A continuous-time /spl Sigma//spl Delta/ ADC with increased immunity to interferers

Abstract

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A low-power highly digitized receiver for 2.4-GHz-band GFSK applications

“…Therefore, one filter notch has been placed at the edge of the image band from 1 MHz to 0 Hz; the remaining four notches being placed in the wanted signal band from 0 to 1 MHz [8]. A detailed discussion on interferer immunity of continuous-time ADCs and further improvements thereof can be found in [9].…”

Design of Continuous-Time Σ∆ Modulators with Sine-Shaped Feedback DACs

“…The presence of the e −t d s term in the H DAC transfer function will require the use of the modified-z-transform technique [6] to solve equation (1). While avoiding the complex mathematics necessary to perform time-domain convolution, this technique enables us to get the z-transform of signals having variations between two sampling instants.…”

“…Intrinsic anti-aliasing filter, lower thermal noise and higher sampling rate make these modulators more suitable for low-power or high-speed applications and commonly used for analog to digital conversion in radio receivers [1].…”

Filtering adjacent channel blockers using signal-transfer-function of continuous-time ΣΔ modulators

“…In this work, we show than in addition to anti-aliasing filtering, the signal-transfer-function (STF) of CT Σ∆ can be used to significantly attenuate adjacent channel blockers in telecommunication applications. This characteristic has already been discussed in [2], [7] but rarely used [8] due to the choice of unsuitable CT Σ∆ architectures. In [8] the architecture is modified to improve the filtering behavior but the same thing may be done with simple CT Σ∆ architectures as shown in this paper.…”

“…This characteristic has already been discussed in [2], [7] but rarely used [8] due to the choice of unsuitable CT Σ∆ architectures. In [8] the architecture is modified to improve the filtering behavior but the same thing may be done with simple CT Σ∆ architectures as shown in this paper.…”