资料介绍
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RLC L- π T- >N¨W >a¨W V ¨W
Lecture 2, Sept. 24, 2004
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1. Ch. 4 of Thomas Lee’s book, 1st Ed.
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RLC
One characteristic of RF circuits is the relatively large ratio of passive to active components. RLC networks are used in RF circuits to match or otherwise modify impedances, which is important for ecient power transfer. Parallel RLC tank. The admittance is
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Y = G + jωC +
1 1 = G + j ωC jωL ωL
(1)
Resonant frequency 1 1 (2) = 0 = ω0 = √ ωL LC L = 1 nH and C = 1 pF resonate at 5 GHz. At resonance, the branch current in L and C is large, leading to the application of downward impedance transformation. Quality factor, Q energy stored Q≡ω (3) average power dissipated Note that Q is dimensionless. For RLC tank at resonance, 1 Etot = C (IpkR)2 (
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