Specifications for Analog Modulation

External burst envelope

Composite modulation

Simultaneous modulation

Input voltage

 

 

RF On

0 V

 

RF Off

–1.0 V

 

Linear control range

0 to –1 V

 

 

 

 

On/off ratio1

 

 

Condition: Vin below –1.05 V

 

 

4 GHz

> 75 dB

 

> 4 GHz

(> 64 dB)

 

 

 

Rise/fall time1

 

 

Condition: With rectangular input

 

 

(< 2 µs)

 

 

 

Minimum burst repetition frequency1

 

ALC on

(10 Hz)

 

ALC off

DC

 

 

 

 

Input port

External 1

 

 

 

 

Input impedance

50 , nominal

 

 

 

 

AM, FM, and FM each consist of two modulation paths which are summed internally for composite modulation. The modulation sources may be any two of the following: Internal, External 1, External 2.

Multiple modulation types may be simultaneously enabled. For example, W-CDMA, AM, and FM can run concurrently and all will affect the output RF. This is useful for simulating signal impairments. There are some exceptions: FM and FM cannot be combined; AM and Burst envelope cannot be combined; Wideband AM and internal I/Q cannot be combined. Two modulation types cannot be generated simultaneously by the same modulation source.

1. Parentheses denote typical performance.

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Agilent Technologies E4438C Input voltage, On/off ratio1, Rise/fall time1, Minimum burst repetition frequency1, Input port