Sang-Hyeok Chu, W. Bae, Gyu-Seob Jeong, Jiho Joo, Gyungock Kim, D. Jeong
{"title":"A 26.5 Gb/s optical receiver with all-digital clock and data recovery in 65nm CMOS process","authors":"Sang-Hyeok Chu, W. Bae, Gyu-Seob Jeong, Jiho Joo, Gyungock Kim, D. Jeong","doi":"10.1109/ASSCC.2014.7008870","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008870","url":null,"abstract":"This paper presents a 26.5 Gb/s optical receiver with an all-digital CDR (ADCDR) fabricated in a 65 nm CMOS process. The receiver consists of a transimpedance amplifier (TIA), a limiting amplifier (LA), and a half-rate ADCDR. The TIA and LA are based on an inverter-based amplifier for low power consumption. The ADCDR adopts an LC quadrature digitally controlled oscillator (LC-QDCO) for the quadrature sampling. The recovered clock jitter is 1.28 psrms and the measured jitter tolerance exceeds the tolerance mask specified in IEEE 802.3ba. The receiver sensitivity is measured to be -9 dBm and -6.6 dBm for the data rate of 25 Gb/s and 26.5 Gb/s, respectively. The whole receiver chip occupies an active area of 0.75 mm2 and consumes 254 mW at the data rate of 26.5 Gb/s.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131243516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A 4.5 to 13 times energy-efficient embedded microprocessor with mainly-static/partially-dynamic reconfigurable array accelerator","authors":"Itaru Hida, Dahoo Kim, T. Asai, M. Motomura","doi":"10.1109/ASSCC.2014.7008854","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008854","url":null,"abstract":"Conventional processors are energy in-efficient in that they fail to utilize the fact that most of their time and energy are spent on heavily-recursively executed small code segments. A DYNaSTA accelerator, proposed and implemented, is an architectural solution to such a problem. It is an reconfigurable array accelerator featuring an hybrid architecture: only a limited portion is reconfigured dynamically (i.e., frequently) while the rest is reconfigured statically (i.e., only occasionally). This way, the DYNaSTA accelerator tries to achieve both flexibility and energy-efficiency at the same time. Results of power simulation and fabricated chip measurements have been quite encouraging: 4.5 to 13 times energy efficiency will be made possible by this accelerator when compared with a conventional embedded microprocessor.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128866395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A 2 × 20-Gb/s, 1.2-pJ/bit, time-interleaved optical receiver in 40-nm CMOS","authors":"Shih-Hao Huang, Zheng-Hao Hong, Wei-Zen Chen","doi":"10.1109/ASSCC.2014.7008869","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008869","url":null,"abstract":"This paper describes a single-chip, 2 × 20-Gb/s time-interleaved integrating-type optical receiver. Combining with correlation-based timing recovery and 1:4 demultiplexer, it achieves a high energy efficiency of 1.2-pJ/bit. By incorporating the proposed alternating photodetector (ALPD) current-sensing scheme, the front-end receiver is 4-way time-interleaved to increase input sensitivity and relax operating speed of digital comparator. The optical receiver achieves an input sensitivity of 44 μApp at bit-error-rate of less than 10-12. Fabricated in a 40-nm bulk CMOS technology, the chip size is 0.46 mm2.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133737256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A power efficient frequency shaping neural recorder with automatic bandwidth adjustment","authors":"Jian Xu, Tong Wu, Zhi Yang","doi":"10.1109/ASSCC.2014.7008894","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008894","url":null,"abstract":"This paper presents a frequency-shaping (FS) neural recorder with automatic bandwidth adjustment. The proposed recorder inherently attenuates electrode offset and motion artifacts, compresses neural data dynamic range by 4.5-bit, and achieves a 3 pF input impedance to better support chronic recording experiments. A major drawback of an FS recorder is larger input referred noise due to noise aliasing and reduced gain at low frequencies. In this work, we have proposed a multi-phase sampling and processing technique which can 10 times reduce the noise. In addition, a neural spike processor operating at a low duty cycle has been integrated, where the processing results are feedback to the analog