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High frequency receiving device, integrated circuit used for same, and TV receiver using them

一种接收装置、高频的技术，应用在用单独的预调谐电路进行不连续调谐、电视、仅具有可变电感/电容的单谐振电路等方向，能够解决不能振荡等问题

Inactive Publication Date: 2005-02-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the frequency divider 16 divides the local oscillation output signal shown in the curve 33 as it is, the frequency-divided signal supplied to the mixer 15, that is, the local oscillation signal becomes as shown in the curve 34. characteristic, within the variable range of the tuning voltage, for the originally necessary frequency range, a frequency range that cannot oscillate

Method used

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  • High frequency receiving device, integrated circuit used for same, and TV receiver using them
  • High frequency receiving device, integrated circuit used for same, and TV receiver using them
  • High frequency receiving device, integrated circuit used for same, and TV receiver using them

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no. 1 approach

[0035] Hereinafter, a first embodiment of the present invention will be described using the drawings. figure 1 It is a block diagram of the high-frequency receiving device of the first embodiment.

[0036] exist figure 1 , a high-frequency signal from 55.25 MHz to 801.25 MHz is input to the input terminal 51 . This high-frequency signal is supplied to a monotuned filter 52 . The single-tuned filter 52 is a single-tuned filter including one variable-capacitance diode, and its tuning frequency can be changed by a tuning voltage supplied to a variable-frequency terminal 52a. The tuning frequency of the single tuned filter 52 is between the UHF broadcast band from 367.25 MHz to 801.25 MHz.

[0037]The output of the monotuned filter 52 is connected to a high frequency amplifier 53 which amplifies the signal of the UHF broadcast band. The output of the high-frequency amplifier 53 is connected to a multituned filter 54 . This multi-tuning filter 54 includes two variable capaci...

no. 2 approach

[0093]The second embodiment is characterized in that reception of the UHF broadcast band and reception of the VHF broadcast band are performed with only one mixer. Therefore, it contributes to miniaturization and price reduction. Hereinafter, a second embodiment will be described. In addition, the same code|symbol is attached|subjected to the same part as 1st Embodiment, and description is simplified.

[0094] Figure 5 It is a block diagram of the high-frequency receiving apparatus of the second embodiment. exist Figure 5 , the broadcast waves of the UHF broadcast band and the VHF broadcast band are input to the input terminal 132 . Moreover, on this input terminal 132, in order to pass the UHF broadcast frequency band, it is connected in parallel with the first serially connected body of the single-tuned filter 52, the high-frequency amplifier 53, and the multi-tuned filter 54, in order to pass the VHF broadcast frequency band. It is connected in parallel with the seco...

no. 3 approach

[0101] Hereinafter, a third embodiment of the present invention will be described using the drawings. Image 6 It is a block diagram of main parts of a television receiver using the high-frequency receiving device of the third embodiment. In addition, in the third embodiment, the same reference numerals are attached to the same constituent elements as those in the first embodiment to simplify the description.

[0102] exist Image 6 In this case, a single tuned filter 52 is connected to the input terminal 51 and includes a variable capacitance diode. The tuning frequency of the single-tuning filter 52 is within the UHF broadcast band from 367.25 MHz to 801.25 MHz, and the tuning frequency can be changed by the tuning voltage supplied to the variable frequency terminal 52a.

[0103] A multituned filter 54 is connected to the output of the high frequency amplifier 53 . This multi-tuning filter 54 includes two variable capacitance diodes, and its tuning frequency can be change...

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Abstract

High frequency receiving device. An oscillation frequency changing means is inserted between a tuner and an oscillator of local oscillator (56) of a high frequency receiving device, and the oscillation frequency changing means, in each frequency band received, changes the oscillation frequency characteristic of local oscillator (56) in relation to the tuning voltage supplied from PLL circuit (78), and operates in accordance with the frequency characteristic of tuning filter (52, 54, 62, 64) to obtain an oscillation signal varied just by a predetermined frequency, thereby making it possible to receive broadband channels of continuous VHF broadcast band and UHF broadcast band.

Description

technical field [0001] Field of the Invention The present invention relates to a high-frequency receiving device used in a television receiving tuner and the like and an integrated circuit used therefor. Background technique [0002] Hereinafter, a conventional high-frequency receiving device will be described with reference to the drawings. Figure 8 It is a block diagram of a conventional high-frequency receiving device. [0003] exist Figure 8 , input a high-frequency signal from 55.25MHz to 801.25MHz on input terminal 1. Such a high-frequency signal is supplied to a monotuned filter 2 which is a monotuned filter. The single tuning filter 2 includes a variable capacitance diode, and its tuning frequency can be changed by a tuning voltage supplied to the frequency variable terminal 2a. The tuning frequency of the single-tuned filter 2 is between the UHF broadcast band (from 367.25 MHz to 801.25 MHz). [0004] The output of the single-tuned filter 2 is connected to a hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03J3/20H03J3/28H03J5/00H03J5/24H04B1/06H04B1/16H04B1/18H04B1/40H04B7/00H04N5/44
CPCH03J2200/36H03J5/244H03J3/28
Inventor 浅山早苗中辻幸治寺尾笃人田畑吉英高见秀司铃木正教鹿岛浩亲
Owner PANASONIC CORP
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