L06_Bandwidth and Quality Factor_Sp11

L06_Bandwidth and Quality Factor_Sp11 - EEL 4422 / EEL 6427...

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EEL 4422 / EEL 6427 RF & Microwave Circuits II Lecture #6 andwidth and Quality factor Q Bandwidth and Quality factor Q 1
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Facts about Bandwidth of Matching Networks If you are matching two very different pedances (e g 2 Ohms and 100 Ohms) impedances (e.g. 2 Ohms and 100 Ohms) the bandwidth tends to be fairly small (or, the tends to be fairly high) Q tends to be fairly high) Bandwidth can be an issue if: our design must be broadband (e.g. you are Your design must be broadband (e.g. you are designing for a high data rate application) You are concerned about the impedance presented to harmonics (a very important issue in power amplifier design) 2
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Bandwidth & Quality Factor (Q) In a resonant matching circuit, the transfer function (e.g. S 21 or v o /v s ) will typically peak at the “center frequency” f o “Bandwidth” f is typically defined by the 3-dB points in the transfer function (e.g. S 21 ) In a resonant “narrow band” circuit, the bandwidth & Q factor are related: BW L f f Q 0 3 Loaded Q of the circuit
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Example Ell network Q factor (2.4.5) 3 dB f 1 2 = 275 MHz 2 = 650 MHz 0 L BW f 500MHz Q1 . 3 3 f3 7 5 M H z  4
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This note was uploaded on 01/24/2011 for the course ECE 6936 taught by Professor Mumcu during the Spring '10 term at University of South Florida - Tampa.

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L06_Bandwidth and Quality Factor_Sp11 - EEL 4422 / EEL 6427...

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