M niknejad and b boser 12 strong inversion noise in

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Unformatted text preview: sion • A more fundamental equation is derived [Tsividis] results in the above equation • In nonsaturation with Vds = 0, the device is a resistor so the thermal noise is given by EECS 240 Lecture 5: Noise © 2006 A. M. Niknejad and B. Boser 12 Strong Inversion Noise • In saturation, the drain current is given by • For a long channel model, you can substitute gm for the above factor. In practice the form involving inversion charge is more accurate and used by SPICE/BSIM. EECS 240 Lecture 5: Noise © 2006 A. M. Niknejad and B. Boser 13 Weak Inversion • The origin of noise in weak inversion is shot noise. So the result should be ~ 2qIDS. • But using the expression for inversion charge in weak inversion we get the same result! (similar to a diode) EECS 240 Lecture 5: Noise © 2006 A. M. Niknejad and B. Boser 14 Thermal Noise for Short Channels • Thermal...
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This note was uploaded on 03/18/2014 for the course EECS 240 taught by Professor Boser during the Spring '04 term at University of California, Berkeley.

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