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M
10MHz to 1050MHz Integrated
RF Osc illator with Buffered Outputs
_______________________________________________________________________________________
9
Example Calc ulation
According to the electrical model shown in Figure 5, the
resonance frequency can be calculated as:
[Equation 1]
R
n
, the negative real impedance, is set by C3 and C4
and is approximately:
[Equation 2]
2
π
where g
m
= 0.018mS.
Using the circuit model of Figure 5, the following exam-
ple describes the design of an oscillator centered at
900MHz.
Choose: L1 = 5nH ±10%
Q = 140
Calculate R
p
= Q x 2
π
x f x L1
Using Equation 1, solve for varactor capacitance (C
D1
).
C
D1
is the capacitance of the varactor when the volt-
age applied to the varactor is approximately at half-
supply (the center of the varactor’s capacitance range).
Assume the following values:
C
STRAY
= 2.7pF, C17 = 1.5pF, C6 = 1.5pF, C5 = 1.5pF,
C3 = 2.7pF, and C4 = 1pF.
The value of C
STRAY
was based on approximate perfor-
mance of the MAX2620 EV kit. Values of C3 and C4 are
chosen to minimize R
n
(Equation 2) while not loading
the resonant circuit with excessive capacitance.
The varactor’s capacitance range should allow for the
desired tuning range. Across the tuning frequency
range, ensure that R
p
< 1/2
R
n
.
The MAX2620’s oscillator is optimized for low-phase-
noise operation. Achieving lowest phase-noise charac-
teristics requires the use of high-Q (quality factor)
components such as ceramic transmission-line type
resonators or high-Q inductors. Also, keep C5 and C17
R
g
fC
fC
n
m
=
1
3
1
2
4
π
V
CC
VCC1
TANK
FDBK
SHDN
8
7
6
5
OUT
VCC2
GND
OUT
1
2
3
4
V
CC
V
CC
V
CC
10
51
0.01
μ
F
10
μ
H
0.01
μ
F
OUT
30pF
120pF
120pF
0.01
μ
F
0.01
μ
F
0.01
μ
F
27pF
0.01
μ
F
SHDN
OUT
MAX2620
X = STATEK AT-3004 10MHz
FUNDAMENTAL MODE CRYSTAL SURFACE MOUNT
C
LOAD
= 20pF
Figure 4. 10MHz Crystal Oscillator
f
1
2
L1 C
+ C
x C
+ C
C
C
C
C
C
C
C
C
C
C
STRAY
17
D1
17
D1
3
03
4
04
3
03
4
04
=
+
+
+
+
(
)
+
+
+
(
)
π
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX2620 | 10MHz to 1050MHz Integrated RF Oscillator with Buffered Outputs |
| MAX2642EVKIT | Evaluation Kits |
| MAX2643EVKIT | Evaluation Kits |
| MAX2643EXT-T | 900MHz SiGe, High IP3, Low-Noise Amplifiers |
| MAX2642 | Hex inverters 14-SOIC 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX2620EUA+ | 功能描述:VCO振蕩器 10MHz - 1050MHz RF Oscillator RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| MAX2620EUA+T | 功能描述:VCO振蕩器 10MHz - 1050MHz RF Oscillator RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| MAX2620EUA-T | 功能描述:VCO振蕩器 10MHz - 1050MHz RF Oscillator RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
| MAX2620EVKIT | 功能描述:時鐘和定時器開發(fā)工具 MAX2620 Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| MAX2622EUA | 功能描述:VCO振蕩器 855MHz - 881MHz Mono V Ctrld Osc RoHS:否 制造商:Exar 封裝 / 箱體:SOIC-14 頻率:300 kHz 負載電容: 封裝:Reel 電源電壓:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作溫度:0 C 最大工作溫度:+ 70 C |
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