CN102790595A - Single ended differential gain amplifier with configurable radio frequency broadband gain - Google Patents
Single ended differential gain amplifier with configurable radio frequency broadband gain Download PDFInfo
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- CN102790595A CN102790595A CN2011101767074A CN201110176707A CN102790595A CN 102790595 A CN102790595 A CN 102790595A CN 2011101767074 A CN2011101767074 A CN 2011101767074A CN 201110176707 A CN201110176707 A CN 201110176707A CN 102790595 A CN102790595 A CN 102790595A
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Abstract
The invention discloses a single ended differential gain amplifier with a configurable radio frequency broadband gain. The gain amplifier comprises a single ended differential circuit with a configurable gain, a broadband amplifying circuit with the configurable gain and a buffer driving circuit with the configurable gain which are sequentially connected in series. Gain control ends of the circuits are connected with a gain control signal from an outer digital base band processing module to form a gain value of the single ended differential gain amplifier with the configurable radio frequency broadband gain in combination, according to the control of each circuit at a set fixed step pitch, fine adjustment on the gain is implemented, thus a range of the broadband signal output by the differential conforms to a range value of a set signal, and strong disturbance is effectively restrained. Since the strong detection and processing capability of a digital processing module chip of the outer base band is good for a gain control mode, the gain control is enabled not to be affected from temperature, process, noise and the like, and more precise and flexible control can be realized. The control range of the gain is a summation of the maximum gain control ranges of the three circuits with the configurable gains, so that the gain amplifier is suitable for application of the high dynamic input with strong disturbance or weak signal, and is suitable for a radio frequency chip with multiple frequencies and multiple modes of a single ended broadband radio frequency signal input.
Description
Summary of the invention
The invention belongs to the technology for radio frequency field; Relate to a kind of single-ended transfer difference amplifying circuit; Relate in particular to a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains, be used for radio-frequency transmitter, it both can realize the amplification output of small-signal; Simultaneously can realize inhibition, to the amplification of input signal with to dwindle be to control through base-band digital processing module chip to high reject signal.
Summary of the invention
The objective of the invention is for solving the above problem that the traditional radio frequency receiver front end of prior art constitutes; A kind of configurable rf broadband gain amplifier is provided; Support simultaneously single-ended signal is transformed into differential signal, the radio-frequency transmitter and other that can be used for multifrequency need carry out in the receiver of processing and amplifying broadband signal.It removes the function of the gain amplifier that possesses traditional receiver, also has the function of controllable gain system, can better reduce hardware and system power expense, improves system signal noise ratio, optimization system design.
The present invention changes in above-mentioned two kinds of traditional structures can not the amplified broad band signal, can not realize the output of single-ended signal input differential signal, need add single-ended transfer difference device and the too narrow shortcoming of Gain Adjustable scope; Make this radio frequency chip can realize the great dynamic range broadband rf signal is amplified, saved outer member, reduced circuit overhead and power consumption; The performance of raising system; And the sensitivity of radio-frequency transmitter etc., can also reduce equipment power dissipation and volume thus, practice thrift cost.A kind of single-ended transfer difference of the present invention configurable rf broadband gain amplifier that gains applicable to the radio frequency chip in multifrequency broadband, is particularly suitable for needing to reduce external devices, increases the workplace of the dynamic range of input signal.
Above-mentioned purpose of the present invention is to realize through following technical scheme:
A kind of single-ended transfer difference configurable rf broadband gain amplifier that gains, its circuit constitute and comprise the configurable single-ended transfer difference circuit of gain, and configurable wideband amplification circuit and the configurable buffering drive circuit of gain gain; The input of configurable single-ended transfer difference circuit of gaining inserts the broadband rf signal of radio-frequency front-end output; Its output connects the input of the configurable wideband amplification circuit of gain; The difference output end of configurable wideband amplification circuit of gaining connects the differential input end of the configurable buffering drive circuit of gain, and the difference output end of the configurable buffering drive circuit that gains is with the differential signal output of amplifying;
The configurable single-ended transfer difference circuit of described gain; The gain configurable wideband amplification circuit and the configurable buffering drive circuit that gains all has gain control end; The gain control end of above-mentioned each circuit all connects outside gain control signal; Outside gain control signal through different gain control signal values, is controlled the gain of above-mentioned each circuit from the digital baseband process chip.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is: a described configurable single-ended transfer difference circuit of gain; A configurable wideband amplification circuit of gain and the configurable buffering drive circuit of gain are integrated in configurable gain module; The composition of configurable gain module comprises single-ended broadband signal input, the broadband signal output of difference and the gain control signal end that connects outside gain control signal; Circuit structure makes the peripheral structure device reduce, and better reduces hardware cost, helps improving system signal noise ratio.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains, it is: the configurable single-ended transfer difference circuit of said gain comprises that several single-ended transfer difference amplifying circuits and several output control switch are right; Wherein
Said several single-ended transfer difference amplifying circuits are for being connected in parallel single-ended radio frequency input signal V
INThe input that connects all single-ended transfer difference amplifying circuits simultaneously; Each single-ended transfer difference amplifying circuit difference output end of several single-ended transfer difference amplifying circuits is connected in parallel to constituting difference output end of the same name through the control switch of series connection; Be used to realize that several single-ended transfer difference amplifying circuits transfer single-ended input signal to the differential output signal of controllable gain;
Said several output control switch are right, are connected in series in separately on the difference output end of corresponding in several a single-ended transfer difference amplifying circuits single-ended transfer difference amplifying circuit; Several output control switch are controlled the access number of several single-ended transfer difference amplifying circuits to the control of the gain control signal that receives digital baseband processing module chip; The yield value of the configurable single-ended transfer difference circuit of number decision gain of the single-ended transfer difference amplifying circuit that inserts is in order to realize the gain coarse adjustment.
