A differential multi-band CMOS low noise amplifier with noise cancellation and interference rejection
In this paper, a differential multi-band CMOS low noise amplifier (LNA), operated in a wide range from 1350 to 2900 MHz , with input matching device, noise cancellation and interference rejection technology, is proposed. Traditional wideband LNAs have poor performances on interference rejection or image rejection. In this design, a multi-band CMOS LNA with matching device noise cancelling, matching device current reuse and source inductance device reuse technologies is proposed, it can improve noise figure, wideband match and interference rejection. There exists a switch-mode notch filter to enhance the interference rejection performance and it does not need additional inductors. A prototype of proposed multi-band CMOS LNA was designed to work at 1450  1490 MHz , 1680  1685 MHz and 2635 HMz  2660 MHz . The simulation results show that the gain is between 18 and 19dB at L-band application (14501685MHz) and between 25.8 and 26.1dB at CMMB Satellite application ( 2635 HMz  2660 MHz ) , the noise figure is 3.13.3dB, and the third-order intercept point (IIP3) is ? 7 dBm . It consumes 27.35mW under 1.8V supply voltage in TSMC 0.18-?m ? m RF CMOS process.
noise cancellation interference rejection current reuse noise figure multi-band low noise amplifier