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Unformatted text preview: voltage input, varied in a circuit? — By varying the current I ABC . (d) Draw an op amp circuit that can be used to convert the current output of the transconductance op amp into a voltage while presenting a virtual ground load on the transconductance op amp. Give the equation for the voltage output of the circuit as a function of the current output of the transconductance op amp. — This is in the class notes. 2. (a) Assume all current mirrors are perfect and neglect the Early e f ect. Adjacent to all unlabeled current arrows, label the current in terms of i c 1 and solve for i o ( sc ) in terms of i c 1 . — This is in the class notes. In addition, the notes give the dc currents in terms of I ABC . It was optional on the quiz to include them because they cancel at i o ( sc ) . (b) If the Early e f ect is neglected, what is i o ( sc ) in terms of v i 1 and v i 2 ? i o ( sc ) = v i 1 − v i 2 2 r e or = g m 2 ( v i 1 − v i 2 ) r e = 2 V T I ABC g m = I ABC 2 V T 1 2...
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- Summer '08
- Resistor, Current Source, Analog Circuits, transconductance op amp