CN1798287A - Tuner of TV system and turning method - Google Patents
Tuner of TV system and turning method Download PDFInfo
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- CN1798287A CN1798287A CN 200410101450 CN200410101450A CN1798287A CN 1798287 A CN1798287 A CN 1798287A CN 200410101450 CN200410101450 CN 200410101450 CN 200410101450 A CN200410101450 A CN 200410101450A CN 1798287 A CN1798287 A CN 1798287A
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Abstract
The system consists of a low noise amplifier used to receive and amplify the TV signals, a quadrature mixer used to combine the received the amplified TV signals and generate first media frequency quadrature signal, a complex mixer used to combine the received first media frequency quadrature signal and generate a second media frequency complex mixer, a multiphase filter used to combine the second media frequency quadrature signal and generate real part of the second media quadrature signal, a channel selection filter used to combine the real part of the second media frequency quadrature signal and select the signal from the preset channels, and a media frequency variable gain amplifier used to select the signal from the preset channels.
Description
Technical field
The present invention relates to a kind of tuner of television system, particularly a kind of TV tuner and tuning methods thereof with fully integrated circuit framework.
Background technology
In television system, tuner normally is used for signal is taken out signal from predetermined channel, and this predetermined channel is the frequency range from the 6MHZ in the wide television spectrum of about 54 ~ 860MHZ (electric television system is arranged) or 54 ~ 806MHZ (American Broadcasting System) scope.Tuner also usually with the conversion of signals of being taken out to a medium standard frequency (IF) so that device in television system subsequently can be in medium standard frequency processing signals.In the U.S., generally the medium standard frequency of using is 45.75MHZ.
Traditional tuner is changed the mode that the signal in the predetermined channel is to use a mixer to make smear by the oscillator signal and the signal of a part to intermediate frequency usually.Mixer is made smear with input signal and local oscillator signal, will produce two output signals, and one be input signal and the frequency sum total (and frequently) of local oscillator signal, and one be the frequency distance (difference frequency) of the oscillator signal of input signal and part.In principle, select the signal of difference frequency and filtering out and signal frequently.Therefore, if the frequency of local oscillator signal and the frequency distance of predetermined channel equal the medium standard frequency amount, then mixer is made smear with the oscillator signal and the predetermined channel of part, makes conversion of signals in the predetermined channel to medium standard frequency.For instance, if predetermined channel is transmitted among the 100MHZ, and local oscillator signal has 145.75MHZ or 55.25MHZ frequency.Local oscillation signal frequency is higher than predetermined channel or local oscillation signal frequency is lower than predetermined channel yet mixer can't be distinguished.In other words, when the signal of conversion predetermined channel arrives medium standard frequency, first signal frequency that is higher than the medium standard frequency amount with the oscillation signal frequency gap of part will be transformed into intermediate frequency, and also can be transformed into intermediate frequency with second signal frequency that the oscillation signal frequency gap of part is lower than the medium standard frequency amount.For instance, have the frequency of 145.75MHZ if predetermined channel is 100MHZ and local oscillator signal, then the signal of a 191.5MHZ also will be transformed into 45.75MHZ and disturb signal in the predetermined channel.Such interference signal is commonly called image signal and must suppresses.
Traditional tuner is generally two kinds of aspects and one of is called in single conversion tuner and the two conversion tuners.Single conversion tuner uses tracking filter to suppress image signal, and two conversion tuner conversion TV signal then uses the filter of a preset parameter to suppress image signal to first intermediate frequency.Details are as follows for the example of each aspect.
Figure 1A to Fig. 1 I is the appearance of traditional single conversion tuner 100, and wherein Figure 1A is the framework of tuner 100, and Figure 1B to Fig. 1 E is first example, when selecting low channel, and the TV signal frequency spectrum of the different sections of tuner 100.Fig. 1 F to Fig. 1 I is second example, when selecting the high frequency road, and the TV signal frequency spectrum of the different sections of tuner 100.
Figure 1B shows by low noise amplifier (LNA) 102 receptions and the frequency spectrum of the TV signal after amplifying.In first example, select the low channel in the TV signal frequency spectrum, it has an intermediate frequency f near frequency spectrum than low side
C1Shown in Figure 1B, the frequency f of local oscillation signal
LOBe higher than f
C1Equaling medium standard frequency amount (or 45.75MHZ) is shown among Figure 1B with medium standard frequency (IF).Image signal frequency band (or image signal) also is shown among Figure 1B, is higher than f
LOAnd a gap that equals the intermediate frequency amount is arranged.Shown in Figure 1B, the image signal frequency band has an intermediate frequency f
I1And f
I1-f
LO=f
LO-f
C1=IF.Figure 1B also shows the filter response of tracking filter 104, with H
TCurve indicates.The image signal frequency band falls within outside the passband of tracking filter 104.Therefore, the image signal frequency band is subjected to suppress by the TV signal of tracking filter 104.
Fig. 1 C shows the frequency spectrum that is subjected to the TV signal after tracking filter 104 filters.Shown in Fig. 1 C, the frequency spectrum in tracking filter 104 passbands for what keep, is downtrod and partly comprise the image signal frequency band outside tracking filter 104 passbands haply partly.
After tracking filter 104 filtered, TV signal was made smear via the local oscillation signal that mixer 108 and local oscillator 105 provide.As a result, shown in Fig. 1 D, TV signal is converted to different frequency between local oscillation signal and TV signal.Also all the other of the signal in display device image signal and the predetermined channel are partly for being transformed into medium standard frequency for Fig. 1 D, and the part of frequency spectrum is with i
1All the other of the image signal that representative is relevant partly.Fig. 1 D more shows the filter response of CFS110, with H
CSFCurve indicates.The passband of CFS110 has the frequency range of general 6MHZ and intermediate point, and the chances are at 45.75MHZ.Shown in Fig. 1 E, behind the signal channel channel select filter (CSF) 110, select the signal in the predetermined channel, and the residue of image signal is downtrod haply partly.
In second example, the high channel in the selective reception TV signal low frequency spectrum.The filter response of tracking filter 104 correspondingly adapts to so that predetermined high channel falls within the passband of tracking filter 104, and the image signal of predetermined high channel is resisted and falls within outside the passband.Fig. 1 F shows the frequency spectrum of the TV signal after being subjected to low noise amplifier (LNA) 102 receptions and amplifying.In amplifying signal, a high channel, it has intermediate frequency f
C2Be positioned at wherein and near the higher-end of television spectrum.f
LOFor being higher than f
C2One medium standard frequency amount (or 45.75MHZ).Image signal frequency band (or mirror image) has an intermediate frequency f
I2Be higher than f
LO45.75MHZ.The filter response of tracking filter 104 is denoted as curve H
T, also be shown among Fig. 1 F.The image signal frequency band falls within outside the passband of tracking filter 104, and predetermined channel falls within the passband.Fig. 1 G to Fig. 1 I is respectively the frequency spectrum of signal by tracking filter 104, mixer 108 and channel select filter (CSF) 110.These frequency spectrums can this operator be understood so do not explain in detail in this by haveing the knack of.
As mentioned above, when selecting different channels (low channel in the above-mentioned example and high channel), the filter response of tracking filter 104 needs correspondingly to adapt to.Tracking filter 104 itself normally provides electric power with the 30V voltage source and is difficult for integrating.
Be to solve problem, will provide two conversions tuning being used on the television system, see through with reference to " Fig. 2 A " at the disclosed example of United States Patent (USP) NO.6117964 Birleson et al. and be described as follows to Fig. 2 E about tracking filter.
Fig. 2 A is the framework according to the two conversion tuners 200 of Birleson et al..Tuner 200 comprises the low noise amplifier (LNA) 202 and the TV signal that will amplify of reception and amplified television signal and has f
LO1First local oscillation signal of frequency is made first mixer 204 of smear, with the band pass filter (BPF) 206 that filters mixer 204 output signals, with BPF206 output with have f
LO2Second vibration (OL) signal of frequency is made second mixer 208 of smear, and the channel select filter (CSF) 210 of selecting predetermined channel.Shown in Fig. 2 B, the frequency spectrum of the TV signal that is received, it comprises predetermined channel, has an intermediate frequency f
cf
LO1Be higher than f
cOne first medium-frequency IF, 1 amount.Select then f of IF1
LO1Fall within outside the TV signal frequency spectrum, and may be further from frequency spectrum.So in the predetermined channel with f f
LO1The relevant first relevant image signal f
I1Also can be away from frequency spectrum, and suppressed before low noise amplifier (LNA) 202 by filter (do not have and show).After Fig. 2 B demonstration is subjected to the inhibition of filter before low noise amplifier (LNA) 202, the first image signal f
I1Residue partly.Fig. 2 C shows the output signal spectrum of first mixer 204, and the frequency spectrum that wherein is relevant to predetermined channel partly is positioned at frequency and equals the IF1 part and be relevant to the frequency spectrum part of first image signal residue part with i
1Expression.In Fig. 2 C, the filter response of BPF206 is with curve H
BPFRepresentative.Fig. 2 D shows the TV signal frequency spectrum that is subjected to after BPF206 filters.The second local oscillation signal frequency f
LO2Be lower than IF1 one medium standard frequency amount, represent with IF2.Shown in Fig. 2 D, with f
LO2The relevant second relevant image signal is positioned at frequency f
I2=f
LO2-IF2.In addition, after second mixer 208 and the channel select filter (CSF) 210, filter out the signal of predetermined channel, shown in Fig. 2 E, wherein with i
1+ i
2The frequency spectrum part of expression, it is the residue part that is relevant to first image signal and second image signal.
Summary of the invention
In view of above problem, the object of the present invention is to provide a kind of TV tuner system and tuning methods thereof, to overcome problems of the prior art.
To achieve these goals, the invention provides a kind of TV tuner system, comprise one as the low noise amplifier that receives with amplified television signal, one with combine receive the TV signal of amplifying and produce the quadrature mixer of the first intermediate frequency quadrature signal, one with combine the first intermediate frequency quadrature signal that is received and produce the multiple frequency mixer of the second intermediate frequency quadrature signal, one with combine second intermediate frequency quadrature signal that is received and the polyphase filters that produces the solid part signal of the second intermediate frequency quadrature signal, one with the solid part signal that combines this second intermediate frequency quadrature signal and select the channel select filter of signal in predetermined channel, and one and amplify intermediate frequency variable gain amplifier by the signal in the selected predetermined channel of channel select filter.
Another object of the present invention is for providing a kind of single-chip tuner that is used for television system, it comprises a quadrature mixer, connect a low noise amplifier with received television signal and connect one first local oscillator to receive the first quadrature local oscillator signal, wherein the quadrature mixer is by with the first quadrature local oscillator signal and TV signal smear and produce the first intermediate frequency quadrature signal, one produces the second intermediate frequency quadrature signal in conjunction with a biorthogonal mixer to receive this first intermediate frequency quadrature signal, and one produce the second intermediate frequency solid part signal in conjunction with a polyphase filters to receive this second intermediate frequency quadrature signal.
Another object of the present invention is for providing a TV tuner system, and it comprises the low noise amplifier and the integrated circuit that receive with amplified television signal and is provided on the substrate.Integrated circuit comprise a quadrature mixer connect this low noise amplifier with the TV signal of receive amplifying with produce the first intermediate frequency quadrature signal, with a multiple mixer frequently to receive this first intermediate frequency quadrature signal with the generation second intermediate frequency quadrature signal and combine a polyphase filters to receive the second intermediate frequency quadrature signal and the generation second intermediate frequency solid part signal.This system more comprises in conjunction with a channel select filter receiving this second intermediate frequency solid part signal and the signal of selecting in the predetermined channel, and an intermediate frequency variable gain amplifier is to amplify the signal in the predetermined channel of being selected by channel select filter.
Another object of the present invention is for providing a TV tuner system, and it comprises the low noise amplifier that receives with amplified television signal, with combine a quadrature mixer with the TV signal of receive amplifying with produce the first intermediate frequency quadrature signal, with combine a multiple mixer frequently to receive this first intermediate frequency quadrature signal and to produce the second intermediate frequency quadrature signal, with combine a multiple filter frequently to receive the second intermediate frequency quadrature signal and to select the signal in the predetermined channel and produce the second intermediate frequency solid part signal of selected channel, and one intermediate frequency variable gain amplifier to amplify the second intermediate frequency solid part signal that this selects channel.
Another object of the present invention is for providing a kind of single-chip tuner that is used for television system, it comprises a quadrature mixer and connects a low noise amplifier with received television signal and connect one first local oscillator to receive the first quadrature local oscillation signal, wherein the quadrature mixer is by with the first quadrature local oscillation signal and TV signal smear and produce the first intermediate frequency quadrature signal, and produce the second intermediate frequency quadrature signal to receive this first intermediate frequency quadrature signal, and select signal in the predetermined channel to receive this second intermediate frequency quadrature signal in conjunction with a multiple filter frequently in conjunction with a biorthogonal mixer.
Another object of the present invention is for providing a TV tuner system, its comprise receive with the low noise amplifier of amplified television signal, with one first local oscillator the first quadrature local oscillation signal to be provided, to be provided on the substrate so that the second quadrature local oscillation signal and an integrated circuit to be provided with one second local oscillator.This integrated circuit comprises a quadrature mixer and connects this low noise amplifier to receive the TV signal of amplifying and to connect this first local oscillator to receive first orthogonal signalling, wherein the quadrature mixer is with the first quadrature local oscillation signal and TV signal smear and produce the first intermediate frequency quadrature signal, and combine this quadrature mixer to receive this first intermediate frequency quadrature signal and to link this second local oscillator to receive the second quadrature local oscillation signal with a biorthogonal mixer, wherein this multiple mixer frequently produces the second intermediate frequency quadrature signal with the first intermediate frequency quadrature signal with the second quadrature local oscillation signal smear, and in conjunction with a multiple filter frequently to receive the signal in two intermediate frequency quadrature signals and the selection predetermined channel.This system more comprises an intermediate frequency variable gain amplifier to amplify the signal in the predetermined channel of being selected by multiple filter frequently.
The present invention more provides a kind of TV tuner system, and it comprises the low noise amplifier that receives with amplified television signal, with one first local oscillator so that the first quadrature local oscillation signal to be provided, with one second local oscillator so that the second quadrature local oscillation signal to be provided, with combine a quadrature mixer with the TV signal that receives this amplification and the first quadrature local oscillation signal and produce the first intermediate frequency quadrature signal, with combine a multiple mixer frequently to receive this first intermediate frequency quadrature signal and the second quadrature local oscillation signal and to produce the second intermediate frequency quadrature signal, and in conjunction with a variable gain again frequently filter to receive this second intermediate frequency quadrature signal, this selection signal of really good signal and amplification in the selection predetermined channel.
The present invention more provides a kind of single-chip tuner that is used for television system, it comprises a quadrature mixer and connects a low noise amplifier with received television signal and connect one first local oscillator to receive the first quadrature local oscillator signal, wherein the quadrature mixer is by with the first quadrature local oscillator signal and TV signal smear and produce the first intermediate frequency quadrature signal, and in conjunction with a biorthogonal mixer to receive this first intermediate frequency quadrature signal and to be connected one second local oscillator to receive the second quadrature local oscillation signal, wherein the biorthogonal mixer produces the second intermediate frequency quadrature signal with first medium-frequency IF, 1 orthogonal signalling and the second quadrature local oscillation signal smear, and in conjunction with a variable gain again frequently filter to receive this second intermediate frequency quadrature signal, select this selection signal of signal and amplification in the predetermined channel.
Another object of the present invention is for providing a TV tuner system, its comprise receive with the low noise amplifier of amplified television signal, with one first local oscillator so that the first quadrature local oscillation signal to be provided, its comprise an in-phase signal and orthogonal signalling, with one second local oscillator so that the second quadrature local oscillation signal to be provided, it comprises an in-phase signal and orthogonal signalling and an integrated circuit and is provided on the substrate.This integrated circuit comprises a quadrature mixer and connects this low noise amplifier to receive the TV signal of amplifying and to connect this first local oscillator to receive first orthogonal signalling, wherein the quadrature mixer is with the in-phase signal of first orthogonal signalling and orthogonal signalling and TV signal smear and produce the first intermediate frequency quadrature signal, and one the biorthogonal mixer in conjunction with this quadrature mixer to receive this first intermediate frequency quadrature signal and to link this second local oscillator to receive the second quadrature local oscillation signal, wherein this multiple mixer frequently produces the second intermediate frequency quadrature signal with the in-phase signal of the first intermediate frequency quadrature signal and the second quadrature local oscillation signal and orthogonal signalling smear, and in conjunction with a variable gain again the frequency filter to receive the second intermediate frequency quadrature signal, select this selection signal of signal and amplification in the predetermined channel.
The present invention more provides a kind of TV tuner system, it comprises the low noise amplifier that receives with amplified television signal, with a local oscillator so that the quadrature local oscillation signal to be provided, combine the TV signal and generation quadrature radio-frequency signals of this low noise amplifier to receive this amplification with a quadrature generator, combine with a multiple mixer frequently this low noise amplifier with receive this radio frequency orthogonal signal and in conjunction with this local oscillator to receive this quadrature local oscillation signal, wherein multiple mixer frequently with quadrature local oscillation signal and quadrature radio-frequency signals smear with generation quadrature intermediate-freuqncy signal, and in conjunction with a variable gain again frequently filter to receive this intermediate frequency quadrature signal, select this selection signal of signal and amplification in the predetermined channel.
Another object of the present invention is for providing a kind of single-chip tuner that is used for television system, it comprises a quadrature generator and connects a low noise amplifier with received television signal and generation quadrature radio-frequency signals, with in conjunction with a biorthogonal mixer to receive this quadrature radio-frequency signals and to be connected a local oscillator to receive quadrature local oscillator signal, wherein the biorthogonal mixer produces the quadrature intermediate-freuqncy signal with quadrature local oscillation signal and quadrature radio-frequency signals smear, and in conjunction with a variable gain again frequently filter to receive this quadrature intermediate-freuqncy signal, select signal and amplification time selection signal in the predetermined channel.
Another object of the present invention is for providing a kind of tuning methods that is used for television system, and its step comprises: received television signal, amplify this TV signal, the first quadrature local oscillator signal is provided, with this amplified television signal therewith the first quadrature local oscillation signal smear to produce the first intermediate frequency quadrature signal, with this first intermediate frequency quadrature signal and the second quadrature local oscillation signal smear to produce the second intermediate frequency quadrature signal, utilize the second intermediate frequency quadrature signal to produce the second intermediate frequency solid part signal and to filter the second intermediate frequency solid part signal to select the signal in the predetermined channel by channel select filter.
Other characteristic of the present invention and advantage will be described in detail the part proposition and be illustrated from be described in detail or can practise it by carrying out the present invention by following.
Relevant characteristics and implementation of the present invention, conjunction with figs. is described in detail as follows as most preferred embodiment now.
Description of drawings
Figure 1A is the framework of the conventional tuner of prior art.
Figure 1B to Fig. 1 E be the really good TV signal of the tuner of Figure 1A in the frequency spectrum of different phase, it be first example at the selection low channel.
Fig. 1 F to Fig. 1 I be the TV signal of tuner of Figure 1A in the frequency spectrum of different phase, it is at second example of selecting high frequency.
Fig. 2 A is an a kind of pair of conversion tuner framework of prior art.
Fig. 2 B to Fig. 2 E is the frequency spectrum of the TV signal of the tuner among Fig. 2 A in different phase.
Fig. 3 A is first embodiment according to tuner of the present invention.
Fig. 3 B to Fig. 3 E is the frequency spectrum of the TV signal of the tuner among Fig. 3 A in different phase.
Fig. 4 A to Fig. 4 B is that the tuner of Fig. 3 A and the mirror image rejection rate (IMRR) between conventional tuner compare.
Fig. 5 is the framework according to second embodiment of tuner of the present invention.
Fig. 6 is the framework according to the 3rd embodiment of tuner of the present invention.
Fig. 7 is the framework according to the 4th embodiment of tuner of the present invention.
Fig. 8 is the framework according to the 5th embodiment of tuner of the present invention.
Wherein, Reference numeral:
100 single conversion tuners
102 low noise amplifiers (LNA)
104 tracking filters
106 local oscillators
108 mixers
110 channel select filters (CFS)
200 pairs of conversion tuners
202 low noise amplifiers (LNA)
204 first mixers
206 band pass filters (BPF)
208 second mixers
210 channel select filters (CFS)
300 tuners
The 301-A chip
The 301-B chip
The 301-C chip
The 301-D chip
302 low noise amplifiers (LNA)
303 quadrature generators
304 quadrature mixers
306 multiple mixer/biorthogonal mixers frequently
308 polyphase filters
309 multiple filters frequently
310 channel select filters (CSF)
311 variable gains are frequency filter (VGCF) again
312 first local oscillators
314 second local oscillators
316 F variable gain amplifiers (VGA)
f
cIntermediate frequency
f
C1Intermediate frequency
f
C2Intermediate frequency
f
HHigh frequency
f
I1The intermediate frequency of first image signal
f
I2The intermediate frequency of second image signal
f
LLow frequency
f
LOThe frequency of local oscillation signal
f
LO1The frequency of first local oscillation signal
f
LO2The frequency of second local oscillation signal
H
BPFThe Bandpass Filters response curve
H
CSFThe channel select filter response curve
H
TThe filter response of tracking filter
The I in-phase signal
i
1The frequency spectrum of the residue part of first image signal
i
2The frequency spectrum of the residue part of second image signal
The IF intermediate frequency
IF1 first intermediate frequency
IF2 second intermediate frequency
The Q orthogonal signalling
The RF radio frequency
Embodiment
Purpose according to the present invention is for providing a kind of new tuner framework that is suitable for integrating.Fig. 3 A to Fig. 3 E,
Fig. 4 A to Fig. 4 B and Fig. 5 to Fig. 8 are about embodiments of the invention.
Fig. 3 A is a kind of tuner 300 according to the first embodiment of the present invention.As shown in Figure 3A, tuner comprises low noise amplifier (LNA) 302, quadrature generator 304, multiple mixer 306, polyphase filters 308 and channel select filter (CSF) 310 frequently.The TV signal or radio frequency (RF) signal that take out in low noise amplifier (LNA) 302 receptions and the predetermined channel of amplification from the predetermined channel of selecting.This receives with amplifying signal has a spectral range from low frequency f
LTremendously high frequency f
H, shown in Fig. 3 B.Fig. 3 B also points out one of this predetermined channel intermediate frequency f
c
Quadrature generator 304 connects low noise amplifier (LNA) 302 to receive the TV signal of amplifying and to connect one first local oscillator 312 to produce first quadrature local oscillation (LO) signal, and it comprises homophase local oscillation signal and quadrature local oscillation signal.On the other hand, this first quadrature local oscillation signal has one and is higher than f
cThe frequency f of one first medium-frequency IF, 1 amount
LO1In addition, f
LO1Be higher than f
HTherefore, one of relevant with the first quadrature local oscillation signal first image signal frequency band about predetermined channel, or first image signal, also fall within outside the received television signal frequency spectrum and can not suppress before low noise amplifier (LNA) 302 by filter (have and show) haply.And Fig. 3 B is depicted as in having an intermediate frequency f before the low noise amplifier (LNA) 302 and after suppressed by filter
I1First image signal residue partly.Quadrature generator 304 comprises a quadrature mixer, it utilizes two in-phase signals in first local oscillation signal and orthogonal signalling and TV signal to make smear and produce mentioned first medium-frequency IF, 1 orthogonal signalling in the literary composition, and it also comprises in-phase signal and orthogonal signalling.Because of conversion of signals in predetermined channel arrives intermediate frequency, so claim that this signal is first medium-frequency IF 1.Shown in Fig. 3 C, be the frequency spectrum of first medium-frequency IF, 1 orthogonal signalling that produce.Shown in Fig. 3 C, predetermined channel has been transformed into first intermediate-freuqncy signal, first medium-frequency IF 1.In other words, the signal of the predetermined channel in the TV signal of reception has shifted intermediate frequency one first medium-frequency IF, 1 frequency band.Also be transformed into frequency first medium-frequency IF 1 and remain first image signal, because f
I1With f
LO1Gap be first medium-frequency IF 1, and about the residue of first image signal frequency spectrum partly in Fig. 3 C with i
1Expression.
For convenience of description, employed title in the explanation as the first intermediate frequency quadrature signal, the second intermediate frequency solid part signal etc., is the coherent signal of the relevant intermediate frequency of indicating predetermined channel.Therefore, the second intermediate frequency quadrature signal is that predetermined channel is in second intermediate frequency.
First medium-frequency IF, 1 orthogonal signalling are sent to multiple frequency mixer 306, and it connects one second local oscillator 314 to receive second quadrature local oscillation (LO) signal, and it comprises homophase local oscillation signal and quadrature local oscillation signal.In addition, the second quadrature local oscillation signal has f
LO2Frequency, it is the gap space of first medium-frequency IF 1, the predetermined channel that distance was changed via quadrature generator 304 then has second medium-frequency IF, 2 amounts, also is medium standard frequency, shown in Fig. 3 C.And in predetermined channel, be relevant to the relevant second image signal frequency band of the first quadrature local oscillation signal, or second image signal, also be shown among Fig. 3 C.The second image signal frequency band has an intermediate frequency f
I2 Multiple mixer 306 frequently can comprise a biorthogonal mixer, and it utilizes each homophase in the second quadrature local oscillation signal and each homophase in orthogonal signalling and first medium-frequency IF, 1 orthogonal signalling and orthogonal signalling to make smear and produce second medium-frequency IF, 2 orthogonal signalling.Second medium-frequency IF, 2 orthogonal signalling also comprise in-phase signal and orthogonal signalling.
And polyphase filters 308 is in conjunction with the in-phase signal in second medium-frequency IF, 2 orthogonal signalling and orthogonal signalling and offset second image signal and produce second medium-frequency IF, 2 solid part signals.Especially in the shown example of Fig. 3 A to Fig. 3 E, f
LO2Less than the predetermined channel IF1 that changed, so f
LO2Above frequency spectrum is partly for needing protection.Therefore, by in conjunction with homophase and orthogonal signalling in second medium-frequency IF, 2 orthogonal signalling, be lower than f among polyphase filters 308 payment Fig. 3 C
LO2Frequency spectrum partly, it comprises second image signal in the predetermined channel.Fig. 3 D shows the frequency spectrum of second medium-frequency IF, 2 solid part signals.Shown in Fig. 3 D, conversion predetermined channel to the second medium-frequency IF 2, and the i that indicates among Fig. 3 D
1+ i
2Frequency spectrum partly be partly about the residue in first image signal and second image signal.
At last, have with second medium-frequency IF 2 is the channel select filter (CSF) 310 of one of intermediate frequency passband, it is in order to filter out unnecessary signal and in the TV signal that is received, select the signal in the predetermined channel, and this signal is for being converted to frequency second medium-frequency IF 2 by multiple mixer 306 frequently with polyphase filters.Fig. 3 E is the frequency spectrum of the output signal of indicated channel selective filter (CSF) 310.
In tuner 300, play the part of a mirror image to scolding mixer (IRM) in conjunction with biorthogonal mixer 306 and polyphase filters 308.So only use the quadrature generator and do not have the tuner of biorthogonal mixer compared to tradition, IRM of the present invention scolds rate (IMRR) for providing preferable mirror image to support.Following Fig. 4 A and Fig. 4 B, table 1-table 2 are for showing the simulation result about tuner 300 runnings.
