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The paper presents a continuous-time (CT) Delta-Sigma (ΔΣ) analog-to-digital converter (ADC) using a current output digital-to-analog converter (DAC) for the feedback. From circuit analysis it is shown that using a current output DAC makes it possible to relax the noise requirements of the 1st integrator of the loopfilter, and thereby reduce the current consumption. Furthermore, the noise of the current...
An investigation of an amplifier with discrete time Automatic Gain Control (AGC) which is intended for implementation in hearing aid is performed. The aim of this investigation is to find the AGC's minimum gain step size for which the glitches become inaudible. Such AGCs produce undesirable glitches at the output turning into audible sound effects. In order to find this minimum gain step size both...
This paper presents a new optimization method for achieving a minimum current consumption in a continuous-time Delta-Sigma analog-to-digital converter (ADC). The method is applied to a continuous-time modulator realised with active-RC integrators and with a folded-cascode operational transconductance amplifier (OTA). Based on a detailed circuit analysis of the integrator and the OTA, key expression...
An adaptive analog-to-digital conversion channel for audio, using automatic gain control, generates transient errors that may be audible. Evaluating the audibility of such errors requires subjective evaluation using listening tests. From an electrical circuit design point-of-view this is not feasible, due to design time constraints. This paper investigates the use of the model output variables (MOVs)...
One of the challenges in teaching integrated analog electronics is that it is difficult to offer courses where the students can design, layout and tape-out a circuit and subsequently perform measurements on the device due to the long turn-around time in IC fabrication. In this paper it is described how the sequences of courses in integrated analog electronics at the Technical University of Denmark...
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