A 5th order 14 mWatt active polyphase filter for Analog and Digital TV on Mobile applications

Abstract

To be compatible with a low-IF and zero-IF output interfaces and analog and digital TV standards a reconfigurable active polyphase filter has been developed for a DVB-T/H/analog TV receiver (TV-tuner) for mobile (portable) applications. The filter with a bandwidth of 8 MHz acts as a band pass filter with a centre frequency of 5 MHz or as a low pass filter with a cut-off frequency of 4 MHz. The balanced integrator filter (active RC) is based on a 5th order elliptic (Cauer) filter and achieves a stop-band suppression of more than 60 dB and a image rejection of 50 dB. The 0.8times0.85 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> IC has been implemented in a 0.25 mum, 37 GHz f <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">T</sup> BiCMOS technology and dissipates 14 mW from a 2.7V supply