參數(shù)資料
型號(hào)： MC145225
廠商： Motorola, Inc.
英文描述： Dual PLL Frequency Synthesizers With DACs and Voltage Multipliers(帶DACs和電壓乘法器的雙PLL頻率合成器)
中文描述： 雙鎖相環(huán)頻率合成器與DAC和電壓倍增器（帶數(shù)模轉(zhuǎn)換器和電壓乘法器的雙鎖相環(huán)頻率合成器）
文件頁數(shù)： 33/71頁
文件大小： 906K
代理商： MC145225
MC145225 MC145230
33
MOTOROLA RF/IF DEVICE DATA
Rs can be ignored. The value for C3 and L2 are chosen so
that
Xc3 = Xl2
when C3 is adjusted to approximately half its maximum
capacitance. At this setting, the combination produces a zero
change in the overtone frequency. If C3 is then chosen so
that Xc3 at minimum capacitance is
[Xc3(max)] – Xl2 >=
Ff (ppm) Z(crystal)
and L2 is approximately
Xc3(max)
XI2 =
2
then
Xc3(max) >= 2[
Ff (ppm)] Z(crystal)
and
Xc(max)
4
Xc(min)=
This results in an adjustable change in the operating
frequency of +[
Ff (ppm)] and –[
Ff (ppm)]/2. If ratios nearer
to 1:1 are used for Xc3(max) and Xl2, the tuning range will be
skewed with a wider –[
Ff (ppm)] but at the expense of less
adjustability over the +[
Ff (ppm)] range.
Figure 28. Colpitts Oscillator Configured for Overtone Operation
C3
C2
C1
R1
R2
Q1
M2
M1
+V
Oscb
Osce
Frequency Synthesizer
I1
200/800
μ
A
X1
C4
L1
L2
0
0
0
0
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