R, L, . . 20.
. 20
Z = R + jωL + 1/jω = R + j[ωL 1/(ωC)]. | (15) |
0 ∞ ∞ +∞. ω :
ωL 1/(ωC) = 0 |
ω = 1 / √ LC | (16) |
. , (15) R.
X = ωL 1/(ωC) = ρ (ω/ωo ωo/ω), ρ = √ LC = ωoL = 1/(ωoC). | (17) |
ρ , .
(17) (15)
Z = R (1 + jξ), ξ = Q (ω/ωo ωo/ω), Q = ρ / R = ωL / R = 1/(ωRC). | (18) |
ξ , Q , .
, . , L C , . .
u (jω) = ŮC / Ů1 = [1/(jωC)]/Z = j Q ω /[ω(1 + jξ)]. | (19) |
, - - :
u (ω) = Q ω /ω √(1 + ξ2), φ(ω) = - π/2 arctg ξ. | (20) |
Q >> 1. ∆ω = ω ω, .. ∆ω / ω << 1, ω≈ ω. -
ξ ≈ Q (2 ∆ω / ω), u (ω) = Q / √(1 + (Q 2 ∆ω / ω)2. | (21) |
ω = ω - ( Q ). . ω1 ω2
|
|
u (ω) = Q / √ 2. |
(21) ,
= ω / Q. | (22) |
.
. 21. , Ki = 1.
|
. 21
. , . 20. R, L, - - . , , .