Implementation of Compact Polyphase Channel-Select Filters for Multistandard Broadcasting

An 8th-order fully electronically programmable complex filter based on current amplifiers for multistandard mobile TV applications is presented. Its center frequency, pole frequency, and gain are electronically programmable to accommodate both Integrated Services Digital Broadcasting-Terrestrial (ISDB-T) and Terrestrial Digital Multimedia Broadcasting (T-DMB). The proposed solution avoids employing capacitor and resistor arrays leading to a compact design (0.51 mm²). It adopts minimum number of amplifiers for maintaining relatively low power consumption (2.55 mW). The experimental results obtained from a 0.18-μm digital CMOS process show that the proposed design achieves spurious-free dynamic range (SFDR) of better than 65 dB and image rejection ratios of more than 38 dB.