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SUPRX High Performance FM Radio Receiver

This is a link to a PDF file which displays a SUPRX FM radio receiver circuit diagram (schematic), block diagram, and discusses circuit operation in great detail.

NOTE: This PDF document containing the circuit diagram appears to have been removed from the internet, and it is no longer available. This page is maintained for historical purposes only. Sorry. The URL used to be: http://www.electronic-projects.net/Schematics/FM_RCVR/FM_RCVR.pdf (try it from time-to-time to see if it comes back.)

One of the fundamental parameters governing radio receiver performance is its sensitivity. This article discusses an, FM radio receiver design, called SUPRX, which overcomes sensitivity deficiencies. The approach is to optimize carefully the strong signal wideband characteristics of the receiver front end and mixer. The objective is to maintain front-end weak signal sensitivity when the receiver is subjected to adjacent channel high-level signals. For this article this will be referred to as the "apparent sensitivity" of the radio.

Another concern is intermediate frequency (IF) harmonic distortion. As this article suggests, careful selection of components can provide acceptably low levels of distortion. A means for simulating the signal environment in a controlled and repeatable way is also shown, as is a way to make use of this method for the stage and integrated receiver-level evaluations.

  • Tuning voltage: 7 to 30 V
  • IF frequency: 10.7 MHz
  • IF bandwidth: 200 kHz
  • Capture ratio: 1.9 dB
  • Baseband frequency response: 10 Hz to 100 kHz +/-1 dB
  • Harmonic distortion: -65 dB second and third harmonics using 6 kHz modulation and +/-75 kHz deviation
  • Dynamic range: 110 dB
  • Demodulator output level: 1 V p to p for 100% modulation
  • Demodulator output impedance: 1000 Ohms
Alternate References:
georgewilliam says: (February 15 2008, 8:34am)

Thanks for this web link but where is the pdf files for the Circuit?

ElectroKits says: (February 15 2008, 2:43pm)

Hi George,

I think the website that hosts the PDF file is temporarily down. I'll check it later to see if it's recovered. If not I'll remove the link. Note that you normally get to the PDF by clicking on the headline of this page, which is a link.

jibranbhat07 says: (February 15 2008, 3:11pm)

Very Good electronics circuits

sarrks007 says: (February 23 2008, 2:36pm)

cool one.....with fm features..... Easy to use......

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