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

29

HMC1197LP7FE

v00.0912

WIDEBAND DIRECT QUADRATURE MODULATOR

w/ FRACTIONAL-N PLL & VCO, 100 - 4000 MHz

in order to maximize sideband rejection performance.

Frequency

(MHz)

≤500

600

700

800

900/1000

1100

1200

1300

1400

1500

1600

1700

≥1800

Filter Bank

Selection

0

1

4

6

7

8

9

11

12

13

13

14

15

Frequency

(MHz)

≤700 800/900 1000 1100 1200/1300/1400 1500/1600/1700 1800 1900 2000 2100 2200/2300 2400/2500/2600 ≥2700

Filter Bank

Selection

0

1

4

5

7

8

9

10

11

12

13

14

15

Uncalibrated sideband rejection can be further improved by empirically selecting the filter bank that provides the

highest rejection for a given frequency . See Table 3 and Figure 4.

Table 3. Empirical filter band selection.

Frequency

(MHz)

≤500

600

700

800

900

1000/1100

1200 1300/1400/1500 1600 1700/1800 1900/2000

>2000

Filter Bank

Selection

0

1

5

7

8

0

7

8

9

10

11

15

-70

-60

-50

-40

-30

-20

-10

0

0

1000

2000

3000

4000

3rd Harmonic Suppression

2nd Harmonic Suppression

Empirical Band Selection

FREQUENCY (MHz)

Figure 4. Sideband suppression vs. frequency for different filter band selections.

The filter bank selection process for optimal sideband rejection performance also depends on the LO power level at

the output of the PLL/VCO. LO power in this example set to maximum power level.