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- Title
A 4 GHz Single-to-Differential Cross-Coupled Variable-Gain Transimpedance Amplifier for Optical Communication.
- Authors
Lee, Samuel B. S.; Yeo, Kiat Seng
- Abstract
This letter presents an inductorless transimpedance amplifier (TIA) for visible light communication, using the UMC 40 nm CMOS process. It consists of a single-to-differential input stage with a modified cross-coupled regulated cascode design, followed by a modified f T -doubler mid-stage with a combined active inductor and capacitive degeneration design for bandwidth-enhancement and differential output. The mid-stage also has an attached common-mode feedback (CMFB) circuit. Both the input and mid-stages have gain-varying and peaking-varying functions. It has a measured gain range of 37.5–58.7 dBΩ and 4.15 GHz bandwidth using a 0.5 pF capacitive load. The gain range results in an input dynamic range of 33.2 µA–1.46 mA. Its input referred noise current is 10.7 pA/ H z , core DC power consumption is 7.84 mW from a V D D T I A of 1.6 V and core area is 39 µm × 26 µm.
- Subjects
OPTICAL amplifiers; OPTICAL communications; COMPLEMENTARY metal oxide semiconductors; VISIBLE spectra; OPTICAL receivers; SOCIAL degeneration
- Publication
Electronics (2079-9292), 2021, Vol 10, Issue 23, p3042
- ISSN
2079-9292
- Publication type
Article
- DOI
10.3390/electronics10233042