ADC based on a fully differential current mode integrator

Handkiewicz, Andrzej; Kropidłowski, Marek; Szczęsny, Szymon; Naumowicz, Mariusz

doi:10.1007/s10470-019-01456-4

Cited by 2 publications

(1 citation statement)

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“…This allowed us to avoid calculations for real converters in ELDO simulator and, as a result, significantly accelerate synthesis filter optimization. Practical implementation of such sub-ADCs in standard CMOS technology, using continuous time integrators in current mode, has been presented in the paper [11].…”

Section: Design Methods Of the Synthesis Multiport Filtermentioning

confidence: 99%

NANO-studio, the design environment of filter banks implemented in standard CMOS technology

Handkiewicz¹,

Naumowicz

2021

Analog Integr Circ Sig Process

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The paper presents a method of optimizing frequency characteristics of filter banks in terms of their implementation in digital CMOS technologies in nanoscale. Usability of such filters is demonstrated by frequency-interleaved (FI) analog-to-digital converters (ADC). An analysis filter present in these converters was designed in switched-current technique. However, due to huge technological pitch of standard digital CMOS process in nanoscale, its characteristics substantially deviate from the required ones. NANO-studio environment presented in the paper allows adjustment, with transistor channel sizes as optimization parameters. The same environment is used at designing a digital synthesis filter, whereas optimization parameters are input and output conductances, gyration transconductances and capacitances of a prototype circuit. Transition between analog s and digital z domains is done by means of bilinear transformation. Assuming a lossless gyrator-capacitor (gC) multiport network as a prototype circuit, both for analysis and synthesis filter banks in FI ADC, is an implementation of the strategy to design filters with low sensitivity to parameter changes. An additional advantage is designing the synthesis filter as stable infinite impulse response (IIR) instead of commonly used finite impulse response (FIR) filters. It provides several dozen-fold saving in the number of applied multipliers.. The analysis and synthesis filters in FI ADC are implemented as filter pairs. An additional example of three-filter bank demonstrates versatility of NANO-studio software.

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Section: Design Methods Of the Synthesis Multiport Filtermentioning

confidence: 99%