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10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
R S + jX S
TEST PORT
MEASUREMENT
C5
(FIGURE 1)
MAX2620
C17
C3
C 03
2.4pF
R n
C STRAY
PC BOARD
PARASITICS
C D1
VARACTOR+
COUPLING
L1
R p
INDUCTOR
OR
C6
C4
C 04
2.4pF
CERAMIC
RESONATOR
RESONANT TANK MODEL
Figure 5. Electrical Model of MAX2620 Circuit
resonators or high-Q inductors. Also, keep C5 and C17
(see the Typical Operating Circuit ) as small a value as
possible while still maintaining desired frequency and
tuning range to maximize loaded Q.
There are many good references on the topic of oscilla-
tor design. An excellent reference is “The Oscillator
MAX2620 PACKAGE MODEL
__________________Pin Configuration
TOP VIEW
as a Reflection Amplifier, an Intuitive Approach to
Oscillator Design, ” by John W. Boyles, Microwave
Journal , June 1986, pp. 83–98.
Output Matching Configuration
Both of the MAX2620’s outputs (OUT and OUT ) are
V CC 1 1
TANK 2
FDBK 3
SHDN 4
MAX2620
8
7
6
5
OUT
V CC 2
GND
OUT
open collectors. They need to be pulled up to the sup-
ply by external components. An easy approach to this
pull-up is a resistor. A 50 ? resistor value would inher-
ently match the output to a 50 ? system. The Typical
Operating Circuit shows OUT configured this way.
Alternatively, a choke pullup (Figure 1), yields greater
output power (approximately -8dBm at 900MHz).
When maximum power is required, use an inductor as
the supply pull-up, and match the inductor’s output
impedance to the desired system impedance. Table 1
in the Typical Operating Characteristics shows recom-
mended load impedance presented to OUT and OUT
μ MAX
for maximum power transfer. Using this data and stan-
dard matching-network synthesis techniques, a match-
ing network can be constructed that will optimize power
output into most load impedances. The value of the
inductor used for pullup should be used in the synthe-
sis of the matching network.
10
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MAX2622EUA+ 功能描述:VCO振荡器 855MHz - 881MHz Mono V Ctrld Osc RoHS:否 制造商:Exar 封装 / 箱体:SOIC-14 频率:300 kHz 负载电容: 封装:Reel 电源电压:4.5 V to 20 V 尺寸:4 mm W x 8.75 mm L x 1.75 mm H 最小工作温度:0 C 最大工作温度:+ 70 C
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