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Lecture 11

Lecture 11 - Lecture 11 OUTLINE Current Mirrors Reading...

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1 Lecture 11 – Slide 1 EE105, Fall 2013 Prof. Ming C. Wu Lecture 11 § OUTLINE Current Mirrors § Reading: Chapter 9.2 Lecture 11 – Slide 2 EE105, Fall 2013 Prof. Ming C. Wu Temperature and Supply-Voltage Dependence of Bias Current § Circuits should be designed to operate properly over a range of supply voltages and temperatures. § For the biasing scheme shown below, I 1 depends on the temperature as well as the supply voltage, since V T and I S depend on temperature. CC BE V V S V R R R V e I I T BE 2 1 2 / 1 + =
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2 Lecture 11 – Slide 3 EE105, Fall 2013 Prof. Ming C. Wu Concept of a Current Mirror § Circuit designs to provide a supply- and temperature- independent current exist, but require many transistors to implement. à golden current source § A current mirror is used to replicate the current from a golden current source to other locations. Lecture 11 – Slide 4 EE105, Fall 2013 Prof. Ming C. Wu Current’Mirror’Circuitry’ § Diode-connected’ Q REF ’produces’an’output’voltage’ V X’ that’forces’ I copy1’ to’be’equal’to’ I REF ,’if’ Q 1’ is’[email protected] to’ Q REF .’ V X = V T ln I copy 1
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Lecture 11 - Lecture 11 OUTLINE Current Mirrors Reading...

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