GB1305698A - - Google Patents

Info

Publication number
GB1305698A
GB1305698A GB1449971*[A GB1449971A GB1305698A GB 1305698 A GB1305698 A GB 1305698A GB 1449971 A GB1449971 A GB 1449971A GB 1305698 A GB1305698 A GB 1305698A
Authority
GB
United Kingdom
Prior art keywords
transistor
circuit
mixer
coupled
emitter
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
GB1449971*[A
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 filed Critical
Publication of GB1305698A publication Critical patent/GB1305698A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/16Circuits
    • H04B1/26Circuits for superheterodyne receivers
    • H04B1/28Circuits for superheterodyne receivers the receiver comprising at least one semiconductor device having three or more electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Circuits Of Receivers In General (AREA)
  • Amplifiers (AREA)

Abstract

1305698 Transistor radio receiving circuits MOTOROLA Inc 12 May 1971 [28 May 1970] 14499/71 Heading H3T A radio receiver includes a mixer circuit having first and second input terminals and an output terminal coupled to an I.F. utilization circuit, a local oscillator being coupled to the first input terminal of the circuit, while a radiofrequency amplifier circuit is connected in direct current series relation with the mixer circuit through an inductor connected to the second input terminal of the mixer circuit. Transistor 72 constitutes an R.F. amplifier in common emitter connection being fed from terminal 12a via tuned circuit 80, 81; its collector is connected via a signal-tuned circuit comprising inductor 76 and capacitor 79 to the emitter of transistor 73 which constitutes the mixer. In a first embodiment (Fig. 2, not shown) the R.F. transistor obtains a fixed base bias, and is neutralized by means of a capacitor connected between its base and the emitter of the mixer transistor. Transistor 87 constitutes the local oscillator, its emitter circuit comprising resistor 98 and being coupled to piezo-electric crystal 97 shunted by inductor 87; this is coupled by way of tuned circuit 90, 92, 93 to the collector of transistor 87. Local oscillations are injected on the base of transistor 73: the arrangement may employ continuously tunable circuits in order to cover a frequency band. The base bias for the oscillator 87 is derived via a D.C. amplifying transistor 78 from the emitter voltage of the mixer transistor 73. The collector circuit of mixer transistor 73 comprises a resistor 83 shunted by capacitor 84 and is D.C. coupled via diode 102 to the base of a first I.F. amplifying transistor 100; this is D.C. coupled to a second I.F. amplifying transistor 106, from the collector potential of which a base bias for the transistor 72 is derived over a line 113.
GB1449971*[A 1970-05-28 1971-05-12 Expired GB1305698A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US4138370A 1970-05-28 1970-05-28

Publications (1)

Publication Number Publication Date
GB1305698A true GB1305698A (en) 1973-02-07

Family

ID=21916219

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1449971*[A Expired GB1305698A (en) 1970-05-28 1971-05-12

Country Status (6)

Country Link
JP (1) JPS527889B1 (en)
CA (1) CA944026A (en)
FR (1) FR2090340B1 (en)
GB (1) GB1305698A (en)
HK (1) HK57577A (en)
IL (1) IL36893A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210224A (en) * 1987-09-18 1989-06-01 Marconi Co Ltd Mixer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2210224A (en) * 1987-09-18 1989-06-01 Marconi Co Ltd Mixer
US4977617A (en) * 1987-09-18 1990-12-11 The Marconi Company Limited Mixer
GB2210224B (en) * 1987-09-18 1992-01-22 Marconi Co Ltd Mixer

Also Published As

Publication number Publication date
CA944026A (en) 1974-03-19
DE2126427A1 (en) 1972-02-03
IL36893A (en) 1974-12-31
FR2090340B1 (en) 1976-12-03
JPS527889B1 (en) 1977-03-05
FR2090340A1 (en) 1972-01-14
IL36893A0 (en) 1971-07-28
DE2126427B2 (en) 1976-05-06
HK57577A (en) 1977-11-25

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee