JPS5527768A - Signal reception circuit - Google Patents

Signal reception circuit

Info

Publication number
JPS5527768A
JPS5527768A JP10108078A JP10108078A JPS5527768A JP S5527768 A JPS5527768 A JP S5527768A JP 10108078 A JP10108078 A JP 10108078A JP 10108078 A JP10108078 A JP 10108078A JP S5527768 A JPS5527768 A JP S5527768A
Authority
JP
Japan
Prior art keywords
circuit
antenna
tuning
capacity
antenna terminal
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.)
Granted
Application number
JP10108078A
Other languages
Japanese (ja)
Other versions
JPS6119140B2 (en
Inventor
Kenzo Tanabe
Masabumi Serizawa
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP10108078A priority Critical patent/JPS5527768A/en
Publication of JPS5527768A publication Critical patent/JPS5527768A/en
Publication of JPS6119140B2 publication Critical patent/JPS6119140B2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line

Landscapes

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

Abstract

PURPOSE:To reduce the sensitivity change at the antenna circuit part to cover the entire tuning band as well as to prevent the disturbance by leading the pi-matching circuit between the antenna terminal and the 1st-step input amplifier via the LC circuit in the AM car radio set. CONSTITUTION:Variable capacity element C4 is provided at the antenna input circuit part in order to increase the input impedance at 1st-step amplification part A and to vary the frequency for selection and amplification. And fixed capacity element C3 featuring a larger capacity than the maximum value of element C4 is installed in parallel to the antenna terminal part, and as a result the variable range of the tuning frequency is increased to secure coverage over the entire band region. In addition, inductor L2 featuring the inductance suited to give a selective reception for the reception frequency range in cooperation with elements C3 and C4 is connected in parallel to the antenna terminal part, thus constitution the pi-matching circuit. Accordingly, the capacity of the parallel arrangement of C2 and C3 is shown by C23, and thus the sensitivity slope can be eliminated up to part A regardless of variation of C4 by increasing C23 more than the maximum value of C4. Furthermore, the cross modulation and the image disturbance can be avoided owing to the selective tuning circuit.
JP10108078A 1978-08-18 1978-08-18 Signal reception circuit Granted JPS5527768A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10108078A JPS5527768A (en) 1978-08-18 1978-08-18 Signal reception circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10108078A JPS5527768A (en) 1978-08-18 1978-08-18 Signal reception circuit

Publications (2)

Publication Number Publication Date
JPS5527768A true JPS5527768A (en) 1980-02-28
JPS6119140B2 JPS6119140B2 (en) 1986-05-15

Family

ID=14291114

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10108078A Granted JPS5527768A (en) 1978-08-18 1978-08-18 Signal reception circuit

Country Status (1)

Country Link
JP (1) JPS5527768A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63109035U (en) * 1987-01-07 1988-07-13
JPH0224125U (en) * 1988-06-30 1990-02-16

Also Published As

Publication number Publication date
JPS6119140B2 (en) 1986-05-15

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