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1.2GHz VCO with Linear
Modulation Input
Applications Information
Tune Input
The tuning input is typically connected to the output of
the PLL loop filter. The loop filter provides an appropri-
ately low-impedance source. Incorporate an extra RC
filter stage to reduce high-frequency noise and spuri-
ous signals. Any excess noise on the tuning input is
directly translated into FM noise, which can degrade
the phase-noise performance of the oscillator.
Therefore, it is important to minimize the noise intro-
duced on the tuning input. A simple RC filter with low
corner frequency is needed during testing to filter the
noise present on the voltage source driving the tuning
line.
f NOM + f MOD
f NOM
f NOM - f MOD
0.5
1.0
1.5
2.0
2.5
Two-Level FSK Applications
The MAX2754 is designed for use in FSK applications
operating in the 2.4GHz to 2.5GHz ISM band. Specifically,
it is targeted for those systems which utilize a direct TX
modulation architecture in which the VCO is directly modu-
lated with the data signal during the transmit (TX) mode.
The VCO in these systems runs at half the RF output
frequency and is used in conjunction with a frequency
doubler to produce the final LO signal for both RX and
MODULATION VOLTAGE, V MOD (V)
Figure 1. Modulation Frequency Deviations Characteristics
Figure 2 shows a typical applications circuit. To com-
pute R1, R2, R3, and R4, determine the modulation
voltage center point (V MODB = +1.4V). Compute the
required modulation voltage deviation as follows:
TX modes of operation.
V CC
330nF
VREG
REG AND BIAS
V CC
330nF
V CC
FROM PLL
LOOP FILTER
TUNE
OSCILLATOR
CORE
OUT
OUT TO
MIXER/
SYNTHESIZER
R1
INVERTED
R2
CMOS
GND1
GND2
SIGNAL
R3
MOD.
FILTER
MOD
LINEAR
MODULATION
INTERFACE
SHDN
FROM BASEBAND
DIGITAL
CONTROLLER
R4
Figure 2. Typical Application Circuit for Two-Level FSK
MAX2754
6
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