Transcription of Basic Analog Electronic Circuits Dr. Lynn Fuller
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Basic Analog Electronic Circuits Dr. Lynn Fuller
Page 111111111 Page 2 Page 3 Page 4 This is the CMOS op amp that we will build in lab. Look carefully at the schematic and identifythe current sources, reference current, differential amplifier, active loads, common source 2ndstage with active load and scope probe. (note: MEG works in spice but M is milliand m is also milli) Note the current source for the 2ndstage is different than M8 in that R3 will make the current 5 Start with the DC analysis. In LTSPICEthe .op command does the DC analysis and lists all the node voltages and branch currents in a table after running the simulation. Some of the results in the table are given here. The reference current I(R2) is mA and is matched with the current source IM8=IEE= IEE splits in half for the diff amp transistors giving mA each. The current in the 2ndstage is The DC output offset voltage is 40mV which is close to zero as 6 One way to get the voltage gain (the otheris to input sine wave) is to do a DC sweep near zero volts.
© February 15, 2017 Dr. Lynn Fuller, Professor Rochester Institute of Technology Microelectronic Engineering Basic Analog Electronic Circuits Page 1
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