Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 21 for “"Automatic Gain Control"”.
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Automatic gain control of transistor amplifiers
… treats Just such a design, that of obtaining automatic gain control of a transistor amplifier. There has been as yet little published about this difficult problem, and much of the work here presented is believed to be original*
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Automatic gain control for a small portable ultrasound device
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2001.
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An implementation of an AMPS digital base station with adaptive Automatic Gain Control
… uniform and symmetric quantizer, optimal gain factors are computed for uniformly-, sinusoidally- and normally-distributed input signals. These gain factors maximize the quantizer's Signal-to-Quantization Noise Ratio (SQNR) in a mean-square sense. Together, these techniques can be used to …
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An adaptive antenna integrated with automatic gain control for a receiver front end
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Chopper stabilization in analog multipliers
… many systems such as filters, neural networks, automatic gain control circuits, and phase alignment systems. As with any circuit, analog multipliers are plagued by DC offsets. When considering techniques for removing this offset, the question of continuous regulation versus calibration arises. …
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A new approach to dynamic range enhancement
… techniques. The DRET has several advantages over automatic gain control (AGC) including stability and the absence of parasitic modulation on weak signals caused by fading or transient high power signals.
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A low-power cochlear implant system
… in speech or noise. This work describes an automatic gain control (AGC) design which uses programmable hybrid analog-digital current-mode feedback to implement a dual-loop strategy, a well-known algorithm for speech in noisy environments. The AGC exhibits level-invariant. stability, …
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Reflection seismic data acquisition and processing for enhanced interpretation of high resolution objectives
… using Vibroseis whitening (VSW) and stretched automatic gain control (SAGC). A zero-phase wavelet-shaping filter was used to optimize the waveform length allowing a thinner depositional sequence to be resolved. The high resolution data acquisition and processing led to an interpreted section …
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2GHz W-CDMA Radio Transceiver
… transmitter in conjunction with transmit power control (TPC), two independent receivers in conjunction with automatic gain control (AGC) and automatic frequency control (AFC), and one common synthesizer. Data exchange between the radio and the baseband processor takes place in an 8-bit digital …
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An investigation into the performance of a power-of-two coefficient transversal equalizer in a 34Mbit/s QPSK digital radio during frequency-selective fading conditions
… in the received bandwidth may be unaffected, the Automatic Gain Control is not able to correct for this distortion, and so other methods are required. The dissertation commences with a summary of the phenomenon of multipath as this provides the context for the investigations which follow. The …
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Analysis and Dynamic Range Enhancement of the Analog-to-Digital Interface in Multimode Radio Receivers
… Included in this analysis is the design of automatic gain control (AGC) for narrowband and IS-95 spread spectrum systems to optimize quantization noise and distortion due to A/D overload. Lastly, methods for improving the dynamic range of the analog-to-digital interface such as nonuniform …
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Evaluation of different forms of compression in digital hearing aids
… noise. Four combinations of the Dual Front-End automatic gain control (AGC) system were implemented: (1) The Dual Front-End with a Hold Timer developed in Stone et al. [8], which aimed at reducing pumping effects while maintaining a relatively fast release; (2) The Dual Front-End with the SNR …
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Development and Testing of A Space-borne GPS Signal Strength Sensor
… obtained to calculate the signal strength. The gain variation of the automatic gain control (AGC) in the GPS signal link is considered, and a model is designed and implemented in data post-processing to reduce the AGC distortion to GPS signal strength measurements. Speed limitation of 1,000 …
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Single Phase Power Factor Correction Circuit with Wide Output Voltage Range
… efficiency from light load to heavy load. The control system of the variable output PFC circuit is analyzed and designed. Charge average current sensing scheme has been adopted to sense the input current. The problem of high input harmonic currents at low output voltage is discussed. It is …
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Efficient narrow-band speech transmission over land mobile channels.
… improves the speech quality. An appropriate Automatic Gain Control (AGC) system compensates for the amplitude fluctuations attributed to multipath fading. The tracking range of the AGC is programmable and can take any value according to the signal to noise ratio encountered. Finally, the …
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Implementing IS-95, the CDMA standard, on TMS320C6201 DSP
… Maximal Ratio Combining, Deinterleaver, Digital Automatic Gain Control, and Viterbi Decoder. The entire demodulation process is done completely in C. That makes it a very attractive alternative implementation in the future applications. It is well known that ASIC design is not only expensive and …
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Cognitive RF Front-end Control
… first concept is called cognitive RF front-end control (CogRF). CogRF operates by cognitively controlling the local-oscillator and sampling frequencies in receivers. This research shows that CogRF can fulfil the objective of pre-selectors by minimizing the effects of weak and moderately-powered …
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Design and Implementation of a Pilot Signal Scanning Receiver for CDMA Personal Communication Services Systems
… at its input. This necessitated the design of an automatic gain control (AGC) mechanism, which is digitally implemented in this receiver. Simulation studies were undertaken to assist in the design and implementation of the pilot signal scanning receiver. These simulations were used to quantify how …
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The use of fractal dimension for texture-based enhancement of aeromagnetic data.
… vertical and total horizontal derivatives, and automatic gain control). Most of the FD estimation techniques enhanced similar features to each other. However, the 2D methods generally produced clearer results than their associated 1D methods. In contrast to this result, application of the …
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Receivers for energy efficient optical interconnects
… rates. Duobinary sampling leverages the well-controlled TIA ISI to recover the transmitted data, making it much more hardware efficient than canceling the ISI using a DFE. Fabricated in a 65-nm CMOS process, the prototype receiver achieves optical modulation amplitude (OMA) sensitivity of …
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