Instrument combines a spectrum analyser with a phase noise tester

Paul Boughton

Rohde & Schwarz has launched what it claims is the only instrument that combines a spectrum analyser and a phase noise tester up to 8 GHz26.5 GHz or 50 GHz. Users will profit from simpler and more flexible test sets at a considerably lower price.

To develop and produce high-quality transmit and receive equipment such as communications and broadcast systems or radarusers need the conventional measurements of both a phase noise tester and a spectrum analyser. A typical taskfor exampleinvolves measuring the oscillator's phase noiseharmonicssettling or power in the adjacent channels while testing transmit and receive modules. The R&S

FSUP provides high convenience and the versatility required for this.

When measuring phase noisethe instrument compares the ‘signal source’ DUT with a reference source. The R&S FSUP can use external as well as internal references for this purpose. At an input frequency of

640 MHz and a frequency offset of 10 kHzthe phase noise value of the R&S FSUP with an internal reference source is -136 dBc (1 Hz) and at 10 MHz frequency offset -165 dBc (1 Hz).

The R&S FSUP-B60 option provides the signal source analyser with two parallel receive paths. The symmetrical structure allows a cross-correlation between the two paths. The R&S FSUP can thus eliminate the uncorrelated inherent noise of the internal reference sources. This improves the dynamic range by up to 20 dBdepending on the number of averages.

Rohde & Schwarz GmbH & Co KG is based in MunichGermany.