CN103684274B - There is the wideband low noise amplifier of single-ended transfer difference ability and filter action - Google Patents
There is the wideband low noise amplifier of single-ended transfer difference ability and filter action Download PDFInfo
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Abstract
The invention provides a kind of wideband low noise amplifier with single-ended transfer difference ability and filter action, described amplifier comprises three transconductance stage, feedback network and loads; The first transconductance stage is in parallel with the second transconductance stage, and adopt these two transconductance stage in parallel as input, wherein the first transconductance stage output converts differential signal to single-ended signal by feedback network, feed back to voltage input end and form loop, the output of the first transconductance stage is by the output of the 3rd transconductance stage, superimposed with the output of the second transconductance stage simultaneously. The present invention, in realizing wideband low noise amplification and LC narrow-band filtering, does not need between to insert driving stage or transconductance stage, thereby has effectively improved the linearity and the noiseproof feature of circuit; The present invention has realized single slip point function, and the output of two-way balance, has ensured good IIP2 performance; And the present invention utilizes noise cancellation technique, eliminate because the transistor noise that impedance matching is introduced.
Description
Technical field
The invention belongs to communication technical field, relate to a kind of low-noise amplifier, particularly relate to one and there is single-ended turningThe wideband low noise amplifier of difference ability and filter action.
Background technology
At the RF of broadband receiver input front end, except the most basic low noise amplification and impedance matching requirement, pastContact need to meet other requirements, comprises tracking filter (TrackingFiltering), single-ended transfer difference, highly stable twoThe rank linearity, and more and more lower power consumption etc. A kind of more common way that can meet these requirements is exactly: radio frequency(RF) signal is through after the network or low-noise amplifier of single-ended transfer difference, through (Buffer) level and the mutual conductance (Gm) of overdrivingLevel is connected in filtering load and completes narrow-band tracking (tracking) filtering, arrives frequency mixer more afterwards through (Buffer) level of overdriving(Mixer). Wherein can consume many as driving (Buffer) level and mutual conductance (Gm) level of intergrade (InterfaceStage)Power consumption and area, limit the overall linearity and noise simultaneously. In order to meet these requirements above-mentioned, and to the greatest extentAmount reduces the impact of intergrade on performance, below the structure of conventional wideband low noise amplifier is analyzed.
Conventional wideband low noise amplifier structure is at present a lot of all based on single-ended input Single-end output.
Wherein the simplest structure comes from the single tube of common grid (Common-gate) or common source (Common-Source)Amplify. Wherein common source (Common-Source), although add that the structure of input resistance coupling in parallel is very simple, but still is often madeWith. The common shortcoming of these structures is noiseproof feature and the impedance matching performance that is difficult to simultaneously reach.
Except single tube amplifier and simple feedback amplifier, in order to reach lower in realizing impedance matchingNoise coefficient, the technology that a lot of wideband low noise amplifier structures adopt noises to eliminate. For example, Brooker Rayleigh was in 2004IEEEJSSC publishes thesis and " adopts the wideband low noise amplifier (Wide-BandCMOSLow-of thermal noise technology for eliminatingNoiseAmpliferExploitingThermalNoiseCanceling) structure proposing ", has realized inputThe elimination of pipe arrangement noise. Afterwards, similarly structure applications is in DTV Tuner chip, such as, Gu Puta was at IEEE in 2007Paper " Direct Conversion TV tuner (the A48to860MHzCMOSDirect-of 48～860MHz that ISSCC deliversConversionTVTuner) ", adopted similar structure. But the shortcoming of this structure is to be difficult to obtain wellIIP2 performance. The paper that 2009 Nian Dong state English are published in IEEEJSSC " is applied to digital TV tuner, adopts noise and twoWideband low noise amplifier (the AWidebandCMOSLowNoiseAmplifer of rank Nonlinear elimination technologyEmployingNoiseandIM2DistortionCancellationforaDigitalTVT uner) ", it is adoptedBy the method for current mirror and CMOS, not only retain the ability that noise is eliminated, more can improve to a certain extent single-ended defeatedEnter the IIP2 performance of Single-end output LNA. But the shortcoming of this structure is: current mirror has limited the bandwidth of circuit working, and electricityStream mirror itself can be introduced a lot of noises, and the quality of the two rank linearities is relevant with the coupling of PMOS and NMOS to a great extent, thisJust make the Performance Ratio of IIP2 more responsive. The structure of the wideband low noise amplifier of more than introducing, although can realize lowerNoise coefficient, but all cannot meet the requirement for single-ended transfer difference on chip, and all be difficult to reach reasonable two rankThe linearity.