In Fig. 4 A and Fig. 4 B, abscissa is represented the inhomogeneous state of phase place between homophase and orthogonal signalling and ordinate is represented IMRR.In theory, homophase and orthogonal signalling have the phase deviation of 90 degree.The inhomogeneous state of phase place is defined as the skew of 90 degree phase differences therewith between homophase and orthogonal signalling.Fig. 4 A has shown IMRR and the inhomogeneous state relativeness of phase place of using the quadrature generator and not having the conventional tuner 300 of biorthogonal mixer.Fig. 4 B shows the IMRR of tuner 300 of the present invention.Shown in Fig. 4 A, when homophase and orthogonal signalling were mutually orthogonal definitely, traditional tuner provided the IMRR just over 60dB.And when the inhomogeneous state of phase place increased, conventional tuner and IMRR dropped to about 30dB, and then IMRR is lower than 30dB when the inhomogeneous state of phase place is spent near 4 or be above.The present invention and tuner 300 then at whole 1 to 4 the degree the inhomogeneous IMRR that provides more than the 60dB of phase place on a large scale, and when phase place inhomogeneous 3 the degree about then IMRR can arrive above 100dB.
Table 1
| Calculate | The inhomogeneous state uniform state of local oscillation phase place | Satisfy the demands | Do not satisfy the demands |
| 0 | 0.000 | 496.000 | 504.000 |
| 1 | -0.828 | ||
| 2 | 3.645 | ||
| 3 | 2.455 | ||
| 4 | -1.324 | ||
| 5 | -0.872 | ||
| 6 | -0.317 | ||
| 7 | 2.842 | ||
| 8 | 5.263 | ||
| 9 | 5.390 | ||
| 10 | -2.211 | ||
| 11 | 1.706 | ||
| 12 | -2.215 | ||
| 13 | 0.405 |
In this emulation, being calculated as of IMRR repeats each conventional tuner and tuner of the present invention 13 times.Result of calculation is shown in the table 1-table 2.The calculating of repetition is pointed out on first hurdle of each table 1 and table 2.In table 1, in-phase signal and the inhomogeneous state of the phase place between orthogonal signalling in second hurdle demonstration conventional tuner in the output signal of quadrature generator.Third column is to satisfy the device number that IMRR is not less than the 35dB demand in the table 1.The 4th hurdle is not for satisfying the device number of this demand in the table 1.In the table 2, in-phase signal and the inhomogeneous state of the phase place between orthogonal signalling in the output signal of second hurdle demonstration quadrature generator 304.Third column is in-phase signal and the inhomogeneous state of the phase place between orthogonal signalling in the second quadrature local oscillation signal in the table 2.The 4th hurdle is to satisfy the device number that IMRR is not less than the 60dB demand in the table 2.The 5th hurdle is not for satisfying the device number of this demand in the table 2.As shown in table 1, suppose minimum IMRR value 35dB, conventional tuner provides 49.6% simulation result.And as shown in table 2, even when supposing minimum IMRR value 60dB, the simulation result of tuner 300 of the present invention is 99.4%.
Table 2
| Calculate | The inhomogeneous state of signal phase | The inhomogeneous state of local oscillation phase place | Satisfy the demands | Do not satisfy the demands |
| 0 | 0.000 | 0.000 | 994 | 6.00 |
| 1 | 0.696 | -3.113 | ||
| 2 | 0.898 | 3.277 | ||
| 3 | 1.835 | 2.739 | ||
| 4 | 1.373 | -4.111 | ||
| 5 | -1.424 | -1.130 | ||
| 6 | 0.480 | 4.320 | ||
| 7 | -0.659 | -0.603 | ||
| 8 | 2.518 | -.967 | ||
| 9 | 0.004 | 1.670 | ||
| 10 | 1.452 | -2.913 | ||
| 11 | 0.740 | 0.325 | ||
| 12 | 3.455 | 1.201 | ||
| 13 | 3.020 | 6.606 |
Shown in Figure 6 as the third embodiment of the present invention, polyphase filters 308 can be substituted by multiple filter 309 frequently with channel select filter (CSF) 310, its can be integrated into chip 301-B and with quadrature generator 304 and biorthogonal mixer 306 together.The signal of multiple filter 309 frequently from biorthogonal mixer 306 reception second medium-frequency IF, 2 orthogonal signalling and selection predetermined channel, and produce second medium-frequency IF, 2 solid part signals of selecting channel signals.Fig. 6 has shown that also tuner 300 connects intermediate frequency variable gain amplifier (VGA) 316 to amplify second medium-frequency IF, 2 solid part signals of selecting channel.On the other hand, as shown in Figure 6, low noise amplifier (LNA) 302 also is integrated in chip 301-B with variable gain amplifier (VGA) 316.
Shown in Figure 7 as the fourth embodiment of the present invention, multiple frequency filter 309 among Fig. 6 and IF variable gain amplifier (VGA) 316 can be incorporated into a single-chip as variable gain filter (VGCF) 311 frequently again, and be integrated in chip 301-C, with quadrature generator 304 and biorthogonal mixer 306 together.VGCF311 receives second medium-frequency IF, 2 orthogonal signalling from biorthogonal mixer 306, selects the signal in the predetermined channel, and changes selected signal to standard I F, with the channel signals that amplifies this selection.In addition, as shown in Figure 7, low noise amplifier (LNA) 302 also can be integrated in 301-C.
Shown in Figure 8 as the fifth embodiment of the present invention, quadrature mixer 304 can be replaced by quadrature generator 303, its receive from the TV signal of low noise amplifier (LNA) 302 with produce quadrature RF signal.Quadrature RF signal is sent to biorthogonal mixer 306, and it makes smear and output orthogonal intermediate-freuqncy signal with the second quadrature local oscillation signal that is provided by second local oscillator 314 with quadrature RF signal.Quadrature generator 303 can be integrated in chip 301-D and with biorthogonal mixer 306 and VGCF311.In addition, as shown in Figure 8, low noise amplifier (LNA) 302 also can be integrated in chip 301-D.
Though the present invention discloses as above with aforementioned and preferred embodiment, so it is not in order to limit the present invention.Those of ordinary skills without departing from the spirit and scope of the present invention, therefore when changing accordingly and retouching, scope of patent protection of the present invention is as the criterion with the protection range that claims were defined.
Claims (57)
1, a kind of TV tuning system is characterized in that, includes:
One low noise amplifier is used for receiving and amplified television signal;
One quadrature mixer in conjunction with receiving this amplified television signal, and produces one first intermediate frequency quadrature signal;
One multiple mixer frequently is in conjunction with to receive this first intermediate frequency quadrature signal, with generation one second intermediate frequency quadrature signal;
One polyphase filters in conjunction with receiving this second intermediate frequency quadrature signal, and produces one second intermediate frequency quadrature solid part signal;
One channel select filter is in conjunction with receiving this second intermediate frequency quadrature solid part signal, with a signal of selecting in the predetermined channel; And
One intermediate frequency variable gain amplifier amplifies this signal in this predetermined channel of this channel select filter selection.
