CN106712786B - A kind of wideband receiver front end circuit that bandwidth is continuously adjustable - Google Patents
A kind of wideband receiver front end circuit that bandwidth is continuously adjustable Download PDFInfo
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- CN106712786B CN106712786B CN201611159394.0A CN201611159394A CN106712786B CN 106712786 B CN106712786 B CN 106712786B CN 201611159394 A CN201611159394 A CN 201611159394A CN 106712786 B CN106712786 B CN 106712786B
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- signal
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- amplifier
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- mixer
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- 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
-
- 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
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
Abstract
The invention discloses the wideband receiver front end circuits that a kind of bandwidth is continuously adjusted, including low-noise amplifier, main frequency mixer, transconductance stage circuit, trans-impedance amplifier, export buffer stage circuit and feedback control loop, after low-noise amplifier is amplified radiofrequency signal, amplified radiofrequency signal is converted into voltage intermediate frequency signal by main frequency mixer, voltage intermediate frequency signal is converted to current signal by transconductance stage circuit, after current signal is converted electrical current into voltage signal by trans-impedance amplifier and amplifies and filter again, it is handled by exporting digit chip outside buffer stage circuit output to piece；For feedback control loop by the Miller effect of loop amplifier therein, the clutter filtering of voltage intermediate frequency signal not only may be implemented in the value for amplifying high-pass filtering capacitance in feedback control loop, while can save intermediate frequency filtering capacitance.The present invention effectively reduces the entire area of chip, while can realize the continuous variable of bandwidth, moreover it is possible to further decrease the equivalent conduction impedance of frequency mixer, inhibit out-of-band interference signal.
Description
Technical field
The invention belongs to multimode multi-standard receiver field, more particularly to before the continuously adjustable broadband receiver of a kind of bandwidth
Terminal circuit.
Background technology
With being continuously increased for multimode multi-standard communication carrier frequency range, the complexity and cost of narrowband multimode rake receiver are also big
Big to increase, the development of narrowband multi-mode structure, which is evolved, does not have sustainability, and broadband multimode multi-standard receiver has carrier frequency frequency
The features such as rate range is wide, signal dynamics model is big, channel bandwidth change range is wide, thus broadband multimode connect multi-standard receiver circuit at
For the trend of multimode multi-standard receiver development.
But it realizes the intermediate-frequency bandwidth suitable for various communication standards, has to place a large amount of intermediate frequency filtering in the chip
Capacitance, as shown in Figure 1, be existing wideband receiver front end circuit, by low-noise amplifier, main frequency mixer, transconductance stage circuit,
Trans-impedance amplifier, intermediate frequency filtering capacitance and output buffer stage circuit are constituted, and the low-noise amplifier docking collection of letters number carries out preliminary
After signal amplification, radiofrequency signal is converted to by voltage intermediate frequency signal by main frequency mixer, intermediate frequency filtering capacitance believes voltage of intermediate frequency
Ripple in number is filtered, and filtered voltage intermediate frequency signal is converted to current signal by transconductance stage, passes through trans-impedance amplifier
After further being amplified and filtered, handled by exporting digit chip outside buffer stage circuit output to piece.Due in
The volume of frequency filter capacitor is bigger, significantly increases the area of chip in this way so that the cost of chip increases, and hinders more
The commercialization process of mould multi-standard receiver.Simultaneously because the selection solidification of chip capacitance size, designed bandwidth may
Variation is generated with the fluctuation of chip technology, therefore reduces the yield rate of chip.
Invention content
Goal of the invention：In view of the problems of the existing technology, the present invention provides a kind of effective bands for reducing chip area
The continuously adjustable wideband receiver front end circuit of width.
Technical solution：The present invention provides the wideband receiver front end circuits that a kind of bandwidth is continuously adjusted, including low noise
Amplifier, main frequency mixer, transconductance stage circuit, trans-impedance amplifier, output buffer stage circuit and feedback control loop, the low noise amplification
After device is amplified radiofrequency signal, amplified radiofrequency signal is converted into voltage intermediate frequency signal, mutual conductance by main frequency mixer
Voltage intermediate frequency signal is converted to current signal by grade circuit, and current signal converts electrical current into voltage again by trans-impedance amplifier
After signal and amplification and filtering, handled by exporting digit chip outside buffer stage circuit output to piece；The feedback control loop
By the Miller effect of loop amplifier therein, amplify the clutter in the value realization voltage intermediate frequency signal of capacitance in feedback control loop
Filtering.
