logging in or signing up MULTI-STAGE AMPLIFIERS ramanagaram Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Copy Does not support media & animations WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 422 Category: Entertainment License: All Rights Reserved Like it (1) Dislike it (0) Added: June 24, 2012 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript MULTI-STAGE AMPLIFIERS: LARGE-SIGNAL DESIGN: MULTI-STAGE AMPLIFIERS: LARGE-SIGNAL DESIGN By Tabassum unnisa rvce , bangaloreContents: Contents Introduction Analysis Multi-stage amplifier Third order intercept point power Dynamic range consideration Wide dynamic range Multi-stage amplifier Problem solution INTRODUCTION: INTRODUCTION A power amplifier (PA) is a circuit for converting DC input power into a significant amount of RF/microwave output power. In a high power amplifier, each stage should be designed for operation at maximum power ,such that, maximum power transfer condition is met. Most important parameters that defines an RF Power Amplifier are: Output power 1-db gain compression point Dynamic range Third order intercept point power Efficiency 1-db gain compression point: 1-db gain compression point The point at which the power gain of the transistor, due to non- linearities , is reduced by 1 dB from it’s small signal linear power gain value. G 1dB =G 0dB -1dB G 1dB =P 1dB /P in,1dB P 1dB ( dBm ) =P in,1dB ( dBm ) + G 1dB (dB) DR = P 1dB -P 0,mds (dB) Analysis of MULTI-STAGE AMPLIFIERS: Analysis of MULTI-STAGE AMPLIFIERS M1 M3 M2 Mn 50 Ω Stage 1 Stage 2 Stage n N-stage FET amplifierPowerPoint Presentation: Maximum power transfer conditions Third order intercept point power: Third order intercept point power 1/P TOI =1/P TOI,n +1/( G Pn P TOI,n-1 )+-----+ 1/( G Pn G Pn-1 G P2 P TOI,1 ) Where, Gp is power gain. If all stages are identical, i.e., Gpk = Gp , k=1,2,…n P TOI,k =P, k=1,2,…n Geometric series identityPowerPoint Presentation: As Third order intercept point is a power amplifier figure of meritWide dynamic range Multi-stage amplifier design: Wide dynamic range Multi-stage amplifier design For n-stage amplifier, DR=P 1dB,cas ( dBm )-(P 0,mds ) cas ( dBm ) a)From (P 0,mds ) cas ≥(P 0,mds ) 1 ,we can conclude that first stage sets the lower limit and ideally, (P 0,mds ) cas =(P 0,mds ) 1 b) From P 1dB,cas ≤ P 1dB,n ,we can observe that the upper limit is determined by 1-dB gain gain compression point of the last stage and ideally, P 1dB,cas = P 1dB,nWide dynamic range contd..: Wide dynamic range contd.. Thus , the maximum dynamic range or the best estimate of the dynamic range, DR max = P 1dB,n ( dBm )-(P 0,mds ) 1 ( dBm )Thank you: Thank you You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.