A 26-Gb/s 3-D-integrated silicon photonic receiver in bicmos-55 nm and pic25g with-15.2-dbm oma sensitivity

This letter presents a 3-D-integrated 26 Gb/s opto-electrical receiver front-end. The electronic integrated circuit (EIC) is fabricated in a BiCMOS-55-nm technology, flipped and placed on top of the photonic integrated circuits (PICs) die through copper pillars. In the receiver chain, a fully differential shunt-feedback TI amplifier (FD-SF TIA) is followed by a limiting amplifiers (LAs) with embedded equalization, output driver and an automatic offset cancelation loop. The whole receiver provides a transimpedance (TI) gain of 76 dB Ω with 30-GHz bandwidth. By exploiting the FD-SF TIA with low parasitic capacitance of the Germanium dual heterojunction photo diode (Ge-PD) in the photonic die, the receiver achieves sensitivity of-15.2 dBm optical modulation amplitude (OMA) at Ge-PD and-10-dBm OMA at the single-mode fiber (SMF) optical output with bit error rate of 10-12 and PRBS 15. The sensitivity is aligned with state-of-the-art receivers employing discrete photonics and, to author's best knowledge, it is the lowest reported among published 25 Gb/s receivers exploiting silicon photonics

A 26-Gb/s 3-D-Integrated Silicon Photonic Receiver in BiCMOS-55 nm and PIC25G with - 15.2-dBm OMA Sensitivity

This letter presents a 3-D-integrated 26 Gb/s opto-electrical receiver front-end. The electronic integrated circuit (EIC) is fabricated in a BiCMOS-55-nm technology,flipped and placed on top of the photonic integrated circuits (PICs) die through copper pillars. In the receiver chain,a fully differential shunt-feedback TI amplifier (FD-SF TIA) is followed by a limiting amplifiers (LAs) with embedded equalization,output driver and an automatic offset cancelation loop. The whole receiver provides a transimpedance (TI) gain of 76 dBñ with 30-GHz bandwidth. By exploiting the FD-SF TIA with low parasitic capacitance of the Germanium dual heterojunction photo diode (Ge-PD) in the photonic die,the receiver achieves sensitivity of -15.2 dBm optical modulation amplitude (OMA) at Ge-PD and -10-dBm OMA at the single-mode fiber (SMF) optical output with bit error rate of 10-12 and PRBS 15. The sensitivity is aligned with state-of-the-art receivers employing discrete photonics and,to author's best knowledge,it is the lowest reported among published 25 Gb/s receivers exploiting silicon photonics

A 3.5 GHz Wideband ADPLL With Fractional Spur Suppression Through TDC Dithering and Feedforward Compensation

Nonlinearities in the time-to-digital converter (TDC) are a significant source of fractional spurs in a divider-less fractional-N ADPLL. Using an abstract model for the TDC, this paper presents a dithering method which is mathematically shown to suppress fractional tones, in conjunction with a feedforward dither cancellation technique which suppresses dither-induced phase noise. A mostly-digital calibration algorithm is also presented which ensures consistent phase noise cancellation across PVT conditions. The aforementioned techniques are implemented in a 65 nm digital CMOS prototype running at 3.5 GHz from a 35 MHz reference. The ADPLL demonstrates - 101 dBc/Hz in-band phase noise at a bandwidth of 3.4 MHz, - 58 dBc worst fractional spurious performance across the entire fractional range, and consumes 8.7 mW from a 1.2 V suppl

Handedness-Dependent Brain Networks Re-organization During Visuo-Motor Task Execution

The aim of the present study was to investigate handedness-dependent organization and functioning of brain networks during visuomotor integration processes. Specifically, a connectivity study was conducted on EEG traces acquired on a group of healthy volunteers during a resting (baseline) condition and the execution of a visuomotor task with the dominant and non-dominant hands. Our results showed that an enhanced network reorganization is observed in the mu band during the movement performed with the right hand with respect to the baseline condition. Conversely, more evident reorganization was observed for the movement performed with the non-dominant hand when dealing with the beta band. These results suggest that different brain functional reorganization strategies are used to accomplish motor tasks with the two body sides. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG