CN100550872C - communication system and method - Google Patents
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- CN100550872C CN100550872C CNB200610162580XA CN200610162580A CN100550872C CN 100550872 C CN100550872 C CN 100550872C CN B200610162580X A CNB200610162580X A CN B200610162580XA CN 200610162580 A CN200610162580 A CN 200610162580A CN 100550872 C CN100550872 C CN 100550872C
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Abstract
The invention provides a communication system and correlation technique.In communication system, frequency synthesizer synthesizes a tuning signal according to frequency division data and certain reference signal frequently, to be used for modulating signal to be transmitted.And when an amplifying circuit in the communication system of the present invention will carry out power amplification to this signal to be transmitted, communication system of the present invention just can be adjusted the equiva lent impedance of the appearance sense load slot circuit of amplifying circuit according to the value of these frequency division data, makes the passband of equiva lent impedance can meet the frequency range of signal to be transmitted in the frequency domain translation.In this way, communication system of the present invention can dynamically be adjusted the equiva lent impedance of holding the sense groove and be that different frequency scope in the broad frequency band is carried out impartial tuning amplification respectively.
Description
Technical field
The present invention relates to a kind of communication system and correlation technique, particularly relate to and a kind ofly can dynamically adjust equiva lent impedance is carried out impartial power amplification with the signal to the different frequency scope communication system and correlation technique according to the signal frequency range.
Background technology
In general, when communication system will transmit data, communication system all can be modulated to form corresponding signal to be transmitted data to be transmitted, treats transmission signal with an amplifying circuit again and carries out power amplification so that signal is sent.Please refer to Fig. 1, its signal be the circuit diagram of a traditional tuning amplification circuit 10.Amplifying circuit 10 is biased between direct voltage V and the earth terminal voltage G, be provided with a n-type metal oxide semiconductor transistor M0 in it to realize an amplifier, and capacitor C p in parallel and inductance L p just form an appearance sense groove (LC-tank), and constitute a load circuit 12 with resistance R p, wherein the equiva lent impedance of load circuit 12 can change with its operation frequency.The grid of transistor M0 is used for receiving input signal Si (signal just to be transmitted), and between its drain electrode-source electrode the electric current of conducting correspondence, with the output signal So after setting up power amplification on the load circuit 12.
Please continue with reference to figure 2, its signal be the situation of the equiva lent impedance of load circuit 12 with frequency change.The transverse axis of Fig. 2 is a frequency, and the longitudinal axis is the amplitude (magnitude) of equiva lent impedance.Hold the sense equiva lent impedance that groove provided and can present bandpass characteristics at frequency domain, this bandpass characteristics can be described by resonance frequency and Q value (or claiming quality factor, Quality factor).Resonance frequency has determined the position of passband on frequency domain, and the Q value then can be used to reflect the gain extreme value of the frequency range and the passband of passband.Change the capacitance of capacitor C p in the appearance sense groove and the inductance value of inductance L p, just can change the resonance frequency and the Q value of its bandpass characteristics, change the bandpass characteristics of its frequency domain jointly.In Fig. 2, the different bandpass characteristics that the different Q value is caused have been shown.As shown in Figure 2, the combination of capacitor C p and inductance L p can make load circuit 12 have higher Q value in the sense groove if hold, and then the extreme value of its equiva lent impedance also can be higher; Relatively, the pairing passband frequency range of high Q value also can be narrow.On the other hand, the combination of capacitor C p and inductance L p can make load circuit 12 have lower Q value in the sense groove if hold, and then its pairing frequency range will be than broad, but can sacrifice its impedance, makes its impedance extreme value reduction; And the Low ESR of load circuit 12 will make the overall power gain of amplifying circuit 10 reduce, and is unfavorable for the signal power amplification.
Please continue with reference to figure 3, its signal be that load circuit 12 is in the situation that equiva lent impedance is provided for different channel.The transverse axis of Fig. 3 is a frequency, and the longitudinal axis then is the amplitude of equiva lent impedance.In Fig. 3, suppose that frequency f 0, f1 are respectively neither co-channel (adjective) centre frequency, and the power gain that amplifying circuit 10 can provide for each frequency f 0, f1, just depend on that load circuit 12 is each frequency f 0, equiva lent impedance that f1 provided.But, as shown in Figure 3, if the combination of capacitor C p and inductance L p can make load circuit 12 have higher Q value in the appearance sense groove, then the equiva lent impedance of load circuit 12 can have narrower frequency range, on behalf of the bandpass characteristics of its equiva lent impedance, this can have frequency selectivity highly, for the equiva lent impedance that different frequency provided can have sizable difference.That is to say that high Q value load circuit 12 can't provide impartial equiva lent impedance for the frequency of different channel.Jointly, amplifying circuit 10 also just can not provide impartial power gain for the signal to be transmitted (being input signal Si) of different channel.
