lec18

lec18 - +-EE3113_L18 5 PIN diode P + N + I Intrinsic (low...

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EE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2003 LECTURE 18 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 2003, R. Ludwig Copyright, 1998 © R. Ludwig
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EE3113_L18 2 RF diodes • Key equation: Schottky diode equation • diode analysis involves typically three models: – DC model – small signal AC model – small signal RF model ) 1 ( 0 = T A nV V e I I
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EE3113_L18 3 • Small signal ac model – Dynamic resistance (junction resistance) d Q d Q A i I I v V V + = + = 0 I I nV R Q T j + = Note: dynamic resistance depends on bias and is strongly temperature dependent
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EE3113_L18 4 Small signal RF model • Schottky diode – metal-n semiconductor – majority carrier only + + + Applications: mixers, detectors, rectifiers
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Unformatted text preview: +-EE3113_L18 5 PIN diode P + N + I Intrinsic (low doped) n, p, or pn layer Major property: Variable resistance behavior Forward bias: Isolation state Zero bias: Insertion loss state Applications: attenuating, switching, modulating, limiting, and phase shifting. EE3113_L18 6 Electric behavior of PIN diode Forward bias (low resistance) Reverse bias (capacitance) Circuit application EE3113_L18 7 PIN Application: Tuning/detuning Resonator RF Source Detuning Source Filter Matching Detuning RF Decoupling Body Coil Bias Tee Magnet Surface Coil S-1 S-2 RF-Transmitter SysCon RF-Receiver Tx/Rx Mode Control Signal Interface (optional)...
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lec18 - +-EE3113_L18 5 PIN diode P + N + I Intrinsic (low...

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