MAX2009EVKIT MAXIM [Maxim Integrated Products], MAX2009EVKIT Datasheet - Page 3

• Manufacturer Part Number: MAX2009EVKIT
• Description: MAX2009/MAX2010 Evaluation Kits
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 2. Gain Section Control Voltages
The following sections describe the tuning methodology
best implemented with a class A amplifier. Other classes
of operation may require significantly different settings.
Capacitors C4 and C5 are 0.01µF (±10%) and are used
for minimizing low-frequency noise on the supply.
The MAX2009 external matching networks at the input
and output of the phase and gain sections consist of
C1, C11, C10, C12, C9, C8, C6, C7, along with some
high-impedance transmission lines. The MAX2010
matching consists of C1, C11, L1, L2, C10, C12, C9, C8,
C6, and C7.
Varactors VR1 and VR2 provide fine tuning of the
phase-expansion slope. Resistors R1 and R2 provide a
high-impedance method to inject control voltage on the
varactors. Capacitors C2 and C3 are coupling capaci-
tors that also offset the series parasitic inductance of
the chip and PC board. If phase-slope fine tuning is not
required in the user’s application, then only C2 and C3
to ground are necessary.
The MAX2009/MAX2010 controls can provide real-time
software-controlled distortion corrections as well as set-
and-forget tuning by setting the expansion starting
point (breakpoint) and the rate of expansion (slope).
The gain and phase breakpoints are adjustable over a
20dB input power range. The phase expansion slope is
variable from 0.3°/dB to 2.0°/dB and can be adjusted
for a maximum of 24° of phase expansion. The gain
expansion slope is variable from 0.1dB/dB to 0.6dB/dB
and can be adjusted for a maximum of 7dB gain
expansion.
The PB_IN input voltage range of 0V to V
sponds to a breakpoint input power range of 3.7dBm to
23dBm. In order to achieve optimal performance, the
phase-expansion breakpoint of the MAX2009/
MAX2010 must be set to equal the phase compression
point of the PA.
PIN (J5)
G_BP
G_CS
G_FS
External Matching Components
Supply Decoupling Capacitors
_______________________________________________________________________________________
Phase-Expansion Breakpoint
Detailed Description
Gain and Phase Controls
Phase-Tuning Section
MAX2009/MAX2010 Evaluation Kits
VOLTAGE (V)
1.2
1.0
5
CC
corre-
Control pin PBRAW should be shorted to the PBEXP
output pin for most applications. Driving PBRAW direct-
ly allows for additional control such as obtaining phase
compression for some and/or all the input power
sweep. Resistor R3 allows the option of driving PBRAW
with a low-impedance voltage, which overrides the
PBEXP output voltage.
The phase-expansion slope of the MAX2009/MAX2010 is
controlled by the PF_S1, PF_S2, PD_CS1, and PD_CS2
pins. Most applications require PF_S1 and PF_S2 to be
driven identically, and therefore they are shorted on layer
4 of the PC board. The phase-expansion slope of the
MAX2009/MAX2010 must also be adjusted to equal the
opposite slope of the PA’s phase-compression curve.
The G_BP input voltage range of 0.5V to 5.0V
corresponds to a breakpoint input power range of -3dBm
to 23dBm. In order to achieve the optimal performance,
the gain-expansion breakpoint of the MAX2009/
MAX2010 must be set to equal the gain-
compression point of the PA. The G_BP control has a
minimal effect on the small-signal gain when operated
from 0.5V to 5.0V.
Both G_CS and G_FS pins have an input voltage range
of 0V to V
0.1dB/dB to 0.6dB/dB. The slope is set to maximum
when V
its minimum when V
tion to properly setting the breakpoint, the gain-expan-
sion slope of the MAX2009/MAX2010 must also be
adjusted in order to compensate for the PA’s gain com-
pression. The slope should be set using the following
equation:
where:
MAX20XX_SLOPE = MAX2009/MAX2010 gain section’s
slope in dB/dB.
PA_SLOPE = PA’s gain slope in dB/dB, a negative
number for compressive behavior.
Unlike with the G_BP pin, modifying the gain-expansion
slope bias on the G_CS pin causes a change in the
part’s insertion loss and noise figure. For example, a
smaller slope caused by G_CS results in a better inser-
tion loss and lower noise figure.
MAX20XX_SLOPE =
GCS
CC
, corresponding to a slope of approximately
= 0V and V
GCS
GFS
= +5V and V
Gain-Expansion Breakpoint
= +5V, and the slope is at
1
Phase-Expansion Slope
−
Gain-Expansion Slope
+
PA SLOPE
PA SLOPE
_
_
GFS
= 0V. In addi-
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