Linearization of Synthesizable VCO-Based ADCs Using Delta Modulation
2015 (English)In: 2015 EUROPEAN CONFERENCE ON CIRCUIT THEORY AND DESIGN (ECCTD), IEEE , 2015, 280-283 p.Conference paper (Refereed)
VCO-based ADC is an attractive candidate for the synthesis of all-digital ADCs using standard cells. However, the non-linearity of a synthesizable VCO requires digital post-processing to obtain good performance. We propose another solution where the input analog signal is pre-coded into a delta-modulated pulse stream which is used to drive a VCO-based converter. This causes the oscillator to operate at two distinct frequencies thereby eliminating the VCO non-linearity from the converter transfer function. A circuit is proposed that consists of a synthesized digital block realizing all the active parts of the circuit and a passive RC net used as an integrator. Spectre simulation of the netlist synthesized using a 65 nm standard cell library shows a performance of 8.2 bit ENOB over a 3 MHz bandwidth without using any digital post-processing.
Place, publisher, year, edition, pages
IEEE , 2015. 280-283 p.
Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:liu:diva-131533DOI: 10.1109/ECCTD.2015.7300003ISI: 000380498200005ISBN: 978-1-4799-9877-7OAI: oai:DiVA.org:liu-131533DiVA: diva2:974177
European Conference on Circuit Theory and Design (ECCTD)