A low-pass filter with automatic frequency tuning for a bluetooth receiver
M. Pedro, J. Galán, Trinidad Sánchez-Rodríguez, F. Muñoz, R.G. Carvajal, Antonio J. López‐Martín · 2010
A third-order Gm-C Chebyshev low-pass filter with high linearity and automatic frequency programmability has been designed. The filter is intended to be used as a channel-select filter for a zero-IF Bluetooth receiver. The frequency tuning scheme is simpler and has more relaxed specifications than conventional ones. The filter bandwidth is 0.5 MHz and the overall scheme dissipates 1.1 mA from a 1.8-V supply. The third-order intermodulation (IM3) distortion of the filter for a 1Vpp two-tone signal centered at 350 kHz is -67dB.