A 5th-Order SC Complex BPF Using Series Capacitances for Low-IF Narrowband Wireless Receivers
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概要
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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 24.73±0.15kHz (3δ) and has a bandwidth of 20.26±0.3kHz (3δ). The image channel is attenuated by more than 42.6dB. The in-band third-order harmonic input intercept point (IIP3) is 17.3dBm, and the input referred RMS noise is 34.3µVrms. The complex filter consumes 350µA with a 2.0-V power supply. The die size is 0.578mm2. 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.
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