接收设计指导

zhouzaiyangt

【文件名】:07814@52RD_接收设计指导.rar
【格　式】:rar
【大　小】:476K
【简　介】:Abstract
This technical brief provides an overview of communication receiver sensitivity. One of the most important parameters in determining the overall performance of a communication system, receiver sensitivity translates directly into communication distance andreliability.Afewreceiverarchitectures  can offer dependable communication at low cost, if proper design procedures and trade-offs are implemented. RF amplifiers, mixers, and filters are common circuit building blocks for every architecture. System performance is tied to each individual block comprising the receiver. Each circuit generates noise that degrades reception of the desired signal. Understanding noise sources and the methods of minimizing degradation allows optimal design
trade-offs for a given cost. Circuit nonlinearity causes undesired signals tohinder the reception of desired signals. A low-noise system design typically does not produce the best linearity, and high linearity typically produces more noise. A thorough understanding of the receiver RF environment
can help your design achieve the proper specifications for optimal noise and linearity.
【目　录】:ntroduction...............................................................................................................................................4
Receiver Architectures..............................................................................................................................4
Homodyne (Zero IF) Receiver.........................................................................................................4
Heterodyne Receiver......................................................................................................................6
Access Methods and Modulation Schemes................................................................................................7
Access Methods.............................................................................................................................7
Modulation Schemes....................................................................................................................10
Receiver Building Blocks.........................................................................................................................16
Antenna.......................................................................................................................................17
Duplexers....................................................................................................................................18
Low-Noise Amplifier (LNA) ...........................................................................................................19
RF Filters.....................................................................................................................................19
Mixers..........................................................................................................................................20
Local Oscillator............................................................................................................................22
IF Filter........................................................................................................................................23
IF Amplifier ..................................................................................................................................23
Detectors.....................................................................................................................................24
Receiver Sensitivity.................................................................................................................................24
Noise of Two-Port Networks.........................................................................................................25
Noise Temperature.......................................................................................................................29
Noise Figure................................................................................................................................32
Cascaded Noise Temperature......................................................................................................37
Cascaded Noise Figure................................................................................................................40
Lossy Two-Port Noise Figure........................................................................................................42
Mixer Noise Figure.......................................................................................................................44
Minimum Detectable Signal..........................................................................................................46
Signal-to-Noise Ratio ...................................................................................................................48
Sensitivity....................................................................................................................................50
Phase Noise................................................................................................................................50
Receiver Nonlinear Performance.............................................................................................................51
Gain Compression .......................................................................................................................51
Intermodulation Distortion.............................................................................................................54
Dynamic Range...........................................................................................................................60
Blocking.......................................................................................................................................62
Spur-Free Dynamic Range...........................................................................................................63
Undesired Spurious Responses....................................................................................................64
Self-Quieters................................................................................................................................67
Receiver Design Trade-Offs....................................................................................................................67
Summary................................................................................................................................................70
Glossary.................................................................................................................................................70