Browsing by Author "Meng, C"

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General purpose RFICs using 0.35 um SiGeBiCMOS technology
(2005)
Meng, C
;
Wu, TH
;
Wu, TH
;
電信工程研究所
;
Institute of Communications Engineering
This paper presents an overview of several 5 GHz general purpose RFICs implemented using 0.35 urn SiGe BiCMOS technology by our research group. These RFICs include emitter-inductively-degenerated cascode LNA, shunt-series shunt-shunt dual feedback wideband amplifier, common mode feedback Gilbert down-converter, Gilbert up-converter with LC current mirrors and Gilbert down-converter with polyphase filters for image rejection.
True 50% duty-cycle SSH and SHHSiGeBiCMOS divide-by-3 prescalers
(2006-06-01)
Tseng, SC
;
Meng, C
;
Chen, WY
;
電信工程研究所
;
Institute of Communications Engineering
Four 50% duty-cycle divide-by-3 prescalers-positively/negatively triggered sample-sample-hold (SSH) and sample-hold-hold (SHH) prescalers-are designed based on the current switchable D flip-flops and discussed in this paper. The positively triggered SSH and SHH prescalers are fabricated using the 0.35-mu m SiGe BiCMOS technology and measured by the real-time oscilloscope and the spectrum analyzer. The SHH prescaler is our proposed structure and demonstrated in this paper. According to the measurement results, under the condition of the same input power, its maximum operation frequency is twice as high as that of the SSH prescaler thanks to better signal synchronization. At 2.7 V supply, the SSH prescaler operates from 500 MHz to 2 GHz as the SHH prescaler performs from 1 GHz to 3.4 GHz. The input sensitivity level of both structures is about -5 dBm, while the maximum output power is also about -5 dBm. The core current consumption is 4.538 mA and 4.258 mA for the SSH and SHH prescalers, respectively.