7 - 8

7

HMC830LP6GE

v01.0711

FRACTIONAL-N PLL WITH INTEGRATED VCO

25 - 3000 MHz

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

Loop Filter

Bw (khz)

c1

(pF)

c2

(nF)

c3

(pF)

c4

(pF)

r2

(kΩ)

r3

(kΩ)

r4

(kΩ)

Loop Filter design

74

150

27

220

220

0.82

1

1

90

270

3.9

56

56

1.2

1

1

Loop Filter Configuration Table

Figure 19. Worst Spur, Fixed 50 MHz

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

0.1

1

10

100

1000

10000

100000

OFFSET (kHz)

Figure 20. Worst Spur, Tunable Reference,

-180

-160

-140

-120

-100

-80

-60

-40

-20

0

0.1

1

10

100

1000

10000

100000

OFFSET (kHz)

Figure 21. Worst Spur, Fixed vs. Tunable

-120

-110

-100

-90

-80

-70

-60

-50

2GHz +1kHz

2GHz +10kHz

2GHz +100kHz

2GHz +1000kHz

2GHz +10000kHz

Fixed 50 MHz Reference

Tunable Reference

OUTPUT FREQUENCY

[9] capability of hMc830LP6ge to generate low frequencies (as low as 25 Mhz), enables the hMc830LP6ge to be used as a tunable reference

source into another hMc830LP6ge, which maximizes spur performance of the second hMc830LP6ge. Please see “hMc830LP6ge

application information” for more information.

[10] the graph is generated by observing, and plotting, the magnitude of only the worst spur (largest magnitude), at any offset, at each output

frequency, while using a fixed 50 Mhz reference and a tunable reference tuned to 47.5 Mhz. see “hMc830LP6ge application information” for

more details.

[11] Phase noise performance of the hMc830LP6ge when used as a tunable reference source. hMc830LP6ge is operating at 3 ghz/30, 3

ghz/54, and 1.55 ghz/62 for the 100 Mhz, 55.55 Mhz, and 25 Mhz curves respectively. 25 Mhz output is 50 Mhz low pass filtered prior to input

to second PLL. 100 Mhz and 55.55 Mhz curves were not filtered.

-170

-160

-150

-140

-130

-120

0.1

1

10

100

1000

10000

100000

Carrier Frequency = 25 MHz

Carrier Frequency = 55.55 MHz

Carrier Frequency = 100 MHz

OFFSET (kHz)