GB613681A - Improved circuit arrangements for the amplification or frequency-transformation of electrical oscillations - Google Patents

Improved circuit arrangements for the amplification or frequency-transformation of electrical oscillations

Info

Publication number
GB613681A
GB613681A GB19079/46A GB1907946A GB613681A GB 613681 A GB613681 A GB 613681A GB 19079/46 A GB19079/46 A GB 19079/46A GB 1907946 A GB1907946 A GB 1907946A GB 613681 A GB613681 A GB 613681A
Authority
GB
United Kingdom
Prior art keywords
frequency
circuit
inductance
signal
valve
Prior art date
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
Application number
GB19079/46A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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
Application filed by Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB613681A publication Critical patent/GB613681A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
    • H03F1/28—Modifications of amplifiers to reduce influence of noise generated by amplifying elements in discharge-tube amplifiers

Abstract

613,681. Valve circuits for radio reception. PHILIPS LAMPS, Ltd. June 26, 1946, No. 19079. Convention date, April 16, 1942. [Class 40 (v)] In a high-frequency amplifier (Fig. 1) the signal to noise ratio is improved by means of positive feedback over an inductance 5 in the cathode circuit, where the distribution noise is absent. The circuit is maintained stable by means of negative feedback over an inductance 6 in the anode circuit. An arrangement for a frequency-changing circuit (Fig. 2) is based upon the better signal to noise ratio in the anode circuit for signal frequency than for the intermediate frequency, due to the mutual conductance being greater than the conversion conductance. Positive feedback is taken from an inductance 5 and negative feedback from the intermediate frequency output circuit 4 via a second mixer 10 in which the signal frequency is regained by beating against the local oscillator 7. In a modification (Fig. 3, not shown), the inductance 5 is placed in the cathode lead of the frequency changer and the valve 10 serves in addition as an intermediate-frequency amplifier. The undesired coupling which the valve 10 provides between the local oscillator and the input circuit may be neutralized by means of a compensating coupling.
GB19079/46A 1942-04-16 1946-06-26 Improved circuit arrangements for the amplification or frequency-transformation of electrical oscillations Expired GB613681A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL245848X 1942-04-16
NL2486076X 1943-02-23

Publications (1)

Publication Number Publication Date
GB613681A true GB613681A (en) 1948-12-01

Family

ID=32232797

Family Applications (1)

Application Number Title Priority Date Filing Date
GB19079/46A Expired GB613681A (en) 1942-04-16 1946-06-26 Improved circuit arrangements for the amplification or frequency-transformation of electrical oscillations

Country Status (6)

Country Link
US (1) US2486076A (en)
BE (1) BE450187A (en)
CH (1) CH245848A (en)
FR (2) FR894004A (en)
GB (1) GB613681A (en)
NL (1) NL60694C (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE484347A (en) * 1947-08-14
BE484503A (en) * 1947-08-25
US2662939A (en) * 1949-04-02 1953-12-15 Nowak Karl High selectivity amplifier
US2659776A (en) * 1949-05-13 1953-11-17 Nowak Karl Selective receiving and amplifying circuit
US2662172A (en) * 1950-02-21 1953-12-08 Sperry Prod Inc Oscillator cancellation frequency converter
US2713118A (en) * 1951-05-04 1955-07-12 Robert W Hart Communication system
US2963660A (en) * 1954-04-02 1960-12-06 Northrop Corp Signal frequency converter
DE1081514B (en) * 1957-02-05 1960-05-12 Deutsche Bundespost Broadband amplifier stage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB509398A (en) * 1937-12-14 1939-07-14 James Robinson Improvements in retroactive valve apparatus
US2227604A (en) * 1938-01-29 1941-01-07 Rca Corp Ultra high frequency device
US2256067A (en) * 1938-05-27 1941-09-16 Rca Corp Receiver selectivity control

Also Published As

Publication number Publication date
BE450187A (en)
US2486076A (en) 1949-10-25
CH245848A (en) 1946-11-30
FR894004A (en) 1944-12-12
NL60694C (en)
FR53342E (en) 1945-10-16

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