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AD8340-EVAL 数据表(PDF) 11 Page - Analog Devices

部件名 AD8340-EVAL
功能描述  700 MHz to 1000 MHz RF Vector Modulator
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8340-EVAL 数据表(HTML) 11 Page - Analog Devices

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AD8340
Rev. 0 | Page 11 of 20
I-Q ATTENUATORS AND BASEBAND AMPLIFIERS
The proprietary linear-responding attenuator structure is an
active solution with differential inputs and outputs that offer
excellent linearity, low noise, and greater immunity from mis-
matches than other variable attenuator methods. The gain, in
linear terms, of the I and Q channels is proportional to its control
voltage with a scaling factor designed to be 2/V, i.e., a full-scale
gain setpoint of 1.0 (−2 dB) for VBBI (Q) of 500 mV. The control
voltages can be driven differentially or single-ended. The combi-
nation of the baseband amplifiers and attenuators allows for
maximum modulation bandwidths in excess of 200 MHz.
OUTPUT AMPLIFIER
The output amplifier accepts the sum of the attenuator outputs
and delivers a differential output signal into the external load.
The output pins must be pulled up to an external supply,
preferably through RF chokes. When the 50 Ω load is taken
differentially, an output P1dB and IP3 of 11 dBm and 24 dBm is
achieved, respectively, at 880 MHz. The output can be taken in
single-ended fashion, albeit at lower performance levels.
NOISE AND DISTORTION
The output noise floor and distortion levels vary with the gain
magnitude but do not vary significantly with the phase. At the
higher gain magnitude setpoints, the OIP3 and the noise floor
vary in direct proportion with the gain. At lower gain magni-
tude setpoints, the noise floor levels off while the OIP3
continues to vary with the gain.
GAIN AND PHASE ACCURACY
There are numerous ways to express the accuracy of the
AD8340. Ideally, the gain and phase should precisely follow the
setpoints. Figure 3 illustrates the gain error in dB from a best fit
line, normalized to the gain measured at the gain setpoint = 1.0,
for the different phase setpoints. Figure 6 shows the gain error
in a different form; the phase setpoint is swept from 0° to 360°
for different gain setpoints. Figure 8 and Figure 22 show analo-
gous errors for the phase error as a function of gain and phase
setpoints. The accuracy clearly depends on the region of opera-
tion within the vector gain unit circle. Operation very close to
the origin generally results in larger errors as the relative
accuracy of the I and Q vectors degrades.
RF FREQUENCY RANGE
The frequency range on the RF input is limited by the internal
polyphase quadrature phase-splitter. The phase-splitter splits
the incoming RF input into two signals, 90° out of phase, as
previously described in the RF Quadrature Generator section.
This polyphase network has been designed to ensure robust
quadrature accuracy over standard fabrication process parame-
ter variations for the 700 MHz to 1 GHz specified RF frequency
range. Using the AD8340 as a single-sideband modulator and
measuring the resulting sideband suppression is a good gauge
of how the quadrature accuracy is maintained over RF
frequency. A typical plot of sideband suppression from
500 MHz to 1.5 GHz is shown in Figure 28. The level of side-
band suppression degradation outside the 700 MHz to 1 GHz
specified range will be subject to manufacturing process
variations.
0
–5
–10
–15
–20
–25
–30
–35
500
1500
1400
1300
1200
1100
1000
900
800
600
700
FREQUENCY (MHz)
Figure28.SidebandSuppressionvs.Frequency


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