Lec33DigTxRx

Lec33DigTxRx - ECE 488 RF Circuits and Systems Spring 2009...

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1 Digital Radio Receivers ECE 488 RF Circuits and Systems Spring 2009 Lecture # 33 2009/4/17 1 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: Transmitters My thanks to Analog Devices and Nokia for many of the original slides used here. Show and Tell Milled aluminum receiver 2 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: Digital versus Analog All digital circuits work in the analog domain! Many formerly RF “analog” functions are now being implemented in the digital domain: Filters 4 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: Mixers Local Oscillators Whole receivers Low level transmitter stages Why? The “bottom line”! Analog and Digital Paths to Baseband 5 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: IF-Sampling A/D Converters 6 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: Analog Devices parts. MSPS=Million Samples Per Second But how can the BW exceed the sample rate? Frequency Aliasing When you do not sample fast enough, Different frequencies look the same! ٭٭٭ So How do we salvage 7 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: So…How do we salvage the higher frequencies?
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2 How IF Sampling Works 8 Swartz 06/1/28 ECE 488 – RF Circuits and Systems – Spring 2009 Lecture 33: Provided the signal at 7f S is band-pass filtered to avoid mixing in other components! Replaces analog functions with digital equivalents: filters, synthesizers, and mixers Tolerances improved: Analog tolerances often vary by +/- 20% or more
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This note was uploaded on 07/09/2009 for the course ECE 4880 taught by Professor Swartz during the Spring '06 term at Cornell.

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Lec33DigTxRx - ECE 488 RF Circuits and Systems Spring 2009...

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