vp1953
Junior Member level 2
We have designed a low power VCO and to test it we are bringing out the VCO outputs to be connected to 50 ohm line on a board. We cannot match the VCO output nodes to 50 ohms since this would be too much of a load on the VCO and can affect its frequency and amplitude. So we thought we could connect a 2000 ohm resistor in between the VCO output and the 50 ohm line. This would of course attenuate the VCO signal on the line by 2000/50. VCO phase noise is -105dBc at 1MHz.
The concern is whether the measurement on a spectrum analyzer could be impacted in some way because of the 2000 resistor in series (other than the fact that it will be attenuated)?
Any other comments on testing low power VCO's would be greatly appreciated.
Thank you in advance.
The concern is whether the measurement on a spectrum analyzer could be impacted in some way because of the 2000 resistor in series (other than the fact that it will be attenuated)?
Any other comments on testing low power VCO's would be greatly appreciated.
Thank you in advance.