Further, the feedback control loop includes loop amplifier, loop high-pass filtering capacitance, auxiliary mixer, the ring
The input terminal of road amplifier is connect with the output end of main frequency mixer, and the output end of the loop amplifier passes through loop high-pass filtering
The first input end of capacitance and auxiliary mixer connects, and the second input terminal of the auxiliary mixer is connect with local oscillation signal, institute
The output end for stating auxiliary mixer is connect with the output end of amplifier in a low voice.
Operation principle：The present invention increases a feedback control loop at the both ends of main frequency mixer, and the loop in feedback control loop is high
Pass filter capacitance is connected across loop amplification by mixer action under the uppermixing of auxiliary mixer in feedback control loop and main frequency mixer
The input of device, output end make loop amplifier generate Miller effect.To only need to use capacitance very little in entire circuit
Capacitance can realize identical intermediate-frequency bandwidth.
Advantageous effect：Compared with prior art, the present invention not only effectively reduces the entire area of chip, while can
Realize the continuous variable of bandwidth, furthermore, due to the negative voltage feedback effect of loop, the equivalent conducting of frequency mixer can be further decreased
Impedance preferably inhibits out-of-band interference signal to further improve Out-of-band rejection.
Description of the drawings
Fig. 1 is existing wideband receiver front end circuit；
Fig. 2 is the circuit diagram of the present invention；
Fig. 3 is the inside and outside change in gain of band of available circuit and the present invention in low-noise amplifier output end, and works as loop
When amplifier gain consecutive variations, the situation of change schematic diagram of bandwidth and Out-of-band rejection.
Specific implementation mode
Further explanation is done to the present invention below in conjunction with the accompanying drawings.
As shown in Fig. 2, the wideband receiver front end circuit that a kind of bandwidth provided by the invention is continuously adjustable, including low noise
Amplifier, main frequency mixer, transconductance stage circuit, trans-impedance amplifier, output buffer stage circuit and feedback control loop, wherein low noise is put
Big device carries out after tentatively amplifying radiofrequency signal, and preliminary amplified radiofrequency signal is converted into voltage of intermediate frequency by main frequency mixer
Signal, voltage intermediate frequency signal are separately input in feedback control loop and transconductance stage circuit, and transconductance stage circuit turns voltage intermediate frequency signal
It is changed to current signal, current signal is again converted to voltage signal by trans-impedance amplifier and after amplification and filtering, passes through output
Digit chip is handled outside buffer stage circuit output to piece；Feedback control loop includes loop amplifier, loop high-pass filtering electricity
Hold and auxiliary mixer, loop amplifier, which exports, connects one end of loop high-pass filtering capacitance, loop high-pass filtering capacitance it is another
Auxiliary mixer is terminated, auxiliary mixer carries out the signal that the local oscillation signal received and loop high-pass filtering capacitance export
The output end of low-noise amplifier is output to after mixing, the output end in low-noise amplifier and preliminary amplified radiofrequency signal
It does and subtracts each other processing, subtract each other that treated that signal enters under main frequency mixer is carried out with local oscillation signal is mixed.Loop high-pass filtering
Capacitance is connected across input, the output end of loop amplifier by mixer action under the uppermixing of auxiliary mixer and main frequency mixer,
Make loop amplifier generate Miller effect, loop high-pass filtering capacitance loop amplifier input terminal by equivalent amplification 1+A0
Times, A0It is the gain of loop amplifier.
As shown in figure 3, due to the Miller effect of loop amplifier so that loop high-pass filtering capacitor equivalent is exaggerated 1+
A0Times, A0It is the gain of loop amplifier.By taking four phase passive frequency mixers as an example, the impedance seen from LNA output ends is：
Wherein, ZLNAFor LNA itself output impedances, RswFor the conducting resistance of main frequency mixer or auxiliary mixer, in this implementation
Main frequency mixer and auxiliary mixer use identical frequency mixer in example, so the conducting resistance of the frequency mixer used is also the same
, ω is input frequency, ωLOIt is local frequency, CHPFFor loop high-pass filtering capacitance.C is can see in LNA output endsHPFPhase
When in being exaggerated 1+A0Times.If being continuously increased the gain of loop amplifier, it is seen that the intermediate frequency of loop high-pass filtering capacitor equivalent
Filtering capacitance is continuously increased, and bandwidth constantly narrows, therefore compared with prior art, realize the required electricity of the same band present invention
Capacitance is greatly reduced.To can effectively reduce the area of chip using front-end circuit provided by the invention.
