Browsing by Author "Juang, Kai-Chenug"

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A 1.2V Interference-Sturdiness, DC-Offset Calibrated CMOS Receiver Utilizing a Current-Mode Filter for UWB
(2008)
Shih, Horng-Yuan
;
Chen, Wei-Hsien
;
Juang, Kai-Chenug
;
Yang, Tzu-Yi
;
Kuo, Chien-Nan
An interference-sturdiness receiver with a current-mode filter for 3-5GHz UWB applications is implemented in a 1.2V 0.13 mu m CMOS process. The chip provides a maximum voltage gain of 70dB and a dynamic range of 60dB. The measured in-band OIP3 is +9.39dBm, out-of-band IIP3 -15dBm and noise figure 6.8dB in the maximum gain mode. An algorithm for the automatic digital DC offset calibration is also demonstrated.
A 250 MHz 14 dB-NF 73 dB-Gain 82 dB-DR Analog Baseband Chain With Digital-Assisted DC-Offset Calibration for Ultra-Wideband
(2010-02-01)
Shih, Horng-Yuan
;
Kuo, Chien-Nan
;
Chen, Wei-Hsien
;
Yang, Tzu-Yi
;
Juang, Kai-Chenug
A 250 MHz analog baseband chain for Ultra-Wideband was implemented in a 1.2 V 0.13 mu m CMOS process. The chip has an active area of 0.8 mm(2). In the analog baseband, PGAs and filters are carried out by current-mode amplifiers to achieve wide bandwidth and wide dynamic range of gain, as well as low noise and high linearity. Besides, a current-mode Sallen-Key low-pass filter is adopted for effective rejection of out-of-band interferers. A 6th-order Chebyshev low-pass filter realized in G(m)-C topology is designed in the baseband chain for channel selection. Digitally-assisted DC-offset calibration improves second-order distortion of the entire chain. The design achieves a maximum gain of 73 dB and a dynamic range of 82 dB. Measured noise figure is 14 dB, an IIP3 of -6 dBV, and IIP2 of -5 dBV at the maximum gain mode. The analog baseband chain consumes 56.4 mA under supply of 1.2 V.
A Ultra-Low Power Channel Selection filter For Low-IF FSK Biomedical Receivers
(2012)
Shih, Horng-Yuan
;
Chen, Wei-Hsien
;
Juang, Kai-Chenug
;
Chen, Chun-Fan
;
Lin, Sheng-Kai
Ultra-low power (ULP) receivers can be applied in wearable and implantable biomedical sensors. In this paper, a ULP band-pass filter designed as a channel selection filter for low-IF FSK biomedical receivers is implemented in 1.8 V 0.18 mu m CMOS process. Under power consumption of 200 mu W, the measured central frequency and bandwidth is 1.5 MHz and 330 kHz, respectively. As applied in a low-IF FSK biomedical receiver, data rate of 330 kb/s can be achieved.