The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> RF Design >> Algorithmic Amplifier https://designers-guide.org/forum/YaBB.pl?num=1437592859 Message started by mike433 on Jul 22nd, 2015, 12:20pm |
Title: Algorithmic Amplifier Post by mike433 on Jul 22nd, 2015, 12:20pm Hi This is the first time for me to encounter the "logarithmic amplifier", i searched it but didn't find much information. Can any one please provide summary/explanation about what does it do and most importantly why it is used for RSSI measurements (I thought it would be used for amplification as the name suggests). Thx. Mike |
Title: Re: Algorithmic Amplifier Post by loose-electron on Jul 23rd, 2015, 6:07pm log amps get used for RSSI because for small signals you get a lot of gain and for big signals you get little gain. They are cascades of multiple limited gain range amplifiers. Consequently they are useful when dealing with a wide dynamic range signal. Accuracy is dependent on the number of cascaded gains stages. Fewer stages makes for less accuracy, more stages get you a better log gain transfer curve. There are papers in the IEEE JSSC but they are probably over 20 years back. Start digging. |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |