GB2216354A - Radio receiver tuner circuit - Google Patents

Radio receiver tuner circuit Download PDF

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Publication number
GB2216354A
GB2216354A GB8807604A GB8807604A GB2216354A GB 2216354 A GB2216354 A GB 2216354A GB 8807604 A GB8807604 A GB 8807604A GB 8807604 A GB8807604 A GB 8807604A GB 2216354 A GB2216354 A GB 2216354A
Authority
GB
United Kingdom
Prior art keywords
tuner circuit
dividers
output
tuner
mixer
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
GB8807604A
Other versions
GB2216354B (en
GB8807604D0 (en
Inventor
Christoper Beale
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.)
Plessey Co Ltd
Original Assignee
Plessey 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 Plessey Co Ltd filed Critical Plessey Co Ltd
Priority to GB8807604A priority Critical patent/GB2216354B/en
Publication of GB8807604D0 publication Critical patent/GB8807604D0/en
Publication of GB2216354A publication Critical patent/GB2216354A/en
Application granted granted Critical
Publication of GB2216354B publication Critical patent/GB2216354B/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04B1/26—Circuits for superheterodyne receivers
    • 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
    • H03J5/244—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 using electronic means

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

A radio receiver tuner circuit comprising a tunable oscillator an output of which is applied through a preamplifier to two or more selectively enabled, parallel paths, each including a divider and a mixer, (8), which has a further input for receiving an incoming radio frequency signal, and each mixer output providing an intermediate frequency signal on a common output line of said tuner. The dividers may have division ratios of 1, 2, 4 and 6 and the circuit is suitable for construction as an integrated circuit. In use, only one of the paths is enabled to select the frequency band on which the receiver is to operate. <IMAGE>

Description

RADIO RECEIVER TUNER CIRCUIT This invention relates to a radio receiver tuner circuit. It relates particularly to a tuner circuit construction which may be designed to cover the full range of frequencies used in television bands for both terrestrial and cable television transmissions.
In the design of a radio receiver tuner it is necessary to generate a specified frequency by means of a local oscillator and this frequency is then mixed with an incoming radio frequency signal to provide an intermediate frequency for the later stages of the receiver. Tuning of the receiver is effected by adjustments of the local oscillator output frequency so that suitable different frequency ranges will be provided to allow the incoming radio frequency bands to be processed as intermediate frequencies.
The present invention was devised to provide a television tuner circuit which was able to be constructed in a compact form and which would be capable of dealing with the full range of television bands as they are defined at the present time.
Acccording to the invention, there is provided a radio receiver tuner circuit comprising a tunable oscillator an output of which is applied through a preamplifier to two or more dividers connected in parallel, each divider output being connected to a mixer which has a further input for receiving an incoming radio frequency signal, and each mixer output providing an intermediate frequency signal on an output line of said tuner.
The two or more dividers may include dividers having different division ratios. In one embodiment, division ratios of 1, 2, 4 and 6 have been proposed. In an alternative embodiment, division ratios of 1, 2, 4 and 8 might be used.
The invention also comprises a radio or television receiver including the tuner circuit as already defined.
By way of example, a particular embodiment of the invention will now be described with reference to the accompanying drawing, the single figure of which is a circuit diagram of the tuner circuit.
As depicted in the drawing, an oscillator 1 which is capable of generating frequencies in the range of 400 to 940 megahertz is connected through a preamplifier 2 to a bank of dividers 3, 4, 6 connected in parallel with a buffer 7.
The buffer 7 and each of the dividers 3, 4 and 6 is connected to a respective mixer 8. Each mixer 8 is provided with second input leads 9 to which an incoming radio frequency signal can be applied.
The mixers 8 provide outputs which are connected in parallel so that these are combined at the two tuner output lines 11.
The buffer 7 and its respective mixer 8 can be switched on when required by the application of a suitable voltage on a Select Input Line S1. Similarly, the divider 3 and its mixer 8 can be actuated by a Select Line S2, the divider 4 and its mixer 8 by a Select Lines S5, S3 and the divider 6 and its mixer 8 by a select line S4.
The buffer 7 exhibits a divide ratio of unity. The dividers 3 and 4 have divide ratios of two and it will be seen that the input of divider 4 is received direct from divider 3 so that this, when selected, is able to provide a divide by four ratio. The divider 6 has a divide ratio of six.
In operation, the circuit arrangement can allow the full range of local oscillator frequencies to be produced for covering the current television frequency bands. By providing appropriate signals on the Select Input Lines S1 to S5 the switching of the different bands can be effected.The switching selection can be effected as in the following table:
Me gah ertz Band Covered Divide Ratio Frequency Generated Select Line UHF 1 400-940 S1 UHF 1 400-940 S1 Hyperband 2 200-470 S2, S5 (CATV) VHF Midband 4 100-235 S3, S5 (CATV) + VHF III VHF I 6 1 67-156 S4 Thus the full range of television bands can be covered by the tuner by making the appropriate selections on the Select Input Lines.
In a particular construction, the preamplifier 2 was arranged to limit the oscillator 1 output to a 500 millivolt swing and the buffer 7 acted to reduce this to 300 millivolts.
The tuner circuit of the invention was found to be capable of being constructed in a very compact form and it was suitable for being made as an integrated circuit.
The foregoing description of an embodiment of the invention has been given by way of example only and a number of modifications may be made without departing from the scope of the invention as defined in the appended claims. For instance, it is not essential that the divider ratios should be restricted to 1, 2, 4, 6, in different embodiments this could be 1, 2, 4, 8 or further suitable ratios.

