US2317474A - Superregenerative receiver - Google Patents

Superregenerative receiver Download PDF

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Publication number
US2317474A
US2317474A US396814A US39681441A US2317474A US 2317474 A US2317474 A US 2317474A US 396814 A US396814 A US 396814A US 39681441 A US39681441 A US 39681441A US 2317474 A US2317474 A US 2317474A
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United States
Prior art keywords
detector
output
voltage
valve
grid
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Expired - Lifetime
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US396814A
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English (en)
Inventor
Montgomery William Alan
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International Standard Electric Corp
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International Standard Electric Corp
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Publication date
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D11/00—Super-regenerative demodulator circuits
    • H03D11/02—Super-regenerative demodulator circuits for amplitude-modulated oscillations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/02—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with tubes only

Definitions

  • Id A-B loge Vi where Id is the anode current Vi is the input voltage and A and B are constants This is known as the logarithmic mode of operation. In the linear mode of operation the detector is less sensitive but the output is directly proportional to the input instead of the logarithm of the input.
  • the chief distinction between the logarithmic and linear modes of operation is in the quench frequency. If the quench frequency is sufiiciently low to allow the oscillation to build up to saturation value before being quenched the detector behaves logarithmically. If, however, the frequency is increased until the oscillations are always quenched before reaching saturation value then the detector behaves linearly.
  • This invention is concerned with the superregenerative detector in its logarithmic mode of operation.
  • the audio frequency component of the output of such a detector is logarithmic, that. is, that the, output signal frequency amplitude is proportional to the logarithm of the modulating voltage of the incoming carrier wave.
  • the magnitude of the harmonic distortion resulting from this particular kind of non-linearity is considered; it is shown that the distortion due to the logarithmic characteristic can be compensated by the use of a succeeding low-frequency amplifier having an exponential characteristic and that for complete correction a critical value of detector load impedance is necessary.
  • the second harmonic is given by:
  • Ia Ke
  • Vg the grid voltage
  • Pentodes with fairly high negative bias form suitable amplifier valves for the present purpose.
  • the Philips valve type E.452T has an exponential characteristic with grid bias voltages between 9 and -3.
  • the anode current of a typical super-regenerative detector is given by:
  • the receiver comprises a super-regenerative 1? detector stagehaving a triode valve VI with a then tuned input circuit LI, Cl connected between grid 2(1 +1 cos t) and anode an intermediate point of this circuit .
  • I AQL 1 +V1W' being at ground or cathode potential for high frequencies.
  • a quenching voltage wave is applied across a condenser C2 which is inserted in series with a grid leak R3, whereby a pulse is applied to grid periodically to quench the oscillation after it has built up to saturation point.
  • the output of the detector valve is applied by resistance-capacity coupling RI, C3, R4 to the control-grid of a pentode amplifying valve V2.
  • the connections to this valve are of well-known kind but the grid bias voltage is critically determined by suitable choice of resistance values in the potentiometer R5, R6, R1 to ensure that the valve operates over an exponential part of its grid characteristic.
  • a receiver of modulated carrier waves comprising a super-regenerative wave detector where- .in the quench frequency is sufiiciently low to allow the oscillation to build up to saturation value before being quenched followed by a low frequency amplifier the anode current of which is an exponent, of the grid voltage over the working range of grid voltages.
  • a receiver according to claim 1, wherein if the output current of the amplifier valve is expressed as Ke Vg being the amplifier input voltage, K and is being constants and if the detector anode current is expressed as AB loge Vi amps, Vi being the signal input voltage to the detector, A and B being constants, the detector anode-circuit load resistance has the approximate value of i Bk ohms.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)
US396814A 1940-06-25 1941-06-06 Superregenerative receiver Expired - Lifetime US2317474A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB10860/40A GB542147A (en) 1940-06-25 1940-06-25 Improvements in or relating to super-regenerative receivers

Publications (1)

Publication Number Publication Date
US2317474A true US2317474A (en) 1943-04-27

Family

ID=9975650

Family Applications (1)

Application Number Title Priority Date Filing Date
US396814A Expired - Lifetime US2317474A (en) 1940-06-25 1941-06-06 Superregenerative receiver

Country Status (4)

Country Link
US (1) US2317474A (enrdf_load_stackoverflow)
BE (1) BE476536A (enrdf_load_stackoverflow)
ES (1) ES177222A1 (enrdf_load_stackoverflow)
GB (1) GB542147A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513968A (en) * 1947-11-04 1950-07-04 Philco Corp Superregenerator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2513968A (en) * 1947-11-04 1950-07-04 Philco Corp Superregenerator

Also Published As

Publication number Publication date
ES177222A1 (es) 1947-04-16
BE476536A (enrdf_load_stackoverflow)
GB542147A (en) 1941-12-29

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