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 - = d kT qv I average i d S d 1 exp 1 ( 29 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 = kT qV B q kT V DC 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 = + = ( 29 !...
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EE5602_9_ARFaMT_DIODES - Diode Circuits Types of Diodes...

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