In comparison, the combination of capacitor C p and inductance L p can make load circuit 12 have lower Q value in the sense groove if hold, and its frequency selectivity will be lower, for the equiva lent impedance that different frequency provided is also comparatively close, and equalization comparatively.But, just as shown in Figure 2, low reactance-resistance ratio can make the equiva lent impedance of load circuit 12 low, is unfavorable for the signal power gain.
In order to improve the multitask usefulness of transfer of data, can utilize the signal of different channel to come swap data between the different members of network system.For example, as the wireless network under IEEE 803.11a specification, will mark off a plurality of different channels between the frequency range of 1GHz (10^9Hz), each channel takies different frequency ranges.In order to realize the communication need under this multichannel specification, the amplifying circuit in the communication system also should be wanted and can carry out impartial power amplification for the signal to be transmitted under the different channel widely.Yet existing traditional tuning amplification circuit 10 is that p is formed with definite value capacitor C p, definite value inductance L, so its gain can pin down mutually with frequency range.If the combination of capacitor C p, inductance L p has high Q value, will sacrifice frequency range, impartial power gain can't be provided for the signal to be transmitted of different channel.If make the combination of capacitor C p, inductance L p have low reactance-resistance ratio, will sacrifice gain, preferable power gain can't be provided.Also therefore, the existing definite value in communication system is held sense groove tuning amplification circuit and is difficult to take into account power gain and frequency range requirement.
Summary of the invention
Therefore, the present invention will propose a kind of communication system and correlation technique with preferred construction, to overcome the shortcoming of prior art.
In general, all can be provided with frequency synthesizer (frequencysynthesizer) in the communication system, be used for to synthesize respectively the tuning signal of different frequency for different channel according to certain reference signal frequently.When communication system will be at a certain channel transmitting data, frequency synthesizer can provide the corresponding signal of coordinating for this channel, and communication system just can be modulated to signal to be transmitted with data to be transmitted according to the frequency of this tuning signal, makes the frequency range of the frequency range of signal to be transmitted corresponding to this channel.And the amplifying circuit in the communication system of the present invention just can with this frequency synthesizer Collaboration.Can be provided with an amplifier, a load circuit and a mapping circuit in the amplifying circuit in communication system of the present invention.Adopted variable appearance sense groove that variable equiva lent impedance is provided in the load circuit, and mapping circuit just can be judged the frequency range of signal to be transmitted according to the operation situation of frequency synthesizer, and adjust the variable equiva lent impedance of variable capacity sense groove accordingly, make the passband of equiva lent impedance can move to the frequency range of signal to be transmitted, make communication system of the present invention carry out preferable power amplification for signal to be transmitted at frequency domain.So, the present invention just can take into account the power gain on each channel, and needn't compromise between gain-frequency range.
That is to say that the present invention can adopt the high-gain with suitable Q value to hold the sense groove equiva lent impedance is provided.Though holding the sense groove, high Q value can have narrower passband frequency range at frequency domain, but because mapping circuit of the present invention can move to the frequency range of signal to be transmitted with the high Q value passband of variable capacity sense groove according to the frequency range of signal to be transmitted, so still can carry out the power amplification of high-gain for signal to be transmitted.When communication system when different time adopts the signal to be transmitted of different frequency bands, mapping circuit of the present invention also can dynamically be adjusted the equiva lent impedance of variable capacity sense groove at any time according to the frequency band range of signal to be transmitted, the signal to be transmitted that so just can be different channel with the high-gain of equalization carries out power amplification, needn't compromise between gain-frequency range as prior art.
