Smps and nrf24l01

RE: Smps and nrf24l01

davids — Fri, 01 Dec 2017 03:39:32 GMT

Because of time deadline..i have to used my old skematic linear regulator 78L33 at the moment..but surely..i have to move to smps do to low stanby current because of their hi efficiency ..smps only consume 2.5ma to drop from 12volt to 3.3volt..linear ic will draw around 10ma.. Without load

RE: Smps and nrf24l01

ketil — Thu, 30 Nov 2017 08:34:34 GMT

That is great to hear that you are using nRF24L01+. Please let us know if you solve the problem

RE: Smps and nrf24l01

davids — Tue, 28 Nov 2017 15:06:29 GMT

Actually Im using Nrf24L01+ for my project

RE: Smps and nrf24l01

ketil — Tue, 28 Nov 2017 09:10:04 GMT

You may find hardware resources, whitepapers and application notes on the Nordic Infocenter.

Please note that the nRF24L01 is not recommended for new designs: "This product is not recommended for new designs. Nordic recommends its drop-in compatible nRF24L01+ or for a System-on-Chip solution the Nordic nRF24LE1 or nRF24LU1+ for new designs." We highly recommend you switch to nRF24L01+ or one of the other alternatives.

Please see this application note for testing the nRF24L01+ RF Performance and details about RX local oscillator.

RE: Smps and nrf24l01

davids — Mon, 27 Nov 2017 16:02:32 GMT

Hi..thanks Ketil... You are probably right..i was think the same thing with you..but i dont know that the rx local oscillator have twice my smps frequecy....it would be very likely the harmonic problem....filtering my smps seems too costly..it would be better if i change the smps controller with different frequency... Btw.. where you got the information about the rx local frequecy at 2.4MHz? And Wich tools do you think i can observe this problem..(other than spectrum analyzers..It is too costly for me

RE: Smps and nrf24l01

ketil — Mon, 27 Nov 2017 13:26:43 GMT

Hi,

It is most likely that you power supply has too much noise. The radio, RX and TX, is dependent on a stable power supply with little noise. The 2nd harmonic of the SMPS is almost the same as the RX local oscillator at ~2.8MHz. This will affect the receiver performance if the noise level is too high at this frequency. You can fix or improve this with better filtering of your power supply. If this doesn't help, you must use another regulator with a different switching frequency.

Ketil