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參數(shù)資料
| 型號： | LMX3161VBH |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Single Chip Radio Transceiver |
| 中文描述： | TELECOM, CORDLESS, SUPPORT CIRCUIT, PQFP48 |
| 封裝： | 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, QFP-48 |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 212K |
| 代理商： | LMX3161VBH |
Loop Filter Design Consideration
Loop Gain Equations
A linear control system model of the phase feedback for a
PLL in the locked state is shown in Figure 2 The open loop
gain is the product of the phase comparator gain (K
), the
VCO gain (K
/s), and the loop filter gain Z(s) divided by the
gain of the feedback counter modulus (N). The passive loop
filter configuration used is displayed in Figure 3 while the
complex impedance of the filter is given in Equation (2)
PASSIVE LOOP FILTER
Open loop gain = H(s) G(s) =
θ
i/
θ
e = K
φ
Z(s)K
VCO
/Ns
(1)
(2)
The time constants which determine the pole and zero fre-
quencies of the filter transfer function can be defined as
(3)
and
T2 = R2
C2
(4)
The 3rd order PLL Open Loop Gain can be calculated in
terms of frequency,
ω
, the filter time constants T1 and T2,
and the design constants K
φ
, K
vco
, and N.
(5)
From Equations (3), (4) we can see that the phase term will
be dependent on the single pole and zero such that the
phase margin is determined in Equation (6)
φ
(
ω
) = tan
1
(
ω
T 2) tan
1
(
ω
T 1) + 180
(6)
DS012815-8
FIGURE 1. Conventional PLL Architecture
DS012815-9
FIGURE 2. PLL Linear Model
DS012815-10
FIGURE 3. Passive Loop Filter
L
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| LMX3161VBHX | 功能描述:IC TXRX SINGL CHIP RADIO 48-LQFP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LMX3162 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single Chip Radio Transceiver |
| LMX3162VBH | 制造商:National Semiconductor Corporation 功能描述:-LIFETIME BUYS TIL 06/03 制造商:OC White Company 功能描述:Single Chip Radio Transceiver 48-Pin MQFP T/R |
| LMX3162VBHX | 功能描述:IC TXRX SINGL CHIP RADIO 48-LQFP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
| LMX321 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Single/Dual/Quad, General-Purpose, Low-Voltage, Rail-to-Rail Output Op Amps |
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