A 5th-Order SC Complex BPF Using Series Capacitances for Low-IF Narrowband Wireless Receivers

Mitsuru HARADA

IEICE TRANSACTIONS on Electronics   Vol.E94-C    No.5    pp.890-895
Publication Date: 2011/05/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.890
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Electronic Circuits
complex filters,  BPF,  switched-capacitor circuits,  low-IF,  CMOS,  low-power,  

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A fifth-order switched-capacitor (SC) complex filter was implemented in 0.2-µm CMOS technology. A novel SC integrator was developed to reduce the die size and current consumption of the filter. The filter is centered at 24.730.15 kHz (3δ) and has a bandwidth of 20.260.3 kHz (3δ). The image channel is attenuated by more than 42.6 dB. The in-band third-order harmonic input intercept point (IIP3) is 17.3 dBm, and the input referred RMS noise is 34.3 µVrms. The complex filter consumes 350 µA with a 2.0-V power supply. The die size is 0.578 mm2. Owing to the new SC integrator, the filter achieves a 27% reduction in die size without any degradation in its characteristics, including its noise performance, compared with the conventional equivalent.