frontend: when the channel contains no/little spike activities, the recorder bandwidth is automatically reduced to record local field potentials (LFPs) only. The bandwidth reduction enables substantial power saving for that channel (4 times in the current implementation). The bandwidth is then automatically restored back to 8 kHz once spikes are detected from the spiking probability map. A prototyping chip has been fabricated in a 0.13 μm CMOS process. When measured at a 80 kHz sampling clock and 1.0 V supply, the recorder achieves a 3 pF input capacitance, 2.2 μV input noise for recording spikes, and 15 μW/ch power for amplifiers, filters, multiplexer, analog-to-digital converter (ADC), and digital filters combined. Empirical studies on in-vivo recordings from monkeys show that over 70% of channels do not contain detectable spikes, suggesting an averaged recording power reduction by 50% to 7.5 μW/ch.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"248 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115616758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Yoshida, M. Hamaguchi, T. Morishita, Shinji Shinjo, Akira Nagao, M. Miyamoto
{"title":"An 87×49 mutual capacitance touch sensing IC enabling 0.5 mm-diameter stylus signal detection at 240 Hz-reporting-rate with palm rejection","authors":"S. Yoshida, M. Hamaguchi, T. Morishita, Shinji Shinjo, Akira Nagao, M. Miyamoto","doi":"10.1109/ASSCC.2014.7008899","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008899","url":null,"abstract":"A touch sensing system capable of stylus input should have “palm rejection” function which allows the user to place one's palm on the surface of the touch sensor while writing with a stylus. In order to realize “palm rejection”, it is necessary to detect the small stylus while neglecting large signal from the palm. However this is not sufficient because small electrical noise injected through the palm into the touch sensor impedes stylus input signal in real use. This issue is because the injected noise propagates onto the touch sensor's sense channels which are capacitively-coupled with the palm and degrades the SNR of the stylus signal on the channels. A simple and effective technique to eliminate this issue is implemented in a newly developed 87×49 mutual capacitance touch sensing IC which is fabricated in an 85 nm CMOS technology. It achieves an SNR over 33 dB for a 0.5 mm-diameter stylus when a 10 Vp-p sinusoidal noise is injected to the stylus and the palm. Both the die area and the power consumption of a unit charge-to-voltage converter (CVC) designed for the IC are reduced to approximately 50% compared to those of the previous implementation [4]. In order not to report unwanted touches due to palm signals, a palm detection filter is implemented in the digital signal processor on the IC.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123917977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A novel 2.4-to-3.6 GHz wideband subharmonically injection-locked PLL with adaptively-aligned injection timing","authors":"Zhao Zhang, Liyuan Liu, N. Wu","doi":"10.1109/ASSCC.2014.7008937","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008937","url":null,"abstract":"A novel wideband subharmonically injection-locked PLL (SILPLL) is proposed. It adopts a new injection timing alignment technique to adjust injection timing adaptively in wide range of the output clock frequency. A proposed pulse generator is used for half-integral injection to relax the trade-off between phase-noise of SILPLL and output frequency resolution. The SILPLL is implemented in 65 nm 1P9M CMOS process. It consumes 9.1mW from a 1.2V supply and occupies an active core area of 1×0.6 mm2. The measured output frequency range is 2.4~3.6GHz and the rms jitter integrated from 1kHz to 30MHz is 146fs when output frequency is 3GHz.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128308492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A current-mode buck converter with bandwidth reconfigurable for enhanced efficiency and improved load transient response","authors":"Pai-Yi Wang, Li-Te Wu, T. Kuo","doi":"10.1109/ASSCC.2014.7008862","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008862","url":null,"abstract":"Current-mode control is commonly used in buck converters. Many current-mode buck converters with variable-frequency controllers have been published for smaller inductance and maintaining efficiency via fast and slow frequency, respectively. However, bandwidth of the current-mode buck converter with fixed compensation coefficients is limited by the lowest switching frequency, thus decreases transient speed. This paper proposes a current-mode buck converter with reconfigurable compensation coefficients controlled by a switched-capacitor compensator and activated by a transient detector. Fabricated in 0.35μm CMOS process, this chip occupying 0.91mm2 achieves 96.3% peak efficiency. A 5μs settling time is measured with 75mV undershoot for 700mA load transition.