LNA for a 2.4 GHz ISM Receiver: Amplificador de Baixo Ruído para a Banda ISM de 2.4 GHz em Tecnologia CMOS

09/07/2010

This thesis presents a low cost and low power low noise amplifier (LNA) to be included in the analog frontend of a radio receiver operating in the 2.4 GHz ISM band. The investigated LNAs are inductorless in order to reduce cost, as inductors substantially increase circuit area, and use feedback loops to achieve impedance matching with the antenna. These LNAs allow an almost independent design of the voltage gain and of the input matching, while benefitting from the advantages of feedback loops, such as, desensitization of the gain, lower nonlinear distortion and higher bandwidth. During the LNA implementation, several aspects are taken in consideration to ensure the correct functioning of the LNA and of the radio receiver, such as the inclusion of protection from electrostatic discharges, the design of a buffer and an output stage for the LNA, and circuit simulations with bonding wire models and pads. The LNA is implemented in a 0.13 um CMOS technology and has an active area of 75x155 um2 including the buffer and the output stage. The LNA exhibits a voltage gain of 16.50 dB, a S11 of -11.77 dB, a noise figure of 2.66 dB and an IIP3 of -4.97 dB, at 2.4 GHz, while having a power consumption of 3.22mW for a voltage supply of 1.2V. The radio receiver where the LNA is included has an area of 0.39 mm2, a voltage gain of 27.6 V, while having a power consumption of 16.26 mW for a voltage supply of 1.2 V.

Authors in the community:

• 

  J

  José Miguel Heitor Machado Dores

  ist154792

Supervisors of this institution:

• 

  M

  Miguel Andrade Martins

  ist402222

• 

  J

  Jorge Manuel Dos Santos Ribeiro Fernandes

  ist13276

electrical-engineering-electronic-engineering-information-engineering - Electrical engineering, electronic engineering, information engineering

eng - English

Instituto Superior Técnico