LO leakage as a function of TX power

Hi, I plan to use PicoZED SDR as a simple signal generator. I wonder how the LO leakage behaves as a function of transmitted signal power? For example, what can be seen at the transmitter output connector at LO frequency when the baseband signal is totally off? The frequency would be around 1.4GHz.

- Ivalo

0 mbrown over 7 years ago

"how the LO leakage behaves as a function of transmitted signal power?"

The analog devices EngineerZone is the place to ask questions about AD9361 performance.

Thanks,
/Matt
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0 Former Member over 7 years ago in reply to mbrown

AD9361 performance may be the largest contributor to leakage, however part of the leakage is caused by parasitics which depend on the board design, I think. So I would be happy if someone would plug a spectrum analyzer to the TX connector, set the signal amplitude to zero and see how much power is transmitted on the LO frequency :)
Thanks!
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0 Former Member over 7 years ago

RF performance can be accurately modeled in simulation using SimRF models of AD9361 Agile RF Transceiver from MathWorks. https://www.mathworks.com/hardware-support/analog-devices-rf-transceivers.html

You can generate or import test vectors and evaluate the effects of nonlinearity, noise, gain and phase imbalance, spectral leakage, and other imperfections introduced by the RF transmitter and receiver. The SimRF models have been validated with ADI in the lab with power spectral measurements.

This methodology is presented in detail within the Avnet 'Software-Defined Radio with PicoZed SDR SpeedWay Workshop 2015' on-line videos, posted on the main Avnet ‘Training & Events’ page https://products.avnet.com/wps/portal/ema/event/software-defined-radio-picozed-sdr-speedway-workshop-2015/

See Day 1 AM Lab: AD9361 System-Level Model Lab

This lab uses a simulation model of the Analog Devices RadioVerse AD9361 Wideband Low Power RF transceiver on PicoZed SDR to explore user options for tuning device parameters to meet system requirements for RF performance.
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