lab3sample_09 - out V of both mirrors for two different...

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1 ECE 315: Lab 3 Measurement Samples Spring 2009 Experiment 1: Input Characteristics Semilog plot showing in V as a function of in I , similar to the one shown below, for a simple n MOS current mirror and a p MOS one. For each mirror, they should show both measured values of in V as in I is swept and measured values of in I as in V is swept. Comments on how the input current-voltage characteristic do not change if we sweep the current and measure the voltage or if we sweep the voltage and measure the current. Experiment 2: Current Transfer Characteristics A loglog plot showing out I as a function of in I for both types of mirrors, such as the one shown below, as in I changes from weak to strong inversion along with theoretical power-law fits. Comments on how closely each current mirror behaves as predicted in the prelab. For the data shown, the simple n MOS mirror is much closer to the ideal than is the p MOS mirror.
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2 Experiment 3: Output Characteristics A single plot showing current gain as a function of
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Unformatted text preview: out V of both mirrors for two different input currents, one in weak or moderate inversion and one in strong inversion, similar to the ones shown below. • Comments on whether the current gain is ever unity and, if so, how in V and out V are related at this point. For the n MOS mirror, the random current-gain error due to mismatch will probably be greater than the systematic current-gain error due to the Early effect, so that the current gain may or may not go through unity. For the p MOS mirror, the systematic gain error is probably larger than the random one due to mismatch, so the current gain may go through unity. If there were no random error, in out V V = at this point. • Comments on by how much the current gain changes as out V changes. For an n MOS mirror, the gain will not change by as much as it will for a p MOS mirror, because these p MOS transistors have a larger Early effect than do the n MOS ones....
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lab3sample_09 - out V of both mirrors for two different...

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