GB1135263A - Improvements in or relating to amplifier arrangements - Google Patents

Improvements in or relating to amplifier arrangements

Info

Publication number
GB1135263A
GB1135263A GB241366A GB241366A GB1135263A GB 1135263 A GB1135263 A GB 1135263A GB 241366 A GB241366 A GB 241366A GB 241366 A GB241366 A GB 241366A GB 1135263 A GB1135263 A GB 1135263A
Authority
GB
United Kingdom
Prior art keywords
frequency band
circuits
tuned
collector
transistor
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
GB241366A
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.)
Telefunken Patentverwertungs GmbH
Original Assignee
Telefunken Patentverwertungs GmbH
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 Telefunken Patentverwertungs GmbH filed Critical Telefunken Patentverwertungs GmbH
Publication of GB1135263A publication Critical patent/GB1135263A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/60—Amplifiers in which coupling networks have distributed constants, e.g. with waveguide resonators
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Amplifiers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

1,135,263. Radio receiving circuits; transistor amplifying circuits. TELEFUNKEN PATENTVERWERTUNGS G.m.b.H. 19 Jan., 1966 [3 Feb., 1965; 13 Oct., 1965], No. 2413/66. Headings H3Q and H3T. In an amplifying arrangement for use in a higher frequency band and a lower frequency band, the output electrode of an amplifying device is connected to tuned circuits for the higher frequency band via an open circuited quarter wave transmission line tuned to a frequency in the higher frequency band which attenuates in the lower frequency bands and is connected to one or more tuned circuits for the lower frequency band via a low-pass filter which attenuates in the high frequency band. As applied to a transistor R.F. amplifier in common base connection, the emitter of which is coupled by means of switch 7 to U.H.F. and V.H.F. input circuits 3, 4 respectively, the collector is coupled to a U.H.F. tuned circuit comprising quarter-wave line 21 and variable capacitor 26 by means of an open-circuited quarter wave transmission line 19. Line 19 is resonant at the upper end of the U.H.F. band. In addition the collector is coupled by means of a U.H.F. choke 12 to V.H.F. tuned circuit 13, 14. In a modification (Fig. 2, not shown), separate switched coils are provided for two V.H.F. bands, the lower end of each coil being earthed via a capacitor used to provide a tapped-down coupling point for the collector of the transistor. Alternatively the one coil may be in series with the other and provided with a short-circuiting switch (Fig. 3, not shown).
GB241366A 1965-02-03 1966-01-19 Improvements in or relating to amplifier arrangements Expired GB1135263A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DET27920A DE1213015B (en) 1965-02-03 1965-02-03 High frequency amplifier for several separate frequency ranges, especially VHF and UHF ranges
DET0029566 1965-10-13

Publications (1)

Publication Number Publication Date
GB1135263A true GB1135263A (en) 1968-12-04

Family

ID=25999989

Family Applications (1)

Application Number Title Priority Date Filing Date
GB241366A Expired GB1135263A (en) 1965-02-03 1966-01-19 Improvements in or relating to amplifier arrangements

Country Status (2)

Country Link
DE (2) DE1213015B (en)
GB (1) GB1135263A (en)

Also Published As

Publication number Publication date
DE1466532A1 (en) 1969-07-17
DE1213015B (en) 1966-03-24

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