A 6-Bit 340 Msps BiCMOS ADC of 1.8 V Single Power Supply Adopting Folding Logic


IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.8   pp.1546-1553
Publication Date: 2002/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Performance Analog Integrated Circuits)
ADC,  flash,  low voltage,  BiCMOS,  folding logic,  

Full Text: PDF>>
Buy this Article

We have developed a 6-bit flash ADC powered from a single 1.8 V supply, using a bipolar based BiCMOS process. Measurements revealed that it operates up to 340 Msps at 1.26 V power supply consuming 36 mW. The conversion rate per power performance index of 9.4 Msps/mW is the highest in the fast 6-bit ADCs reported to date. To operate at this low supply voltage, a new encoder scheme, together with the unique layout, was devised which also substantially improved sparkle error rate. The encoder circuits was synthesized in a new logic topology that we named "folding logic. " This new logic topology is not only suitable for low-voltage operation but also intrinsically fast.