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MAX2202

RMS Power Detector

Maxim Integrated 

RMS Power Detector

PA 1

COUPLER 1

50Ω

10Ω

PA 2

COUPLER 2

10Ω

50Ω

ENABLE

RMS

DETECT

BIAS

BUFFER

DETECTOR

OUTPUT

MAX2202

Figure 1. System Level Connection

Applications Information

Detector RF Input

The MAX2202 generally requires a terminating resistor

and series capacitor between the directional coupler’s

output and detector RF input. As shown in the Typical

Operating Characteristics, an S11 of less than -9dB is

possible when a terminating resistor of 50Ω and series

capacitor of 220pF are used at the input. S11 of the

MAX2202 RFIN port without input matching is shown in

Table 2 and can be downloaded from Maxim’s website.

In cases where the detector is connected to two or

more directional couplers, as shown in Figure 1, the

50Ω terminating resistor can be eliminated.

Detector Voltage Output

The output of the MAX2202 goes to an ADC for further

processing by the baseband system. Connect a series

10kΩ resistor and a shunt capacitor to the detector out-

put to reduce residual amplitude ripple. The shunt

capacitor should be 4.7nF for WCDMA and 15nF for

NCDMA.

Enable Logic Level

The device features an enable input (ENA) that allows

the device to be put into shutdown. For normal opera-

tion, drive ENA high. For device shutdown, drive ENA

low. The ENA pin is DC biased through a resistor. The

value of the resistor is recommended to be greater than

Table 2. RF Input S11

FREQ

(MHz)

S11

(dB)

S11

FREQ

(PHASE) (MHz)

S11

(dB)

300 -1.63

-34.1

1560 -1.37

360 -1.69

420 -1.75

-39.6

-44.9

1620

1680

-1.35

-1.35

480 -1.77

540 -1.77

-50.2

-55.9

1740

1800

-1.35

-1.36

600 -1.75

660 -1.74

-61.4

-66.9

1860

1920

-1.36

-1.41

720 -1.72

-72.6

1980 -1.35

780 -1.70

840 -1.62

-78.6

-84.2

2040

2100

-1.37

-1.34

900 -1.59

-90.2

2160 -1.36

960

1020

-1.53

-1.52

-96.2

-102.2

2220

2280

-1.37

-1.37

1080 -1.45 -108.4 2340 -1.39

1140

1200

-1.46

-1.40

-114.5

-120.5

2400

2460

-1.37

-1.39

1260 -1.40 -126.5 2520 -1.38

1320

1380

1440

1500

-1.39

-1.37

-1.35

-1.37

-132.6

-138.9

-144.6

-150.6

2580

2640

2700

—

-1.40

-1.39

-1.40

—

Note: VCC = 2.8V, S11 measured at RFIN bump.

S11

(PHASE)

-156.4

-162.4

-168.0

-173.7

-179.2

175.3

170.0

164.8

159.6

154.5

149.2

144.2

139.2

134.5

129.5

124.7

119.9

115.2

110.4

105.7

—

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