EE 435 Lect 43 Spring 2010

EE 435 Lect 43 Spring 2010 - EE 435 Lecture 43 Integrated...

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EE 435 Lecture 43 Integrators OTA-C Filters Switched-Capacitor Filters Voltage Amplifiers Integrated Filters and Amplifiers
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Temperature Sensors V DD V O1 (T) V O2 (T) M 1 M 2 M 3 M 5 M 4 (a) V 3 21 12 01 Tn 23 32 WL 1 MW L VV 1 W L MW L   = +−  02 Tn W L MW L 1 W L MW L = Tn Tn0 T γ = MOS-Based Temperature Sensors .• •• Review from last lecture .•
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Some standard types of filters ω ( ) Tj ω 1 ω ( ) ω 1 ω ( ) ω 1 Lowpass Bandpass Highpass ω ( ) T j ω Requirements can be very specific .• •• Review from last lecture .•
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Requirements can be very stringent ω ( ) T j ω ω 01 ω 02 Band edges may need to be controlled to 0.1% or better in some applications .• •• Review from last lecture .•
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Typical Filter Implementation T 1 (s) Biquad T 2 (s) Biquad T k (s) Biquad V OUT V IN T m (s) Biquad T 0 (s) First- Order I 1 (s) Integrator I 2 (s) Integrator I 3 (s) Integrator I 4 (s) Integrator I k (s) Integrator V IN V OUT I k-1 (s) Integrator a 2 a 1 Biquads often LP or BP .• •• Review from last lecture .•
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Typical Biquad Implementation (Two-Integrator Loop) ( ) 2 0 22 0 0 I Ts s + I s+I α = 0 I s 0 I s + X IN X OUT α Accurate control of I 0 and α is essential for building most filters !
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Two-integrator Loop ( ) 0 22 0 0 sI Ts s + I s+I α = 0 I s 0 I s + X IN X OUT α Accurate control of I 0 and α is essential for building most filters !
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Alternate two-integrator loop 0 0 I s+ αI 0 I s + X IN X OUT X OUT1 ( ) 2 0 22 0 0 I Ts s + I s+I α = ( ) 0 1 0 0 sI s + I s+I = Accurate control of I 0 and α is essential for building most filters !
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Alternate two-integrator loop 0 0 I s+ αI 0 I s + X IN X OUT 1 ( ) 2 0 22 0 0 I Ts s + I s+I α = Accurate control of I 0 and α is essential for building most filters !
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Observation: • The integrator is the key building block in most filters • Accuracy of I 0 and α is important !
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EE 435 Lect 43 Spring 2010 - EE 435 Lecture 43 Integrated...

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