Browsing by Author "Lee, Yuan-Sheng"

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A 20-Gb/s, 2.4 pJ/bit, Fully Integrated Optical Receiver with a Baud-Rate Clock and Data Recovery
(2018-01-01)
Lee, Yuan-Sheng
;
Chen, Wei-Zen
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
A single chip optical receiver comprising of a font-end amplifier, a CDR, and a 1:4 demultiplexer is presented. Incorporating with an integrating type receiver front-end, a baud-rate CDR is proposed to achieve both high sensitivity and highly energy-efficient operation. Besides, a hybrid loop filter consisting of analog decimation and digital post processing is proposed for high speed operation with low power consumption. By applying a PRBS 2(31)-1 test pattern, the input sensitivity of the optical receiver is about -9.2 dBm for a BER of less than 10(-12) (with a PD responsivity of 0.53 A/W). The recovered data jitter at the demultiplexer output is about 1.74 ps (rms). Implemented in a TSMC 40 nm CMOS process, the core area of the receiver chip is only 0.09 mm(2). It demonstrates an energy efficiency of 2.4 pJ/bit for the entire receiver at 20 Gbps operation.
A 25-Gb/s, 2.1-pJ/bit, Fully Integrated Optical Receiver With a Baud-Rate Clock and Data Recovery
(2019-08-01)
Lee, Yuan-Sheng
;
Ho, Wei-Hsiang
;
Chen, Wei-Zen
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper presents the design of a single-chip, 25-Gb/s optical receiver comprising of a front-end amplifier, a clock and data recovery (CDR), and a 1:4 demultiplexer. Incorporating with an integrating-type receiver front end, a new baud-rate CDR is proposed to achieve both high sensitivity and highly energy-efficient operations. Compared to conventional 2x oversampling CDRs that require edge samples for timing adjustment, the baud rate CDR reduces the number of sampling phases by half to save both area and power consumption. In addition, a hybrid loop filter consisting of analog decimation and digital postprocessing is proposed. It greatly relaxes the speed requirement of an all-digital loop filter while keeping the flexibility of a programmable loop bandwidth. By applying a pseudo random bit sequence (PRBS) 231-1 test pattern and using a photo detector whose responsivity is 0.53 A/W, the input sensitivities of the optical receiver at 20 and 25 Gb/s operations are about -13.8 and -8.7 dBm respectively, for a bit error rate (BER) of less than 10(-12). The recovered data jitter at the demultiplexer output is about 1.7-ps rms. The measured jitter tolerance (JTOL) exceeds the mask defined by the IEEE 802.3ba standard. Implemented in a 40-nm CMOS process, the chip area is only 0.09 mm2. The energy efficiency of the entire receiver is 2.1 pJ/bit at 25-Gb/s operation.
A 25-Gb/s, 2.1-pJ/bit, Fully Integrated Optical Receiver With a Baud-Rate Clock and Data Recovery
(2019-08-01)
Lee, Yuan-Sheng
;
Ho, Wei-Hsiang
;
Chen, Wei-Zen
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper presents the design of a single-chip, 25-Gb/s optical receiver comprising of a front-end amplifier, a clock and data recovery (CDR), and a 1:4 demultiplexer. Incorporating with an integrating-type receiver front end, a new baud-rate CDR is proposed to achieve both high sensitivity and highly energy-efficient operations. Compared to conventional 2x oversampling CDRs that require edge samples for timing adjustment, the baud rate CDR reduces the number of sampling phases by half to save both area and power consumption. In addition, a hybrid loop filter consisting of analog decimation and digital postprocessing is proposed. It greatly relaxes the speed requirement of an all-digital loop filter while keeping the flexibility of a programmable loop bandwidth. By applying a pseudo random bit sequence (PRBS) 2(31)-1 test pattern and using a photo detector whose responsivity is 0.53 A/W, the input sensitivities of the optical receiver at 20 and 25 Gb/s operations are about -13.8 and -8.7 dBm respectively, for a bit error rate (BER) of less than 10(-12). The recovered data jitter at the demultiplexer output is about 1.7-ps rms. The measured jitter tolerance (JTOL) exceeds the mask defined by the IEEE 802.3ba standard. Implemented in a 40-nm CMOS process, the chip area is only 0.09 mm(2). The energy efficiency of the entire receiver is 2.1 pJ/bit at 25-Gb/s operation.