Lect20_Transmitter Arch

Lect20_Transmitter Arch - ECE 620 Introduction to RF...

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ECE 620 Introduction to RF Integrated Circuits Prof. Waleed Khalil Lecture Transmitters Architecture 20 1
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Outline Overview Specifications Architecture SSB vs. DSB Heterodyne TX DC TX 2
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Transmitter Overview (1/2) 3 The function of the transmitter is to produces an RF signal modulated by the transmitted data Modulation Up-conversion Power amplification Linearity and Filtering are the two main issues impacting the transmitter Need to provide enough output power w/o overpowering nearby users (i.e. channels) PGA RF LO IF RF LO IF sin(2 π f LO t) cos(2 π f LO t) 90º I Q PA D/A PGA D/A . dt φ k (t) Data Sequence 0/1 Amp Freq. Pulse Shaping Filter a I cos() a Q sin() a k (t) Digital Baseband (MODEM) Analog Baseband/Front-end AFE RF Front-end Switch/ Duplexer RX
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Transmitter Overview (2/2) 4 Digital baseband Information bits are digitally filtered to shape the transmitted spectrum Signal is converted to amplitude and frequency ( phase) symbols Analog baseband (AFE) D/A converts the signal into analog domain LPF is required to attenuate D/A sampling images/sinc response
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Lect20_Transmitter Arch - ECE 620 Introduction to RF...

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