For price, delivery and to place orders: Hittite Microwave Corporation, 20 Alpha Road, Chelmsford, MA 01824

Phone: 978-250-3343

Fax: 978-250-3373

Order On-line at www.hittite.com

Application Support: Phone: 978-250-3343 or apps@hittite.com

11

11 - 16

HMC909LP4E

v02.0511

RMS POWER DETECTOR

SINGLE-ENDED, DC - 5.8 GHz

Table 1: Transient Response vs. SCI Setting [1]:

RMSOUT Rise-Time 10% -> 90% (µs)

RMSOUT Rise Settling Time (µs) [2]

RMSOUT Fall-time 100% -> 10% (µs)

scI4,3,2,1

Pin = -20 dBm

Pin = -40 dBm

Pin = -20 dBm

Pin = -40 dBm

Pin = -20 dBm

Pin = -40 dBm

0000

0.042

0.032

0.408

0.484

1.7

1.72

0010

0.042

0.134

0.484

0.488

5.5

5.4

0100

0.06

1.32

2.6

2.12

19.5

23

0110

2.6

5.55

10.2

9.3

86

90

1000

13

25.5

59

38

350

380

1010

48

104

208

180

1500

1600

1100

190

460

870

800

6200

6500

Rise Time[3] vs.

SCI Setting over Input Power

Fall Time[4] vs.

SCI Setting over Input Power

Rise Settling Time [2] vs.

SCI Setting over Input Power

1

10

100

1000

10000

100000

01234

5

6789

10

11

12

-40 dBm

-20 dBm

0 dBm

INTEGRATION SETTING (IN DECIMAL)

For increased load drive capability, consider a buffer

amplifier on the RMS output. Using an integrating

amplifier on the RMS output allows for an alternative

treatment for faster settling times. An external amplifier

optimized for transient settling can also provide

additional RMS filtering, when operating HMC909LP4E

with a lower scI value.

Following figures show how the peak-to-peak ripple

decreases with higher scI settings along with the rF

pulse response over different modulations.

0.01

0.1

1

10

100

1000

10000

01234

5

6789

10

11

12

-40 dBm

-20 dBm

0 dBm

INTEGRATION SETTING (IN DECIMAL)

0.1

1

10

100

1000

10000

100000

01234

5

6789

10

11

12

-40 dBm

-20 dBm

0 dBm

INTEGRATION SETTING (IN DECIMAL)

[1] Input signal is 1900 MHz cw -tone switched on and off

[2] Measured from RF switching edge to 1dB (input referred) settling of RMSOUT.

[3] Measured from 10% to 90%

[4] Measured from 100% to 10%

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responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

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For price, delivery, and to place orders: Analog Devices, Inc.,

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106

Phone: 781-329-4700 • Order online at www.analog.com

Application Support: Phone: 1-800-ANALOG-D