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At the heart of every receiver is a detector that separates signal information from noise. The TransFilter/Detector (Patent Pending US 15/127,472) is a technological break-through in Detector Sensitivity, making possible recovery of signals as small as -240 dBm. See Figure 2.

Greater sensitivity increases range and/or reduces transmitter power. Since increased sensitivity is obtained by selective reduction of in-band noise, Deep Space RADAR or Telemetry receivers may be operated at lower frequencies where path loss is lower, further increasing range, even though ambient noise is greater.

TransFilter/Detectors have no threshold. The unique Linear Time Invariant circuit topology takes advantage of the inherent orthagonalety between stationary noise (AWGN) and exponentially modulated signals. Circuit selectively distinguishes between signal and noise, reducing in-band noise while enhancing the signal. Cascading TransFilters increases noise reduction and signal enhancement. No other detector can do this. See Figure 1.

TransFilter/Detectors will be used wherever greater sensitivity improves or extends the usability of Communications Links. Use in cell phones and base stations will reduce radiated power levels significantly, making them safer for the user. Increased sensitivity reduces the need for expensive error correcting codes that reduce spectrum efficiency. The most critical application of the TransFilter will be to detect and track NEO’s (Meteorites and asteroids) while they are as distant as the orbit of Uranus, giving us time to deflect their paths and avoid impact.

The market for TransFilter/Detectors encompasses current and future markets for all types of radio receivers. While the TransFilter/Detector is only a component part of the total receiver, its proprietary nature and contribution to product performance will establish and maintain its value.

TransFilters separate input (Signal + Noise) into two paths where complimentary derivatives (opposite sign dV/dF) relative to frequency off-set from band center are extracted. The output of the two paths have opposite amplitude vs frequency slopes that are combined in a summing circuit. Output amplitudes of the two paths are equal at Fo and have opposite tracking phase shifts. Noise in the two paths is out of phase, cancelling each other completely at Fo and partially at other frequencies across the band, reducing in-band noise. At Fo output level of the two paths is reduced by 6 dB relative to input. Exponential signal components are (+dV/dF) in one path and (-dV/dF) in the other. Due to the 180 degrees phase the sum is then 2(dV/dF). However, due to the 6 dB loss signal output is (dV/dF). While noise is reduced, signal is undiminished. For digital signals the value of (dV/dF) at data transitions can be much greater, depending on system bandwidth. For phase modulated digital signals and PAM, the carrier is suppressed and polarized impulses are generated at data transitions. See Figure 2. Figure 3 is a photograph of the test setup.

Conventional manufacturing techniques involving circuit boards and discrete components will be used initially, giving way to integrated circuit techniques when quantities become larger.


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  • Name:
    Marvin Sassler
  • Type of entry:
  • Profession:
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  • Marvin is inspired by:
    The need to increase receiver sensitivity.
  • Software used for this entry:
    TESLA, Orcad
  • Patent status: