/etc... RF (Read-Only) Forum - Recent Threads

LMV232 Input pin ABSOLUTE MAXIMUM RATINGS?

Masazumi Ishii — Wed, 21 Oct 2015 10:45:42 GMT

Hello.

I have a question about LM232.

Input pin　RFIN1　and　RFIN2

Please inform me about Input Voltage　ABSOLUTE MAXIMUM RATINGS？

Thank you..

RE: LMV232 Input pin ABSOLUTE MAXIMUM RATINGS?

Bill Johns — Mon, 16 May 2016 06:54:42 GMT

Hello

The LMV232 ( Mean Square Power Detector for CDMA & WCDMA) is not supported by the Wireless Power Forum.

We can support Qi compliant and similar devices from the bq5XXXX family of products.

RE: LMV232 Input pin ABSOLUTE MAXIMUM RATINGS?

Hooman Hashemi — Sat, 14 May 2016 11:29:52 GMT

Hi,
I moved your post to Wireless Power forum where the LMV232 belongs.

Regards,
Hooman

1

jun GAO — Wed, 10 Feb 2016 17:05:09 GMT

RE: 1 MHz synchronous demodulator (Product detector)

Eddie LaCost — Wed, 10 Feb 2016 13:32:59 GMT

I am moving this to the /etc RF forum as this forum is intended for RFID and NFC posts.

RE: LMV232 Input pin ABSOLUTE MAXIMUM RATINGS?

Masazumi Ishii — Wed, 28 Oct 2015 21:37:55 GMT

Hellow.

How about an answer about this matter?

Input pin　RFIN1　and　RFIN2 : MAXIMUM input voltage?

Thank you..

UPDATE: This Forum will be Read-Only starting this Wednesday

Blake TI Community — Mon, 13 Jul 2015 19:39:57 GMT

Please note that starting this Wednesday, July 15th, the etc RF Forum will become "Read-Only." Any Forum threads still active then can be moved to the most applicable Forum.

For posting new questions at this time it's recommended to search for existing solutions at any of our current Wireless Connectivity Forums. In addition you can post a question there if you can't find what you are looking for. A Forum sitemap for all Wireless Connectivity Forums can be found here.

In this transition, you can send me a friends request or PM (private message) for any further assistance.

RE: UPDATE: This Forum will be Read-Only starting this Wednesday

Blake TI Community — Wed, 15 Jul 2015 11:24:09 GMT

This Forum is now "Read-Only". Any questions, please send me a Friend Request and private message.

How much to amplify RF signals before ADC?

Juan Abelaira — Wed, 08 Jul 2015 09:26:55 GMT

I'm working on a front-end for an SDR radio receiver. Most ADCs have input ranges in the order of volts, while the antenna signal can be as low as a fraction of a uV. I wonder if it's the way to go to amplify these signals by 120 dB (!?) without creating other problems in the circuit. Or is it that only voltage is amplified by not power (or not that much)?

Regards

RE: How much to amplify RF signals before ADC?

Juan Abelaira — Mon, 13 Jul 2015 04:59:07 GMT

I found in an app note, they use an 1:4 transformer with a -3 dBm input @ 50 ohm to feed the ADC differential input with 2V4 reference.

TRF7970A Host Card Emulation

M.H — Fri, 10 Jul 2015 06:34:19 GMT

Hi,

TRF7970A do is compatible with Android 4.4 Host Card Emulation (HCE)?

Best Regards,

RE: TRF7970A Host Card Emulation

Josh Wyatt — Fri, 10 Jul 2015 00:39:48 GMT

yes - in fact, NFCLink (using NCI) is exactly that, for Android or Win8 systems (in CE mode, for HCE)

otherwise, for reading, for sure it can read out HCE tag inside Android phone as well.

let us know if you need more details

CC2541 - Want to achieve 128KBPS data trasnfer - Is it possible ?

vignesh waran — Mon, 06 Jul 2015 08:37:46 GMT

Hi,

We would like to use CC2541 device in our application, where data transfer from the Bluetooth device ?(CC2541) to the Android Mobile must be 128KBPS. Atleast, it must be 64KBPS. Is it possible to achieve the same ?.

