Regenerative comparator with floating capacitor for energy‐harvesting applications. Issue 8 (22nd April 2021)

• Record Type: Journal Article
• Authors: Pahlavanzadeh, Hadi; Karami, Mohammad Azim
• Is Part Of: IET circuits, devices & systems. Volume 15:Issue 8(2021)
• Page Start: 842
• Page End: 851
• Publication Date: 2021-04-22
• Subjects: Electronic circuits -- Periodicals; Electronic systems -- Periodicals; 621.381505
• DOI: 10.1049/cds2.12073
• Languages: English
• ISSNs: 1751-858X

Abstract

Abstract: An energy‐efficient regenerative comparator design is unveiled. A floating capacitor is utilized to protect the complete discharge of the preamplifier output nodes by NMOS input transistors. The introduced floating capacitor is flipped around the preamplifier to allow PMOS cross‐couple transistor charge reutilization and elevate amplification gain at the integration phase. By increasing amplification gain, the input common mode voltage of the NMOS latch that is toggled within some delay is increased, too. Therefore, the latch stage is activated strongly, and regeneration delay is reduced. Simulation results corroborate that the proposed technique reduces power consumption and input‐referred offset by more than 60% compared with results of similar previous works. Furthermore, the referred noise and delay are improved more than 30%.