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Class-F Power Amplifiers for WCDMA Base Station Transmitters Vana Venkataramani CWT Virginia Tech January 16 2004.

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Presentation on theme: "Class-F Power Amplifiers for WCDMA Base Station Transmitters Vana Venkataramani CWT Virginia Tech January 16 2004."— Presentation transcript:

1 Class-F Power Amplifiers for WCDMA Base Station Transmitters Vana Venkataramani CWT Virginia Tech January

2 This presentation focuses on the models, components, and performance of Choir Algorithm Models and Algorithms Real-Time Switched Ethernet RM GUI User input Host 1 Host n Meta-sched POSIX OS thread code RTSL Meta-sched POSIX OS thread code RTSL Components of Choir Performance of Choir 2

3 This presentation will discuss how to use counter 0 and counter 2 for project 1 Use counter 0 for the 1 second delay CE CE CE ABCDE... ZYXWV... Use counter 2 for the 0.5 second delay

4 This delay method can result in an error of up to 1 period length Use a small period with more iterations for less error Loop enteredLoop exited Error for sample code is 1 ms Example for i = 1: ABCDE... ZYXWV...

5 The startup.asm file contains your segment definitions and handles initializations If _main() should ever return, we just go back and start the program over. public start start PROC NEAR ; set up DS mov ax, DGROUP mov ds, ax ; set up SS and SP mov ss, ax lea sp, TOPS ; run user program call _main ; if the user program returns, then reset jmp start start ENDP

6 The designed amplifier shows very good performance throughout the WCDMA band High efficiency (60%) has been achieved Class-AB linearity is maintained (IMD = -30 dBc) Good harmonic suppression is achieved (-60 dBc) 6

7 The graphics user interface helps in composing systems and visualizing algorithm outputs Composing system Visualizing algorithm outputs 7

8 In summary, multi-criteria scheduling in soft real-time systems shows much promise Soft time constraints provide more flexibility in scheduling Multiple criteria need to be considered in real world Important applications are envisioned Questions? 8


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