E8257D Datasheet, PDF (26/37 Pages) Keysight Technologies – Microwave Analog Signal Generator

26 | Keysight | E8257D Microwave Analog Signal Generator - Data Sheet
Specifications (continued)
Amplitude modulation ^{1, 2} (Option UNT) (typical)
Depth
Linear mode
Exponential (log) mode (downward modulation only)
Option UNT
Option UNT + 1SM ³
Maximum
ALC on
> 90%
> 20 dB
> 20 dB
ALC off with power search ⁴
or ALC on with deep AM ⁵
> 95%
> 50 dB ⁶
> 60 dB ⁶
Settable
0 to 100%
0 to 40 dB
0 to 40 dB
Sensitivity
0 to 100 %/V
0 to 40 dB/V
0 to 40 dB/V
Resolution
0.1%
0.01 dB
0.01 dB
Depth accuracy (1 kHz rate)
ALC on
± (6% of setting + 1%)
± (2% of setting + 0.2 dB)
± (2% of setting + 0.2 dB)
ALC off with power search ⁴ or ALC on with deep AM ⁵
< 2 dB depth
—
—
± 0.5 dB
< 10 dB depth
—
—
± 1 dB
< 40 dB depth
—
—
± 2 dB
< 50 dB depth
—
—
± 3 dB
< 60 dB depth
—
—
± 5 dB
External input (selectable polarity)
Sensitivity for indicated depth
Maximum allowable
1 V_peak
±1V
–1 V or +1 V
± 3.5 V ⁷
–1 V or +1 V
± 3.5 V ⁷
Rates (3 dB bandwidth, 30% depth)
DC coupled
0 to 100 kHz
AC coupled
10 Hz to 100 kHz (useable to 1 MHz) ⁸
Distortion ⁹ (1 kHz rate, ALC On, linear mode, total harmonic distortion)
30% AM
< 1.5%
60% AM
< 2%
Paths
AM1 and AM2 are summed internally for composite modulation. Either path may be switched to
any one of the modulation sources: Ext1, Ext2, Internal1, Internal2
1.  All AM specifications are typical. For carrier frequencies below 2 MHz or above 50 GHz, AM is useable but not specified. Unless otherwise
stated, specifications apply with ALC on, deep AM off, and envelope peaks within ALC operating range (–20 dBm to maximum output power,
excluding step-attenuator setting.)
2.  Below 250 MHz with Option UNX and UNY low phase noise mode on, AM is useable but not recommended or specified.
3.  Option 1SM scan modulation is available with Options 513 and 520 only, and provides exponential (log) AM with improved accuracy. In this
mode, maximum output power is reduced up to 3 dB below 3.2 GHz.
4.  ALC off is used for narrow pulse modulation and/or high AM depths with envelope peaks below ALC operating range (40 dB). Carrier power
level will be accurate after a power search is executed. (See pulse modulation section for an explanation of power search).
5.  Deep AM with ALC on provides increased AM depths and improved distortion, together with closed-loop internal leveling. This mode must be used
with a repetitive AM waveform (frequency > 10 Hz) with peaks > –5 dBm (nominal, excluding step-attenuator setting).
6.  Modulation depths greater than 40 dB require an external input greater than ± 1 V, and are not available with the internal modulation source.
7.  If 600 Ω input impedance is selected, maximum input voltage is ± 6 V.
8.  For Options 550 and 567, maximum rate is 80 kHz from 20 GHz to 40 GHz.
9.  For Option 521, distortion specifications apply for envelope peaks within the range of -15 dBm to +24 dBm, excluding step-attenuator setting.