HMC1197LP7FE datasheet(54/57 Pages) AD

54 / 57 page

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

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HMC1197LP7FE

v03.0314

Wideband direct Quadrature Modulator

w/ Fractional-n Pll & Vco, 100 - 4000 MHz

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Figure 47. The HMC1197LP7FE Calibrated Carrier Feedthrough

3.5

Sideband Suppression calibration

Sideband suppression is related to relative gain and relative phase offsets between the I-channel and

Q-channel. The amplitude and phase difference between the I and Q inputs can be adjusted in order to

optimize the sideband suppression for a specific frequency band and LO power level. The amplitude and

phase offsets at the I and Q inputs should be iteratively adjusted until a minimum sideband suppression

level is obtained. The externally available amplitude and phase steps and the modulator’s noise floor limit

the minimum achievable calibrated sideband suppression level. Figure 48 illustrates the typical calibrated

sideband suppression performance of the HMC1197LP7FE. In this characterization of the HMC1197LP7FE,

sideband suppression was calibrated at every 500MHz LO frequency steps at 25C and external amplitude

and phase offset settings were held constant during tests over temperature.

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Figure 48.The HMC1197LP7FE Calibrated Sideband Suppression

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

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.

Trademarks and registered trademarks are the property of their respective owners.

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

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