Connected devices and mobile applications require wireless network access that is resilient, secure and able to protect individuals’ privacy. For this reason, a massive number of harmonized standards and specifications have been developed by the wireless industry. Conformance to these standards and specifications is the way to accomplish resilient and secure wireless access.
More specifically, ETSI/3GPP has released an extensive conformance test specifications (TS 136 521-1 for LTE and TS 138 521-1 for 5G NR) that stipulate how and to what levels the radio properties of a mobile device should be verified in order to enable high quality wireless access. Two important objectives for the conformance test specification are to detail requirements applicable for any mobile device with respect to:
- Transmitter output spurious emissions
- Receiver blocking characteristics
(Receiver blocking characteristic is a measure of the receiver’s ability to receive a wanted signal in the presence of an unwanted interferer.)
Appropriate testing and conformance to these requirements are needed to safeguard the quality of the wireless access for an individual user as well as for the overall network performance.
In some cases, the performance requirements – and hence the test levels – are so stringent that the capabilities of conventional test instruments are not enough. This is in particular the case for commercially available:
- Spectrum analyzers – that do not have the dynamic range needed to fully verify transmitter output spurious emissions
- Signal generators – that exhibit too much broadband noise to adequately verify receiver blocking characteristics
To address this, Ranatec has developed the RI 266 – a state-of-the-art, programmable notch filter. The RI 266 extends the dynamic range in spurious emission measurements with at least 30 dB by selectively suppressing the wanted transmitted signal, while leaving the spurious outputs unaffected. Similarly, the RI 266 can be set up to lower the noise level at the wanted receive frequency from any signal generator with up to the same amount, thus enabling adequate verification of receiver blocking characteristics.
The RI 266 is intended for both formal conformance testing, performed by accredited test houses, as well internal verification by mobile device vendors.