California Polytechnic State University, San Luis Obispo - EE 308EE308_HW4_F2012solutions

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EE308 Analog Electronics and Integrated Circuits Assigned: 10/13/12 Due: 10/17/12 by 5:15pm (Turn in in class, slip under my door or turn in electronically. Electronic submissions due at 10pm) Thi... s assignment will show you one more ability of LTSpice, has you review non-idealities in MOSFETs, talk a little more about biasing (large signals), has you look at the definition of “small signal” and has you go through small signal analysis of a single transistor amplifier. 1. LTSpice: We’ll be talking about small signal values for the rest of the quarter. You can get LTSpice (or any other SPICE simulator for that matter) to give you small signal values. In the simulator tab there is an option for a “DC transfer” analysis. That is a simulation that gives you the small signal (perceived) Rout, small signal (perceived) Rin and the gain. Here’s an example of setting values using the window options available through LTSpice: (Using the models from last quarter – you should use the transistor model file you used in the last lab) This study source was downloaded by 100000819946675 from CourseHero.com on 04-06-2021 05:56:58 GMT -05:00 https://www.coursehero.com/file/8643618/EE308-HW4-F2012solutions/ This study resource was shared via CourseHero.comV(…) means look at the voltage of the wire or node named “…”. You should be able to find current by writing I(…) but my LTSpice wasn’t happy with that. If you want to write this out in a SPICE deck you’d write: .tf V(testV1) V1 Here are some examples that don’t have anything to do with the circuit shown above: .tf I(VLoad) Isource .tf V(Vout) Isource This will find the small signal Rin, Rout and the gain: [Show More]

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