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An In-Band Noise Filtering 32-tap FIR-Embedded ΔΣ Digital Fractional-N PLL
이종미,지동우,김병섭,박홍준,심재윤 대한전자공학회 2015 Journal of semiconductor technology and science Vol.15 No.3
This paper presents a 1.9-GHz digital ΔΣ fractional-N PLL with a finite impulse response (FIR) filter embedded for noise suppression. The proposed digital implementation of FIR provides a simple method of increasing the number of taps without complicated calculation for gain matching. This work demonstrates 32 tap FIR filtering for the first time and successfully filtered the in-band phase noise generated from delta-sigma modulator (DSM). Design considerations are also addressed to find the optimum number of taps when the resolution of time-to-digital converter (TDC) is given. The PLL, fabricated in 0.11-μm CMOS, achieves a well-regulated in-band phase noise of less than -100 dBc/Hz for the entire range inside the bandwidth of 3 MHz. Compared with the conventional dual-modulus division, the proposed PLL shows an overall noise suppression of about 15dB both at in-band and out-of-band region.
Switchable Junction Organic Photodiode based on Light-Intensity-Dependent Molecular Switch
강민균,Syed Zahid Hassan,고성민,최창원,Santosh Kumar Reddy Parumala,장윤희,윤진환,지동우,정대성 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
A strategy to artificially widen linear dynamic range (LDR) of organic photodiode (OPD) by introducing a light-intensity-dependent transition of its operation mode, such that low saturation photocurrent can be overcome, is proposed. The active layer of OPD is doped with a strategically designed and synthesized molecular switch (1,2-bis-[2-methyl-5-(4-cyanobiphenyl)-3-thienyl]tetrafluorobenzene; DAB) and the resulting OPD shows typical OPD performances with an external quantum efficiency (EQE) < 100% under low-intensity light illumination but shows photomultiplication behaviors with an EQE > 100% under high-enough-intensity light illumination, resulting in artificially extended LDR up to 225 dB. Such a unique and reversible transition of operation mode by light intensity self-recognition of molecular-switch-embedded OPD can be explained by unbalanced quantum yield of photocyclization/photocycloreversion of molecular switch.