Figure 12: a) High-level block diagram of the segmented quantizer; b) quantization block details; c) signal processing model .. Figure 16: Estimated power spectra of a) the quantization noise sequences, and b) the running sums of the quantization noise sequences of the first-order ∆Σ modulator and the segmented quantizer presented in Section IV before and Ian Galton supervised the research whic...

In this paper we present a new circuit design for a 2.4GHz CMOS direct conversion mixer incorporating adaptive offset cancellation. The basic circuit structure is that of a Gilbert cell mixer. Offsets are cancelled by dynamically varying the bias on the loads, which are designed to provide constant impedance independent of the load cancellation current. The bias control is regulated via an adap...

Thermal noise and 1/f noise are known to exist in carbon composition (CC) and thick film (TF) resistors. A circuit involving a differential instrumentation op-amp was used to measure the noise of a resistor under test. The noise spectra of these resistors were measured using a dynamic signal analyzer that performs an auto-correlation Fourier transform from the time domain to the frequency domai...

Noise artifacts are one of the key obstacles in applying continuous monitoring and conrputer-assisted analysis of lung sounds. Traditional adaptive noise cancellation (ANC) methodologies work reasonably well when signal and noise are stationary and independent. Clinical lung sound auscultation encounters an acoustic environment in which breath sounds are not stationary and often correlate with ...

Except where reference is made to the work of others, the work described in this thesis is my own or was done in collaboration with my advisor. This thesis does not include proprietary or classified information. Permission is granted to Auburn University to make copies of this thesis at its discretion, upon the request of individuals or institutions and at their expense. The author reserves all...

An X-tolerant multiple-input signature register (MISR) compaction methodology that compacts output streams containing unknown (X) values, called X-canceling, is an alternative to masking X values (i.e., X-masking). A number of control bits that is linear in the number of X’s to be canceled are required to perform the X-canceling operation for existing X-canceling approaches. This paper proposes...

A wideband and low-power RF-to-baseband (BB) current-reuse receiver (CRR) front-end is proposed, its performance verified using two matching networks, one with an LC balun on-chip biasing inductor, CRR1, another a differential without CRR2, requiring less area. The transimpedance amplifier (TIA) low-noise transconductance (LNTA) share the bias current from single supply to reduce power consumpt...

A space-time processing scheme is proposed for TDMA based cellular/PCS communications that cancels co-channel interference while simultaneously equalizing the desired signal. This is achieved through processing of a training signal designed from a PN code. At the receiver, the symbol waveform is built up above the noise and interference through correlation with a sampled waveform designed to ex...