Implementation detail of the present invention can further specify as follows.In frequency synthesizer, can constitute a phase-locked loop with a frequency plot detector, a low pass filter, a voltage-controlled oscillator (VCO) and a 1/N frequency divider.Voltage-controlled oscillator (VCO) can shake a tuning signal, and frequency divider can be to this tuning signal frequency division, and the frequency plot detector just can compare the tuning signal behind this frequency division and certain reference signal frequently, to detect frequency, phase difference between the two.Low pass filter can be feedback the control voltage-controlled oscillator (VCO) according to the comparative result of frequency plot detector, makes voltage-controlled oscillator (VCO) adjust the frequency of tuning signal.Revise the frequency of tuning signal repeatedly with this feedback loop, the frequency behind the tuning signal frequency division just can be locked as the frequency of reference signal.Also therefore, the frequency of tuning signal just equal the reference signal frequency N doubly.Change the frequency division N value (this frequency division N value can be considered frequency division data) of 1/N frequency divider, the tuning signal that just can produce different frequency is modulated to data to be transmitted to different channels.In other words, this frequency division N value has just been represented the frequency range of data to be transmitted.And mapping circuit of the present invention just can be adjusted the appearance sense groove equiva lent impedance of variable load circuits according to the frequency division N value of frequency divider, makes the frequency of equiva lent impedance show the frequency range that can meet signal to be transmitted.
In one embodiment of this invention, the variable capacity sense groove in the variable load circuits is with a variable capacitance circuit and certain value inductance institute structure.This variable capacitance circuit is that the amplifier in amplifying circuit provides variable capacitance by a connectivity port, and the resonance frequency that holds the sense groove can be changed with capacitance, and then makes the passband that holds sense groove equiva lent impedance can translation on frequency domain.Can be provided with the switch of a plurality of definite value electric capacity and a plurality of correspondences in this adjusted circuit; Each switch is corresponding to an electric capacity, and whether whether may command should can be connected in this connectivity port by correspondence electric capacity in the conducting of each switch.When the amplifying circuit in the communication system of the present invention operates, the conducting that mapping circuit just can be controlled each switch according to the frequency division N value in the frequency synthesizer (value of frequency division data just) respectively whether, to adjust the capacitance that this variable capacitance circuit is provided.
Description of drawings
Fig. 1 is the circuit diagram of a traditional tuning amplification circuit.
What Fig. 2 illustrated is the frequency domain characteristic that definite value is held sense load slot circuit among Fig. 1.
Fig. 3 signal be that definite value is held sense load slot circuit and is equiva lent impedance that different channel provided among Fig. 1.
Fig. 4 is the circuit diagram of communication system of the present invention.
Fig. 5 further implements the sample attitude for communication system among Fig. 4.
Fig. 6 signal be the amplifying circuit of tool variable load circuits among Fig. 4 provides impartial power gain for the different channel signal situation.
What Fig. 7 illustrated is the operation workflow of communication system among Fig. 4.
The reference numeral explanation
10,30 amplifying circuits, 20 communication systems
12 load circuits, 24 frequency synthesizers
22 variable load circuits, 26 interface circuits
28 mapping circuits, 32 frequency dividers
PFD frequency plot detector LPF low pass filter
VCO oscillator Nc-Nd figure place
Na-Nb node C variable capacitance circuit
S1-S2 switch M amplifier
V direct voltage M0 transistor
N-Data, N-Dt frequency division data CLK clock
F0-f1, fa-fc frequency Za-Zc equiva lent impedance
Si-So, Fref-Ft, LE signal Lp, L inductance
Rp resistance Cp, C0-C2 electric capacity
Embodiment
The present invention proposes a kind of communication system, and it uses the tuning amplification circuit of a tool variable load circuits, then can take into account high-gain and high frequency range, thinks that each channel that distributes in the vast frequency range provides impartial high power gain.Please refer to Fig. 4, the functional block diagram that is communication system one embodiment 20 of the present invention of its signal.Be provided with a frequency synthesizer 24 and an amplifying circuit 30 in the communication system 20, and can latch signal LE by an interface circuit 26 (for example being a three-wire interface, TWIF, Three-Wire InterFace) reception one frequency division data N-Data, a clock CLK and.Interface circuit 26 can receive frequency division data N-Data according to the triggering of clock CLK, these frequency division data N-Data is converted to the frequency division data N-Dt of Nd position (Nd is a certain value), and, allow frequency synthesizer 24 and amplifying circuit of the present invention 30 can obtain these frequency division data N-Dt via the bus of Nd position according to latching the control of signal LE and keeping (hold) these frequency division data N-Dt.24 of frequency synthesizers can utilize certain frequency reference signal Fref to synthesize the tuning signal Ft of a correspondence according to the indication of frequency division data N-Dt.For example, frequency synthesizer 24 can decide a multiplying power N according to the value of frequency division data N-Dt, and the frequency that makes tuning signal Ft for the N of the fixed frequency of reference signal Fref frequently doubly.When the value of frequency division data N-Dt changed, frequency synthesizer 24 will corresponding change N value, makes the also change thereupon of frequency of tuning signal Ft.The tuning signal Ft that is provided according to frequency synthesizer 24, communication system 20 just can be modulated to data to be transmitted signal to be transmitted, the frequency range that makes this signal to be transmitted near the frequency of tuning signal Ft, is allowed the frequency range of signal to be transmitted corresponding to the frequency of tuning signal Ft by carrier modulation.And this signal to be transmitted can be output signal So by amplifying circuit 30 with its power amplification as the input signal Si of amplifying circuit 30 just.