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128487625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A 5.2mW IEEE 802.15.6 HBC standard compatible transceiver with power efficient delay-locked-loop based BPSK demodulator","authors":"Hyunwoo Cho, Hyungwoo Lee, Joonsung Bae, H. Yoo","doi":"10.1109/ASSCC.2014.7008919","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008919","url":null,"abstract":"A low power fully IEEE 802.15.6 HBC compatible transceiver is implemented in 0.13μm CMOS process. The transmitter uses an analog active filter instead of digital type filter to remove the power-hungry high speed DAC and clock generation. In the receiver, a power-efficient delay-locked-loop (DLL) based BPSK demodulator is adopted to relax the stability problem of synchronization feedback loop. The sample and hold operation in the control voltage of the DLL enables the receiver to turn off the synchronization circuits during the hold time, leading to over 30% power reduction. The energy detection ability with Received Signal Strength Indicator (RSSI) detector for MAC operation adjusts the operating mode of LNA and even reconfigures the receiver architecture for power-efficient operation, resulting in over 70% power saving. As a result, the proposed transceiver can fully satisfy the HBC standard while consuming 4.3mA from the 1.2V supply.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127104651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A 0.3V 10bit 7.3fJ/conversion-step SAR ADC in 0.18μm CMOS","authors":"C. Hsieh, Shen-Iuan Liu","doi":"10.1109/ASSCC.2014.7008926","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008926","url":null,"abstract":"A 0.3V 10-bit rail-to-rail successive approximation register (SAR) analog-to-digital converter (ADC) is realized in 0.18-μm CMOS process. While the supply is 0.3V, a double-boosted sampling switch and a supply-boosted time-domain comparator are proposed to decrease the on-resistance of the switches and improve the conversion time, respectively. To lower the power, differential dynamic switches are used to control the splitting capacitors of the digital-to-analog converter. This ADC achieves the SNDR of 54.57dB and the SFDR of 69.89dB, respectively. The power consumes 15.9nW at 5kS/s from a 0.3V supply. A figure-of-merit of 7.3fJ/conversion-step for this ADC is achieved.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130646301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N. Kuo, Bonjern Yang, Chaoying Wu, Lingkai Kong, Angie Wang, M.T. Reiha, E. Alon, A. Niknejad, B. Nikolić
{"title":"A frequency-reconfigurable multi-standard 65nm CMOS digital transmitter with LTCC interposers","authors":"N. Kuo, Bonjern Yang, Chaoying Wu, Lingkai Kong, Angie Wang, M.T. Reiha, E. Alon, A. Niknejad, B. Nikolić","doi":"10.1109/ASSCC.2014.7008931","DOIUrl":"https://doi.org/10.1109/ASSCC.2014.7008931","url":null,"abstract":"This paper demonstrates a CMOS digital polar transmitter with flip-chip interconnection to low-temperature co-fired ceramic (LTCC) interposers. The LTCC interposers contain the PA output balun targeting different operating frequency bands, and the reconfiguration in the carrier frequency is achieved by selecting an appropriate LTCC interposer. The same CMOS core transmitter is reused for different frequency bands. In this design, an output power higher than 22 dBm from 0.6 to 2.4 GHz is demonstrated, with peak power of 27.1 dBm and peak efficiency of 52%. The polar transmitter includes 9-bit phase interpolation and 8-bit amplitude modulation, suitable and verified as a multi-standard universal digital modulator.","PeriodicalId":161031,"journal":{"name":"2014 IEEE Asian Solid-State Circuits Conference (A-SSCC)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132441903","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}