2, TV tuning system according to claim 1, it is characterized in that, more comprise one first local oscillator, so that one first quadrature local oscillation signal to be provided, wherein this quadrature mixer connects this first local oscillator receiving this first quadrature local oscillation signal, and makes smear to produce this first intermediate frequency quadrature signal by this first quadrature local oscillation signal and this amplified television signal.
3, TV tuning system according to claim 2 is characterized in that, the frequency in this first quadrature local oscillation signal is outside the frequency spectrum of this TV signal, and an intermediate frequency that is higher than in this predetermined channel equals this first intermediate frequency amount.
4, TV tuning system according to claim 3, it is characterized in that, more comprise one second local oscillator, so that one second quadrature local oscillation signal to be provided, wherein should connect this second local oscillator by multiple mixer frequently, to receive this second quadrature local oscillation signal, reach and make smear and produce this second intermediate frequency quadrature signal by this second quadrature local oscillation signal and this first intermediate frequency quadrature signal.
5, TV tuning system according to claim 4 is characterized in that, a frequency of this second quadrature local oscillation signal is lower than this first intermediate frequency and equals this second intermediate frequency amount.
6, TV tuning system according to claim 5 is characterized in that, this channel select filter has a passband, and the one intermediate frequency approximates this second intermediate frequency greatly.
7, TV tuning system according to claim 1, it is characterized in that, more comprise a local oscillator, one quadrature local oscillation signal is provided, wherein should connect this local oscillator to receive this quadrature local oscillation signal by multiple mixer frequently, and reach and make smear and produce this second intermediate frequency quadrature signal by this quadrature local oscillation signal and this first intermediate frequency.
8, TV tuning system according to claim 1 is characterized in that, this multiple mixer frequently comprises a biorthogonal mixer.
9, a kind of single-chip tuner that is used for television system is characterized in that, includes:
One quadrature mixer, connect a low noise amplifier with received television signal, with be connected one first local oscillator to receive this first local oscillation signal, wherein this quadrature mixer is by with this TV signal and this first quadrature local oscillation signal smear and produce this first intermediate frequency quadrature signal;
One biorthogonal mixer in conjunction with receiving this first intermediate frequency quadrature signal, and produces this second intermediate frequency quadrature signal; And
One polyphase filters in conjunction with receiving this second intermediate frequency quadrature signal, and produces one second intermediate frequency solid part signal.
10, the single-chip tuner of television system according to claim 9, it is characterized in that, frequency lies in outside the frequency spectrum of this TV signal one of in this first quadrature local oscillation signal, and an intermediate frequency that is higher than this predetermined channel equals this first intermediate frequency amount.
11, the single-chip tuner of television system according to claim 10, it is characterized in that, this biorthogonal mixer, connect one second local oscillator to receive this second quadrature local oscillation signal, wherein this biorthogonal mixer is by with this second quadrature local oscillation signal and this first intermediate frequency quadrature signal smear and produce this second intermediate frequency quadrature signal.
12, the single-chip tuner of television system according to claim 11 is characterized in that, a frequency of this second quadrature local oscillation signal is lower than this first intermediate frequency and equals this second intermediate frequency amount.
13, the single-chip tuner of television system according to claim 9 is characterized in that, this polyphase filters connects a channel select filter, and wherein this channel select filter has a passband, and the one intermediate frequency approximates this second intermediate frequency greatly.
14, the single-chip tuner of television system according to claim 9 is characterized in that, more comprises a channel select filter, in conjunction with receiving this second intermediate frequency solid part signal, with a signal of selecting a predetermined frequency band.
15, the single-chip tuner of television system according to claim 14 is characterized in that, more comprises an intermediate frequency variable gain amplifier, to amplify the signal of this selection frequency band.
16, the single-chip tuner of television system according to claim 9 is characterized in that, this low noise amplifier is integrated in this tuner.
17, the single-chip tuner of television system according to claim 9, it is characterized in that, more comprise a channel select filter, in conjunction with to receive this second intermediate frequency solid part signal, with a signal of selecting a predetermined frequency band, and an intermediate frequency variable gain amplifier, to amplify the signal of this selection frequency band, wherein this low noise amplifier also is integrated in this tuner.
18, a kind of TV tuning system includes:
One low noise amplifier is used for receiving and amplified television signal;
One integrated circuit is provided on the substrate, and it comprises:
One quadrature mixer connects this low noise amplifier, to receive this amplified television signal and to produce one first intermediate frequency quadrature signal;
One multiple mixer frequently is in conjunction with to receive orthogonal signalling in this first intermediate frequency quadrature signal and the generation one second;
One polyphase filters is in conjunction with to receive this second intermediate frequency quadrature signal and to produce one second intermediate frequency solid part signal;
One channel select filter is in conjunction with to receive this second an intermediate frequency solid part signal and a signal of selecting in the predetermined channel; And
One intermediate frequency variable gain amplifier amplifies from this signal in this predetermined channel of this channel select filter.
19, TV tuning system according to claim 18, it is characterized in that, more comprise one first local oscillator, one first quadrature local oscillation signal is provided, wherein this quadrature mixer connects this first local oscillator to receive this first quadrature local oscillation signal, reaches by making smear and produce this IF1 orthogonal signalling with this first quadrature local oscillation signal and this amplified television signal.
20, TV tuning system according to claim 19 is characterized in that, the frequency in this first quadrature local oscillation signal is outside the frequency spectrum of this TV signal, and an intermediate frequency that is higher than this predetermined channel equals this first intermediate frequency amount.
21, TV tuning system according to claim 20, it is characterized in that, more comprise one second local oscillator, one second quadrature local oscillation signal is provided, should multiple mixer frequently be to connect this second local oscillator wherein, to receive this second quadrature local oscillation signal and to make smear and produce this two intermediate frequency quadrature signal by this second quadrature local oscillation signal and this first intermediate frequency quadrature signal.
22, TV tuning system according to claim 21 is characterized in that, the frequency in this second quadrature local oscillation signal is lower than this first intermediate frequency and equals this second intermediate frequency amount.
23, TV tuning system according to claim 22 is characterized in that, this channel select filter has the passband that an intermediate frequency approximates this second intermediate frequency.
24, TV tuning system according to claim 18 is characterized in that, this multiple mixer frequently comprises a biorthogonal mixer.
25, a kind of TV tuning system is characterized in that, includes:
One low noise amplifier is used for receiving and amplification one TV signal;
One quadrature mixer is in conjunction with amplifying this TV signal to receive this, with generation one first intermediate frequency quadrature signal;
One multiple mixer frequently is in conjunction with to receive this first intermediate frequency quadrature signal, with generation one second intermediate frequency quadrature signal;
One multiple filter frequently is in conjunction with to receive the signal in this second intermediate frequency quadrature signal, selection one predetermined channel and to produce one of this selection channel second intermediate frequency solid part signal; And
One intermediate frequency variable gain amplifier amplifies this second intermediate frequency solid part signal of this selection channel.
