US1948315A - Superregenerative receiver - Google Patents

Superregenerative receiver Download PDF

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Publication number
US1948315A
US1948315A US543925A US54392531A US1948315A US 1948315 A US1948315 A US 1948315A US 543925 A US543925 A US 543925A US 54392531 A US54392531 A US 54392531A US 1948315 A US1948315 A US 1948315A
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United States
Prior art keywords
circuit
tubes
input
coil
signal
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US543925A
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English (en)
Inventor
Walter Van B Roberts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RCA Corp
Original Assignee
RCA Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to NL36753D priority Critical patent/NL36753C/xx
Priority to NL50648D priority patent/NL50648B/xx
Priority to NL29729D priority patent/NL29729C/xx
Priority to US351411A priority patent/US1982694A/en
Priority to GB9704/30A priority patent/GB341786A/en
Priority to DE1930555709D priority patent/DE555709C/de
Priority to US543925A priority patent/US1948315A/en
Application filed by RCA Corp filed Critical RCA Corp
Priority claimed from US591073A external-priority patent/US2008261A/en
Priority to GB16708/32A priority patent/GB385525A/en
Priority to DER85146A priority patent/DE583710C/de
Priority to DER87171D priority patent/DE610467C/de
Priority to GB3649/33A priority patent/GB403241A/en
Application granted granted Critical
Publication of US1948315A publication Critical patent/US1948315A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • VAN B ROBERTS SUPERREGENERATIVE RECEIVER Filed June 12, 1931 2 Sheets-Sheet 1 fffD 546K I mam INVENTOR WALTER VAN B. ROBERTS ATTORNEY Feb. 20, 1934. w. VAN B. ROBERTS 1,948,315
  • the present invention relates to regenerative systems, and more particularly to improved super-regenerative receiving circuits.
  • one of the main objects of my present invention is to provide a method of, and means for, producing superregeneration in a receiving circuit including a pair of oppositely connected space discharge tubes, the method consisting in applying simultaneously both signal energy and a low frequency interrupting voltage in a differential manner to the inputs of said tubes, and coupling the common output circuit of said tubes to the signal input circuit.
  • Another important object of the present invention is to provide a method of controlling a super-regenerative receiver which consists in causing signals to be regenerated by one means, employing an independent means for degenerating the signals, periodically controlling the relative effectiveness of the two means, and adjusting the degree of super-regeneration by adjusting the length of the period of time during which regenerative action is effective.
  • Another cbject of the invention is to provide a system including a means for collecting radio frequency signals, a balanced modulator circuit, a relatively low frequency modulating voltage, and means for feeding back to the signal collecting means the side bands at radio frequency produced by modulation.
  • Still another object of the present invention is to provide an arrangement in a system wherein a balanced modulator circuit, a signal collecting circuit, a relatively low frequency modulating voltage source, and means for feeding back to the signal circuit the side bands at radio frequency produced by modulation is utilized, whereby the amount of side band feed-back isv adjustable, and the strength of side'bands created is controlled.
  • Still other objects of the present invention are to improve generally the simplicity and efficiency of super-regenerative receiving circuits, and to particularly provide receiving systems of the super-regenerative type which are not only reliable in operation, but economically manufactured and assembled.
  • Fig. 1 diagrammatically shows a circuit embodying the present invention
  • Fig. 2 diagrammatically illustrates a modified form of the present invention
  • Fig. 3 shows another modification
  • Fig. 4 diagrammatically shows still another modification of the invention.
  • Fig. 1 shows a source of low frequency interrupting current F differentially coupled to the input circuits of a pair of oppositely connected space discharge tubes 1, 2.
  • the source of interrupting current is not shown, and may comprise any type of audio frequency oscillator well known to those skilled in the art, the interrupting frequency preferably having a magnitude of 6700 cycles, source F including means for adjusting the strength of the voltage applied to coil 4.
  • the signal collecting circuit comprises a split inductance-coil including the portions L1, L2, 2. variable condenser C being connected across the said inductance portions.
  • the variable condenser is preferably of the Remler type, and is well known to those skilled in the art as being electrically symmetrical.
  • each tube is connected to a terminal of each inductance portion,.the remaining terminal of each portion being connected to a terminal of a fixed capacity 3, the latter being connected in series between the portions L1, L2.
  • the fixed capacity 3 is preferably given a value of 0.006 micro-micro-farads, and is connected in shunt with an inductance coil 4, the latter being coupled to a smaller inductance coil 5 which has the source F of low frequency interrupting current connected to it.
  • the coil 5 is rated at 17.5 milli-henries, while the coil 4 is rated at 114-. milli-henries. About 1.5 volts may be applied across the coil 5.
  • Bias is provided for the grids of the tubes by means of an adjustable current source 6, the negative terminal of which source is adjustably connected, as at 'l, to the inductance coil 4, while the positive terminal of said source is connected to the grounded, common, cathode lead of said tubes.
  • an adjustable current source 6 the negative terminal of which source is adjustably connected, as at 'l, to the inductance coil 4, while the positive terminal of said source is connected to the grounded, common, cathode lead of said tubes.
  • each tube has connected in series with it a feed-back inductance coil 8, 8.
  • Positive potential is applied to the anodes of the tubes from a source B, the latter having its negative terminal connected to the cathodes, while its positive terminal is connected in series with each coil 8, 8 through a signal utilization means 9, such as a pair of head phones.
  • a fixed radio frequency icy-pass condenser 10 preferably having a magnitude of about 0.006 micro-micro farads, is connected in parallel to head phones 9.
  • the coil 8 is coupled for regenerative feed-back to the coil L1, L2, while the coil 8 is also coupled to coilLi, L2, but in such sense as to provide the .reverse feed-back action for rapid quenching of radio frequency oscillations during the damping period, without introducing appreciable damping into the oscillation circuit during the regeneratively amplifying, or building up, period.
  • the circuit shown in Fig. 1 operates most efiiciently with well matched tubes.
  • an antenna is not needed, a three inch tuning coil at L1, L2 having been found to supply plenty of signal pick-up. For long wave broadcast stations it is merely necessary to utilize more capacityacross the coil 4, and a correspondingly lower interruption frequency at the source F.
  • the grid of tube 1 is then only slightly negative, and, due to the action of the feed-back coil 8 and the inductance portion L1, the tube 1 builds up oscillations in the radio frequency circuit, the amplitude at a given time depending upon signal input.
  • the grid of tube 1 becomes very negative, while the grid of tube 2 becomes only slightly negative. This results in the reverse feed-back coil 8, building down or positively quenching the oscillations, thus taking the place of ohmic resistance in quenching oscillations at the interrupting frequency.
  • the advantage of differentially coupling the signal collecting circuit, as well as the interrupting frequency circuit, to the input of tubes 1 and 2 is that stray, or circuit, capacities across the signal tuned circuit may thereby be reduced to a minimum, thus allowing the signal circuit to tune efficiently to very high frequencies.
  • FIG. 2 A modified form of the present invention is shown in Fig. 2 wherein the oppositely connected tubes are provided with a signal collecting circuit differentially connected to the common input of the tubes.
  • the source of interrupting frequency F is coupled to the inductance coil 7 by means of the coil 5.
  • the coupling between the coils 5 and 7 is adjustable, as at M.
  • the anode of each tube is adjustably connected, by means of sliding contacts 11, ll to feed-back coil 8", the latter having one of its terminals connected to the common lead of the cathodes of the tubes through the fixed by-pass condenser 10.
  • the portions L1 and L2 are provided by split-- ting a single inductance coil at its mid-point, the large inductance coil 7 preferably being tapped near its mid-point as well.
  • the feed-back coil 8 may have the anodes connected to diiierent points thereof, but nevertheless operates efiieiently with both anodes connected to its right hand terminal.
  • the coil 8 is, preferably, permanently fixed with respect to the coil L1, L2, and, for example, may be concentric and coaxial therewith. It is to be noted that the circuit including the large inductance coil 7 and the fixed capacity 3, together with incidental capacities, is maintained fixedly tuned to the interrupting frequency F.
  • the magnitude of the source 6 is preferably, so adjusted as to make the anode currents at both tubes zero, or very small, in the absence of intermediate frequency input.