But low-noise amplifier (LNA) structure that can realize single-ended transfer difference in broadband is also few, for example, BradleyGram Mel published thesis on IEEEJSSC in 2008, and " can reach balance output, noise is eliminated and Nonlinear elimination wide simultaneouslyBand single-ended transfer difference low-noise amplifier (WidebandBalun-LNAWithSimultaneousOutputBalancing, Noise-CancelingandDistortion-Canceling) ", it has proposed single-ended input, and difference is defeatedGo out, and can eliminate Input matching low-noise amplifier (LNA) structure of bank tube noise altogether. But the shortcoming of this structure is:The Voltage-output being balanced, the output load resistance value of its two differential circuits needs different large. Like this, similar LCTankSuch load filter circuit just can not directly be connected on its output. If must realize filtering, just need to be negative at LNA and filteringBetween carrying, insert one-level transconductance stage (Gm) or drive (Buffer) level (being similar to above-mentioned general way), both having limited and made an uproar like thisAcoustic performance, has also affected linearity performance, has also increased extra power consumption; For example, Lu Zhiyu sends out on IEEEJSSC in 2010Table paper " is applied to low noise harmonic wave and suppresses radio frequency sampling receiver, work in tunable filter and the linearity of 300～800MLow-noise amplifier (A300-800MHzTunableFilterandLinearizedLNAAppliedinaLow-NoiseHarmonic-RejectionRF-SamplingReceiver) ", it proposes to adopt reverse CMOS(invertingCMOSstage) the single-ended transfer difference structure that cascade realizes. Although can realizing on sheet, this structure singly turns two, due to defeatedGo out and cannot realize filtering, filter circuit has been placed on to radio frequency (RF) input, thereby has caused Input matching smaller bandwidth. In addition,Although IIP3 is guaranteed by the method for pre-linear (post-linearization), its reasonable IIP2 in essenceOr obtain by the coupling of PMOS and NMOS, thereby more responsive. But owing to not adopting noise cancellation technique, whole electricityThe noise coefficient on road is larger; For example, eastern state English was at the IEEETransactionsonMicrowaveTheory of 2010On andTechniques, publish thesis " be applied to digital TV tuner, employing noise and two rank Nonlinear elimination technologyWideband low noise amplifier (ACMOSActiveFeedbackBalun-LNAWithHighIIP2forWidebandDigitalTVReceivers) ", it has proposed to realize single-ended transfer difference by differential pair, and by differential-to-single-ended anti-Feedback realizes the structure of Broadband Matching. This structure has highly stable IIP2 performance and very symmetrical difference output. ButIts shortcoming is the directly coupling of impact input of impedance operator of output, thereby cannot realize low noise amplification and filter in one-levelRipple, extra mutual conductance meeting limit noise and the linearity increase power consumption and area simultaneously; For example, wheat abundant was at IEEE in 2011On JSSC, publishing thesis, " area is 0.46mm2, and noise coefficient is 4dB, and the Whole frequency band that is applied to that 65nmCMOS technique realizes movesReceiver front end (the A0.46-mm24-dBNFUnifiedReceiverFront-EndforFull-Band of moving TVMobileTVin65-nmCMOS) ", the noise canceller circuit proposing based on Nuo Ta team, becomes a part of mutual conductance into AC and connectsConnect, and it is defeated to make to insert multistage difference current balancer (DCB-DifferentialCurrentBalancer) circuitThe balance-dividing of going on business, has realized and has reasonablely singly turned two. And because output loading is identical, this structure can directly meet LC in outputNarrow-band filtering. The shortcoming of this structure is: the balance of output two-way realizes by multistage DCB circuit, is so limited to circuitVoltage margin (Headroom), be limited to again the regulating power of DCB circuit. When its regulating power is subject to, to input still face in limited timeFace the choice of noise coefficient and impedance matching. But the IIP2 Performance Ratio of this circuit is more responsive, is easily subject to power supply, load and DCBThe impact of circuit performance; For example, Da Niluo has delivered paper and " has had two rank Nonlinear eliminations on the IEEEJSSC of 2012Active double circuit (the ABroadbandLow-PowerLow-NoiseActive that singly turns of broadband low-power consumption low noise of abilityBalunWithSecond-OrderDistortionCancellation) ", eliminate electricity at the noise of Nuo Ta team equallyOn roadbed plinth, propose to adopt common-mode feedback to improve the single-ended transfer difference structure of the two rank linearities. Although this structure can be realNow preferably IIP2 and NF, but due to the imbalance of output two-way load, unless use extra driving (Buffer) level orPerson's mutual conductance (Gm) level, not so the such load filter circuit of similar LCTank just can not be realized.