26, TV tuning system according to claim 25, it is characterized in that, more comprise one first local oscillator, one first quadrature intermediate frequency local oscillation signal is provided, wherein this quadrature mixer system connects this first local oscillator, to receive this first quadrature local oscillation signal and to make smear and produce this first intermediate frequency quadrature signal by this first quadrature local oscillation signal and this amplified television signal.
27, TV tuning system according to claim 26 is characterized in that, the frequency in this first quadrature local oscillation signal is outside this TV signal frequency spectrum, and the intermediate frequency that is higher than this predetermined channel equals this first intermediate frequency amount.
28, TV tuning system according to claim 27, it is characterized in that, more comprise one second local oscillator, one second quadrature local oscillation signal is provided, should multiple mixer frequently be to connect this second local oscillator wherein, receiving this second quadrature local oscillation signal, and produce this second intermediate frequency quadrature signal by this second quadrature local oscillation and this first intermediate frequency quadrature signal.
29, TV tuning system according to claim 28 is characterized in that, the frequency in this second quadrature local oscillation signal is to be lower than this first intermediate frequency to equal this second intermediate frequency amount.
30, TV tuning system according to claim 25 is characterized in that, this multiple mixer frequently comprises a biorthogonal mixer.
31, a kind of single-chip tuner that is used for television system is characterized in that, includes:
One quadrature mixer, connect a low noise amplifier to receive a TV signal, and connect one first local oscillator to receive one first quadrature local oscillation signal, wherein this quadrature mixer is by making smear and produce the first intermediate frequency quadrature signal with this first quadrature local oscillation signal and this TV signal;
One biorthogonal mixer in conjunction with receiving this first intermediate frequency quadrature signal, and produces one second intermediate frequency quadrature signal; And
One multiple filter frequently is in conjunction with one of to receive in this second intermediate frequency quadrature signal, selection one predetermined channel signal and to produce one of this selection channel second intermediate frequency solid part signal.
32, the single-chip tuner of television system according to claim 31 is characterized in that, the frequency in this first quadrature local oscillation signal is outside this TV signal frequency spectrum, and an intermediate frequency that is higher than this predetermined channel equals this first intermediate frequency amount.
33, the single-chip tuner of television system according to claim 32, it is characterized in that, this biorthogonal mixer, connect one second local oscillator to receive one second quadrature local oscillation signal, wherein this biorthogonal mixer is by making smear and produce this second intermediate frequency quadrature signal with this second quadrature local oscillation signal and this first intermediate frequency quadrature signal.
34, the single-chip tuner of television system according to claim 33 is characterized in that, the frequency in this second positive local oscillation signal is to be lower than this first intermediate frequency to equal this second intermediate frequency amount.
35, the single-chip tuner of television system according to claim 31 is characterized in that, more comprises an intermediate frequency variable gain amplifier, in conjunction with to amplify by this signal in this predetermined channel of this multiple filter frequently.
36, the single-chip tuner of television system according to claim 31 is characterized in that, is integrated in this tuner in this low noise amplifier.
37, the single-chip tuner of television system according to claim 31, it is characterized in that, more comprise an intermediate frequency variable gain amplifier, in conjunction with to amplify by this signal in this predetermined channel of this multiple filter frequently, wherein this low noise amplifier also is integrated in this tuner.
38, a kind of TV tuning system is characterized in that, includes:
One low noise amplifier is to receive and to amplify a TV signal;
One first local oscillator provides one first quadrature local oscillation signal;
One second local oscillator provides one second quadrature local oscillation signal; And
One integrated circuit is provided in to include on the substrate:
One quadrature mixer, connect this low noise amplifier to receive this amplified television signal, with be connected this first local oscillator to receive this first quadrature local oscillation signal, wherein this quadrature mixer is by making smear and produce one first intermediate frequency quadrature signal with this first quadrature local oscillation signal and this amplified television signal;
One biorthogonal mixer, be incorporated into this quadrature mixer to receive this first intermediate frequency quadrature signal, and connect this second local oscillator to receive this second quadrature local oscillation signal, wherein be somebody's turn to do multiple mixer frequently by making smear and produce one second intermediate frequency quadrature signal with this second quadrature local oscillation signal and this first intermediate frequency quadrature signal;
One multiple filter frequently is in conjunction with one of to receive in this second intermediate frequency quadrature signal and selection one predetermined channel signal; And
One intermediate frequency variable gain amplifier is to amplify by this signal in this predetermined channel of this multiple filter selection frequently.
According to the described TV tuning system of claim 38, it is characterized in that 39, the frequency in this first quadrature local oscillation signal is outside this TV signal frequency spectrum, and the intermediate frequency that is higher than this predetermined channel equals this first intermediate frequency amount.
According to the described TV tuning system of claim 39, it is characterized in that 40, the intermediate frequency that the frequency in this second quadrature local oscillation signal is lower than this predetermined channel equals this first intermediate frequency amount.
41, a kind of TV tuning system is characterized in that, includes:
One low noise amplifier receives and amplification one TV signal;
One first local oscillator provides one first quadrature local oscillation signal;
One second local oscillator provides one second quadrature local oscillation signal;
One quadrature mixer is in conjunction with to receive this amplified television signal, with this first quadrature local oscillation signal and produce one first intermediate frequency quadrature signal;
One multiple mixer frequently is in conjunction with to receive this first intermediate frequency quadrature signal, with this second quadrature local oscillation signal and produce one second intermediate frequency quadrature signal; And
One variable gain is filter frequently again, in conjunction with the signal that receives this second intermediate frequency quadrature signal, selection one predetermined channel and amplify this selection signal.
42, according to the described TV tuning system of claim 41, it is characterized in that, this first quadrature local oscillation signal comprises an in-phase signal and orthogonal signalling, and wherein this quadrature mixer is by making smear and produce this first intermediate frequency quadrature signal with this in-phase signal in this first quadrature local oscillation signal and this orthogonal signalling and this amplified television signal.
According to the described TV tuning system of claim 41, it is characterized in that 43, the frequency in this first quadrature local oscillation signal is outside this TV signal frequency spectrum, and an intermediate frequency that is higher than in this predetermined channel equals this first intermediate frequency amount.
According to the described TV tuning system of claim 43, it is characterized in that 44, this second quadrature local oscillation signal is to be lower than this first intermediate frequency to equal this second intermediate frequency amount.
45, according to the described TV tuning system of claim 41, it is characterized in that, this second quadrature local oscillation signal comprises an in-phase signal and orthogonal signalling, wherein should comprise a biorthogonal mixer by multiple mixer frequently, by making smear and produce this second intermediate frequency quadrature signal with this first intermediate frequency quadrature signal and this second quadrature local oscillation signal.
46, a kind of single-chip tuner that is used for television system is characterized in that, includes:
One quadrature mixer, connect a low noise amplifier to receive a TV signal, with be connected one first local oscillator to receive one first quadrature local oscillation signal, wherein this quadrature mixer is by making smear and produce one first intermediate frequency quadrature signal with this first quadrature local oscillation signal and this TV signal;
One biorthogonal mixer, in conjunction with to receive this first intermediate frequency quadrature signal, with be connected one second local oscillator to receive one second quadrature local oscillation signal, wherein this biorthogonal mixer is by making smear and produce one second intermediate frequency quadrature signal with this second quadrature local oscillation signal and this first intermediate frequency quadrature signal; And
One variable gain is filter frequently again, in conjunction with to receive the signal in this second intermediate frequency quadrature signal, selection one predetermined channel and to amplify this TV signal.
