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LF-to-2.5GHz Dual Logarithmic Detector/
Controller for Power, Gain, and VSWR Measurements
Measuring Power (RSSI Detector Mode)
In detector mode, the MAX2016 acts like a receive-sig-
nal-strength indicator (RSSI), which provides an output
voltage proportional to the input power. This is accom-
plished by providing a feedback path from OUTA
(OUTB) to SETA (SETB) (R1/R2 = 0 Ω ; see Figure 5).
By connecting SET_ directly to OUT_, the op-amp gain
is set to 2V/V due to two internal 20k Ω feedback resis-
tors. This provides a detector slope of approximately
18mV/dB with a 0.5V to 1.8V output range.
Gain-Controller Mode
The MAX2016 can be used as a gain controller within
an automatic gain-control (AGC) loop. As shown in
Figure 6, RFINA and RFINB monitor the VGA’s input
produces a DC voltage at OUTD that is proportional to
the difference in these two RF input power levels. An
internal op amp compares the DC voltage with a refer-
ence voltage at SETD. The op amp increases or
decreases the voltage at OUTD until OUTD equals
SETD. Thus, the MAX2016 adjusts the gain of the VGA
to a level determined by the voltage applied to SETD.
Place the nominal signal levels of RFINA and RFINB
near the middle of their respective dynamic ranges to
accommodate the largest range of gain compensation.
This is nominally -25dBm to -30dBm. If so selected, the
nominal voltage applied to SETD will be approximately
1.0V. Operate the SETD voltage within the range of
0.5V to 1.5V for the greatest accuracy of gain control.
and output power levels, respectively. The MAX2016
VGA
DETECTORS
OUTA
OUTA
VGA INPUT
VGA OUTPUT
IN_
RFIN+A
COUPLER
COUPLER
RFIN-A
20k Ω
SETA
R1/R2
SET-POINT
DAC
GAIN CONTROL INPUT
20k Ω
GND
MAX2016
SETD
OUTD
IN_
DETECTORS
RFIN+B
OUTB
OUTB
20k Ω
MAX2016
RFIN-B
20k Ω
SETB
R1/R2
20k Ω
RFINA
LOGARITHMIC
DETECTOR
LOGARITHMIC
DETECTOR
RFINB
Figure 6. In Gain-Controller Mode, the OUTD Maintains the
Figure 5. In Detector Mode (RSSI), OUTA/OUTB is a DC
Voltage Proportional to the Input Power
Gain of the VGA
14
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