Therefore, also do not see and can in one-level, can realize single-ended transfer difference at present, there is LC filter action, andThere is low-down noise and the wideband low noise amplifier structure of stablizing the two rank linearities.
Summary of the invention
The shortcoming of prior art in view of the above, the object of the present invention is to provide one to have single-ended transfer difference abilityWith the wideband low noise amplifier of filter action, do not there is filter for the structure that solves prior art wideband low noise amplifierRipple effect, and the problem of the linearity performance, noiseproof feature and the impedance matching performance that are difficult to simultaneously reach.
For achieving the above object and other relevant objects, the invention provides that one has single-ended transfer difference ability and filtering is doneWith wideband low noise amplifier. Described wideband low noise amplifier comprises: the first transconductance stage, the second transconductance stage, the 3rd mutual conductanceLevel, feedback network and the first load;
The first transconductance stage and the second transconductance stage, the first transconductance stage is in parallel with the second transconductance stage, described the first transconductance stage defeatedEnter end and be connected with a voltage input end, the first output of the first transconductance stage is connected with the first input end of the 3rd transconductance stage, theThe second output of one transconductance stage is connected with the second input of the 3rd transconductance stage; The input of the second transconductance stage and described voltageInput is connected, and the first output of the second transconductance stage is connected with the first output of described the 3rd transconductance stage, the second transconductance stageThe second output be connected with the second output of the 3rd transconductance stage; The first transconductance stage and the second transconductance stage are for input voltage;
Feedback network, the output of feedback network is connected with described voltage input end, the first input end of feedback network withThe second output of described the first transconductance stage is connected, the first output of the second input of feedback network and described the first transconductance stageEnd is connected; Described feedback network is used for converting the differential signal of described the first transconductance stage to single-ended signal, and feeds back to voltageInput forms backfeed loop;
The 3rd transconductance stage, the first input end of the 3rd transconductance stage is connected with the first output of described the first transconductance stage, theThe second input of three transconductance stage is connected with the second output of described the first transconductance stage, the first output of the 3rd transconductance stage withThe first output of described the second transconductance stage is connected, the second output of the 3rd transconductance stage and described the second transconductance stage second defeatedGoing out end is connected; Electric current and second transconductance stage of described the 3rd transconductance stage for the voltage transitions of described the first transconductance stage output is becomeThe electric current of output is superimposed;
The first load, one end of the first load is connected with the first output of described the 3rd transconductance stage, the first load anotherOne end is connected with the second output of described the 3rd transconductance stage; Described the first load is for generation of the differential voltage signal of arrowband.
Preferably, described feedback network comprises the second load, feedback resistance and feedback amplifier.
Preferably, one end of described feedback resistance is connected with described voltage input end, the other end of feedback resistance with described inThe output of feedback amplifier is connected.
Preferably, the first input end of described feedback amplifier is connected with one end of the second load, of feedback amplifierTwo inputs are connected with the other end of the second load.
Preferably, the voltage signal that described the first transconductance stage produces in the second load is through described feedback amplifier and instituteState feedback resistance and feed back to voltage input end.
Preferably, described the first load is passive narrow-band filtering circuit or the load circuit with change of frequency.
Preferably, the phase place that the noise of described the first transconductance stage output is exported by the 3rd transconductance stage, described in passing throughThe single spin-echo that feedback network is exported through the second transconductance stage again.
