For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, 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

25

HMC993LP5E

v00.0911

RF AUTOMATIC GAIN CONTROLLER

(RF-AGC), 700 - 3000 MHz

Figure 5: The HMC993LP5E’s AGC configuration with 2 attenuators, 1900 MHz tune.

In closed loop operation the HMC993LP5E is able to automatically adjust the RF gain over a gain adjustment range of

up to 33.6 dB at 1900 MHz. The HMC993LP5E’s output dynamic range is a function of both input power level and the

coupler ratio used to close the AGC loop. The combined effect of the input power and coupler ratio on the output power

dynamic range is presented in Figures 6a and 6b.

For high input power levels, the maximum level of output dynamic range is limited by the Psat of the VGA or the high-

est detectable power level by the log detector. To eliminate any limitations that can arise due to highest detectable log

Figure 6a: Output Power vs. VSET over Input Power,

2 attenuators @ 1900 MHz.

Figure 6b: Output Power vs. VSET over coupler

ratio, 2 attenuators @ 1900 MHz.

-50

-40

-30

-20

-10

0

10

20

30

0.2

0.4

0.6

0.8

1

1.2

Coupler= -13 dBm

Coupler= -20dBm

Coupler= -30 dBm

Ideal= -13 dBm

Ideal= -20 dBm

Ideal= -30 dBm

-4

-3

-2

-1

0

1

2

3

4

Error@Pin= -13 dBm

Error@Pin= -20 dBm

Error@Pin= -30 dBm

VSET (V)

Pin=-10dBm

-50

-40

-30

-20

-10

0

10

20

30

0.2

0.4

0.6

0.8

1

1.2

Input Power = -20 dBm

Input Power = -10 dBm

Input Power = 0 dBm

Ideal

-4

-3

-2

-1

0

1

2

3

4

Error@Pin = -20 dBm

Error@Pin = -10 dBm

Error@Pin = 0 dBm

VSET (V)

20 dB coupler is used