Agilent Technologies Option H48 Multiport Test Set Z5623A Especificaciones Pagina 25

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安捷倫科技高頻元件量測研討會
Feb.23, 2006
Pulsed S-parameter Measurement Modes
Narrowband/asynchronous acquisition
Extract central spectral component only; measurement appears CW
Data acquisition is not synchronized with incoming pulses (pulse trigger not required)
Sometimes called high PRFsince normally, PRF >> IF bandwidth
•“Spectral nulling" technique achieves wider bandwidths and faster measurements
No lower limit to pulse width, but dynamic range is function of duty cycle
IF filter
IF filter
Time domain
Frequency domain
D/R degradation = 20*log[duty cycle]
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安捷倫科技高頻元件量測研討會
Feb.23, 2006
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Filtered Output Using Spectral Nulling
Pulsed spectrum
Output
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Digital filter (with nulls aligned with PRF)
• With “custom” filters, number of filter sections (M) can be
chosen to align filter nulls with pulsed spectral components
• With spectral nulling, reject unwanted spectral components with
much higher IF bandwidths compared to using standard IF filters
Result: faster measurement speeds!
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