In this letter,we design and analyze 0.1–1.5 GHz multi-octave quadruple-stacked CMOS power amplifier(PA)in 0.18μm CMOS technology.By using two-stage quadruple-stacked topology and feedback technology,the proposed PA...In this letter,we design and analyze 0.1–1.5 GHz multi-octave quadruple-stacked CMOS power amplifier(PA)in 0.18μm CMOS technology.By using two-stage quadruple-stacked topology and feedback technology,the proposed PA realizes an ultra-wideband CMOS PA in a small chip area.Wideband impedance matching is achieved with smaller chip dimension.The effects of feedback resistors on the RF performance are also discussed for this stacked-FET PA.The PA shows measured input return loss(<–10.8 dB)and output return loss(<–9.6 dB)in the entire bandwidth.A saturated output power of 22 dBm with maximum 20%power added efficiency(PAE)is also measured with the drain voltage at 5 V.The chip size is 0.44 mm^2 including all pads.展开更多
Mid-infrared(MIR)Kerr microcombs are of significant interest for portable dual-comb spectroscopy and precision molecular sensing due to strong molecular vibrational absorption in the MIR band.However,achieving a compa...Mid-infrared(MIR)Kerr microcombs are of significant interest for portable dual-comb spectroscopy and precision molecular sensing due to strong molecular vibrational absorption in the MIR band.However,achieving a compact,octave-spanning MIR Kerr microcomb remains a challenge due to the lack of suitable MIR photonic materials for the core and cladding of integrated devices and appropriate MIR continuous-wave(CW)pump lasers.Here,we propose a novel slot concentric dual-ring(SCDR)microresonator based on an integrated chalcogenide glass chip,which offers excellent transmission performance and flexible dispersion engineering in the MIR band.This device achieves both phase-matching and group velocity matching in two separated anomalous dispersion regions,enabling phase-locked,two-color solitons in the MIR region with a commercial 2-μm CW laser as the pump source.Moreover,the spectral locking of the two-color soliton enhances pump wavelength selectivity,providing precise control over soliton dynamics.By leveraging the dispersion characteristics of the SCDR microresonator,we have demonstrated a multi-octave-spanning,two-color soliton microcomb,covering a spectral range from 1156.07 to 5054.95 nm(200 THz)at a-40 dB level,highlighting the versatility and broad applicability of our approach.And the proposed multi-octave MIR frequency comb is relevant for applications such as dual-comb spectroscopy and trace-gas sensing.展开更多
基金supported by the National Natural Science Foundation of China(No.61841110)AoShan Talents Outstanding Scientist Program by Pilot National Laboratory for Marine Science and Technology(Qingdao)(No.2017ASTCP-OS03)。
文摘In this letter,we design and analyze 0.1–1.5 GHz multi-octave quadruple-stacked CMOS power amplifier(PA)in 0.18μm CMOS technology.By using two-stage quadruple-stacked topology and feedback technology,the proposed PA realizes an ultra-wideband CMOS PA in a small chip area.Wideband impedance matching is achieved with smaller chip dimension.The effects of feedback resistors on the RF performance are also discussed for this stacked-FET PA.The PA shows measured input return loss(<–10.8 dB)and output return loss(<–9.6 dB)in the entire bandwidth.A saturated output power of 22 dBm with maximum 20%power added efficiency(PAE)is also measured with the drain voltage at 5 V.The chip size is 0.44 mm^2 including all pads.
基金National Natural Science Foundation of China(NSFC)(Grant Nos.62375292 and 61975242)Natural Science Foundation of Guangdong Province for Distinguished Young Scholars(No.2023B1515020028)Fund of Sun Yat-sen University(No.12240012).
文摘Mid-infrared(MIR)Kerr microcombs are of significant interest for portable dual-comb spectroscopy and precision molecular sensing due to strong molecular vibrational absorption in the MIR band.However,achieving a compact,octave-spanning MIR Kerr microcomb remains a challenge due to the lack of suitable MIR photonic materials for the core and cladding of integrated devices and appropriate MIR continuous-wave(CW)pump lasers.Here,we propose a novel slot concentric dual-ring(SCDR)microresonator based on an integrated chalcogenide glass chip,which offers excellent transmission performance and flexible dispersion engineering in the MIR band.This device achieves both phase-matching and group velocity matching in two separated anomalous dispersion regions,enabling phase-locked,two-color solitons in the MIR region with a commercial 2-μm CW laser as the pump source.Moreover,the spectral locking of the two-color soliton enhances pump wavelength selectivity,providing precise control over soliton dynamics.By leveraging the dispersion characteristics of the SCDR microresonator,we have demonstrated a multi-octave-spanning,two-color soliton microcomb,covering a spectral range from 1156.07 to 5054.95 nm(200 THz)at a-40 dB level,highlighting the versatility and broad applicability of our approach.And the proposed multi-octave MIR frequency comb is relevant for applications such as dual-comb spectroscopy and trace-gas sensing.