As mentioned above, the wideband low noise amplifier with single-ended transfer difference ability and filter action of the present invention,There is following beneficial effect:
1, the circuit structure that the present invention proposes realize wideband low noise amplify with LC narrow-band filtering in, need to beInsert extra driving (Buffer) level or mutual conductance (Gm) level between the two, thus effectively improved integrated circuit the linearity andNoiseproof feature.
2, the present invention has realized single-ended transfer difference function, and two-way is the output of balance very, has also ensured extraordinary IIP2Performance.
3, the present invention has also utilized noise cancellation technique, and noise requirements and impedance matching are required to be separated, eliminated because ofFor the transistorized noise that impedance matching is introduced, reach extraordinary noiseproof feature.
Brief description of the drawings
Fig. 1 is shown as conventional wideband low noise amplifier realizes the circuit diagram of narrow-band filtering.
What Fig. 2 was shown as topological A singly turns double circuit schematic diagram.
What Fig. 3 was shown as topological B singly turns double circuit schematic diagram.
What Fig. 4 was shown as topological C singly turns double circuit schematic diagram.
Fig. 5 is shown as the wideband low noise amplifier with single-ended transfer difference ability and filter action of the present inventionSchematic diagram.
Fig. 6 is shown as that to the present invention includes the broadband with single-ended transfer difference ability and filter action of concrete feedback network lowThe schematic diagram of noise amplifier.
Element numbers explanation
1 first transconductance stage
2 second transconductance stage
3 the 3rd transconductance stage
4 feedback networks
5,41 loads
42 feedback resistances
43 feedback amplifiers
Detailed description of the invention
Below, by specific instantiation explanation embodiments of the present invention, those skilled in the art can be by this descriptionDisclosed content is understood other advantages of the present invention and effect easily. The present invention can also be by other different concrete realityThe mode of executing is implemented or is applied, and the every details in this description also can, based on different viewpoints and application, not deviate fromUnder spirit of the present invention, carry out various modifications or change.
Refer to accompanying drawing. It should be noted that, the diagram providing in the present embodiment only illustrates the present invention in a schematic wayBasic conception, satisfy and only show with assembly relevant in the present invention in graphic but not component count, shape while implementing according to realityShape and size are drawn, and when its actual enforcement, kenel, quantity and the ratio of each assembly can be a kind of random change, and its assembly clothOffice's kenel also may be more complicated.
Below in conjunction with embodiment and accompanying drawing, the present invention is described in detail.
As shown in Figure 1, RF signal is through the net of single-ended transfer difference for the conventional wideband low noise amplifier of realizing narrow-band filteringAfter network or low-noise amplifier, be connected in filtering load and complete arrowband through overdrive (Buffer) level and mutual conductance (Gm) levelFollow the tracks of (tracking) filtering, arrive frequency mixer (Mixer) through (Buffer) level of overdriving again afterwards. Wherein as intergrade(InterfaceStage) driving (Buffer) level and mutual conductance (Gm) level can consume many power consumption and area, simultaneously restrictionThe linearity and the noise of entirety.
