NL7404661A - Tuning circuit for radio receiver - has smoothing circuit with zener diode and condensers forming digital analogue converter feeding oscillator - Google Patents

Tuning circuit for radio receiver - has smoothing circuit with zener diode and condensers forming digital analogue converter feeding oscillator

Info

Publication number
NL7404661A
NL7404661A NL7404661A NL7404661A NL7404661A NL 7404661 A NL7404661 A NL 7404661A NL 7404661 A NL7404661 A NL 7404661A NL 7404661 A NL7404661 A NL 7404661A NL 7404661 A NL7404661 A NL 7404661A
Authority
NL
Netherlands
Prior art keywords
zener diode
circuit
radio receiver
analogue converter
amplifier
Prior art date
Application number
NL7404661A
Other languages
Dutch (nl)
Original Assignee
Philips 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 Nv filed Critical Philips Nv
Priority to NL7404661A priority Critical patent/NL7404661A/en
Publication of NL7404661A publication Critical patent/NL7404661A/en

Links

Classifications

    • 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
    • H03J5/02—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 variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
    • H03J5/0245—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form
    • H03J5/0254—Discontinuous tuning using an electrical variable impedance element, e.g. a voltage variable reactive diode, in which no corresponding analogue value either exists or is preset, i.e. the tuning information is only available in a digital form the digital values being transfered to a D/A converter
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/18—Automatic scanning over a band of frequencies
    • H03J7/20—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element
    • H03J7/28—Automatic scanning over a band of frequencies where the scanning is accomplished by varying the electrical characteristics of a non-mechanically adjustable element using counters or frequency dividers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M1/00—Analogue/digital conversion; Digital/analogue conversion
    • H03M1/66—Digital/analogue converters
    • H03M1/82—Digital/analogue converters with intermediate conversion to time interval

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Circuits Of Receivers In General (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

The radio receiver has a high frequency input (1), connected to a mixer for intermediate frequency (3), an I;F. amplifier (7), a decoder (11) and an output speaker (13). The intermediate frequency input via an oscillator (19) is supplied by an integration circuit (43) which delivers the tuning signal (21). The main units are a signal generator power pack (23), a counter (33), timing pulse generator (35) a signal combination unit (25) an amplifier (39) and an integrator (43). The latter unit has a network with three resistors (47, 51, 55) in series, with connections points earthed by a 6-volt Zener diode (49), and two smoothing condensers (53, 57). The smoothing circuit acts as a digital-analogue integrator and is followed by an operational amplifier (59). In an alternative form, the Zener diode is replaced by a voltage stabilising integrated circuit.
NL7404661A 1974-04-05 1974-04-05 Tuning circuit for radio receiver - has smoothing circuit with zener diode and condensers forming digital analogue converter feeding oscillator NL7404661A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL7404661A NL7404661A (en) 1974-04-05 1974-04-05 Tuning circuit for radio receiver - has smoothing circuit with zener diode and condensers forming digital analogue converter feeding oscillator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7404661A NL7404661A (en) 1974-04-05 1974-04-05 Tuning circuit for radio receiver - has smoothing circuit with zener diode and condensers forming digital analogue converter feeding oscillator

Publications (1)

Publication Number Publication Date
NL7404661A true NL7404661A (en) 1975-10-07

Family

ID=19821127

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7404661A NL7404661A (en) 1974-04-05 1974-04-05 Tuning circuit for radio receiver - has smoothing circuit with zener diode and condensers forming digital analogue converter feeding oscillator

Country Status (1)

Country Link
NL (1) NL7404661A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2322482A1 (en) * 1975-08-27 1977-03-25 Sony Corp CHANNEL SELECTOR FOR TELEVISION RECEIVER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2322482A1 (en) * 1975-08-27 1977-03-25 Sony Corp CHANNEL SELECTOR FOR TELEVISION RECEIVER

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