US 2003/0190900 A1Published application

Wide band tuner

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsMasashi Yasuda, Akira Fujishima

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Abstract

When changeover switch (26) selects the output of L band filter (23), changeover switch (28) is turned off and mixer (29) is operated as an amplifier such that the oscillation frequency of local oscillator (31) is controlled based on data fed to data terminal (37) and a channel selection can be performed in mixer (32). When changeover switch (26) selects the output of V band filter (25), changeover switch (28) is turned on and a channel selection is performed based on data fed to data terminal (37) in mixer (29). With this arrangement, the need for a tuning filter is eliminated and a broadband tuner not requiring manpower for adjustments can be provided.

Drawings

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Drawings

Claims9

Dependent claims

A broadband tuner comprising:

an input terminal supplied with a high-frequency digital signal;
a first fixed filter, allowing L band frequency to pass through, connected to said input terminal;
a second fixed filter, allowing V band frequency to pass through, connected to said input terminal;
a first changeover switch having an output of said first fixed filter connected to one terminal thereof and an output of said second fixed filter connected to the other terminal thereof;
a first mixer having a common terminal of said first changeover switch applied to one input thereof and an output of a first local oscillator connected to the other input thereof via a second changeover switch;
a third fixed filter, allowing L band frequency to pass through, connected to an output of said first mixer;
a second mixer having an output of said third fixed filter applied to one input thereof and an output of a second local oscillator connected to the other input thereof;
an output terminal having an output of said second mixer applied thereto;
a first PLL circuit loop-connected to said first local oscillator;
a first data terminal for supplying said first PLL circuit with data;
a second PLL circuit loop-connected to said second local oscillator;
and
a second data terminal for supplying said second PLL circuit with data, wherein,
when said first changeover switch selects the output of said first fixed filter, said second changeover switch is turned off such that said first mixer is operated as an amplifier and an oscillation frequency of said second local oscillator is controlled based on data supplied to said second data terminal, whereby a signal output from said third fixed filter is channel-selected and converted into a predetermined frequency in said second mixer, and
when said first changeover switch selects the output of said second fixed filter, said second changeover switch is turned on and an oscillation frequency of said first local oscillator is controlled based on data supplied to said first data terminal, whereby a channel selection is performed while the V band frequency is converted into L band in said first mixer, and an output of said third fixed filter is converted into a predetermined frequency in said second mixer.

12 more elements

A broadband tuner comprising:

an input terminal supplied with a high-frequency digital signal;
a first fixed filter, allowing L band frequency to pass through, connected to said input terminal;
a second fixed filter, allowing V band frequency to pass through, connected to said input terminal;
a first changeover switch having an output of said first fixed filter connected to one terminal thereof and an output of said second fixed filter connected to the other terminal thereof;
a first mixer having a common terminal of said first changeover switch applied to one input thereof and an output of a first local oscillator connected to the other terminal thereof via a second changeover switch;
a third fixed filter, allowing L band frequency to pass through, connected to an output of said first mixer;
a second mixer having an output of said third fixed filter applied to one input thereof and an output of a second local oscillator connected to the other input thereof via a first 90-degree phaser;
a third mixer having the output of said third fixed filter applied to one input thereof and the output of said second local oscillator connected to the other input thereof;
a second 90-degree phaser connected between an output of said second mixer and an output of said third mixer;
a fourth fixed filter connected to an output of said third mixer;
an output terminal supplied with an output of said fourth fixed filter,
a first PLL circuit loop-connected to said first local oscillator;
a first data terminal supplying said first PLL circuit with data;
a second PLL circuit loop-connected to said second local oscillator;
and
a second data terminal supplying said second PLL circuit with data, wherein,
when said first changeover switch selects an output of said first fixed filter, said second changeover switch is turned off such that said first mixer is operated as an amplifier and an oscillation frequency of said second local oscillator is controlled based on data input to said second data terminal, whereby a desired channel is selected and converted into a predetermined frequency in said second mixer and said third mixer, and
when said first changeover switch selects an output of said second fixed filter, said second changeover switch is turned on and an oscillation frequency of said local oscillator is controlled based on data supplied to said first data terminal, whereby a channel selection is performed while the V band frequency is converted into L band in said first mixer, and an output from said third fixed filter is converted into a predetermined frequency in said second mixer and said third mixer.