  • an antenna circuit may be employed in conjunction with the signal input circuit, the antenna circuit being conventionally represented as including capacities 13, 13' in series with each inductance portion L1, L2.
  • Fig. 2 there has been shown a method of controlling super-regeneration which consists in causing signals to be regenerated by one means, and to be degenerated by another means, the relative effectiveness of the two means being periodically switched, while, by means of the adjustable coupling M, the amount of shift of relative effectiveness is utilized for controlling the strength of regeneration.
  • the arrangement shown in Fig. 2 may also be lei explained as comprising a balanced -modulator circuit wherein there is employed a means for collecting radio frequency signal energy, and a relativelylow frequency modulating voltage supplied by a source F, the coil 8 functioning for feeding back to the radio frequency signal circuit the side bands at radio frequency produced by modulation. That such a balanced modulator circuit is involved in the arrangement shown in Fig. 2 may be demonstrated from the following considerations:
  • K denotes the constant negative potential due to the control grid biasing potential source 6 in Fig. 2.
  • Es denotes the potential due to the signal energy.
  • EF denotes the potential due to the source of interruption frequency energy of frequency F.
  • the plate currents may be expressed as power series of grid voltages. If the taps ll, 11 are both at the right hand end of the coil, the signal frequency currents, and the interruption frequency currents will both cancel in coil 8". But due to the second order term, currents representing the product ESEF will flow from both tubes through 8" in like phase. These currents include currents of frequencies fsiF, that is, the side bands generated by the modulation of a signal by the low frequency Fig. 2 shows a means for feeding back these side bands without feeding back the signal frequency.
  • Fig. 2 may be described as showing a balanced modulator circuit whose output side bands are coupled back to its input high frequency circuit.
  • FIG. 3 A further modification, involving a simplified circuit structure, is shown in Fig. 3.
  • This modified form of construction does not employ an inductive coupling between the source of interrupting frequency F and the common input of the tubes 1, 2, but instead the source F is directly connected across the fixed capacity 3.
  • the negative terminal of the grid biasing source 6 is adiustably connected, as at 20 to a fixed resistor 21.
  • the latter preferably, has a magnitude of about 20,000 ohms, the resistor being shunted across the condenser 3.
  • the amount of super-regeneration may be controlled by varying the coupling of coil 8" to coil L1, L2 by varying the voltage of bias source 6, or by varying the amount of voltage output of source F.
  • the modification shown in Fig. 4 comprises a differentially connected signal input circuit which however does not require a split coil, but a coil L3.
  • the diiferentially applied interruption voltage is, in this case, applied in the plate circuit through transformer M1.
  • the secondary 30 of thelatter is shunted by radiofreq'uencyby-pass series condensers 31, 32.
  • the action' is the same as in Fig. 3 'except'that a greater voltage must be applied in the plate circuit to cause as great a change in the amounts of feed back of the tubes than when applied in the grid circuit.
  • the advantage possessed by the modification in-Fig. l lies chiefly in the simplificationof the input circuit and the signal frequency tuning coil system.
  • a pair of oppositely connected spacedischarge tubes having a common input and output circuit, a signal circuit, an interrupting frequency source, said signal circuit and source being differentially connected to the input circuit of said tubes, the common output circuit'of said tubes being coupled to said signal circuit.
  • a pair of oppositely connected space discharge tubes having a common input and output circuit, a signal circuit, an interrupting frequency source, said signal circuit and source being differentially connected to the input circuit of said tubes, the common output circuit of said tubes being differentially coupled to said signal circuit.
  • the method of controlling a super-regenerative receiver which consists in collecting signal energy, differentially applying the energy to the input circuits of a pair of space discharge tubes, regenerating the signals by one of said tubes, degenerating the signals by the other tube, periodically switching the relative effectiveness of the two tubes, and controlling the strength of super-regeneration by the amount of shift of said relative effectiveness.
  • means for collecting radio frequency signals a balanced modulator circuit having its input coupled to the signal collecting means, a source of relatively low frequency modulating voltage coupled to said circuit, and means for feeding back from the circuit output to said signal collecting means the side bands at radio frequency produced by modulation, and means for adjusting the amountof feed back of said side bands.
  • a super-regenerative receiver ya pair of electron discharge tubes having input and out- .put circuits, the two input circuits having a common portion including a tuned circuit and the two output circuits having a common portion including a load circuit, a source of signal energy connected to said common tuned circuit, to impress signal energy upon the input circuits of said tubes in unlike sense, a source of interruption frequency waves diilerentially coupled to both said input circuits, means for coupling the output circuit of one of said tubes to its input circuit in a regenerative sense, and means for coupling the output and input circuits of the other tube in a degenerative sense.
  • a pair of electron discharge tubes having input and output circuits, the two input circuits having a common portion including a tuned circuit and the two output circuits having a common portion including a load circuit, a source of signal energy connected to said common tuned circuit, to impress signal energy upon the input circuits of said tubes in unlike sense, a source of intenruption frequency waves differentally coupled to both said output circuits, means for coupling the output circuit of one of said tubes to its input circuit in a regenerative sense, and means for coupling the output and input circuits of the other tube in a degenerative sense.
  • a of electron discharge tubes having input and output circuits, the two input circuits having a common portion including a tuned circuit and the two output circuits having a common portion including a load circuit, a source of signal energy connected to said common tuned circuit, to impress signal energy upon the input circuits of said tubes in unlike sense, a source of interruption frequency waves difierentially coupled to both said input circuits, means for coupling the output circuit of one of said tubes to its input circuit in a regenerative sense, and means for coupling the output and input circuits of the other tube in a degenerative sense and means for varying the coupling between said interruption frequency source and said input circuits.
  • a pair of electron discharge tubes having input and output circuits, the two input circuits having a common portion including a tuned circuit and the two output circuits having a common portion including a load circuit, a source of signal energy connected to said common tuned circuit, to impress signal energy upon the input circuits of said tubes in unlike sense, a source of interruption frequency waves differentially coupled to both said input circuits, means for coupling the output circuit of one of said tubes to its input circuit in a regenerative sense, and means for coupling the output and input circuits of the other tube in a degenerative sense, said last two mentioned means consisting of a single coil connected to both said output circuits.
  • a pair of electron discharge tubes having input and output circuits, the two input circuits having a common portion including a tuned circuit and the two output circuits having a common portion including a load circuit, a source of signal energy connected to said common tuned circuit, to impress signal energy upon the input circuits of said tubes in unlike sense, a source of interruption frequency waves differentially coupled to both said input circuits, means comprising an inductance coil for coupling the output circuitv of one of said tubes to its input circuit in a regenerative sense, and means comprising the said coil for coupling the output and input circuits of the other tube in a degenerative sense,
  • said output circuits being variably connected to said coupling coil.
  • a pair of electron discharge tubes including means for tuning the latter through a signal frequency range, connected to the signal control grids of the tubes, a connection between the anodes of said tubes, said connection including at least one coil regeneratively coupled to said resonant input circuit, and a source of interruption frequency energy coupled to the said connection.
  • a pair of electron discharge tubes a resonant circuit, including means for tuning the latter through a signal frequency range, connected to the signal control grids of the tubes, a connection between the anodes of said tubes, said connection including at least one coil regeneratively coupled to said resonant input circuit, and a source of interruption frequency energy differentially coupled to the said connection.
  • a pair of tubes a tunable signal circuit connected to the control grids of both tubes, 2. common output circuit connected to the anodes of both tubes, said common output circuit includin only a single coil coupled to the tunable circuit, and a source of interruption frequency energy differentially coupled to the said control grids.

