EE3113_A2009_L18

EE3113_A2009_L18 - Schottky diode metal-n semiconductor...

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ECE 3113 INTRODUCTION TO RF CIRCUIT DESIGN Lecture Notes for A-term 2009 LECTURE 18 Prof. R. Ludwig Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester, MA 01609 copyright © 2009, R. Ludwig Copyright, 1998 © R. Ludwig
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ECE3113_L18 2 Objectives • What is the small signal AC model of a diode? • What is the difference between a Schottky and a PIN diode? • What are some circuit implementations of diodes?
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ECE3113_L18 3 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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ECE3113_L18 4 • 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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ECE3113_L18 5 Small signal RF model
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Unformatted text preview: Schottky diode metal-n semiconductor majority carrier only + + + Applications: mixers, detectors, rectifiers +-ECE3113_L18 6 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. ECE3113_L18 7 Electric behavior of PIN diode Forward bias (low resistance) Reverse bias (capacitance) Circuit application ECE3113_L18 8 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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This note was uploaded on 10/13/2009 for the course ECE 3113 taught by Professor Ludwig during the Spring '09 term at WPI.

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EE3113_A2009_L18 - Schottky diode metal-n semiconductor...

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