Part 1 : System Design and Specification

Speaker by A-wei ( 許智威 )Email : awei@ieee.org ; 0927628289 ;

103 年 2 學期教學資訊及各週課程內容表及教授進度計畫 :https://hackpad.com/ep/pad/static/x165wDtuZpb

https://hackpad.com/RF-Circuit-Design-for-Systems-4D9090-6M9wjrIA2aC

Receiver ArchitectureRF AP noise figure,Gain, intercept point

Isolate Filter 1 and Filter 2

Filter #2 is to attenuate Rx (a).spurious response frequencies, (b).attenuate Direct IF frequency pickup, (c ).Attenuate noise at the Image frequency or by (d).

RF AP second harmonic of Second-order intercept point.

Mixer Parameters

Image noise and wideband LO noise contributors to overall noise figure degradation

超外差接收機 Receiver (Rx)

接收機系統分析 _03

接收機系統分析

接收機系統分析

接收機系統分析

接收機系統分析

圖解超外差 AM 接收機系統頻譜圖 _01

圖解超外差 AM 接收機系統頻譜圖 _02

波封檢波器解調變 _09

Image Frequency noise 干擾 _01

Image Frequency noise 干擾 _02

Image Frequency noise 干擾 _03

Receiver Design

• Radio frequency (RF) receiver performance specifications in common usage are listed below :

1. Receiver sensitivity : Receiver sensitivity quantifies the ability of a receiver to respond to weak signal levels. 接收機用來量化接收電磁波的弱電訊號之參考值 , for analog Rx is maximum RF level to ensure a certain demodulated S/N ratio, While digital Rx use maximum bit error rate (BER) as a measure of performance.

2. Receiver selectivity : (Like a MIMO switching,) 通道的選擇性

Receiver Design• Radio frequency (RF) receiver performance specifications in common usage are listed below :3. Spurious response rejection : This is a very interesting specification for which no clear definition seems to exist. Note definition 1.0: Spurious rejection is the ratio of a particular out of band frequency signal level required to produce a specified output to the desired signal level to produce the same output. Definition 2.0: " All superheterodyne receivers have a potential for responding to frequencies other than the desired frequency channel. This needs to be minimized by designing in spurious response rejection by proper choice of the IF frequency and use of RF filters. 70 to 100 dB is achieveable in practical receivers." Definition 3.0: Ratio of desired signal to the total of all spurious signals at an offset of channel spacing in dB. What are these spurious responses being considered? A sample of these signals is described below:(1) Image frequency/ frequencies. (2) Half - IF.(3) Straight IF pickup.(4) High order spurs result from combinations of harmonics ( m,n) which result in spurious responses so close to the desired frequency response that they cannot be filtered out.(5) A whole family of spurious responses of type ( 1 x n) is the n x LO spurs which can be troublesome if the RF front end has return responses or re-resonances.(6) Second image in dual conversion receivers.(7) Spurious signals present on the LO signal itself. (8) Transmitted signal in half duplex radios assuming the role of a LO.

These responses are difficult to measure because of signal generator wideband noise.

Receiver Design-Intermodulation rejection :

4. Intermodulation rejection :Intermodulation (IM) or intermodulation distortion (IMD) is the amplitude modulation of signalscontaining two or more different frequencies in a system with nonlinearities.互調（ IM ）或相互調變失真（ IMD ）是含有與非線性一個系統中的兩個或更多個不同頻率的信號的振幅調變。每個頻率分量之間的互調將形成附加信號頻率是不只是在任一諧波頻率（整數倍），而且在原來的頻率的和與差的頻率，並在這些和與差的頻率的倍數。

5.

Receiver Design - Receiver self-quieting

Receiver Architecture

課程名單

參考• RF Circuit Design Slide show net : http://

www.slideshare.net/matirozen/rf-reciver-design-1802833?related=2• Slideshart : http://www.slideshare.net/upload Part1: http://www.slideshare.net/AweiHsu/edit_my_uploads