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A CMOS RF(radio frequency) front-end for digital radio broadcasting applications is presented that contains a wideband LNA,I/Q-mixers and VGAs,supporting other various wireless communication standards in the ultrawide frequency band from 200 kHz to 2 GHz as well.Improvement of the NF(noise figure) and IP3(third-order intermodulation distortion) is attained without significant degradation of other performances like voltage gain and power consumption.The NF is minimized by noise-canceling technology,and the IP3 is improved by using differential multiple gate transistors(DMGTR).The dB-in-linear VGA(variable gain amplifier) exploits a single PMOS to achieve exponential gain control.The circuit is fabricated in 0.18-μm CMOS technology.The S_(11) of the RF front-end is lower than -11.4 dB over the whole band of 200 kHz-2 GHz.The variable gain range is 12-42 dB at 0.25 GHz and 4-36 dB at 2 GHz.The DSB NF at maximum gain is 3.1-6.1 dB.The IIP3 at middle gain is -4.7 to 0.2 dBm.It consumes a DC power of only 36 mW at 1.8 V supply.
A CMOS RF (radio frequency) front-end for digital radio broadcasting applications is presented that contains a wideband LNA, I / Q-mixers and VGAs, supporting other various wireless communication standards in the ultrawide frequency band from 200 kHz to 2 GHz as well . Impression of the NF (noise figure) and IP3 (third-order intermodulation distortion) is attained without significant degradation of other performances like voltage gain and power consumption. The NF is minimized by noise-canceling technology, and the IP3 is improved by using Differential multiple gate transistors (DMGTR). The dB-in-linear VGA (variable gain amplifier) exploits a single PMOS to achieve exponential gain control. The circuit is fabricated in a 0.18-μm CMOS technology.The S_ (11) of the RF front -end is lower than -11.4 dB over the whole band of 200 kHz-2 GHz. The variable gain range is 12-42 dB at 0.25 GHz and 4-36 dB at 2 GHz. The DSB NF at maximum gain is 3.1-6.1 dB.The IIP3 at middle gain is -4.7 to 0.2 dBm.It consumes a D C power of only 36 mW at 1.8 V supply.