mode for substrate integrated waveguide (SIW) and its application in designing a slot antenna array is proposed. In order to excite the TE40 mode, a microstrip power divider and two coupling slots driven by microstrip lines in the longitudinal direction of SIW are designed to convert the electromagnetic field pattern from slot lines to SIW. The advantages of the...

Interactive web-based learning tools, such as engineering simulations, are becoming increasingly common. Universities find them cost-effective, and students find them convenient. Professors find web-based simulations effective to intuitively convey the complex cause-and-effect relationships that are central in engineering education. For example, moving a slider can be used to interactively see ...

This paper presents the design of CMOS operational transconductance amplifiers (OTAs) with very small transconductance (of order of nano ampere per volt), which uses in very low frequency continuous time filters. This design uses current division technique to reduce the transconductance of OTA. This design is simulated in SPICE tool using 0.25μm technology model file.