Singly turn double circuit and have a variety of topological structures, topological A as shown in Figure 2, it adopts mode the most intuitively to realizeSingle-ended transfer difference, for example, " be applied to low noise harmonic wave and suppress radio frequency sampling receiver, work in the adjustable of 300～800MWave filter and linearity low-noise amplifier (A300-800MHzTunableFilterandLinearizedLNAAppliedinaLow-NoiseHarmonic-RejectionRF-SamplingReceiver) " adopted this kind of knotStructure, but this structure faces the problem of resistance matching problem and noise coefficient. Topological B as shown in Figure 3, it has comprised a lotWhat add common source based on common grid singly turns double circuit. Such as " can reach balance output, the broadband of noise elimination and Nonlinear elimination simultaneouslySingle-ended transfer difference low-noise amplifier (WidebandBalun-LNAWithSimultaneousOutputBalancing,Noise-CancelingandDistortion-Canceling) ", " area is 0.46mm2, and noise coefficient is 4dB, 65nmReceiver front end (the A0.46-mm24-dBNFUnified that is applied to Whole frequency band mobile TV that CMOS technique realizes" and " there are two rank non-linear ReceiverFront-EndforFull-BandMobileTVin65-nmCMOS)Active double circuit (the ABroadbandLow-PowerLow-Noise that singly turns of broadband low-power consumption low noise of elimination abilityActiveBalunWithSecond-OrderDistortionCancellation) " wherein the Gm1 of forward provide can be defeatedEnter Broadband Matching, its noise can be eliminated, thereby realizes lower noise factor number. " area is 0.46mm2, noise coefficientFor 4dB, the receiver front end (A0.46-mm24-dBNF that is applied to Whole frequency band mobile TV that 65nmCMOS technique realizes" and " there are two rank UnifiedReceiverFront-EndforFull-BandMobileTVin65-nmCMOS)Active double circuit (the ABroadbandLow-PowerLow-that singly turns of broadband low-power consumption low noise of Nonlinear elimination abilityNoiseActiveBalunWithSecond-OrderDistortionCancellation) " by some feedbacksMethod is improved to topological B, and it exports the degree of balance or two rank linearities. But topological B still faces output, difference is flatThe balance (trade-off) of weighing apparatus, noise and impedance matching. In the time that noise and impedance matching are all relatively good, output two differential circuitsImbalance makes it cannot directly connect filtering load circuit. Topological C as shown in Figure 4, it has comprised and similarly " has been applied to broadband numberThe active feedback list with the better two rank linearities of word television receiver turns two low-noise amplifier (ACMOSActiveFeedbackBalun-LNAWithHighIIP2forWidebandDigitalTVReceive rs) " circuit knotStructure, it realizes Input matching by producing differential-to-single-ended feedback, ensures the balance of output two differential circuits simultaneously, and topological C lacksPoint is the directly coupling of impact input of impedance operator of output, thereby cannot directly connect filtering load.
Embodiment
The present embodiment provides a kind of wideband low noise amplifier with single-ended transfer difference ability and filter action, as Fig. 5Shown in, described wideband low noise amplifier comprises: the first transconductance stage 1, the second transconductance stage 2, the 3rd transconductance stage 3, feedback network 4,With load 5. Wherein, as shown in Figure 6, feedback network 4 comprises load 41, feedback resistance 42(Rfb) and feedback amplifier 43(Amp-fb). The inner annexation of width low-noise amplifier is: the first transconductance stage 1 and the second transconductance stage 2, the first transconductance stage 1In parallel with the second transconductance stage 2, the input of the first transconductance stage 1 is connected with a voltage input end Vin, first of the first transconductance stage 1Output is connected with the first input end of the 3rd transconductance stage 3, of the second output of the first transconductance stage 1 and the 3rd transconductance stage 3Two inputs are connected; The input of the second transconductance stage 2 is connected with described voltage input end Vin, the first output of the second transconductance stage 2End is connected with the first output of described the 3rd transconductance stage 3, the of the second output of the second transconductance stage 2 and the 3rd transconductance stage 3Two outputs are connected; One end of the load 41 of feedback network 4 is connected with the first input end of feedback amplifier 43, load 41 anotherOne end is connected with the second input of feedback amplifier 43, one end phase of the output of feedback amplifier 43 and feedback resistance 42Connect, the other end of feedback resistance 42 is connected with voltage input end. The first input end of the 3rd transconductance stage 3 and described the first transconductance stageThe first output of 1 is connected, and the second input of the 3rd transconductance stage 3 is connected with the second output of described the first transconductance stage 1, theThe first output of three transconductance stage 3 is connected with the first output of the second transconductance stage 2, the second output of the 3rd transconductance stage 3 withThe second output of described the second transconductance stage 2 is connected; One end of load 5 is connected with the first output of the 3rd transconductance stage 3, load5 the other end is connected with the second output of the 3rd transconductance stage 3; Wherein, the first transconductance stage 1 and the second transconductance stage 2 are for inputVoltage; Described feedback network 4 is for converting the dual-port of described the first transconductance stage 1 to single port, and feeds back to voltage inputEnd forms backfeed loop. Electric current and the second transconductance stage that the 3rd transconductance stage 3 becomes for the voltage transitions that described transconductance stage 1 is exportedThe electric current of 2 outputs is superimposed; Described load 5 is for generation of the differential voltage signal of arrowband.
