the rapid scaling in modern cmos technology has motivated the researchers to design new analog-to-digital converter (adc) architectures that can properly work in lower supply voltage. an exchanging the data quantization procedure from the amplitude to the time domain, can be a promising alternative well adapt with the technology scaling. this paper is going to review the recent development in t...

this paper presents a comparative analysis between two current control strategies, constant source power and generalized fryze current, used in active power filter (apf) applications having three different modulation methods. the hysteresis band (hb) and first-order delta-sigma modulation (dsm) as well as the second-order dsm is applied. the power section of the active power filter is viewed as...

This work reviews the effect of parametric programming on visual performance, daylighting and shading in office buildings in Tehran-Iran and studies their influences that help not only to reduce the glare but also to promote useful daylight illuminance through promoting visual comfort. It starts by establishing a review of the effective parameters on visual comfort indices, glare indices, and d...

Bone-conducted ultrasound (BCU) can be experienced as sound even by the severely hearingimpaired. We have developed a novel hearing aid using BCU perception (BCU hearing aid: BCUHA) for the profoundly hearing-impaired. Results of evaluation tests suggested its practicability, however, there is room for improvement in terms of articulation. In the BCUHA, ultrasonic sinusoids with a frequency of ...

This paper considers the detection performance of a serial thresholding receiver for preceded bina~ GMSK signal with BT=O. 5. The conditional symbol (biij error probability of the GMSK signal with carrier phase and timing errors is derived and compared to that of unfiltered BPSK. It is shown that the GMSK signal has practically the same performance as the ideal BPSK signal in the absence of syn...

Performance characteristic of an Unmanned Air Vehicle (UAV) is investigated using a newly developed heuristic approach. Almost all flight phases of any air vehicle can be categorized into trim and maneuvering flights. In this paper, a new envelope called trim-ability envelope, is introduced and sketched within the conventional flight envelope for a small UAV. Optimal maneuverability of the inte...

due to the important role of subsurface drainage in managing the ground water level, there are many researches focused on finding a new and more economic way to develop subsurface drainage technologies. lack of proper drainage system in northern iran has caused huge implantation of rice and it is impossible to have second implantation in this region. one reason of insufficiency of current drain...

Non-constant envelope modulation schemes have become commonplace in cellular applications due to their higher spectral efficiency. Linear PAs driven by an RF transmitter are usually used to generate these signals faithfully at the expense of power efficiency. Separate processing of amplitude and phase information (e.g., EER or polar modulation) has been proposed [1] as a way of improving the sy...

The magnicon is a RF power source with circular beam deflection [1] invented in the 1980's at Budker INP. The first magnicon with the power of 2.6 MW and efficiency of 73% at 915 MHz was built and tested in the pulse of 30 μsec in 1985 [2]. The second magnicon was developed as a prototype RF source for a linear collider. In order to achieve power of more than 50 MW at 7 GHz, the tube was built ...