This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
I'm a student Electronics and still new to Texas Instruments. I've been trying to find a suitable VGA for what i need, but I can't seem to find it. I do not have much expertise working with amplifiers yet, so it might be that I am missing some basic knowledge of what is available and what is possible. I'm making a receiver that receives signals of 150MHz, it has been through 2 mixers and brought down to near DC and now requires the gain to be variable. This is due to the fact that the transmitter has parts that are unknown (and stay unknown).
I'm looking for a Variable Gain Amplifier (or PGA maybe) that is single in/single out and works for a frequency of around 10k-100kHz. It should have a total gain range of at least 30 dB or more, (this might be 0-30, or -15 to 15) Unfortunately when I look at the search list for VGA, it doesnt show an option for min/max frequencies. Most chips I find have a minimum frequency well above what I need or are differential inputs/outputs.
I do not know how to change a differential to a single input or output (connecting 1 of them to ground works?).
I hope someone might help me or shed some light on what i should be looking for. If any more information is required, i'll happily provide it.
With kind regards,
It sounds from your description that a linear voltage-controlled amplifier (VCA) may be an appropriate solution. The one device that comes to mind is the VCA810. You can find more information about it here:
Another possibility is the LMH6503 variable gain amplifier (VGA):
Both of these amplifiers have wide bandwidth and are completely usable at 100 kHz.
Please note that these amplifiers are supported by the High-Speed Amplifier products group. If you have any questions about using one of these devices there is the High-Speed Amplifiers E2E froum where you can post your questions. They should be able to assist you.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with respect to these materials. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.