A broadband CMOS RF receiver for digital broadcasting systems

摘要

Nowadays digital radio systems are replacing analog radio systems. In this paper, a CMOS RF receiver with frequency synthesizer and analog baseband is introduced, which was fabricated with a 0.18-µm CMOS process for DRM/DAB wideband applications. In the system, a fully differential low noise amplifier with a noise cancelling technology is adopted It has achieved a gain of 11.69 dB. A harmonic rejection mixer was implemented to realize the rejections of 3rd- and 5th-order harmonics. As the local oscillator, a wide-band frequency synthesizer provides a phase noise of −125 dBc/Hz at 1-MHz offset. The designed RF receiver has achieved a conversion gain of 90 dB. The IIP3 of the receiver is in the range of −25 to −12 dBm, and the noise figure of 5.44–14.72 dB. The core circuits draw a current of 78.35 mA from a 1.8-V power supply and the chip occupies 6.46-mm2 die area.