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)?
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.
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.