The present embodiment passes through univoltage input Vin, and adopts two the first transconductance stage 1 in parallel and the second transconductance stage 2As input, the voltage signal that the electric current that wherein said transconductance stage 1 is exported produces in load 41 is on the one hand by feedback network 4Middle feedback amplifier 43 and feedback resistance 42 make its differential signal convert single-ended signal to, and are fed back to voltage input endVin forms backfeed loop, realizes the Broadband Matching of voltage input end Vin. The first transconductance stage 1 produces in load 41 on the other handElectric current voltage signal, that export by the 3rd transconductance stage 3, superimposed with the output current of the second transconductance stage 2, this electric currentAfter overload 5 filtering, produce the differential voltage signal of arrowband, the wideband low noise of having realized single-stage amplifies and narrow-band filtering.Described load 5 can be passive narrow-band filtering circuit or the load circuit with change of frequency. Finally, output cathode voltageAnd cathode voltage, realize single-input double-output.
The structure of the wideband low noise amplifier that the present embodiment provides has following characteristics:
1, the two differential circuits that enters load 5 can connect identical load, and the second transconductance stage 2 and the 3rd transconductance stage3 output impedance are high resistant, and the structure of described this wideband low noise amplifier can directly connect the load electricity with change of frequencyRoad, comprises the narrow-band filtering circuit that LC oscillating circuit forms, or rear class load impedance, for example, and the input impedance of frequency mixer etc.;Because the structure of this wideband low noise amplifier can directly connect LC filtering load, low noise amplification and narrow-band filtering are reducedIntergrade, be conducive to realize good global noise and the linearity;
2, described wideband low noise amplifier utilizes the buffer action of the 3rd transconductance stage 3, can realize input broadband simultaneouslyCoupling and output narrow-band filtering, and between be independent of each other;
3, after the conversion of described wideband low noise amplifier through the first transconductance stage 1 and the second transconductance stage 2, it is poor to have becomePoint two-way, circuit afterwards such as, as long as the 3rd transconductance stage 3 and load 5, can be fully differential circuit, like this first mutual conductanceLevel 1 and the second transconductance stage 2 have good single-ended transfer difference performance, just can obtain amplitude and phase at the output of this amplifierThe good difference output of position coupling. And such transconductance stage realizes than being easier to.
4, because the 3rd transconductance stage 3 and load 5 are fully differential circuit, this amplifier will obtain reasonable IIP2 performance,Just depend on the two rank linearities of the first transconductance stage 1, the second transconductance stage 2 and feedback network. As long as take suitable circuit, firstThe two rank linearities of transconductance stage 1, the second transconductance stage 2 and feedback network can be accomplished relatively good and stable, so, this amplifier fromIn principle, say and can obtain the reasonable two rank linearities.
5, can find according to noise analysis, the first transconductance stage 1 is as the necessary part of realizing Input matching, its outputNoise arrives the phase place of output by the 3rd transconductance stage 3, and arrive output through second transconductance stage 2 again by feedback network 4Phase place is just in time contrary, and so under certain condition, the output noise of the first transconductance stage 1 can be eliminated. Greatly reduce like thisDeterioration because impedance matching requires to noise. And the noise of the 3rd transconductance stage 3 can be decayed by prime amplification, making an uproar like thisIt is main in sound contribution, only having the second transconductance stage 2, and described amplifier can be realized low-down noise coefficient, and does not affect wideDegree matching performance;
6, described amplifier is full symmetric, thus can switch at any time fully differential pattern, to reach better propertyEnergy.
The wideband low noise amplifier 1 with single-ended transfer difference ability and filter action provided by the present invention) for wholeBulk noise and the linearity, at RF input, adopt single-stage to realize the circuit structure of low noise amplification and LC filtering. And in one-levelRealize single-ended transfer difference simultaneously, Broadband Matching, narrow-band filtering reaches low-down noise coefficient and extraordinary two rank lines simultaneouslyProperty degree performance; 2) in order to make impedance matching requirement as far as possible little on noiseproof feature impact, in the structure of single-ended transfer difference, realizedThe noise of difference is eliminated.
