lecture21 - Lecture #21 OUTLINE More diode applications The...

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Lecture 21, Slide 1 EECS40, Fall 2003 Prof. King Lecture #21 OUTLINE • More diode applications • The MOSFET Reference Reading Rabaey et al. – Chapter 3.3.1 Howe & Sodini – Chapter 4.1 – 4.3 Schwarz and Oldham – Chapter 13.4 Lecture 21, Slide 2 EECS40, Fall 2003 Prof. King Varactor Diode • Voltage-controlled capacitor – Used in oscillators and detectors ( e.g. FM demodulation circuits in your radios) – Response changes by tailoring the doping profile: () 0 2 1 φ >> + = D n D j V m n V C for where
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Lecture 21, Slide 3 EECS40, Fall 2003 Prof. King • Light incident on a pn junction generates electron-hole pairs • The minority carriers which are generated in the depletion region, and the minority carriers which are generated in the quasi-neutral regions and then diffuse into the depletion region, are swept across the junction by the electric field • This results in an additional component of current flowing in the diode: where I optical is proportional to the intensity of the light optical kT V q S D I e I I = ) 1 ( D Optoelectronic Diodes (cont’d) Lecture 21, Slide 4 EECS40, Fall 2003 Prof. King optical kT V q S D I e I I = ) 1 ( D Photovoltaic (Solar) Cell I D (A) V D (V) with incident light in the dark operating point
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Lecture 21, Slide 5
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lecture21 - Lecture #21 OUTLINE More diode applications The...

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