The configurable single-ended transfer difference circuit of said gain is made up of a plurality of identical single-ended transfer difference amplifying circuits; The output of each single-ended transfer difference amplifying circuit is for selecting link; Through the gain amplification module number of control connection input, realize the gain controlling of the configurable single-ended transfer difference circuit of gain.
The configurable wideband amplification circuit of said gain is the size that how can change gain through the load that changes place in circuit.
The configurable buffering drive circuit of said gain is many input pipes parallel circuits structure, can pass through the gain controlling switch, and gain control signal is through changing the size that input pipe parallel connection number changes its gain.The gain gain stepping of configurable rf broadband gain amplifier of single-ended transfer difference is more greatly the single-ended transfer difference gain coarse adjustment in the configurable rf broadband gain amplifier that gains.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is: the configurable wideband amplification circuit of said gain comprises that an input amplifies differential pair circuit itself and a pair of configurable laod network and a configurable negative feedback resistor, and a control switch group that realizes configuration; Configurable negative feedback resistor is connected in the source electrode that differential pair tube is amplified in input, and the control end of control switch group connects the outside gain control signal end of base-band digital processing module chip; Be used for that configuration realizes the secondary stepping configuration to the configurable wideband amplification circuit gain that gains with switch control negative feedback resistor through switch control load networking configuration, and realization is to the gain gain fine tuning of configurable rf broadband gain amplifier of single-ended transfer difference.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains, it is: said a pair of configurable load networking and a configurable negative feedback resistor are secondary control switch group circuit structure, wherein:
A pair of configurable load networking separately is connected on the drain electrode that differential pair tube is amplified in input, and a pair of configurable load networking connects first order control switch group, the gain stepping configuration of the step pitches such as the first order of the configurable wideband amplification circuit that is used to realize to gain;
A configurable negative feedback resistor connects second level control switch group, the gain stepping configuration of the step pitches such as the second level of the configurable wideband amplification circuit that is used to realize to gain,
The stride value of step pitches such as the said second level is 2 times of stride value of step pitch such as the first order, is used to realize the gain secondary fine tuning of configurable rf broadband gain amplifier gain of single-ended transfer difference.
Through outside gain control signal input is adjusted in the control of control switch group and amplified the resistance sizes at differential pair load networking and the size of source negative feedback resistance; Realize the gain stepping configuration of the configurable wideband amplification circuit of gain; The stride value of gain stepping of configurable wideband amplification circuit of gaining is a fixed value; Less than the single-ended transfer difference configurable rf broadband gain amplifier that gains, realize the single-ended transfer difference thin tuning in the configurable rf broadband gain amplifier that gains.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is: the configurable buffering drive circuit of said gain is many input pipes of two-way parallel circuits structure of difference; Every road circuit is formed and is comprised a fixing output buffering drive circuit and two may command input buffering drive circuits, and the input series connection of each may command input buffering drive circuit inserts a control switch; The control end of control switch connects the control signal end of base-band digital processing module chip; Be used to accept the control signal of base-band digital processing module chip; Through break-make control to control switch; Realization is to the stepping configuration of the configurable buffering drive circuit gain that gains, and realizes the gain gain accurate adjustment of configurable rf broadband gain amplifier of single-ended transfer difference; Configurable buffering drive circuit difference output connects outside base-band digital processing module radio circuit, is used for driving and isolating the next stage radio circuit.
The gain of configurable buffering drive circuit of gaining is the size that changes gain through the number that changes may command input buffering drive circuit; Base-band digital processing module chip is controlled the number of its input pipe through control switch; Realization is to the configurable buffering drive circuit gain configuration that gains; Gain the gain step value of configurable buffering drive circuit less than the gain step value of the configurable wideband amplification circuit of gain, realize the gain accurate adjustment joint of configurable rf broadband gain amplifier of single-ended transfer difference.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is: the gain control end of the configurable single-ended transfer difference circuit of said gain, the configurable wideband amplification circuit of gain and the configurable buffering drive circuit that gains is connected outside gain control signal output respectively, is used to control above-mentioned three gain configurable circuits input signal is separately realized undistorted amplification and gain adjustment; The gain adjustment of above-mentioned each gain configurable circuit is all under gain control signal control, with fixedly step pitch enforcement step gain adjustment separately; Said gain control signal is from the base-band digital processing module chip of outside.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is: each independent single-ended transfer difference amplifying circuit of the configurable single-ended transfer difference circuit of said gain is the cascode amplifier structure; The two-way load of the single-ended transfer difference amplifying circuit that each is independent is variable-resistance LR load networking, and the variable resistor at load networking is configurable structure; Be used to regulate amplification quantity, realize that the signal amplitude and the phase place of each single-ended transfer difference amplifying circuit two-way difference output end in the configurable single-ended transfer difference circuit of gain is consistent.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is: the said single-ended transfer difference configurable gain stepping configuration groups for the configurable single-ended transfer difference circuit of gain, the configurable wideband amplification circuit of gain and the configurable buffering drive circuit that gains that are connected in series successively of the gain of configurable rf broadband gain amplifier that gains is closed formation; Its gain control range is the maximum gain control range sum of above-mentioned three gain configurable circuits, and its gain control value carries out regulating and controlling by outside baseband processing module to the gain control signal that input signal detection generates; Be used to control the single-ended transfer difference configurable rf broadband gain amplifier stepping step by step that gains that gains and accurately adjust, realize that difference output broadband signal amplitude meets the setting signal range value, effectively suppresses strong jamming.
