EE 435 Lect 42 Spring 2010

EE 435 Lect 42 Spring 2010 - EE 435 Lecture 42 Temperature...

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EE 435 Lecture 42 Integrators OTA-C Filters Switched-Capacitor Filters Voltage Amplifiers Integrated Filters and Amplifiers Temperature Sensors
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Standard Approach to Building Voltage References Negative Temperature Coefficient (NTC) K Positive Temperature Coefficient (PTC) X OUT X N X P Pick K so that at some temperature T 0 , ( ) 0 T KX X 0 T T P N = + = P N OUT KX X X + = .• •• Review from last lecture .•
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First Bandgap Reference (and still widely used!) V DD V REF R 1 R 2 R 3 R 4 Q 1 Q 2 TlnT c T b a V 1 1 1 REF + + = ( ) 1 m q kT V V INF G0 REF + = Bandgap Voltage Source 1.237000 1.237500 1.238000 1.238500 1.239000 1.239500 1.240000 200 250 300 350 400 Temperature in C VREF VGO 1.206 TO 300 VBEO2 0.65 m-1 1.3 k/q 8.61E-05 .• •• Review from last lecture .•
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TC of Bandgap Reference (+/- ppm/C) 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 0 50 100 150 200 250 Temperature Range TC .• •• Review from last lecture .•
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Bamba Bandgap Reference D 1 D 2 R 1 R 2 M 1 M 2 M 3 R 4 V REF θ V DD V D1 R 0 V D2 I 1 I 2 I D1 I D2 I 3 BE1 R1 1 V I= R R2 R1 I =I BE R0 0 V I R = 2 I 2 R0 R2 I =I +I 32
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This note was uploaded on 01/31/2012 for the course EE 345 taught by Professor Geiger during the Fall '11 term at Iowa State.

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EE 435 Lect 42 Spring 2010 - EE 435 Lecture 42 Temperature...

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