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Amplitude modulation (Option UNT)

AM depth type Linear or exponential

Maximum depth 100%

Depth resolution 0.1% of depth (nom)

AM depth error

@1 KHz rate and < 80% depth

f < 5 MHz < 1.5% of setting + 1% (typ 0.5% of setting + 1%)

5 MHz ≤ f ≤ 2 GHz < 3% of setting + 1 %

2 < f < 3 GHz < 5% of setting + 1% (typical 3% of setting + 1%)

Total harmonic distortion

@ 1 KHz rate

F < 5 MHz

30% depth < 0.25%, typical

80% depth < 0.5%, typical

5 MHz ≤ f < 2 GHz

(2 to 3 GHz is typical)

30% depth < 2%

80% depth < 2%

Frequency response 30% depth, 3 dB BW DC/10 Hz to 50 KHz

AM inputs using external inputs

1 or 2

Sensitivity +1 V peak for indicated depth (Over-range can be 200% or

2.2 V peak)

Input impedance 50 Ω or 600 Ω or 1M Ω, Damage level: ± 5 V max

Paths AM path 1 and AM path 2 are summed internally for composite

modulation

Wideband AM (N5172B only) Rates ALC off/on DC/800 Hz to 60 MHz, nominal

Sensitivity 0.25 V = 100% (I input + 0.5 V offset)

Input impedance 50 Ω, nominal (I input)

Simultaneous and composite modulation

Simultaneous modulation All modulation types (IQ, FM, AM, ΦM, and pulse modulation) may be simultaneously enabled

except: FM and phase modulation cannot be combined and two modulation types cannot be

simultaneously generated using the same modulation source; for example, the baseband I/Q

generator, AM, and FM can run concurrently and all will modulate the output RF (this is useful for

simulating signal impairments)

Composite modulation AM, FM, and ΦM each consist of two modulation paths which are summed internally for

composite modulation; modulation can be any combination of internal or external sources

AM FM Phase Pulse Internal IQ

External IQ

AM ++++++

FM ++–+++

Phase + – ++++

Pulse +++–++

Internal I/Q

++++* +

External IQ

+++++–

+ = compatible, – = incompatible, * = Internal + External

1. AM speciﬁ cations apply 6 dB below maximum speciﬁ ed power from 20 to 30 °C.

2. IQ modulation available on N5172B.

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