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Suitability of CC1190 as Range Extender for 400MHz band???

Nathan K
Prodigy 30 points
Other Parts Discussed in Thread: CC1190, CC1010

I'm involved with product development requiring increased power in a licenced portion of the 400Mhz band. Would it be possible to use the CC1190 as a RF front end in this band to increase the link budget? I've noticed that the Block Diagram doesn't show a band pass filter, and the first feature is "Seamless Interface to Sub-1 GHz Low Power RF Devices from Texas Instruments". This leads me to think that it may work in the 400 band. Can anyone confirm or deny this.

We are currently using the CC1010, however may move to a suitable replacement chip if possible.

Thanks in advance for your responces,

Cheers,

Nathan Keilar

Lead Project Engineer
Center for Wireless Monitoring and Applications
Griffith University, Brisbane, Australia

  • 0
    Intellectual 930 points

    Hi Nathan,

    The CC1190 is only specified to work from 850MHz to 950MHz and the plot of gain vs. frequency for the LNA shown in the datasheet only covers 850 - 950 MHz. You can see that the frequency response starts rolling off at either end so it looks like a tuned amplifier rather than a wideband amplifier. The PA gain is flatter over the frequency range shown but again it only shows between 850 - 950 MHz. So it might work but probably not very well.

    Russ

     

  • 0
    Prodigy 30 points

    Alternatively can anyone suggest a low cost, low complexity way to achieve the same results?

  • 0 in reply to Nathan K
    Expert 1835 points

    I had a similar request for greater range prior to release of the 1190. We only amplified the transmitted signal. On the receive side, there was a little loss through the RF switches, but with a watt + of transmitter power, it did not seem to matter much.

    Ron

  • 0 in reply to Nathan K
    Intellectual 930 points

    Hi Nathan,

    I don't know of any single chip front-end part for the 400MHz range but it can be done with three or four ICs - two RF switches, one power amp, and one low noise amp for receive if you want to improve the receive sensitivity as well. If you increase the transmit power there may be some extra filtering required too, depending on you regulatory requirements. That would be true even if you found a single chip solution for 400MHz though so any solution would likely require some custom RF design. 

    If you need some help with a custom front-end design for your product I may be able to help you. My company is Pacific Design Engineering - see http://www.pde.com. We are a TI Elite Design House and have done a number of custom designed front-ends for 2.4GHz, 5.8GHz, and 900MHz products using Chipcon transceivers as well as dealing with the regulatory issues. You can contact me through my profile here at the TI community if you want.

    Russ