15 more elements

A broadband tuner comprising:

an input terminal supplied with a high-frequency digital signal;
a first fixed filter, allowing L band frequency to pass through, coupled to said input terminal;
a second fixed filter, allowing V band frequency to pass through, coupled to said input terminal;
a first changeover switch having an output of said first fixed filter connected to one terminal thereof and an output of said second fixed filter connected to the other terminal thereof;
a first mixer having a common terminal of said first changeover switch applied to one input thereof and an output of first local oscillator coupled to the other input thereof via a second changeover switch;
a third fixed filter supplied with an output of said first mixer and allowing L band frequency to pass through;
a second mixer having an output of said third fixed filter applied to one input thereof and an output of a second local oscillator coupled to the other input thereof via a first 90-degree phaser;
a fourth fixed filter coupled with an output of said second mixer;
a first output terminal supplied with an output of said fourth fixed filter;
a third mixer having the output of said third fixed filter applied to one input thereof and the output of said second local oscillator coupled to the other input thereof;
a series connection of a second 90-degree phaser and a third changeover switch connected between an output of said second mixer and an output of said third mixer;
a fifth fixed filter coupled to the output of said third mixer;
a second output terminal coupled with an output of said fifth fixed filter;
a first PLL circuit loop-connected to said first local oscillator;
a first data terminal supplying said first PLL circuit with data;
a second PLL circuit loop-connected to said second local oscillator;
and
a second data terminal supplying said second PLL circuit with data, wherein
said broadband tuner has a first operation mode in which said third changeover switch is turned off and a second operation mode in which said third changeover switch is turned on, and wherein,
when said first changeover switch selects an output of said first fixed filter, said second changeover switch is turned off such that said first mixer is operated as an amplifier and the oscillation frequency of said second local oscillator is controlled based on data input to said second data terminal, whereby a signal output from said third fixed filter is channel-selected and converted into a predetermined frequency in said second mixer and third mixer, and,
when said first changeover switch selects an output of said second fixed filter, said second changeover switch is turned on and oscillation frequency of said first local oscillator is controlled based on data input to said first data terminal, whereby a channel selection is performed while the V band signal is converted into L band, and the same is converted into a predetermined frequency in said second mixer and said third mixer.

18 more elements

Dependencies are inferred from the claim text.

Description4,387 words

Summary1,147 words

#The present invention relates to a broadband tuner for receiving signals having two different frequency bands.

#A conventional tuner will be described below.

#In the conventional tuner as shown in FIG. 4, input terminal 1 receiving a high-frequency digital signal is connected to high-frequency amplifier 2 for L band, the output of this high-frequency amplifier 2 is fed into bandpass filter 3 allowing L band frequency to pass through, and the output of this bandpass filter 3 and the output of local oscillator 4 oscillating a fixed frequency are fed into mixer 5.

Brief description of the drawings4 figures

#FIG. 1 is a block diagram of a broadband tuner in a first preferred embodiment of the present invention.

#FIG. 2 is a block diagram of a broadband tuner in a second preferred embodiment of the present invention.

#FIG. 3 is a block diagram of a broadband tuner in a third preferred embodiment of the present invention.

Detailed description3,172 words

#Preferred embodiments of a broadband tuner according to the present invention will be described below with reference to the accompanying drawings.

#(Preferred Embodiment 1)

#FIG. 1 is a block diagram of a broadband tuner of the preferred embodiment 1.

Facts

Application: 10/297,297Filed 7 Apr 2003
Published: 9 Oct 2003
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04B 1/005
Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised…
H04B 1/0096
Adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges: where a full band is frequency…
H04B 1/18
Circuits: input circuits, e.g. for coupling to an antenna or a transmission line
H04B 1/28
For superheterodyne receivers: the receiver comprising at least one semiconductor device having three or more electrodes

Family

US 7,013,124 B2Related patent
US 2003/0190900 A1This patent

From the US filing history. Foreign family members aren’t listed.

Timeline

7 Apr 2003Application filedUS 10/297,297
7 Apr 2003Assigned to Matsushita Electric Industrial Co., Ltd.assignment of assignor's interest
9 Oct 2003Published

Citations

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