Design of High Gain Wideband Low Noise Amplifier based on Matching technique for Multiple Applications

Increasing demands of portable wireless devices have motivated the development of CMOS radio frequency integrated circuits (RFIC). In wireless system Low Noise Amplifier is the first stage of any RF Receiver design. Performance of RF receiver mainly depends on the effectiveness of LNA. The main objective of the LNA design is to get good gain with minimum noise generation for the entire operating frequency range. With proper matching, Wideband LNA would be one with approximately or exactly the same operating characteristics over a very wide passband and would be used for multiple applications. An efficient LNA design has to manage trade-off between Gain, Noise Figure, Input-Output Losses, power consumption and device’s stability. The LNA would be designed and will be simulated on Agilent’s ADS. Keywords— Gain, Impedance Matching, Noise Figure, Power Consumption, Wideband, Reflection Coefficient, Stability INTRODUCTION With rapidly increasing technology, wireless communication is evidencing introduction of various communication standards. Despite the fact that digital circuits currently offer an impressive performance, pure digital signal processing of radio signals remains limited for relatively low frequencies below a few hundred MHz On the other hand, frequency bands used in current mobile applications span from around 800MHz up to 6 GHz and hence demand the use of analog circuits to down-convert the radio signals to lower frequencies that are suitable for digital processing. The group of circuits that form this part of the receiver is known as the radio receiver front-end. The rapidly increasing applications for wireless communication systems demands for wideband multiple standard wireless system. It is therefore, desirable to develop a single mobile terminal compatible with several standards. To cope up the growth of technology need’s a Multiband/wideband Receiver that would support multiple standard applications. In Wireless communication systems, Low noise amplifier is the chief component of any RF receiver design. Low Noise Amplifier (LNA) is an electronic amplifier used to amplify possibly very weak signals and is placed at the front end of a receiver. LNA’s performance has direct impact on the overall receiver performance. Fig 1. RF Receiver with LNA When the signal couples from antenna into a LNA circuit, signal is amplified and transmitted to a mixer system including the reduction of the noise coming from outside or circuit inside. LNA is usually located very close to the detection device to reduce losses International Journal of Engineering Research and General Science Volume 3, Issue 2, March-April, 2015 ISSN 2091-273