The gain gain controlling of configurable rf broadband gain amplifier of single-ended transfer difference can be regulated according to the signal of input, specifically is to detect the output signal magnitude by the external detection unit; If the strong jamming input is arranged; Signal strength signal intensity surpasses set point, and at this moment system can require the Gain Adjustable part of FEEDBACK CONTROL single-ended transfer difference circuit according to configured in one piece, regulates gain and reduces; If weak signal input; Signal strength signal intensity is lower than set point, and at this moment system can require the Gain Adjustable part of FEEDBACK CONTROL single-ended transfer difference circuit according to configured in one piece, and regulating gain increases; Set requirement if the size of input signal satisfies, at this moment system can require the Gain Adjustable fractionated gain of FEEDBACK CONTROL single-ended transfer difference circuit not change according to configured in one piece.Not only can amplifying signal, when high reject signal was imported, the gain that base-band digital processing module chip can be controlled above circuit realized that the dwindling of high reject signal had inhibitory action to high reject signal.
Described a kind of single-ended transfer difference configurable rf broadband gain amplifier that gains; It is characterized in that: the configurable single-ended transfer difference circuit of said gain, the configurable wideband amplification circuit of gain and the configurable buffering drive circuit that gains are the circuit of wideband structural; Said wideband structural comprises source class negative feedback structure and inductance resonance structure; Realize improving signal bandwidth by device architecture and employing 0.18 μ m CMOS integrated technique, be used for undistorted amplification the input broadband signal.
Because market requires increasingly high to the bandwidth and the input range of input signal now; Simultaneously stable output voltage to be arranged,, improve the stability of a system in order to reduce circuit complexity; Introduce the configurable single-ended transfer difference circuit of gain; The configurable wideband amplification circuit that gains is satisfying under the broadband signal input prerequisite, has improved the dynamic range of system greatly.Use the signal of base-band digital processing module chip detection output; Make full use of the powerful disposal ability of its DSP; Accomplish complicated more nonlinear algorithm, make gain controlling not receive the influence of temperature, technology, noise etc., make control more flexible through programming; Realize needed characteristic easily, realize more accurate gain control.A kind of single-ended transfer difference of the present invention configurable rf broadband gain amplifier that gains; Transfer single-ended wideband input signal to broadband differential signals, noise factor is very low when inserting simultaneously, and according to the size of base-band digital processing module chip signal output; Cooperate and change the gain configuration mode; Through the combination stepping of the big step pitch that gains, middle step pitch, small step distance, realize thick, thin, the accurate adjustment joint of gain, obtain the controlled adjustment of great dynamic range; Make and reach the effect of amplifying weak signal and suppressing strong signal and high reject signal by the output signal that the extremely wide input signal of dynamic range can both be stable.
Now market is in the chip miniaturization; Integrated level has proposed increasingly high requirement; The gain integration module of configurable rf broadband gain amplifier of a kind of single-ended transfer difference of the present invention can adapt to the requirement of chip miniaturization high integration, has saved a large amount of areas; The peripheral components of system is reached minimize, at utmost reduced system cost.
Substantial effect of the present invention:
1, the single-ended transfer difference of the present invention configurable rf broadband gain amplifier that gains is fit to be applied to the high dynamically input requirement of strong jamming or weak signal.
2, the present invention has the function that single-ended signal is transferred to differential signal, and circuit structure makes the peripheral structure device reduce, and can better reduce hardware and system cost expense, helps the optimization and improvement system signal noise ratio.
3, the configurable buffering drive circuit driving force of gain of circuit adding of the present invention is strong, can the fine driving requirement of satisfying late-class circuit.
4, the gain gain digital control model of configurable rf broadband gain amplifier of single-ended transfer difference of the present invention has benefited from powerful detection and the disposal ability of outside base-band digital processing module chip; Make gain controlling not receive the influence of temperature, technology, noise etc., can realize more accurately control more flexibly.
5, the single-ended transfer difference of the present invention configurable rf broadband gain amplifier that gains can adapt to broadband signal input, can be applied to multiple radio frequency input occasion, especially is fit to the multifrequency receiver that the cooperation needs receive different-waveband simultaneously.
Background technology
Along with the continuous appearance of areas of information technology new technology and the continuous progress of technology, the radio-frequency front-end of various receiver systems and base-band digital processing module chip have all been obtained bigger development in recent years.Maturation day by day with chip research and development of fixing little gain or big gain; But because of its function singleness; So people turn to attentiveness the research and development with dynamically high and high bandwidth chip; Comprise the research and development of the multifunction chip of supporting a plurality of working frequency range and the multifunction chip of supporting the inhibition interference signal, can satisfy the increasingly high demand in technology for radio frequency field.
As everyone knows, signal in the different communication systems uses signal in band inequality, and the rf gain amplifier of the radio-frequency front-end of existing traditional receiver system is generally the narrow-band reception pattern, can only receive a kind of signal of signal in band wherein.Simultaneously, all be single-ended input for present most of communication system radiofrequency signals, all to need signal be differential signal and chip internal is in order to suppress common-mode signal, so generally need outside sheet, add extra single-ended transfer difference balun circuit.Simultaneously, disturb general ten minutes serious between the now different communication systems, general communication chip all can not the cope well interference signal.Based on above analysis, the defective of existing RF receiving circuit has seriously limited it and has used, and has increased many extra peripheral circuits.
There are many shortcomings in prior art rf gain amplifier: the first, and the radio frequency amplifier of traditional structure all is fixed gain, is not suitable for being applied to the high dynamically input requirement of strong jamming or weak signal.The second, the radio frequency amplifier of traditional structure all is to work in the arrowband environment, can not satisfy the occasion that the different-waveband signal is imported simultaneously.The 3rd; The radio frequency amplifier of traditional structure all can not change single-ended signal into difference channel; Need single-ended Ba Lun parts that transfer differential signal to of the extra increase of chip exterior, so both increased the cost of overall plan, also increased the chip pin of input and output simultaneously; Reduce the stability of signal, increased the difficulty of global design.The 4th, there is the limitation defective in the output buffer driving force.