Because frequency division data N-Dt can determine the frequency of tuning signal Ft, and the frequency range of input signal Si is just corresponding to the frequency of tuning signal Ft, so frequency division data N-Dt just can be used for representing the frequency range of input signal Si.In fact, frequency division data N-Data (and N-Dt) is used for to the used channel of communication system 20 indication communications.
More particularly, in frequency synthesizer 24, be provided with a frequency plot detector PFD, a low pass filter LPF, a voltage-controlled oscillator (VCO) VCO and a 1/N frequency divider 32, to constitute a phase-locked loop.Voltage-controlled oscillator (VCO) VCO shakes tuning signal Ft, and frequency divider 32 determines corresponding frequency division N value according to frequency division data N-Dt, with this frequency division N value to tuning signal Ft frequency division.Frequency plot detector PFD just can compare the tuning signal behind this frequency division with fixed reference signal Fref frequently, to detect frequency, phase difference between the two.Low pass filter LPF feedbacks according to the comparative result of frequency plot detector PFD and controls voltage-controlled oscillator (VCO) VCO, the frequency that makes voltage-controlled oscillator (VCO) VCO feedback the tuning signal Ft of adjustment, revise the frequency of tuning signal Ft repeatedly with this feedback loop, make the frequency behind the tuning signal Ft frequency division can be locked as the frequency of deciding frequency reference signal Fref.Also therefore, the frequency of tuning signal Ft just equal to decide frequency reference signal Fref frequency N doubly.Change the frequency division N value that frequency division data N-Data (and N-Dt) just can change frequency divider 32, modulate the signal to be transmitted of different channel with the tuning signal Ft that produces different frequency via the phase-locked loop.
Just as before discussing, the signal to be transmitted of different channel can be distributed in the broad frequency range; For different channel input signal Si provides impartial power gain, be provided with an amplifier M, a variable load circuits 22 and a mapping circuit 28 in order to realize spirit of the present invention in the amplifying circuit 30 of tool variable load circuits of the present invention.Wherein, amplifier M can provide corresponding electric power (similarly being electric current) according to input signal Si, with the output signal So after setting up power amplification on the variable load circuits 22.Variable load circuits 22 can provide variable equiva lent impedance, and mapping circuit 28 can be adjusted the equiva lent impedance of variable load circuits 22 according to the value of frequency division data N-Dt, equiva lent impedance can be changed, on frequency domain, the passband of equiva lent impedance is moved to the frequency range of input signal Si with the frequency division data.So, the present invention just can provide impartial power gain by the input signal Si for different channel under the situation of not sacrificing power gain.
As shown in Figure 4, in one embodiment of this invention, variable load circuits 22 of the present invention can form one with a variable capacitance circuit C and certain value inductance L and hold the sense groove.Variable capacitance circuit C can provide variable capacitance, and mapping circuit 28 is controlled the capacitance (for example being to control the capacitance that variable capacitance circuit C is provided via a Nc position bus) that variable capacitance circuit C is provided according to frequency division data N-Dt exactly, the resonance frequency (with passband) of variable load circuits 22 can be moved on frequency domain, allow the passband of variable load circuits 22 can actual coincidence the frequency range of input signal Si.In general, resonance frequency (and position of the passband) meeting of holding the sense groove is inversely proportional to the square root of the product of capacitance and inductance value, so as long as change the capacitance that holds in the sense groove, just can change the position of resonance frequency and passband.When real the work, a mapping table (mapping table) is set in the mapping circuit 28 of the present invention, realize the function of mapping circuit 28 of the present invention in the corresponding mode of tabling look-up.Set its pairing variable capacitance steer mode respectively for different frequency division data N-Dt in advance in this mapping table.When mapping circuit 28 is received the frequency division data N-Dt of a certain numerical value, just can table look-up and find out corresponding variable capacitance steer mode, and come the actual variable capacitance circuit C that controls with this steer mode.For example, if frequency division data N-Dt representative is a bigger frequency division N value, represent input signal Si can be modulated to higher frequency range, and mapping circuit 28 just can make variable capacitance circuit C reduce the capacitance that it provides accordingly, move to high frequency with passband, in response to the input signal Si of lower frequency range with variable load circuits 22.
