Getting Started > Description of Individual Diagram Blocks
Description of Individual Diagram Blocks

The signal path of the instrument is configured by installing a frequency option that comprises all required modules including synthesizer, output section and attenuator (optional without attenuator).

One of the following options must be installed.
  • R&S SMA-B103 (up to 3.2 GHz)
  • R&S SMA-B103L (up to 3 GHz without attenuator)
  • R&S SMA-B106 (up to 6 GHz)
  • R&S SMA-B106L (up to 6 GHz without attenuator)
  • R&S SMA-B131 (up to 31,8 GHz)

Instruments without step attenuator provide a restricted level range at the RF output. Refer to the data sheet for detailed information.

See data sheet for detailed information.

Up-to-date information is available at R&S SMA homepage on the internet http://www.rohde-schwarz.com/product/sma100a.html.

Mod Gen block

The internal modulation sources are configured in this block. Also, the "LF frequency sweep" can be activated here.

Two internal LF generators (second is optional) are available as the internal source(s) for the analog modulations AM, FM and PhiM. Different modulation shapes - sine, triangle, rectangle and noise - are offered for the second LF generator. Bandwidth and level distribution can be selected for the noise signal of the noise generator (optional).

Available modulation shapes are:
  • sine
  • triangle (optional)
  • square (optional)
  • trapeze (optional)
  • noise with selectable bandwidth and level distribution (optional)

The internal modulation signals are provided at the LF output at the front of the instrument. The LF output signal and the modulations sources for the analog modulations AM, FM and PhiM can be selected independently from each other.

A pulse generator provides single and double pulse modulation with selectable pulse widths and periods. Additionally, an option is available to generate pulse train signals.

The R&S SMA offers three different sweep types (frequency sweep, level sweep and LF sweep) to be activated alternatively. Each type has 6 modes which differ with respect to the sweep cycle mode (continuous, individual and step-by-step) and triggering mode (automatic, internal and external). In the "Mod Gen" block, the LF sweep is configured. Frequency and level sweep settings are accessed via the "RF" block.

The status display in the block shows whether LF generator and/or a sweep are active. The selected internal LF generator and/or noise source are switched on or off with the TOGGLE ON/OFF key.

Modulation block

The internal and external analog modulations are configured and activated in this block. The MOD ON/OFF key switches the active modulation(s) on/off.

The internal modulation sources are configured in the "Mod Gen" block. The modulation inputs AM EXT, FM/PHIM EXT and PULSE EXT at the rear of the instrument are provided for external amplitude, frequency, phase and pulse modulation. AC or DC coupling for external feed is possible.

Modulation signals of up to three sources (two internal sources and one external source) can be combined for AM/FM and PhiM modulation.

Available internal and external analog modulation modes are:
  • Amplitude modulation (AM)
  • Frequency modulation (FM, optional)
  • Phase modulation (PhiM, optional)
  • Pulse modulation (Pulse)
  • Chirp modulation (internal only)
In addition, external digital modulation signal can be used. The external signal for digital FM/PhiM modulation is fed in via the AUX I/O interface.
  • Digital Frequency modulation (optional)
  • Digital Phase modulation (optional)

Note: For modulation modes that can be simultaneously used, refer to the R&S SMA data sheet.

The status display in the block shows the active modulation(s). Use the TOGGLE ON/OFF key to switch the active modulation of the block on or off.

RF block

In this block, the RF parameters and frequency/level sweep settings are set.

The active sweep is displayed in the block. The RF ON/OFF key switches the RF signal on and off. When the signal is switched off, the switch before the RF output symbol is open.

RF settings include:
  • Frequency and reference frequency
  • Level settings; if required.
  • NRP-Z Power Viewer and Power Analysis using power sensors
  • Frequency and level sweep
  • List Mode settings. In this mode, extremely fast frequency and level settings can be made.

The RF 50 OHM output connector at the front of the instrument provides the RF signal. An external trigger/gate signal for sweeps is input via the INST TRIG connector at the rear of the instrument

Note: Frequency and level are set fast with the aid of the FREQ and LEVEL keys.

Use the TOGGLE ON/OFF key to switch the RF output on or off.

Clock Synthesis

In this block, the clock synthesis is switched on or off and the frequency of the clock signal is set. For instruments equipment with modules with order number 1400.2749.02 DC offset can be defined, in addition.

The clock frequency is displayed in the block. Use the TOGGLE ON/OFF key to switch the generation of clock signal on or off.

 


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