N5194A矢量适配器数据表.pdf - 第18页
Page 18 Find us at www .keysight.com Pul se M odul atio n Pulse types Def ine d by waveform Puls e W avefor m Maker – a bu ilt -i n feature to defi ne simp le IQ pul se ty pes. Th ese ca n be cal led by the PDW . However…
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Figure 9. Measured absolute phase noise using the external LO mode for N5192A.
Figure 10. Measured residual phase noise using the external LO mode for N5192A.
Measured external LO absolute phase noise for N5192A
Measured external LO residual phase noise for N5192A
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Pulse Modulation
Pulse types
Defined by waveform
Pulse Waveform Maker – a built-in feature to define simple IQ pulse types. These can be called by the PDW. However, it does not have
marker capability.
On/Off ratio
Integrated over 100 Hz bandwidth
External LO mode 100 dB
Internal LO mode 105 dB
Rise/fall times
1
Defined by IQ waveform. Minimum rise/fall time
Vector mode 4.0 ns (nom)
Enhanced vector mode (opt BB2) 2.0 ns (nom)
Wideband vector mode (opt BB1) 0.5 ns (nom)
Figure 11. 100 ns pulse with 16 ns rise/fall times. Figure 12. 20 ns pulse with 2 ns rise/fall times.
Overshoot
Vector mode 4 % (typ) up to 32 GHz
Enhanced vector mode (opt BB2) or
Wideband vector mode (opt BB1)
10 % (typ) up to 32 GHz
3
Pulse Width
2
Minimum Maximum
Vector mode 8 ns (nom) 8 ns (nom)
Enhanced vector mode 2 s (nom) 4 ns (nom)
Wideband vector mode 2 s (nom) 1 ns (nom)
Pulse repetition interval 250 ns (nom)
1. Rise/fall times are determined by the sample rate, but may experience degradation of pulse shape with extremely short rise/fall times. A minimum of 4 or more
samples is recommended for better rise/fall shape quality.
2. Pulse width is specified as the width of the RF ON pulse measured from the 50% points on the rising and falling edges. Minimum pulse width is determined
by the sample rate, but may experience degradation of pulse shape with extremely short rise/fall times. A minimum of 8 or more samples is recommended for
better pulse shape quality. Maximum pulse width is determined by the available baseband generator memory and sample rate.
3. Except at 2.199 GHz, where overshoot is 12% (nom).
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Level accuracy
Relative to CW signal
Test conditions: ALC off, with power alignment performed
Frequency
1
50 MHz to 15 GHz ± 0.75 dB
> 15 GHz to 20 GHz ± 1.0 dB
> 20 GHz to 32 GHz ± 0.75 dB
Video feed through
Frequency Vector mode, spec (typ) Wideband or enhanced vector mode
< 1.8 GHz 250 mV p–p (100) —
≥ 1.8 GHz 25 mV p–p (20) —
< 1.2 GHz — 250 mV p–p (100)
≥ 1.2 GHz — 25 mV p–p (20)
Pulse compression
Mode Vector mode
2
Wideband or enhanced vector mode
3
External LO ± 5 ns ± 2.5 ns
Internal LO
4
± 5 ns
1. Measured at the RF center frequency of the pulse.
2. Measurement conditions: pulse rise/fall times are 16 ns each, pulse width = 100 ns, pulse period = 1 us.
3. Measurement conditions: pulse rise/fall times are 5 ns each, pulse width = 20 ns, pulse period = 500 ns.
4. Internal LO specifcation only applies up to 20 GHz.