Claims (6)

CLAIMS:
1. A radio receiver tuner circuit comprising a tunable oscillator an output of which is applied through a preamplifier to two or more dividers connected in parallel, each divider output being connected in parallel, each divider output being connected to a mixer which has a further input for receiving an incoming radio frequency signals, and each mixer output providing an intermediate frequency signal on an output line of said tuner.
2. A tuner circuit as claimed in Claim 1, in which the said dividers have different division ratios.
3. A tuner circuit as claimed in Claim 1 or 2, in which the said dividers have division ratios of 1, 2, 4 and 6.
4. A tuner circuit as claimed in Claim 1 or 2, in which the said dividers have division ratios of 1, 2, 4 and 8.
5. A radio receiver tuner circuit substantially as hereinbefore described with reference to the accompanying drawing.
6. A radio or television receiver including a tuner circuit as claimed in any one of Claims 1 to 5.
GB8807604A 1988-03-30 1988-03-30 Radio receiver tuner circuit Expired - Lifetime GB2216354B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8807604A GB2216354B (en) 1988-03-30 1988-03-30 Radio receiver tuner circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8807604A GB2216354B (en) 1988-03-30 1988-03-30 Radio receiver tuner circuit

Publications (3)

Publication Number Publication Date
GB8807604D0 GB8807604D0 (en) 1988-05-05
GB2216354A true GB2216354A (en) 1989-10-04
GB2216354B GB2216354B (en) 1992-09-16

Family

ID=10634374

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8807604A Expired - Lifetime GB2216354B (en) 1988-03-30 1988-03-30 Radio receiver tuner circuit

Country Status (1)

Country Link
GB (1) GB2216354B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685589A1 (en) * 1991-12-19 1993-06-25 Sagem Multi-band radiotelephony receiver

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1420271A (en) * 1972-07-27 1976-01-07 Dapplication Des Tech Nouvelle Electronic frequency changing apparatus
GB2155717A (en) * 1984-02-22 1985-09-25 Adret Electronique Quaternary frequency synthesiser

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1420271A (en) * 1972-07-27 1976-01-07 Dapplication Des Tech Nouvelle Electronic frequency changing apparatus
GB2155717A (en) * 1984-02-22 1985-09-25 Adret Electronique Quaternary frequency synthesiser

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2685589A1 (en) * 1991-12-19 1993-06-25 Sagem Multi-band radiotelephony receiver

Also Published As

Publication number Publication date
GB2216354B (en) 1992-09-16
GB8807604D0 (en) 1988-05-05

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PE20 Patent expired after termination of 20 years

Expiry date: 20080329