Loop amplifier can such as use difference common-source amplifier structure, when external bias controls its tail there are many selection
When curent change, voltage gain just changes therewith, because tail current can be with consecutive variations, therefore the gain of loop amplifier can
To realize consecutive variations, consecutive variations are also achieved to the bandwidth of circuit.
Since the negative voltage feedback of feedback control loop acts on, the conducting resistance R of frequency mixerswIt is reduced to original 1+A0Times, band
Outer gain becomes lower, more further than present mode as shown in Figure 3 in this way to increase Out-of-band rejection, to improve circuit
Anti-interference ability.
The above is only a preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (1)
1. a kind of continuously adjustable wideband receiver front end circuit of bandwidth, it is characterised in that：Including low-noise amplifier, main mixing
Device, transconductance stage circuit, trans-impedance amplifier, output buffer stage circuit and feedback control loop, feedback control loop include loop amplifier, loop
High-pass filtering capacitance, auxiliary mixer；The input terminal of the loop amplifier is connect with the output end of main frequency mixer, loop amplification
The output end of device is connected with loop high-pass filtering capacitance one end, the other end of loop high-pass filtering capacitance and auxiliary mixer
Input terminal is connected, and the output end of the auxiliary mixer and the output end of low-noise amplifier, which subtract each other, is followed by the defeated of main frequency mixer
Enter end, the input terminal of low-noise amplifier receives radio-frequency input signals；Local oscillation signal connects main frequency mixer and auxiliary mixer respectively
Switch control terminal；The output end of the main frequency mixer connects with the input terminal of transconductance stage, the output end of transconductance stage with across resistance grade
Input terminal connect, across the input terminal of the output termination buffer stage of resistance grade, the output end of buffer stage exports final signal；
The low-noise amplifier is amplified input radio frequency signal, the letter of amplified radiofrequency signal and feedback control loop feedback
Voltage intermediate frequency signal is converted by main frequency mixer after number subtracting each other, voltage intermediate frequency signal is converted to electric current and believed by transconductance stage circuit
Number, after current signal is converted electrical current into voltage signal by trans-impedance amplifier and amplifies and filter again, passes through and export buffering
Grade circuit output；The feedback control loop amplifies feedback control loop intermediate ring road high pass by the Miller effect of loop amplifier therein
The value of filter capacitor realizes the clutter filtering in voltage intermediate frequency signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159394.0A CN106712786B (en) | 2016-12-15 | 2016-12-15 | A kind of wideband receiver front end circuit that bandwidth is continuously adjustable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611159394.0A CN106712786B (en) | 2016-12-15 | 2016-12-15 | A kind of wideband receiver front end circuit that bandwidth is continuously adjustable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106712786A CN106712786A (en) | 2017-05-24 |
| CN106712786B true CN106712786B (en) | 2018-10-23 |
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| CN201611159394.0A Active CN106712786B (en) | 2016-12-15 | 2016-12-15 | A kind of wideband receiver front end circuit that bandwidth is continuously adjustable |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR102419643B1 (en) * | 2018-03-29 | 2022-07-11 | 삼성전자주식회사 | Current-to-voltage converter providing a variable bandwidth and apparatus including the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7933361B2 (en) * | 2006-04-05 | 2011-04-26 | Integrated System Solution Corp. | Hybrid DC-offset reduction method and system for direct conversion receiver |
| US8428533B2 (en) * | 2010-06-08 | 2013-04-23 | Qualcomm, Incorporated | Techniques for optimizing gain or noise figure of an RF receiver |
| US9025709B2 (en) * | 2013-05-30 | 2015-05-05 | Mediatek Inc. | Receiver front-end circuit, communication unit and method therefor |
| CN106059604B (en) * | 2016-05-24 | 2018-08-10 | 东南大学 | A kind of antiblocking receiving radio frequency front end structure based on Signal separator |
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