M Tech Dissertations

Permanent URI for this collectionhttp://ir.daiict.ac.in/handle/123456789/3

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Now showing 1 - 4 of 4
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    Design of a novel high linearity down conversion mixer for GSM band applications
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2012) Srinaga, Nikhil N.; Gupta, Sanjeev
    Double balanced Gilbert cell mixer (GCM) is the mostly used kind of mixer as it provides conversion gain and has port to port isolation. This mixer lacks in linearity and noise figure which are to be taken care in designing mixer. Linearity is important for mixer design, to get an undistorted signal at its output. Similarly noise figure of double balanced GCM is more due to more number of components and is to be decreased to add less noise to RF signal. To increase the linearity of mixer, necessary changes are to be done at transconductance stage. The linearity of the mixer proposed is increased, by making use of an additional capacitor in parallel to gate capacitance and derivative superposition method. Derivative superposition method needs more number of transistors at transconductance stage resulting in increase of parasitic capacitance, resulting in an increase of flicker noise from indirect mechanism. This flicker noise due to parasitic capacitance is reduced by placing a tuned inductor in parallel to it
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    ItemOpen Access
    Vehicle detection and tracking
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2009) Rao, K. Ramprasad; Joshi, Manjunath V.
    Real time trafficc monitoring is one of the most challenging problems in machine vision. This is one of the most sorted out research topic because of the wide spec-trum of promising applications in many areas such as smart surveillance, military applications, etc. We present a method of extracting moving targets from a real-time video stream. This approach detects and classifies vehicles in image sequences of trafficc scenes recorded by a stationary camera. Our method aims at segregating cars from non-cars and to track them through the video sequence. A classication criteria based on the features is applied to these targets to classify them into categories: cars and non-cars. Each vehicle can be described by its features. The template region is estimated by means of minimum distance approach with respect to centroid of the obtained blob of the target. Extraction of features from each frame ensures eefficiency of the tracking system.
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    Design issues in direct conversion receiver
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2009) Gupta, Amit Kumar; Gupta, Sanjeev
    The wireless system is being rapidly proliferated in our life. The growing of capacity in wireless communication requires a new type of wireless communication method which does not affect current work on circuits and systems that can operate on gigahertz wide signals will undoubtedly be the wave of the future as pressures to supply multimedia services over wireless continue to build. To achieve the goal of single receiver which can act on various different standards the Direct Conversion Receiver (DCR) is the most suitable architecture. The DCR has been known for quite long years. There are number of design issues related to the implementation of DCR. This thesis presents the issues which are related to design of Direct Conversion along with the design issues related to LNA design.
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    Design of multi-standard RF front end receiver using novel low IF topology
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2008) Pandit, Vivek Kumar; Gupta, Sanjeev
    This thesis presents the multi-standard receiver architecture and the corresponding RF front-end design supporting Bluetooth and IEEE 802.11a WLAN standards. To maximize the level of component share in the proposed multi-standard receiver, the corresponding standards is analyzed and applied to the proposed multi-standard receiver architecture. Low-IF architecture is chosen for both Bluetooth and IEEE 802.11a WLAN, respectively. The system specifications and the building block specifications is derived from the corresponding standards and verified by spreadsheet models taking into account of major design issues such as image-rejection, intercept points, noise figure and gain. The simulation results prove the validity of the system analysis and the proposed multi-standard receiver architecture.