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參數(shù)資料
| 型號(hào)： | mc145193 |
| 廠商： | Motorola, Inc. |
| 英文描述： | PT06A SERIES (MS3116) STRAIGHT PLUGS, STRAIGHT BODY STYLE, SOLDER TERMINATION, 14 SHELL SIZE, 14-5 INSERT ARRANGEMENT, PLUG GENDER, 5 CONTACTS |
| 中文描述： | 1.1 GHz PLL頻率合成器 |
| 文件頁數(shù)： | 19/24頁 |
| 文件大小： | 240K |
| 代理商： | MC145193 |
MC145193
19
MOTOROLA WIRELESS SEMICONDUCTOR
SOLUTIONS – RF AND IF DEVICE DATA
F(s) =
Assumng Gain A is very large, then:
Z(s) =
ζ
=
ω
n =
PHASE–LOCKED LOOP — LOW–PASS FILTER DESIGN
(B)
A
C
R2
C
VCO
(A)
φ
R
φ
V
R1
R1
R2
K
φ
KVCO
NC
R
2
sC
ω
n =
K
φ
KVCO
NCR1
ζ
=
ω
nR2C
2
R2sC + 1
R1sC
NOTE:
For (B), R1 is frequently split into two series resistors; each resistor is equal to R1 divided by 2. A capacitor CC is then placed from the midpoint
to ground to further filter the error pulses. The value of CC should be such that the corner frequency of this network does not significantly
affect
ω
n.
DEFINITIONS:
N = Total Division Ratio in Feedback Loop
K
φ
(Phase Detector Gain) = IPDout/2
π
amps per radian for PDout
K
φ
(Phase Detector Gain) = VPD/2
π
volts per radian for
φ
V and
φ
R
KVCO (VCO Transfer Function) =
2
π
fVCO
VVCO
For a nominal design starting point, the user might consider a damping factor
ζ
≈
0.7 and a natural loop frequency
ω
n
≈
(2
π
fR/50) where fR
is the frequency at the phase detector input. Larger
ω
n values result in faster loop lock times and, for similar sideband filtering, higher fR–related
VCO sidebands.
Either loop filter (A) or (B) is frequently followed by additional sideband filtering to further attenuate fR–related VCO sidebands. This additional
filtering may be active or passive.
RECOMMENDED READING:
Gardner, Floyd M., Phaselock Techniques (second edition).New York, Wiley–Interscience, 1979.
Manassewitsch, Vadim, Frequency Synthesizers: Theory and Design (second edition). New York, Wiley–Interscience, 1980.
Blanchard, Alain, Phase–Locked Loops: Application to Coherent Receiver Design.New York, Wiley–Interscience, 1976.
Egan, William F., Frequency Synthesis by Phase Lock. New York, Wiley–Interscience, 1981.
Rohde, Ulrich L., Digital PLL Frequency Synthesizers Theory and Design. Englewood Cliffs, NJ, Prentice–Hall, 1983.
Berlin, Howard M., Design of Phase–Locked Loop Circuits, with Experiments.Indianapolis, Howard W. Sams and Co., 1978.
Kinley, Harold, The PLL Synthesizer Cookbook.Blue Ridge Summit, PA, Tab Books, 1980.
Seidman, Arthur H., Integrated Circuits Applications Handbook Chapter 17, pp. 538–586. New York, John Wiley & Sons.
Fadrhons, Jan, “Design and Analyze PLLs on a Programmable Calculator,” EDN March 5, 1980.
AN535, Phase–Locked Loop Design Fundamentals, Motorola Semiconductor Products, Inc., 1970.
AR254, Phase–Locked Loop Design Articles, Motorola Semiconductor Products, Inc., Reprinted with permission from Electronic Design,
1987.
AN1253, An Improved PLL Design Method Without
ω
n and
ζ
, Motorola Semiconductor Products, Inc., 1995.
–
+
KVCOC
N
K
φ
1 + sRC
NOTE:
For (A), using K
φ
in amps per radian with the filter’s impedance transfer function, Z(s), maintains units of volts per radian for the detector/filter
combination. Additional sideband filtering can be accomplished by adding a capacitor C
′
across R. The corner
ω
c = 1/RC
′
should be chosen
such that
ω
n is not significantly affected.
C
VCO
R
PDout
radians per volt
=
ω
nRC
2
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