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Engineering and Comp Sci Homework Help
Find voltage gain and input resistance for op-amp
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[QUOTE="ongxom, post: 4526394, member: 475784"] [h2]Homework Statement [/h2] Find the input resistances and voltage gains for those ideal op amps [ATTACH=full]164433[/ATTACH] [ATTACH=full]164434[/ATTACH] [h2]Homework Equations[/h2] [h2]The Attempt at a Solution[/h2] [B]The original inverting circuit look like this :[/B] [ATTACH=full]164435[/ATTACH] we already have the equations : input resistance = 10k voltage gain = -r2/r1 = -10 [B]For the first circuit :[/B] it still a inverting op amps, does the red marked 10k resistor get involved with input resistances ? I think it's not because it connected to the ground (virtual ?). R2 is 100k so the equation for voltage gain remains the same as the original circuit . [B]Second circuit:[/B] there is no current in red marked 10k resistor, input resistance is unchanged (10k), voltage gain remains (-10k) I find it is difficult to calculate using op amps characteristics, can I use voltage node method to find the voltage gain, which node should I choose. Are those ground connected resistor have no effect on the circuit input resistances and voltage gain at all ? [/QUOTE]
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Find voltage gain and input resistance for op-amp
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