RF Circuit Design for OrCAD PCBA

1. Part 3 : 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/RF-Circuit-Design-for-Systems-4D9090-6M9wjrIA2aC

2. 接收機系統分析_03

3. Receiver Architecture
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 PA
second harmonic of Second-order intercept point.
RF In : 167.56MHz
IF : 146.16MHz
Second IF : 455kHz
First IF : 21.45MHz
Second LO = 20.945MHz
First LO = 146.16MHz
146.16MHz + 21.4MHz =
167.56MHz
LO = fc + fIF

4. Self-Quieting

5. Receiver Sensitivity

6. Receiver Intercept Point
• Intercept point (截止點) : 用來對一個接收機系統電路進行線性分
析比較的參考方式
• Second-Order Intercept point

7. Receiver Intercept Point – ½ IF rejection

8. Receiver Intercept Point – Takeover Gain

9. Receiver Intercept Point – IP2 Calculation

10. Receiver Intercept Point (IP)– Third-Oder IP
• ?

11. Receiver Selectivity

12. Spectral purity of LO signal