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US543925A 1929-03-30 1931-06-12 Superregenerative receiver Expired - Lifetime US1948315A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
NL36753D NL36753C (en(2012)) 1931-06-12
NL50648D NL50648B (en(2012)) 1931-06-12
NL29729D NL29729C (en(2012)) 1931-06-12
US351411A US1982694A (en) 1929-03-30 1929-03-30 Superregenerative receiver
GB9704/30A GB341786A (en(2012)) 1931-06-12 1930-03-26
DE1930555709D DE555709C (de) 1931-06-12 1930-03-28 Superregenerativschaltung
US543925A US1948315A (en) 1931-06-12 1931-06-12 Superregenerative receiver
GB16708/32A GB385525A (en) 1931-06-12 1932-06-13 Improvements in regenerative radio and similar high frequency receivers
DER85146A DE583710C (de) 1931-06-12 1932-06-14 Superregenerativschaltung
DER87171D DE610467C (de) 1931-06-12 1933-02-05 Superregenerativschaltung
GB3649/33A GB403241A (en) 1931-06-12 1933-02-06 Improvements in or relating to super-regenerative circuit arrangements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US543925A US1948315A (en) 1931-06-12 1931-06-12 Superregenerative receiver
US591073A US2008261A (en) 1932-02-05 1932-02-05 Superregenerative circuits

