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We designed simulated and optimized laterally diffused Si-MOSFET (LDMOS) transistors in Sentaurus TCAD software. By introducing excess interface charge density at the RESURF (reduced surface field) region, a power density 1.5 W/mm with a PAE (power added efficiency) of 45% at 3 GHz were obtained. The gain was 20.3 dB. These results show the enhancement in RF performance by introducing excess interface...
Study of radio-wave propagation into and through buildings has become important with the increase in the broadband mobile services. Currently ray tracing and ray launching techniques are used for modeling radio transmission but due to unavailability of detailed building databases, it is not possible to take into account all the edges and discontinuities in the buildings. To overcome this limitation...
This paper describes the design, development and testing of an X-band frequency synthesizer. The synthesizer consists of a voltage-controlled oscillator (VCO), a phase-locked loop (PLL) circuit and a reference oscillator. Commercially available components used in the design provide a low cost and short time to market solution. Typical output power of the synthesizer is +10 dBm. Loop filter is designed...
One of the critical blocks in OFDM based transmitter is its power amplifier and the design is aimed for high linearity with maximum power efficiency. This paper describes the design and fabrication of S-band solid state high power amplifier using GaAs power MESFET device for OFDM transmitters. The amplifier operates at center frequency of 2.3 GHz with a bandwidth of 200 MHz. The typical output power...
This paper presents a dual band LNA that can be switched between two bands (2.4 GHz & 5.2 GHz) for IEEE 802.1 la/b/g WLAN applications. The LNA is also tunable within each band and the tuning is incorporated by on-chip varactors. The test chip consists of two fully integrated narrow-band tunable LNAs along with SPDT switch. For power saving one LNA can be switched off. The technology process is...
Planar slotted waveguide antennas usually have their main-beam pointed perpendicular to the antenna aperture. While this arrangement is most practical and convenient from design point of view, it suffers a serious setback in that it offers large RCS in the direction of antenna main-beam. This paper presents the design and testing of an offset-beam antenna for low RCS applications. A linear traveling...
This article focuses on trace back unit of Viterbi algorithm for constraint length K = 7. Conventional trace back unit comprises of three types of memory operations: decision bits write, trace back read & decode read whereas the pre-trace back approach exploits the inherent parallelism between the decision bits write & decode traceback operation. This approach results in reduction in latency...
In this paper, characterization of waveguide slots in an FEM based EM analysis software has been discussed. Characterization has been done for longitudinal broad wall radiating slot and centered-inclined broad wall coupling slot. Using this characterization, a Ku band 8 times 8 planar array antenna has been designed with Elliot's design equations. Its performance was first checked in an FEM analysis...
The performance of conventional pulsed radars is limited by its "time-bandwidth" product. In order to get high range resolution, a narrow pulse is required to be transmitted. However, this reduces the average transmit power resulting into shorter detection range. To mitigate this limitation of "time-bandwidth" problem, pulse compression technique is used. Pulse compression technique...
The pulse input Class C power amplifier response of an enhanced version of a previously fabricated and tested SiC MESFET 11 are studied using a new technique to its physical model in TCAD. The device is simulated at 5% duty cycle pulse for Gain (dB), Power density (W/mm), power loss and power added efficiency (PAE %) at 500 MHz and 1 GHz. The results are then correlated to the device features in DC...
Universal Mobile Telecommunication System (UMTS) is a third generation mobile communication technology based on wideband CDMA (WCDMA) and can facilitate the users in much better way as compared to the second generation of mobile communication. UMTS is superior to second generation in terms of bandwidth efficiency, quality of service, speech quality, speed and capacity. At present, more than 60 countries...
The multidisciplinary field of smart antennas has become significantly important over the past two decades. In this paper constrained least mean square (CLMS) algorithm for narrowband adaptive beamforming has been derived. This algorithm is capable of efficiently adapting according to the environment and able to maintain the chosen frequency response in the look direction always while minimizing the...
The ever-growing demand of higher data rates is pushing the modern wireless communication systems towards millimeter wave frequency band (30-300 GHz). At these frequencies the available bandwidth is much larger, resulting into increased data rates. Thus, there is a growing demand of efficient antennas operating at these high frequencies. This paper deals with the design of linear and planar resonant...
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