If being arranged, a kind of configurable rf broadband gain amplifier can support the single-ended transfer difference function; And can be as required by its gain size of base-band digital processing module chip controls; To cooperate the application of different input sizes or strong jamming input; Not only make the flexibility of whole radio-frequency front-end improve greatly, and better adapt to the ever-increasing market demand of areas of information technology new technology.
Description of drawings
Fig. 1 is the configurable radio-frequency amplifier circuit theory diagram of the gain of prior art;
Among the figure: 101-decides gain amplifier.
Fig. 2 is the configurable buffer circuit theory diagram of the gain of prior art;
Among the figure: the output buffer that 201-is fixing, the output buffer that the control of 202-switch inserts.
Fig. 3 a is that gain configurable rf broadband gain amplifier of single-ended transfer difference of the present invention constitutes block diagram;
Among Fig. 3 a: the configurable single-ended transfer difference circuit of 31-, the 32-configurable wideband amplification circuit that gains, the 33-configurable buffering drive circuit that gains, V
IN-single-ended input signal, V
OUTPAnd V
OUTN-differential output signal, V
Ctl-gain control signal.
Fig. 3 b is the single-ended transfer difference of Fig. 3 a embodiment of the invention configurable rf broadband gain amplifier circuit structured flowchart that gains;
Among Fig. 3 b: the gain gain controlling switch of configurable single-ended transfer difference circuit of 311～314-single-ended transfer difference amplifying circuit, 1～single-ended transfer difference amplifying circuit n, 315～318-.
Fig. 4 for the single-ended transfer difference of the embodiment of the invention gain configurable rf broadband gain amplifier and outside digital baseband processing module chip be connected block diagram;
Among Fig. 4: the 41-single-ended transfer difference configurable rf broadband gain amplifier that gains, 42-digital baseband processing module.
Fig. 5 is the single-ended transfer difference amplifying circuit schematic diagram of the configurable single-ended transfer difference circuit of the gain of the embodiment of the invention;
Among Fig. 5: M1, M2-import amplifier tube, M3, M4-tail current pipe, and R1, R2-biasing resistor, R3,, R4-variable load resistance, C1, C2-capacitance, L1, L2-load inductance, Bias1, Bias2-offset signal.
Fig. 6 is for adopting the configurable wideband amplification circuit principle of compositionality of the gain figure of the embodiment of the invention; Among Fig. 6: the 6-configurable wideband amplification circuit that gains; M5, M6-are respectively the positive negative output amplifier tube of input signal, M7, and M8-is respectively M5, the tail current pipe of M6; R5, R6-is respectively M5, the biasing resistor of M6, R7; R8-is respectively M5, the variable load resistance of M6 pipe, R9-source negative feedback variable resistor, C3; C4-is respectively M5, the capacitance of M6, L3, L4-load inductance.
The configurable buffering drive circuit figure of gain that Fig. 7 adopts for the embodiment of the invention;
Among Fig. 7: the 7-configurable buffering drive circuit that gains; The 71-P configurable buffering drive circuit that gains on the road, the 72-N configurable buffering drive circuit that gains on the road; M7-is the amplifier transistor of output buffer fixedly, and M8 and M9-control insert the amplifier transistor of output buffer, M10-tail current pipe, and R10, R11 and R12-biasing resistor, SW1, the SW2-control switch, C5-imports capacitance.
The single-ended transfer difference that Fig. 8 is 63dB for a gain controlling dynamic range of the embodiment of the invention configurable rf broadband gain amplifier circuit schematic diagram that gains;
Among Fig. 8: the 8-single-ended transfer difference configurable rf broadband gain amplifier that gains; The 81-configurable single-ended transfer difference circuit that gains; 811-single-ended transfer difference circuit 1,812-single-ended transfer difference circuit 2,813-single-ended transfer difference circuit 3,814-single-ended transfer difference circuit 4; The 815-818-control switch is right; The 6-configurable wideband amplification circuit that gains; The 7-configurable buffering drive circuit that gains; The 71-P configurable buffering drive circuit that gains on the road, the 72-N configurable buffering drive circuit that gains on the road.
The configurable radio frequency amplifier of the gain of prior art is as shown in Figure 1.11 is fixed gain amplifier, and RF1 and RF2 are the resistance of variable resistance, switch SW 1, and SW2, the multiple combination of SW3 and SW4 folding, the plurality of access modes of controlling resistance R11～R16 realizes that the gain of radio frequency amplifier is configurable.
Fig. 2 is the configurable buffer circuit of the gain of prior art.201 are fixing output buffer; 202 are switch control access output buffer; M1 and M2 are respectively the amplifier transistor of fixing output and control access output buffer; Switch SW 1 control inserts output buffer, and it is one-level that switch control inserts output buffer 202, and there is the limitation defective in the output buffer driving force.
The schematic block circuit diagram of traditional configurable radio frequency amplifier of gain is as shown in Figure 1; The configurable radio frequency amplifier that gains is made up of resistance adjustable network and Gain Adjustable radio frequency amplifier; Input signal is at first being exported through adjustable amplification radio frequency amplifier through resistor network; The resistance adjustable network can obtain different resistance values through configuration; Different resistance values can make the input signal that passes through obtain the decay of different gains; Perhaps select direct unattenuated pass-through mode, through the signal radio frequency amplifier amplification of process Gain Adjustable again of resistance adjustable network, the Gain Adjustable radio frequency amplifier can change the yield value of radio frequency amplifier through the value that changes feedback resistance RF1 and RF2.