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US1948315A true US1948315A (en) 1934-02-20

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US543925A Expired - Lifetime US1948315A (en) 1929-03-30 1931-06-12 Superregenerative receiver

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US (1) US1948315A (en(2012))
DE (3) DE555709C (en(2012))
GB (3) GB341786A (en(2012))
NL (3) NL36753C (en(2012))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525529A (en) * 1945-12-08 1950-10-10 Hartford Nat Bank & Trust Co Circuit arrangement for superregenerative reception
US2625650A (en) * 1948-10-16 1953-01-13 Sperry Corp Superregenerative apparatus
US2691099A (en) * 1946-02-14 1954-10-05 Jesse R Lien Superregenerative receiveroscillator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2525529A (en) * 1945-12-08 1950-10-10 Hartford Nat Bank & Trust Co Circuit arrangement for superregenerative reception
US2691099A (en) * 1946-02-14 1954-10-05 Jesse R Lien Superregenerative receiveroscillator
US2625650A (en) * 1948-10-16 1953-01-13 Sperry Corp Superregenerative apparatus

Also Published As

Publication number Publication date
DE583710C (de) 1933-09-08
NL50648B (en(2012))
GB341786A (en(2012)) 1931-01-22
GB385525A (en) 1932-12-29
GB403241A (en) 1933-12-21
NL36753C (en(2012))
DE610467C (de) 1935-03-11
NL29729C (en(2012))
DE555709C (de) 1932-07-27

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