EE5602_9_ARFaMT_DIODES

EE5602_9_ARFaMT_DIODES - Diode Circuits • Types of Diodes...

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Unformatted text preview: Diode Circuits • Types of Diodes • Detector – Square law – Envelope • Mixer – Single ended – Doubly balanced • Control – Switches – Attenuators – Phase shifters Diode Detector • Diode equation • Integrating over one RF cycle gives the average current • Where v d is the diode voltage given by - = 1 exp kT qv I i d S d ( 29 - = ∫ τ τ τ d kT qv I average i d S d 1 exp 1 ( 29 π ϖ ϖ μ 2 , cos = + = t t V V v DC d • Detector usually fed to a high impedance amplifier • Where B is the modified Bessel function • Simplifying and solving for the detected voltage - × = = 1 exp kT qV B kT qV I i DC S d μ = kT qV B q kT V DC μ ln • For low level signals the modified Bessel function is • Taking the first 2 terms gives • For large signals (envelope) ( 29 ! 4 4 1 ln 2 2 2 2 2 law square kT qV T k V q q kT V DC μ μ = + = ( 29 !...
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This note was uploaded on 01/11/2011 for the course EE 5602 taught by Professor Wingshingchan during the Spring '10 term at City University of Hong Kong.

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EE5602_9_ARFaMT_DIODES - Diode Circuits • Types of Diodes...

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