Agilent Technologies E1445A Guia do Utilizador descarregar pdf (Página 221)

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3-132 Agilent E6432A Microwave Synthesizer User’s Guide

Soft Front Panel Help

I/Q Calibration (Option UNG Only)

NOTE If the external I and Q source signals cannot be adjusted to a low

enough output level, attenuator values within the I/Q modulator

circuitry can be adjusted. For example, from the I/Q External Source

Adjustments dialog box, adjust the I Attenuation and Q Attenuation

controls. These I and Q Attenuation controls adjust the input level to

the mixers in the I/Q modulator circuitry to prevent overdriving. (Refer

to the drawing shown in Understanding I/Q Calibration.)

9. Adjust the ratio of I-gain to Q-gain (leave Q Gain fixed and adjust

I Gain) as well as the Quadrature to minimize the

Undesired-Sideband Signal. For optimum results, it is best to

iterate a few times between the gain adjustment and the quadrature

adjustment.

Adjust the I and Q Offset values to minimize the carrier feed

through signal. It is best to iterate a few times between the I and

Q Offset adjustments.

I/Q Calibration Example

As an example, set the synthesizer center frequency to 2 GHz, with

external I and Q source signals of approximately 0.35 Vrms, the I input

as a cosine wave at 10 kHz, and the Q input as a sine wave at 10 kHz.

(The synthesizer may be set to any center frequency from 10 MHz to

20 GHz; I/Q calibration is independent of the synthesizer center

frequency.)

The result, when viewing the RF output of the synthesizer on a

spectrum analyzer, should produce an undesired-sideband signal, a

carrier-feedthrough signal, and a desired-sideband signal.

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