Please refer to Fig. 5, it has illustrated enforcement sample attitude of the present invention in more detail.As shown in Figure 5, the variable capacitance circuit C in Fig. 4 can be realized by a plurality of definite value capacitor C 0, C1, C2 collocation switch S 1, S2.Node Na-Nb can be considered the connectivity port of variable capacitance circuit C, and capacitor C 0, C1, C2 promptly be parallel on this connectivity port, makes variable capacitance circuit C can be thus connected port its variable capacitance is provided.Wherein, capacitor C 0 can be variable capacitance circuit C basic capacitance is provided, switch S 1, S2 correspond respectively to capacitor C 1, C2, whether the conducting of switch S 1, S2 can control corresponding capacitor C 1 respectively, whether C2 can be connected in the connectivity port, and mapping circuit 28 just can be controlled the conducting of each switch S 1, S2 according to the value of frequency division data N-Dt respectively with two signals (Nc=2), to adjust the capacitance that variable capacitance circuit C can provide between node Na-Nb.For example, when mapping circuit 28 will reduce the electric capacity that variable capacitance circuit C provided, can make switch S 1, the neither conducting of S2, and variable capacitance circuit C just only provides capacitance by capacitor C 0, this capacitance can make the passband of variable load circuits 22 move to high frequency, think that the input signal of high frequency domain channel carries out power amplification.Relatively, when mapping circuit 28 will increase the electric capacity that variable capacitance circuit C provided, just optionally make switch S 1, S2 conducting.For example, when switch S 1, the equal conducting of S2, the capacitance that variable capacitance circuit C is provided will be the capacitance summation of capacitor C 0, C1, C2, and this high capacity just can make the passband of variable load circuits 22 move to low frequency, think that the input signal of low frequency domain channel carries out power amplification.In addition, as shown in Figure 5, amplifying circuit 30 is biased between direct voltage V and the earth terminal voltage G, and the amplifier M among Fig. 4 can realize with (but a being not limited to) n-type metal oxide semiconductor transistor.
Please continue with reference to figure 6, its signal be exactly that amplifying circuit 30 of the present invention utilizes mapping circuit 28 and variable load circuits 22 situation the different channel input signal is gained amplify, the transverse axis of Fig. 6 is a frequency, the longitudinal axis is the amplitude of equiva lent impedance.N-Dt (asks for an interview Fig. 4 when the frequency division data, when Fig. 5) making frequency synthesizer 24 synthesize frequency to be the tuning signal Ft of fa, represent the input signal Si of amplifying circuit 30 also can be modulated near the frequency f a, and the variable capacitance that mapping circuit 28 of the present invention just can be adjusted in the variable load circuits 22 according to frequency division data N-Dt (for example is the switch S 1 that makes among Fig. 5, S2 is conducting all), make variable load circuits 22 that equiva lent impedance Za (as shown in Figure 6) can be provided on frequency domain, coming with this equivalent impedance Z a is that near the input signal Si of frequency range frequency f a carries out power amplification.In like manner, when frequency division data N-Dt changes and when wanting frequency synthesizer 24 to synthesize the tuning signal Ft of frequency f b, represent communicating circuit 20 will change the used channel of communication and signal to be transmitted is modulated near the frequency f b, and mapping circuit 28 of the present invention just can be by learning among the frequency division data N-Dt that this channel changes, and adjust the variable load (for example being to make a certain switch S 1 or not conducting of S2) of variable load circuits 22 accordingly to reduce total capacitance value, make variable load circuits 22 that equiva lent impedance Zb can be provided on frequency domain, with in response near the input signal Si of frequency range frequency f b.
By that analogy, when frequency division data N-Dt indication frequency synthesizer 24 will provide the high-frequency tuning signal Ft of frequency f c, the input signal Si of amplifying circuit 30 of the present invention can be modulated onto near the frequency f c, and mapping circuit 28 of the present invention will to adjust variable load circuits 22 accordingly (for example be to make switch S 1, the neither conducting of S2, the capacitance that holds the sense groove with further reduction), make variable load circuits 22 that equiva lent impedance Zc can be provided on frequency domain, with in response near the input signal Si of frequency range frequency f c.
