Keysight N9918A-010 - VNA Time Domain Option for N9918A
Option 010 is the VNA time domain option. In time-domain mode, FieldFox computes the inverse Fourier transform of the frequency-domain data to display reflection or transmission coefficients versus time.
THIS REQUIRES OPTION 210; OPTION 211 IS RECOMMENDED (BOTH SOLD SEPARATELY).
- S11/S21 in time domain, if Option 210 is ordered.
- To get time domain data for all four S-parameters and full 2-port cal, order Option 211
Setup parameters
- Time - Start, stop, center, span
- Gating - Start, stop, center, span, and on/off
- Numbers of points, velocity vector, line loss, window shape, independent control for all four traces
Time stimulus modes
- Low-pass step - Low-pass step is similar to a traditional time domain reflectometer (TDR) stimulus waveform. It is used to measure low-pass devices. The frequency-domain data should extend from DC (extrapolated value) to a higher value.
- Low-pass impulse- Low-pass impulse response is used to measure low-pass devices.
- Bandpass impulse - The bandpass impulse simulates a pulsed RF signal and is used to measure the time domain response of band-limited devices.
Windows
The windowing function can be used to filter the frequency domain data and thereby reduce overshoot and ringing in the time domain response.
- Windows - Minimum, medium, and maximum, manual entry of Kaiser Beta and impulse width.
Gating
The gating function can be used to selectively remove reflection or transmission time domain responses. In converting back to the frequency domain, the effects of the responses outside the gate are removed. The results can be viewed with gating on and off, using two traces.
- Gate types - Notch, bandpass
- Gate shapes - Maximum, wide, normal, minimum