The configurable drive circuit of traditional gain is as shown in Figure 2; The penetrate grade follower output of radiofrequency signal through forming by transistor M1 and current source Is1; Whether switch SW 1 selects M2 to work, when SW1 selects M2, and the M2 operate as normal; Input signal joins in the output via grade follower of penetrating that transistor M2 and current source Is2 form, and realizes that the gain of drive circuit changes.
Embodiment
Through embodiment and combine accompanying drawing, technical scheme of the present invention is further specified below.
First embodiment
The gain circuit of configurable rf broadband gain amplifier of the single-ended transfer difference that Fig. 3 has provided the embodiment of the invention constitutes block diagram.Explain that in conjunction with Fig. 3 the configurable structure of gain realizes constituting among the present invention: input signal V
INGet into the single-ended input of the configurable single-ended transfer difference circuit 31 of gain; The configurable single-ended transfer difference circuit 31 that gains is connected in parallel by single-ended transfer difference amplifying circuit 311～314; Single-ended transfer difference amplifying circuit 311～314 is realized input signal by the single-ended differential signal that transfers to jointly; Switch 315～418 control variable gain stages 311～314 insert, and differential output signal passes through control switch to 35～318, the input of the configurable wideband amplification circuit 32 of insertion gain; Gain configurable wideband amplification circuit output again through the gain configurable buffering drive circuit 33, by the gain configurable buffering drive circuit export to late-class circuit.
Second embodiment
A kind of single-ended transfer difference that Fig. 4 has provided application implementation of the present invention example configurable rf broadband gain amplifier that gains is connected block diagram with the circuit of base-band digital processing module chip controls signal.Baseband chip provides three groups of control words control single-ended transfer differences configurable rf broadband gain amplifier circuit that gains; Be respectively Vctl1; Vctl2 and Vctl3; Vctl1 ride gain may command single-ended transfer difference circuit 31, the configurable wideband circuit 32 of Vctl2 ride gain, the configurable buffering drive circuit 33 of Vctl3 ride gain.
The gain differential output signal of configurable rf broadband gain amplifier 41 of single-ended transfer difference; Difference output end via the configurable buffering drive circuit 33 of gain is delivered to outside base-band digital processing module 42, and the base-band digital processing module detects the size of the differential output signal of the configurable buffering drive circuit 33 of gain.When base-band digital processing module chip detection to the signal value of sending here during less than the setting signal value; Vctl1 at first transmits control signal; The configurable buffering drive circuit 33 of ride gain increases the yield value of the configurable buffering drive circuit 33 of gain with step value 0.5dB; After the gain of the configurable single-ended transfer difference rf broadband gain amplifier 41 of adjustment gain, base-band digital processing module chip continues to detect input differential output signal value, if still less than the setting signal value; The configurable buffering drive circuit 33 of ride gain increases yield value with step value 0.5dB once more; Equal the setting signal value up to input differential output signal value, stop to transmit control signal to the configurable buffering drive circuit 33 of gain, adjustment process stops.If the final output signal value that base-band digital processing module chip detection arrives is still still less than the setting signal value; Then base-band digital processing module chip sends gain control signal control signal Vctl2 to the configurable wideband amplification circuit 32 of gain; Change the resistance of its load resistance R7 and R8; Increase the output gain of the configurable wideband amplification circuit 32 of gain with the 2dB step value; In like manner, if up to adjustment back base-band digital processing module chip detection to the input signal size equal the setting signal value, adjustment process stops.If its input signal values that base-band digital processing module chip detection arrives is still less than the setting signal value; Then base-band digital processing module chip continues the Vctl2 that transmits control signal; Change the resistance of the source negative feedback resistance R 9 of the configurable wideband amplification circuit 32 of gain; Gain will increase with the 4dB step value, if adjustment back base-band digital processing module chip detection to the final output signal size equal the setting signal value, adjustment process stops.If the final output signal value that base-band digital processing module chip detection arrives is still less than the setting signal value; Then base-band digital processing module chip sends gain control signal Vctl3, delivers to the configurable single-ended transfer difference circuit of gain, changes the load resistance of each single-ended transfer difference amplifying circuit; Step value with 8dB increases gain; In like manner, if up to adjustment back base-band digital processing module chip detection to the final output signal value equal the setting signal value, adjustment process stops.If the final output signal that base-band digital processing module chip detection arrives size is still less than set point; Then base-band digital processing module chip continues to send gain control signal Vctl3; Make the connection of a control switch in the control switch 416～418; Progressively control the number that the single-ended transfer difference amplifying circuit inserts output, make the configurable single-ended transfer difference circuit 31 of gain increase gain, reach optimum value up to the gain configuration with the 16dB step value.
If the output signal value of the rf broadband gain amplifier 41 that base-band digital processing module chip detection arrives or title total output signal value are greater than the setting signal value; So; Base-band digital processing module chip continues to send the gain control signal of reverse control; Successively decreasing according to gain, stride value is descending oppositely controls the gain gain adjustment of configurable rf broadband gain amplifier 41 of single-ended transfer difference one by one; Up to the gain output signal value of configurable rf broadband gain amplifier 41 of single-ended transfer difference is optimum value, and the permission gain deviation of optimum value and setting signal value is 0.5dB.
The gain gain adjustment range of configurable rf broadband gain amplifier 41 of single-ended transfer difference; The maximum dynamic range that is gain controlling is for (the accurate adjustment step pitch is dB a)+(fine tuning step pitch b+ fine tuning step pitch c)+(coarse adjustment step pitch d+ coarse adjustment step pitch e)=(0.5a)+(2.0b+4.0c)+(8.0d+16e), and a, b, c, d, e are design load.In the formula: a is the number of configurable buffering drive circuit; B is the change resistance number of times of the configurable wideband amplification circuit load resistance of gain; C is the change resistance number of times of the configurable wideband amplification circuit negative feedback resistor of gain; D is the change resistance number of times of single-ended transfer difference amplifying circuit load resistance, and e is the number of single-ended transfer difference amplifying circuit.
