A 64-Gb/s PAM-4 Optical Receiver With Amplitude/Phase Correction and Threshold Voltage/Data Level Calibration
| Autor: | Kuan-Lin Fu, Shen-Iuan Liu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Transimpedance amplifier
Physics Variable-gain amplifier business.industry 02 engineering and technology Voltage regulator 020202 computer hardware & architecture law.invention Threshold voltage Intersymbol interference Amplitude Optics Hardware and Architecture Pulse-amplitude modulation law 0202 electrical engineering electronic engineering information engineering Operational amplifier Electrical and Electronic Engineering business Software |
| Zdroj: | IEEE Transactions on Very Large Scale Integration (VLSI) Systems. 28:1726-1735 |
| ISSN: | 1557-9999 1063-8210 |
| DOI: | 10.1109/tvlsi.2020.2991721 |
| Popis: | We present a 64-Gb/s four-level pulse amplitude modulation (PAM-4) optical receiver with the amplitude/phase correction and the threshold voltage/data level calibration, utilizing an inverter-based transimpedance amplifier (TIA). A variable gain amplifier (VGA) with the amplitude/phase correction is also presented. The threshold voltage of the data slicers and the data levels for the error slicers are calibrated. A three-tap decision feedback equalizer is utilized to compensate for the intersymbol interference. The tap coefficients are calibrated by using the sign-sign least-mean-square algorithm. This PAM-4 optical receiver is fabricated in a 40-nm CMOS process. For the TIA with five VGAs, the measured maximum amplitude imbalance is less than 0.4 dB and the phase imbalance is less than ±1°. Its power is 420 mW from a supply of 1.1 V excluding the output buffers. Its core area is 2.2 mm2. |
| Databáze: | OpenAIRE |
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