The Agilent 11668A high pass filter accessory is recommended when making measurements on active devices that have gain below 50 MHz. Use of the Agilent 11668A, placed after the Agilent 11668B, reduces the modulator drive feedthrough from 8 mV to 1 mV and prevents possible amplifier saturation. Use of the Agilent 11668A filter is not necessary for passive measurements since the feedthrough from the Agilent 11665B is -65 dBm and causes no degradation in system performance.

Features:

• Reduced modulator drive feedthrough from 8 mV to 1 mV
• Eliminates the need for passive measurements