Search found 4 matches

by tekguy49
Fri Apr 28, 2017 5:43 am
Forum: General Q&A
Topic: antenna design
Replies: 3
Views: 3234

Re: antenna design

Thanks for the input. As mentioned in the original question my maximum lateral dimension is 10mm. The Wroom-02 module uses a 1/4 wave design with a 16mm width based on a white paper published by Texas Instruments. The question is not whether to hire an antenna person or buy the software TI uses to s...
by tekguy49
Thu Apr 13, 2017 11:53 pm
Forum: General Q&A
Topic: antenna design
Replies: 3
Views: 3234

antenna design

I am considering the ESP8266 for an application that has a maximum pcb width of 10mm.

Question? Has the hardware design team looked at using a ceramic antenna instead of the pcb metal trace. If so, can you supply the mfr and part numbers.

thanks,
tekguy49
by tekguy49
Thu Jul 14, 2016 1:44 am
Forum: General Q&A
Topic: PWM, Sigma_Delta reference clocks
Replies: 2
Views: 2659

PWM, Sigma_Delta reference clocks

Documents for ESP8266EX indicate maximum PWM frequency is 1Khz. I need 20Khz to 100Khz. Can be PWM clock pre-scaler be modified?

I have the same question for the Delta_Sigma hardware.
by tekguy49
Thu Jul 14, 2016 1:41 am
Forum: General Q&A
Topic: ESP8266EX ADC Specification
Replies: 1
Views: 2272

ESP8266EX ADC Specification

I have read the esp8266 hardware spec on the adc. Doc gives voltage range of 0-1V, but no DNL or INL data. I have looked at a couple of IC's and see about 13Lsb's of offset... This about 1% of the dynamic range... Is this normal? Any data on noise?

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