Radio‐frequency amplifier with tunable high‐Q RF bandpass filtering for SAW‐less wireless receivers. Issue 10 (1st May 2013)

• Record Type: Journal Article
• Authors: Qi, Nan; Chi, Baoyong; Xu, Yang; Wang, Zhihua
• Is Part Of: Electronics letters. Volume 49:Issue 10(2013)
• Page Start: 656
• Page End: 658
• Publication Date: 2013-05-01
• Subjects: band‐pass filters -- CMOS analogue integrated circuits -- differential amplifiers -- radio receivers -- UHF amplifiers -- UHF filters -- UHF integrated circuits -- UHF oscillators; tunable high‐Q RF bandpass filtering -- SAWless wireless receiver -- inductorless on‐chip radiofrequency bandpass filtering -- RF‐BPF -- tunable centre frequency -- SAW filter -- local oscillation frequency -- LO -- low‐IF application -- single‐ended‐input differential‐output radiofrequency amplifier -- RFA -- CMOS technology -- size 65 nm -- current 3.5 mA -- voltage 2.5 V -- gain 16 dB -- frequency 1.5 GHz -- frequency 7 MHz; band‐pass filters -- CMOS analogue integrated circuits -- differential amplifiers -- radio receivers -- UHF amplifiers -- UHF filters -- UHF integrated circuits -- UHF oscillators; tunable high‐Q RF bandpass filtering -- SAWless wireless receiver -- inductorless on‐chip radiofrequency bandpass filtering -- RF‐BPF -- tunable centre frequency -- SAW filter -- local oscillation frequency -- LO -- low‐IF application -- single‐ended‐input differential‐output radiofrequency amplifier -- RFA -- CMOS technology -- size 65 nm -- current 3.5 mA -- voltage 2.5 V -- gain 16 dB -- frequency 1.5 GHz -- frequency 7 MHz; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2013.0618
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : An inductor‐less on‐chip radio frequency bandpass filtering (RF‐BPF) technique with tunable centre frequency is proposed to replace the bulky and expensive external SAW filter. The centre frequency of the BPF not only tracks the local oscillation (LO) frequency ( f LO ), but also can be shifted from f LO to a controllable offset for low‐IF applications. The RF‐BPF has been embedded into a single‐ended‐input differential‐output radio frequency amplifier (RFA) and implemented in 65nm CMOS. The RFA draws 3.5 mA DC current from a 2.5 V power supply. Measurement results show that the BPF achieves 16 dB attenuation at 150 MHz offset from the 1.5 GHz centre frequency, and 7 MHz tunable range without changing the LO frequency.