The 3rd embodiment
Fig. 5～7 provide the configurable single-ended transfer difference amplifying circuit of gain of the embodiment of the invention, the schematic diagram of the gain configurable wideband amplification circuit and the configurable buffering drive circuit that gains.
Provide single-ended transfer difference amplifying circuit schematic diagram in the configurable single-ended transfer difference circuit of gain among Fig. 5, the single-ended transfer difference amplifying circuit is the adjustable cascode amplifier structure of amplification quantity, input signal V
INBe input to input amplifier tube M1, M2 respectively through capacitance C1, C2; Input amplifier tube M1 and the amplitude of M2 with identical amplification quantity amplification input signal; And with opposite phases adjustment phase of input signals, at input amplifier tube M1, the L1 of M2 and the difference output end V of R3 shunt load, L2 and R4 shunt load
OUTNAnd V
OUTP, the difference amplified output signals that the amplitude that obtains is identical, phase place is opposite.The amplification quantity of single-ended transfer difference amplifying circuit is adjustable, can realize the adjustment of differential signal output amplitude size through the size that changes variable load resistance R 3 and R4.It is right that the difference output end of each single-ended transfer difference amplifying circuit connects a control switch; Control switch is to receiving the control of gain control signal; Control switch is during to closure; The controlled access of the difference output end of this single-ended transfer difference amplifying circuit is the gain realization stepping increase of the configurable single-ended transfer difference circuit that gains.Offset signal Vbias1 and Vbias2 are respectively from voltage that bias voltage circuit produced.
Provided the configurable wideband amplification circuit structure of gain among Fig. 6, input signal V
INN2, V
INP2 is input to input amplifier tube M5, M6 respectively through capacitance C3, C4, and transistor M5 and M6 are with identical big or small amplification input signal, at the output V of shunt load L3 and R7, shunt load L4 and R8
OUTN2 and V
OUTThe differential signal that P2 obtains amplifying.The size that changes load resistance R7 and R8 or source negative feedback resistance R 9 can change differential signal output amplitude size.Receive the control of the gain control signal Vctl2 of base-band digital processing module chip transmission; Can control the variable resistor R8 value of shunt load of variable resistor R7, the M6 of the shunt load of two-stage input amplifier M5, with the step gain of the 2.0dB yield value apart from the configurable wideband amplification circuit of adjustment gain, each output gain increases 2.0dB earlier; Repeatedly fine control; It is 2.0～6.0dB that output gain increases adjusting range, then, receives the control of the gain control signal Vctl2 of base-band digital processing module chip transmission; The size of adjustment source negative feedback resistance R 9, thus participate in realizing the configurable fine tuning of gain to the configurable rf broadband gain amplifier of differential gain.The configurable wideband amplification circuit that gains adopts big resistance R 5, R6 and inductance L 3, and L4 parallel connection output loading utilizes resistance to increase the resonant bandwidth that is produced by the inductance spike, improves the resonance frequency of signal, obtains the bandwidth amplification performance.Gaining configurable is at first to pass through to change load resistance R5 and R6, and it is the gain-adjusted ability of 2dB that stepping is provided, and can gain through changing source class negative feedback resistor R9, changing afterwards, and it is the gain-adjusted ability of 4dB that stepping is provided.
Fig. 7 has provided the configurable buffering drive circuit schematic diagram of gain of single channel; Gain on the road circuit structure of configurable buffering drive circuit 51 of P comprises the buffering drive circuit 501 of one-level fixed gain and the buffering drive circuit 502 and 503 of the controlled access of two-stage, input signal V
INP3 is linked into input amplifier tube M7, M8 through capacitance C5; M9, input amplifier tube M7, M8; The operating current of M9 is provided by tail current pipe M10; Input amplifier tube M7, the output of M8 and M9 is connected in parallel and is in the same place, and forming the output signal end in P road is that slip divides gain configurable rf broadband gain amplifier output signal end V
OUTP3.The controlled access of two-stage buffering drive circuit 502 respectively be connected a control switch SW1 and SW2 with 503 signal input part; Switch SW 1 and SW2 receive the control of the gain control signal Vctl3 of base-band digital processing module chip transmission; Can control the buffering drive circuit 502 of the controlled access of two-stage and 503 access; Apart from the yield value that changes the configurable buffering drive circuit of gain, insert the first-level buffer drive circuit with the step gain of 0.5dB, output gain increases 0.5dB; Insert the two-stage buffering drive circuit; Output gain increases 1.0dB, and its adjusting range is 0～1.0dB, thereby participates in realizing the configurable meticulous adjustment of the gain of the configurable rf broadband gain amplifier of differential gain.Gain on the road circuit structure and the P road of configurable buffering drive circuit 52 of N is identical, and the input signal end on N road is V
INN3, the output signal end on N road are that slip divides gain configurable rf broadband gain amplifier output signal end V
OUTN3.The P road is identical with the amplitude output signal on N road, and phase place is opposite.Configurable buffering drive circuit output connects outside next stage radio circuit, drives and isolation next stage radio circuit.
The gain of configurable buffering drive circuit of gaining is the size that changes gain through the number that changes may command input buffering drive circuit; Base-band digital processing module chip is controlled the number of its input pipe through control switch; Realization is to the configurable buffering drive circuit gain configuration that gains; Gain the gain stepping of configurable buffering drive circuit less than the configurable wideband amplification circuit of gain, realize the single-ended transfer difference thin tuning in the configurable rf broadband gain amplifier that gains.
