Lect18_Receiver Arch III

Lect18_Receiver Arch III - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Receivers Architecture III 18 1
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Outline Baseband Signal Processing Drawbacks of Homodyne Receivers Image Reject Receivers 2
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Homodyne Receiver: Baseband Architecture High linearity/low noise filter Highest linearity filter and high linearity PGA High dynamic range ADC 3
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DC Offset 4 + = × ) 4 cos( 2 2 ) 2 cos( ) 2 cos( t f A A A A t f A t f A c LO RF LO RF c LO c RF π DC Offset LP Filtered DC offset depends on LO and RF power levels Small DC offset (e.g. few mVs) can saturate PGA A RF cos(2 π f c t) A LO cos(2 π f c t) PGA RF LO IF ADC LPF DC offset
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Self-Mixing LO Leakage: Coupling of LO signal to RF port of mixer Capacitive and substrate coupling Crosstalk inside mixer ports High LO power can result in large DC offset 5 High power blocker can leak thru LNA and couple to mixer LO port PGA RF LO IF ADC LPF LNA A iso PGA RF LO IF ADC LPF LNA f c Blocker A iso
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DC Offset Correction 6 Capacitive Coupling Negative Feedback
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Lect18_Receiver Arch III - ECE 620 Introduction to RF...

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