资料介绍
Lecture2Advanced RFIC Design ELEN 359A Lecture 2: Passive Circuits
Instructor: Dr. Allen A Sweet
Copy Right 2004
Passive Circuit Types
Low Pass Filters (LPF) High Pass Filters (HPF) Band Pass Filters (BPF) Differential Circuits Phase Shifters Splitters/Combiners Couplers
Copy Right 2004
Single Section “T” LPF
Copy Right 2004
Basic Design Equations: Single Section “T” Low Pass Network
Z0=SQR(L/C) Fc=1/piZ0C L=SQ(Z0)C Time Delay=SQR(LC) Phase Shift(in degrees)=360F(Time Delay) Fh=50%Fc Roll off is about 10 dB per octave per section Phase shift is about 90 degrees at Fh per section
Copy Right 2004
Design Example of a Single Section LPF
Assume Fh=3 GHz, then Fc=6 GHz Assume Z0=50 Ohms C=1/pi(50)(6 GHz)=1.06 pF L=(50)(50)(1.06E-12)=2.65 nH Time Delay=SQR(2.65E-9)(1.06E-12)