The 4th embodiment
Fig. 8 is the gain circuit theory diagrams of configurable rf broadband gain amplifier of single-ended transfer difference that a gain controlling dynamic range is 63dB.The single-ended transfer difference configurable rf broadband gain amplifier 8 that gains is made up of the configurable single-ended transfer difference circuit of gain 81, the configurable wideband amplification circuit 6 of gain and the configurable buffering drive circuit 7 that gains.Present embodiment is set: a is 2, b is 1, c is 1, d is 1, e is 3; The configurable buffering drive circuit 7 that promptly gains comprises P road configurable buffering drive circuit 71 and the N road configurable buffering drive circuit 72 that gains that gains; The configurable buffering drive circuit of the gain on P road and N road is identical, and every road comprises that all the number a of a fixing buffering drive circuit and configurable buffering drive circuit is 2.The variable resistance number of times b of load resistance of configurable wideband amplification circuit 6 of gaining is 1, and the change resistance number of times c of the negative feedback resistor of the configurable wideband amplification circuit 6 that gains is 1.The configurable single-ended transfer difference circuit 81 that gains comprises 4 identical single-ended transfer difference amplifying circuits 811～814, and it becomes resistance number of times d and is 1.Control switch of two difference output end serial connections of single-ended transfer difference amplifying circuit 811～814 is to 815～818.Single-ended transfer difference amplifying circuit 811 is fixed gain single-ended transfer difference circuit, and its control switch is normally closed to 815, and 812～814 is 3 configurable single-ended transfer difference amplifying circuits of gain, and the number e of the configurable single-ended transfer difference amplifying circuit that gains is 3.The two-way parallel connection difference output end of 4 single-ended transfer difference amplifying circuits 811～814 connects the two-way differential input end of the configurable wideband amplification circuit 6 of gain; Gain on the road output V of configurable buffering drive circuit 71 of the P road that the two-way difference output end of configurable wideband amplification circuit 6 of gaining connects the configurable buffering drive circuit of gain the gain input of configurable buffering drive circuit 72 of configurable buffering drive circuit 71 and N road that gains, P
OUTThe output V of configurable buffering drive circuit 72 gains for P and N road
OUTN connects the signal input part of outside baseband signal processing module 42 separately.The outside baseband signal processing module 42 detection of dynamic single-ended transfer differences configurable rf broadband gain amplifier 8 that gains is delivered to the signal amplitude of its signal input part; Make comparisons with the signal amplitude value of setting; And make NONLINEAR CALCULATION, dynamically generate three road gain control signal V
Ctl1, V
Ctl2, V
Ctl3, with the control word mode gain control signal of three way words is distributed to single-ended transfer difference the gain configurable buffering drive circuit of the gain of configurable rf broadband gain amplifier 87, the configurable wideband amplification circuit 6 of gain and the configurable single-ended transfer difference circuit 81 that gains.
The single-ended transfer difference configurable rf broadband gain amplifier 8 gain controlling dynamic ranges that gain are 0.5～63dB, and it is 0.5dB that gain controlling is dynamically adjusted precision.
The base-band digital processing module is through sending the gain control signal of control word; The gain configurable single-ended transfer difference circuit of gain of configurable rf broadband gain amplifier of control single-ended transfer difference; The gain controlling dynamic range of the configurable wideband amplification circuit and the configurable buffering drive circuit that gains of gaining is total up to 63dB, makes that dynamically input signal can both obtain stable optimum output signals greatly.
It will be understood by those skilled in the art that and under the prerequisite that does not deviate from broad scope of the present invention, the foregoing description is made some changes.Thereby the present invention is not limited in disclosed specific embodiment.Its scope should contain core of the present invention and the interior all changes of protection range that appended claims limits.
Claims (10)
1. a single-ended transfer difference configurable rf broadband gain amplifier that gains, its circuit constitute and comprise the configurable single-ended transfer difference circuit of gain of series connection successively, and configurable wideband amplification circuit and the configurable buffering drive circuit of gain gain; The input of configurable single-ended transfer difference circuit of gaining inserts the broadband rf signal of radio-frequency front-end output; Its output connects the input of the configurable wideband amplification circuit of gain; The difference output end of configurable wideband amplification circuit of gaining connects the differential input end of the configurable buffering drive circuit of gain, and the difference output end of the configurable buffering drive circuit that gains is with the differential signal output of amplifying;
The configurable single-ended transfer difference circuit of described gain; The gain configurable wideband amplification circuit and the configurable buffering drive circuit that gains all has gain control end; The gain control end of above-mentioned each circuit all connects outside gain control signal; Outside gain control signal through different gain control signal values, is controlled the gain of above-mentioned each circuit from the digital baseband process chip.
2. a kind of single-ended transfer difference according to claim 1 configurable rf broadband gain amplifier that gains; It is characterized in that: a described configurable single-ended transfer difference circuit of gain; A configurable wideband amplification circuit of gain and the configurable buffering drive circuit of gain are integrated in configurable gain module; The composition of configurable gain module comprises single-ended broadband signal input, the broadband signal output of difference and the gain control signal end that connects outside gain control signal.