47, according to the single-chip tuner of the described television system of claim 46, it is characterized in that, frequency in this first quadrature local oscillation signal is outside this TV signal frequency spectrum, and an intermediate frequency that is higher than in this predetermined channel equals this first intermediate frequency amount.
According to the single-chip tuner of the described television system of claim 47, it is characterized in that 48, the frequency in this second quadrature local oscillation signal is to be lower than this first intermediate frequency.
According to the single-chip tuner of the described television system of claim 46, it is characterized in that 49, low noise amplifier is to be integrated in this tuner.
50, a kind of TV tuning system is characterized in that, includes:
One low noise amplifier is used for receiving and amplification one TV signal;
One first local oscillator provides one first quadrature local oscillation signal, and it comprises an in-phase signal and orthogonal signalling;
One second local oscillator provides one second quadrature local oscillation signal, and it comprises an in-phase signal and orthogonal signalling; And
One integrated circuit is provided in to include on the substrate:
One quadrature mixer, connect this low noise amplifier to receive this amplified television signal, with be connected this first local oscillator to receive this first quadrature local oscillation signal, wherein this quadrature mixer is by with this in-phase signal in this first quadrature local oscillation signal and this orthogonal signalling and this amplified television signal and produce one first intermediate frequency quadrature signal;
One biorthogonal mixer, be incorporated into this quadrature mixer to receive this first intermediate frequency quadrature signal, with be connected this second local oscillator to receive this second quadrature local oscillation signal, wherein should multiple mixer frequently by making smear and produce one second intermediate frequency quadrature signal with this in-phase signal in this second quadrature local oscillation signal and this orthogonal signalling and this first intermediate frequency quadrature signal; And
One variable gain is filter frequently again, in conjunction with to receive the signal in this second intermediate frequency quadrature signal, selection one predetermined channel and to amplify this selection signal.
51, according to the described TV tuning system of claim 50, it is characterized in that, frequency in this first quadrature local oscillation signal is outside this TV signal frequency spectrum, and an intermediate frequency that is higher than in this predetermined channel equals this first intermediate frequency amount, and wherein the frequency in this second quadrature local oscillation signal is to be lower than this first intermediate frequency.
52, a kind of TV tuner is characterized in that, includes:
One low noise amplifier is used for receiving and amplification one TV signal;
One local oscillator provides a quadrature local oscillation signal;
One quadrature generator is incorporated into this low noise amplifier to receive this amplified television signal, reaches and produces a quadrature radio-frequency signals;
One multiple mixer frequently, be incorporated into this quadrature generator to receive this quadrature radio-frequency signals, with be incorporated into this local oscillator to receive this quadrature local oscillation signal, wherein should multiple mixer frequently by making smear and produce a quadrature intermediate-freuqncy signal with this quadrature local oscillation signal and this orthogonal radio frequency; And
One variable gain is filter frequently again, in conjunction with to receive the signal in this quadrature intermediate-freuqncy signal, selection one predetermined channel and to amplify this selection signal.
According to the described TV tuning system of claim 52, it is characterized in that 53, this quadrature generator, this multiple mixer frequently and this variable gain frequency filter again are formed in the single-chip.
According to the described TV tuning system of claim 52, it is characterized in that 55, this low noise amplifier, this quadrature generator, this multiple mixer frequently and this variable gain frequency filter again are formed in the single-chip.
56, a kind of single-chip tuner that is used for television system is characterized in that, includes:
One quadrature generator connects a low noise amplifier with received television signal, and produces quadrature radio-frequency signals;
One biorthogonal mixer, in conjunction with to receive this quadrature radio-frequency signals, with be connected a local oscillator to receive a quadrature local oscillation signal, wherein this biorthogonal mixer is by making smear and produce a quadrature intermediate-freuqncy signal with this quadrature local oscillation signal and this quadrature radio-frequency signals; And
One variable gain is filter frequently again, in conjunction with one of to receive in this quadrature intermediate-freuqncy signal, selection one predetermined channel signal and to amplify this selection signal.
According to the single-chip tuner of the described television system of claim 55, it is characterized in that 57, this low noise amplifier is integrated in this tuner.
58, a kind of tuning methods that is used for television system is characterized in that, includes the following step:
Receive a TV signal;
Amplify this TV signal;
One first quadrature local oscillation signal is provided;
Utilize this first quadrature local oscillation signal and this amplified television signal to make smear to produce one first intermediate frequency quadrature signal;
One second quadrature local oscillation signal is provided;
Utilize this second quadrature local oscillation signal and this first intermediate frequency quadrature signal to make smear to produce one second intermediate frequency quadrature signal;
Utilize the second intermediate frequency quadrature signal to produce the second intermediate frequency solid part signal; And
Utilize a channel select filter to filter this second intermediate frequency solid part signal to select the signal in the predetermined channel.
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| CNB2004101014506A CN100496098C (en) | 2004-12-20 | 2004-12-20 | Tuner of TV system and tuning method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101790059A (en) * | 2010-03-19 | 2010-07-28 | 常州新超电子科技有限公司 | Television tuner with high Q value tuned filter |
| CN102300061A (en) * | 2010-06-25 | 2011-12-28 | 北京创毅视讯科技有限公司 | Method and device for removing redundant signal and tuning device |
| US8139160B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Television tuner with double quadrature mixing architecture |
| US8139159B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Single down-conversion television tuner |
| US8212943B2 (en) | 2006-10-25 | 2012-07-03 | Mstar Semiconductor, Inc. | Triple-conversion television tuner |
| CN111030599A (en) * | 2018-10-09 | 2020-04-17 | 美光科技公司 | Quadrature signal generation |
-
2004
- 2004-12-20 CN CNB2004101014506A patent/CN100496098C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8139160B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Television tuner with double quadrature mixing architecture |
| US8139159B2 (en) | 2006-10-25 | 2012-03-20 | Mstar Semiconductor, Inc. | Single down-conversion television tuner |
| US8212943B2 (en) | 2006-10-25 | 2012-07-03 | Mstar Semiconductor, Inc. | Triple-conversion television tuner |
| CN101790059A (en) * | 2010-03-19 | 2010-07-28 | 常州新超电子科技有限公司 | Television tuner with high Q value tuned filter |
| CN102300061A (en) * | 2010-06-25 | 2011-12-28 | 北京创毅视讯科技有限公司 | Method and device for removing redundant signal and tuning device |
| CN111030599A (en) * | 2018-10-09 | 2020-04-17 | 美光科技公司 | Quadrature signal generation |
| CN111030599B (en) * | 2018-10-09 | 2021-09-07 | 美光科技公司 | Quadrature signal generation |
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|---|---|
| CN100496098C (en) | 2009-06-03 |
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