A 312 ps response‐time LDO with enhanced super source follower in 28 nm CMOS. Issue 16 (1st August 2016)

• Record Type: Journal Article
• Authors: Lu, Yan; Li, Cheng; Zhu, Yan; Huang, Mo; U, Seng‐Pan; Martins, Rui P.
• Is Part Of: Electronics letters. Volume 52:Issue 16(2016)
• Page Start: 1368
• Page End: 1370
• Publication Date: 2016-08-01
• Subjects: power supply circuits -- power integrated circuits -- performance evaluation -- integrated circuit noise -- integrated circuit design -- electric impedance -- transients -- buffer circuits -- voltage regulators -- CMOS analogue integrated circuits; response‐time LDO -- enhanced super source follower -- high quality fully integrated power supplies -- performance improvement -- noise‐sensitive building block -- UWB communication systems -- double buffers -- cascode flipped‐voltage‐follower topology -- cascode FVF topology -- dominant pole design -- power supply rejection -- voltage variation -- load transient -- E‐SSF -- output impedance reduction -- power transistor -- FVF‐based low dropout regulator -- worst‐case PSR -- transient response time -- CMOS process -- on‐chip capacitors -- size 28 nm -- voltage 1.0 V; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2016.1719
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : High quality fully integrated power supplies could notably improve the performances of the noise‐sensitive building block in the UWB communication systems. Double buffers are inserted into the cascode flipped‐voltage‐follower (FVF) topology to enable designing the dominant pole at the output node for better power supply rejection (PSR) and less voltage variation during load transient. An enhanced super source follower (E‐SSF) is proposed to further reduce the output impedance of the buffer that drives the power transistor. The FVF‐based low dropout regulator (LDO) with E‐SSF achieves a worst‐case PSR of −18.9 dB across the full spectrum and a transient response time of 312 ps. The proposed LDO is designed in a 28 nm CMOS process and consumes 100 μA quiescent current with 1.0 V input and 0.8 V output voltages. In total, 120 pF on‐chip capacitors are used for filtering.