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

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6 - 10

HMC750LP4 / 750LP4E

v03.0111

12.5 Gbps LIMITING AMPLIFIER

Application Information

Setting the output swing using external resistor Rc

the HmC750lp4e features output swing level adjustment by using VC1 pin. Output swing can be adjusted to the

desired level by applying a DC voltage to VC1 pin. Differential output swing vs. control voltage relationship is given in

the plot below.

Differential Output vs. Control Voltage

0

200

400

600

800

1000

1200

2.1

2.3

2.5

2.7

2.9

3.1

+25C

+85C

-40C

CONTROL VOLTAGE VC1 (V)

in order to adjust the DC voltage on VC1 pin a resistor, rc (r7 in application circuit), should be connected between

VC1 pin and VCC as shown in the figure below.

the value of the resistor can be chosen using the following equation as a function of VC1. VC1 DC voltage value can

be chosen by using the plot given above.