# hw3 - collector current I o and driven from a source with...

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1 UNIVERSITY OF CALIFORNIA College of Engineering Department of Electrical Engineering and Computer Sciences Problem Set 3 EECS 240 B. E. BOSER Due Tuesday, March 2, 2004 SPRING 2004 1. Derive an expression for the input referred noise of an NMOS common-source amplifier M1 with PMOS load M2. Assume M1 and M2 are both in saturation and that a capacitor CL dominates the load at the output. Specify the result as the noise from M1 multiplied by a factor that is a function of the V* of the two transistors. Analysis of flicker noise is optional (but interesting also!). What’s the conclusion? Why will you remember this result forever (or at least as long as you design circuits)? 2. A MOS common source and BJT common emitter stage are biased with the same drain and
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Unformatted text preview: collector current I o and driven from a source with output resistance R s . Calculate the value of R s for which the input referred noise from the MOS and BJT amplifier are equal. When is the BJT advantageous? Another memorable result! Parameters: I o =100 A, V*=200mV, =1, =100. Ignore flicker noise. 3. In the circuit below, the switch S1 is first closed and then opened abruptly, disconnecting C L from the amplifier. Calculate an exact expression for the variance of the noise voltage sampled onto C L after opening the switch. The result should be a function of R s , g m1 , R L , C L , and k B T. Neglect flicker noise, the output conductance of M1, and all capacitors except C L ....
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