In sum, the present invention has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention. Any ripeThe personage who knows this technology all can, under spirit of the present invention and category, modify or change above-described embodiment. CauseThis, have in technical field under such as conventionally know the knowledgeable do not depart under disclosed spirit and technological thought completeAll equivalences that become are modified or change, and must be contained by claim of the present invention.
Claims (7)
1. a wideband low noise amplifier with single-ended transfer difference ability and filter action, is characterized in that, described broadbandLow-noise amplifier comprises: the first transconductance stage, the second transconductance stage, the 3rd transconductance stage, feedback network and the first load;
The first transconductance stage and the second transconductance stage, the first transconductance stage is in parallel with the second transconductance stage, the input of described the first transconductance stageBe connected with a voltage input end, the first output of the first transconductance stage is connected with the first input end of the 3rd transconductance stage, first acrossSecond output of leading level is connected with the second input of the 3rd transconductance stage; The input of the second transconductance stage and the input of described voltageEnd is connected, and the first output of the second transconductance stage is connected with the first output of described the 3rd transconductance stage, the of the second transconductance stageTwo outputs are connected with the second output of the 3rd transconductance stage; The first transconductance stage and the second transconductance stage are for input voltage;
Feedback network, the output of feedback network is connected with described voltage input end, the first input end of feedback network with described inThe second output of the first transconductance stage is connected, the first output phase of the second input of feedback network and described the first transconductance stageConnect; Described feedback network is used for converting the differential signal of described the first transconductance stage to single-ended signal, and feeds back to voltage inputEnd forms backfeed loop;
The 3rd transconductance stage, the first input end of the 3rd transconductance stage is connected with the first output of described the first transconductance stage, the 3rd acrossLead level the second input be connected with the second output of described the first transconductance stage, the first output of the 3rd transconductance stage and described inThe first output of the second transconductance stage is connected, the second output of the 3rd transconductance stage and the second output of described the second transconductance stageBe connected; Electric current and the second transconductance stage output of described the 3rd transconductance stage for the voltage transitions of described the first transconductance stage output is becomeElectric current superimposed;
The first load, one end of the first load is connected with the first output of described the 3rd transconductance stage, the other end of the first loadBe connected with the second output of described the 3rd transconductance stage; Described the first load is for generation of the differential voltage signal of arrowband.
2. the wideband low noise amplifier with single-ended transfer difference ability and filter action according to claim 1, its spyLevy and be: described feedback network comprises the second load, feedback resistance and feedback amplifier.
3. the wideband low noise amplifier with single-ended transfer difference ability and filter action according to claim 2, its spyLevy and be: one end of described feedback resistance is connected with described voltage input end, the other end of feedback resistance and described feedback are amplifiedThe output of device is connected.
4. the wideband low noise amplifier with single-ended transfer difference ability and filter action according to claim 2, its spyLevy and be: the first input end of described feedback amplifier is connected with one end of the second load, the second input of feedback amplifierBe connected with the other end of the second load.
5. the wideband low noise amplifier with single-ended transfer difference ability and filter action according to claim 2, its spyLevy and be: the voltage signal that described the first transconductance stage produces in the second load is through described feedback amplifier and described feedback electricityResistance feeds back to voltage input end.
6. the wideband low noise amplifier with single-ended transfer difference ability and filter action according to claim 5, its spyLevy and be: described the first load is passive narrow-band filtering circuit or the load circuit with change of frequency.
7. the wideband low noise amplifier with single-ended transfer difference ability and filter action according to claim 1, its spyLevy and be: the phase place that the noise of described the first transconductance stage output is exported by the 3rd transconductance stage, and by described feedback networkThe single spin-echo of exporting through the second transconductance stage again.
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| CN104158504B (en) * | 2014-08-19 | 2018-01-02 | 上海集成电路研发中心有限公司 | A kind of wideband low noise amplifier |
| US10110223B2 (en) * | 2016-07-06 | 2018-10-23 | Via Alliance Semiconductor Co., Ltd. | Single ended-to-differential converter |
| CN107666309B (en) * | 2017-11-27 | 2023-07-25 | 广东路得斯环境科技有限公司 | Improved single-ended differential signal circuit |
| CN111903119B (en) * | 2018-03-12 | 2022-05-24 | 华为技术有限公司 | Full-band receiver and television tuner |
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| CN103684274A (en) | 2014-03-26 |
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