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10MHz to 1050MHz Integrated
RF Oscillator with Buffered Outputs
Keeping the resonant tank circuit’s real component less
than one-half the magnitude of the negative real com-
ponent ensures that oscillations will start. After start-up,
the oscillator’s negative resistance decreases, primarily
due to gain compression, and reaches equilibrium with
the real component (the circuit losses) in the resonant
tank circuit. Making the resonant tank circuit reactance
tunable (e.g., through use of a varactor diode) allows
for tuneability of the oscillation frequency, as long as
the oscillator exhibits negative resistance over the
desired tuning range. See Figures 3 and 4.
V CC
The negative resistance of the MAX2620 TANK pin can
be optimized at the desired oscillator frequency by
proper selection of feedback capacitors C3 and C4.
For example, the one-port characteristics of the device
are given as a plot of 1/S11 in the Typical Operating
Characteristics . 1/S11 is used because it maps inside
the unit circle Smith chart when the device exhibits
negative resistance (reflection gain).
V CC
1000pF
10 ?
1000pF
10 μ H
27pF
V TUNE
1
V CC 1
OUT
8
0.01 μ F
OUT TO
MIXER
C5
V CC
1k ?
150pF
2
TANK
MAX2620
V CC 2
7
C17
C3
33pF
C6
L1
270pF
3
FDBK
GND
6
1000pF
33pH
2.2 μ H
D1
C4
270pF
4
SHDN
OUT
5
0.01 μ F
OUT TO
SYNTHESIZER
D1 = SMV1200-155 DUAL VARACTOR
Figure 3. 10MHz VCO LC Resonator
SHDN
V CC
51 ?
1000pF
8
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