A fully-differential, flipped-voltage-follower-based (FVF) transimpedance design for optical receivers with large-area photodetectors


Gungordu A. D. , Comertoglu I., Yelten M. B.

ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING, vol.113, no.2, pp.241-248, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 113 Issue: 2
  • Publication Date: 2022
  • Doi Number: 10.1007/s10470-022-02100-4
  • Journal Name: ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Applied Science & Technology Source, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, DIALNET, Civil Engineering Abstracts
  • Page Numbers: pp.241-248
  • Keywords: Transimpedance amplifier, Current-mode circuits, Photodetectors, Plastic-optical-fiber communications, Current feedback, Flipped-voltage-follower, AMPLIFIER
  • Istanbul Technical University Affiliated: Yes

Abstract

This article presents a transimpedance amplifier (TIA) design suitable for 1 Gbps operation using a 4-level pulse amplitude modulation scheme. It is aimed toward communication protocols with large-area photodetectors, such as plastic-optical-fiber, visible light communications, and biomedical applications. The TIA leverages a flipped-voltage-follower as well as global current feedback to extend the bandwidth of the TIA and operates up to 400 MHz with a very low static power while driving a very large capacitance. The TIA has a static power consumption of only 1.2 mW at a 1 V supply voltage. Additionally, the fully-differential version of the proposed TIA is introduced in the case of using spatially-modulated light detectors. The design is validated with post-layout simulations employing a commercially available 40 nm CMOS process. Mismatch and corner simulations demonstrate that the proposed TIA can still provide the specifications in the worst-case scenarios.