LF-to-2.5GHz Dual Logarithmic Detector/

Controller for Power, Gain, and VSWR Measurements

14

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MAX2016

LNA

RFINA

RFINB

LOGARITHMIC

DETECTOR

LOGARITHMIC

DETECTOR

COUPLER

LO

MIXER

COUPLER

OUTD

SETD

20k

Ω

OUT

Figure 4. Conversion Gain Measurement Configuration

MAX2016

RFIN+_

RFIN-_

OUTA/OUTB

IN_

GND

R1/R2

20k

Ω

20k

Ω

DETECTORS

SETA/

SETB

OUTA/

OUTB

Figure 5. In Detector Mode (RSSI), OUTA/OUTB is a DC

Voltage Proportional to the Input Power (Note: Only one detec-

tor channel is shown within the figure. Since the MAX2016 is a

dual detector, the second channel can be easily implemented

by using the adjacent set of input and output connections.)

MAX2016

LOGARITHMIC

DETECTOR

LOGARITHMIC

DETECTOR

20k

Ω

VGA

GAIN CONTROL INPUT

RFINA

RFINB

OUTD

SETD

VGA INPUT

VGA OUTPUT

SET-POINT

DAC

COUPLER

COUPLER

Figure 6. In Gain-Controller Mode, the OUTD Maintains the

Gain of the VGA