3. a kind of single-ended transfer difference according to claim 1 and 2 configurable rf broadband gain amplifier that gains is characterized in that: the configurable single-ended transfer difference circuit of said gain comprises that several single-ended transfer difference amplifying circuits and several output control switch are right; Wherein
Said several single-ended transfer difference amplifying circuits are for being connected in parallel single-ended radio frequency input signal V
INThe input that connects all single-ended transfer difference amplifying circuits simultaneously; Each single-ended transfer difference amplifying circuit difference output end of several single-ended transfer difference amplifying circuits is connected in parallel to constituting difference output end of the same name through the control switch of series connection; Be used to realize that several single-ended transfer difference amplifying circuits transfer single-ended input signal to the differential output signal of controllable gain;
Said several output control switch are right, are connected in series in separately on the difference output end of corresponding in several a single-ended transfer difference amplifying circuits single-ended transfer difference amplifying circuit; Several output control switch are controlled the access number of several single-ended transfer difference amplifying circuits to the control of the gain control signal that receives digital baseband processing module chip; The yield value of the configurable single-ended transfer difference circuit of number decision gain of the single-ended transfer difference amplifying circuit that inserts is in order to realize the gain coarse adjustment.
4. a kind of single-ended transfer difference according to claim 1 and 2 configurable rf broadband gain amplifier that gains; It is characterized in that: the configurable wideband amplification circuit of said gain comprises that an input amplifies differential pair circuit itself and a pair of configurable laod network and a configurable negative feedback resistor, and a control switch group that realizes configuration; Configurable negative feedback resistor is connected in the source electrode that differential pair tube is amplified in input, and the control end of control switch group connects the outside gain control signal end of base-band digital processing module chip; Be used for that configuration realizes the secondary stepping configuration to the configurable wideband amplification circuit gain that gains with switch control negative feedback resistor through switch control load networking configuration, and realization is to the gain gain fine tuning of configurable rf broadband gain amplifier of single-ended transfer difference.
5. a kind of single-ended transfer difference according to claim 4 configurable rf broadband gain amplifier that gains, it is characterized in that: said a pair of configurable load networking and a configurable negative feedback resistor are secondary control switch group circuit structure, wherein:
A pair of configurable load networking separately is connected on the drain electrode that differential pair tube is amplified in input, and a pair of configurable load networking connects first order control switch group, the gain stepping configuration of the step pitches such as the first order of the configurable wideband amplification circuit that is used to realize to gain;
A configurable negative feedback resistor connects second level control switch group, the gain stepping configuration of the step pitches such as the second level of the configurable wideband amplification circuit that is used to realize to gain,
The stride value of step pitches such as the said second level is 2 times of stride value of step pitch such as the first order, is used to realize the gain secondary fine tuning of configurable rf broadband gain amplifier gain of single-ended transfer difference.
6. a kind of single-ended transfer difference according to claim 1 and 2 configurable rf broadband gain amplifier that gains; It is characterized in that: the configurable buffering drive circuit of said gain is many input pipes of two-way parallel circuits structure of difference; Every road circuit is formed and is comprised a fixing output buffering drive circuit and two may command input buffering drive circuits, and the input series connection of each may command input buffering drive circuit inserts a control switch; The control end of control switch connects the control signal end of base-band digital processing module chip; Be used to accept the control signal of base-band digital processing module chip; Through break-make control to control switch; Realization is to the stepping configuration of the configurable buffering drive circuit gain that gains, and realizes the gain gain accurate adjustment of configurable rf broadband gain amplifier of single-ended transfer difference; Configurable buffering drive circuit difference output connects outside base-band digital processing module radio circuit, is used for driving and isolating the next stage radio circuit.
7. a kind of single-ended transfer difference according to claim 1 and 2 configurable rf broadband gain amplifier that gains; It is characterized in that: the gain control end of the configurable single-ended transfer difference circuit of said gain, the configurable wideband amplification circuit of gain and the configurable buffering drive circuit that gains is connected outside gain control signal output respectively, is used to control above-mentioned three gain configurable circuits input signal is separately realized undistorted amplification and gain adjustment; The gain adjustment of above-mentioned each gain configurable circuit is all under gain control signal control, with fixedly step pitch enforcement step gain adjustment separately; Said gain control signal is from the base-band digital processing module chip of outside.
8. a kind of single-ended transfer difference according to claim 1 and 2 configurable rf broadband gain amplifier that gains; It is characterized in that: each independent single-ended transfer difference amplifying circuit of the configurable single-ended transfer difference circuit of said gain is the cascode amplifier structure; The two-way load of the single-ended transfer difference amplifying circuit that each is independent is variable-resistance LR load networking, and the variable resistor at load networking is configurable structure; Be used to regulate amplification quantity, realize that the signal amplitude and the phase place of each single-ended transfer difference amplifying circuit two-way difference output end in the configurable single-ended transfer difference circuit of gain is consistent.
9. according to the described a kind of single-ended transfer difference of the claim 1-8 configurable rf broadband gain amplifier that gains; It is characterized in that: the said single-ended transfer difference configurable gain stepping configuration groups for the configurable single-ended transfer difference circuit of gain, the configurable wideband amplification circuit of gain and the configurable buffering drive circuit that gains that are connected in series successively of the gain of configurable rf broadband gain amplifier that gains is closed formation; Its gain control range is the maximum gain control range sum of above-mentioned three gain configurable circuits, and its gain control value carries out regulating and controlling by outside baseband processing module to the gain control signal that input signal detection generates; Be used to control the single-ended transfer difference configurable rf broadband gain amplifier stepping step by step that gains that gains and accurately adjust, realize that difference output broadband signal amplitude meets the setting signal range value, effectively suppresses strong jamming.
10. according to the described a kind of single-ended transfer difference of the claim 1-8 configurable rf broadband gain amplifier that gains; It is characterized in that: the configurable single-ended transfer difference circuit of said gain, the configurable wideband amplification circuit of gain and the configurable buffering drive circuit that gains are the circuit of wideband structural; Said wideband structural comprises source class negative feedback structure and inductance resonance structure; Realize improving signal bandwidth by device architecture and employing 0.18 μ mCMOS integrated technique, be used for undistorted amplification the input broadband signal.
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