Can anyone suggest me which mode / protocol to go ahead for this ?.

Regards,

Vignesh

CC1120 Frequencies

Louis Pahlavi — Sat, 04 Jul 2015 20:18:16 GMT

Hi,

I am planning on using the CC1120 transceiver on a nano-satellite on amateur bands. We have a UHF and a VHF frequency.

My issue is that because of frequency allocation, we are restricted to using either 135MHz or 148MHz for VHF. On the CC1120 datasheet, it says it is capable to operate at those frequencies yet it is not listed in detail.

Does anyone have any idea how to use those frequencies with the CC1120?

Thanks!

Louis

RE: CC2541 - Want to achieve 128KBPS data trasnfer - Is it possible ?

vignesh waran — Mon, 06 Jul 2015 02:55:13 GMT

If it is impossible at all, to transfer data (bytes) at the rate of 64KiloBytes Per Second using CC2541, Can anyone suggest me a good BLE device to select ?

RE: CC1120 Frequencies

TER — Mon, 06 Jul 2015 00:22:21 GMT

These frequencies are placed in brackets since we haven't made a reference design covering these frequencies. The frequencies are possible to use, use SmartRF Studio to calculate the FREQ word.

SmartRF Flash Programmer v2 1.6.2 archive broken ?

Vinch — Sat, 04 Jul 2015 15:30:13 GMT

After dowloading the zip archive, my unzip tool tells me the archive is broken. Am I alone ?

RE: SmartRF Flash Programmer v2 1.6.2 archive broken ?

Igor Sherer — Sun, 05 Jul 2015 12:39:36 GMT

Nice.

Could you please mark this thread as answered.

RE: SmartRF Flash Programmer v2 1.6.2 archive broken ?

Vinch — Sun, 05 Jul 2015 12:16:01 GMT

Thank you,

At least it works with your link.

RE: SmartRF Flash Programmer v2 1.6.2 archive broken ?

Igor Sherer — Sun, 05 Jul 2015 10:28:57 GMT

Hi,

I've uploaded it to my Google drive, download it from this link (it will be available for the next 24 hours).

RE: SmartRF Flash Programmer v2 1.6.2 archive broken ?

Vinch — Sun, 05 Jul 2015 08:20:43 GMT

Hi Igor,

It seems that the file dowloading stops at 40 000 Ko (same with Chrome or IE), so the file is incomplete. Any idea ?

RE: SmartRF Flash Programmer v2 1.6.2 archive broken ?

Igor Sherer — Sun, 05 Jul 2015 01:30:56 GMT

Hi Vinch,

I've downloaded the file, and it seems to be OK, use a free version of winrar to unzip it.

bill of materials file for trf37a75

aditya bhandari — Fri, 03 Jul 2015 13:12:38 GMT

I intend to use trf37a75 as an amplifier and make a pcb for the same. Can someone please provide me the bill of materials file for the same amplifier schematic as given in the data sheet. Also is the schematic to be followed same as that given in the datasheet?

RE: bill of materials file for trf37a75

Igor Sherer — Fri, 03 Jul 2015 13:13:13 GMT

Hi,

Refer to TRF37x75EVM User's guide, section 2.2

Impedance Matching on RF board(CC2541- BLE)

Kumar Karan Jain — Tue, 09 Jun 2015 15:15:57 GMT

Hello,

We are developing RF PCB based on CC2541. We refers to tidrc156a.zip, it is dual layer postage stamp reference design guide included gerber data and drill data.

Here transmission line width is 0.3mm(Dielectric - FR4 0.8mm copper thickness 35um each layer).

For our PCB we are confused which calculator to be used to calculate transmission line width either microstrip or CPW(Co-planar wave).

Microstrip Impedance calculator reflects width of 1.41mm and

CPW calculator reflects width of 1mm.

Still these is much differencein transmission line width between the reference(tidc156a.zip) and calculator value whether it may be microstrip or CPW.

Our board specifications are:-

Dielectric width 0.8mm, copper thickness 35um, Dielectric coefficient 4.6 and operating frequency 2400MHz.

Please guide us which calculator to be used and how to calculate the transmission line width to match impedance correctly.