Because the Collaboration of mapping circuit 28 and variable load circuits 22, communication system 20 of the present invention just can dynamically provide the gain of equalization for the input signal Si of each different channel in response to the frequency range of input signal Si.In the equivalence, the adjustment control of 28 pairs of variable load circuits 22 of mapping circuit is exactly that the equiva lent impedance passband of variable load circuits 22 can be moved on frequency domain, and the equiva lent impedance passband that these move just can synthesize a smooth wideband equiva lent impedance, and the input signal Si that represents amplifying circuit 30 of the present invention to can be different frequency bands in the broad frequency range provides impartial power gain.Because the present invention carries out power amplification in the mode that the frequency domain passband moves, so each equiva lent impedance Za, Zb among the present invention, Zc or the like can be the equiva lent impedances of high Q value, so that high power gain to be provided.Though the passband of high Q value equiva lent impedance is narrower, the running of mapping circuit 28 can make these passbands be moved to the frequency range of input signal Si effectively, and the input signal that still can be different channel provides impartial power gain.Also therefore, the present invention can take into account high power gain and high frequency range, needn't will compromise between frequency range and power gain as traditional tuning amplification circuit 10.
When realization is of the present invention, can adopt equiva lent impedance Za, Zb, the Zc of suitable Q value, make each equiva lent impedance itself can contain the channel of some, and the back of these equiva lent impedances combinations just can be contained more multichannel in broad frequency range.For example, if the frequency f a ' of a certain channel just near frequency f a, can be contained by the passband of impedance Z a too, then frequency f a, fa ' just can share same equiva lent impedance Za.In other words, when mapping circuit 28 learnt that via the frequency division data frequency of tuning signal is fa or fa ', mapping circuit 28 all can make variable load circuits 22 that equiva lent impedance Za is provided.The circuit complexity of the many-one mapping relations energy economization variable load circuits 22 of this " multichannel is to same equiva lent impedance " makes variable load circuits 22 needn't realize out the equiva lent impedance of too many kind.
Please refer to Fig. 7, its signal be the operation workflow 100 of communication system 20 of the present invention.Following steps are arranged in the flow process 100:
Step 102: the frequency division N value with frequency division data N-Data (Fig. 4) control frequency synthesizer 24 makes frequency synthesizer 24 that the tuning signal of respective frequencies can be provided.
Step 104: mapping circuit 28 can be adjusted variable load circuits 22 accordingly according to the frequency division data, and the passband of variable load circuits 22 can be moved with the frequency range in response to input signal at frequency domain.
Step 106: keep the impedance of variable load circuits 22.If frequency division data N-Data changes, represent the channel of input signal Si to change, and flow process 100 just can repeat step 102,104 and 106, again in response to the input signal Si that is modulated to new channel.
In fact, flow process 100 can trigger down in clock CLK, the control of latching signal LE (Fig. 4, Fig. 5) and repeat, and dynamically gives correspondence at any time when the channel of input signal Si changes, and the power gain of equalization is provided with the input signal to different channel.
In the embodiment of Fig. 4 to Fig. 7, be that the frequency synthesizer 24 with the phase-locked loop is that example illustrates operation situation of the present invention.Yet, among the present invention amplifying circuit 30 also can with the frequency synthesizer Collaboration of other type, be not limited to the frequency synthesizer of phase-locked loop.Any being used for can be used by mapped circuit 28 too to the signal of frequency synthesizer indication communication channel, allow mapping circuit 28 can adjust variable load circuits 22, can carry out impartial power gain for the signal to be transmitted of different channel so that the present invention has the communication system of variable load circuits according to the channel (frequency range) of signal to be transmitted.What be worth emphasizing is that frequency synthesizer is the circuit that originally just must possess in the modern communication systems, so the present invention does not need additionally to set up a frequency synthesizer to realize.In addition, when realizing variable load circuits 22, also can adopt variable inductance or the like.For example, variable load circuits 22 can include a plurality of impedance units and corresponding switch, and whether whether this counterpart impedance unit of may command can provide its impedance in the conducting of each switch.And the conducting of mapping circuit 28 each switch of control just can be adjusted the total impedance that this variable load circuits provides.Picture is in the embodiment of Fig. 5, and capacitor C 1, C2 just can be considered impedance unit, and switch S 1, S2 are exactly corresponding switch.Certainly, each impedance unit also can be formed by inductance.
In summary, the frequency range and the gain relationship that pin down mutually in traditional tuning amplification circuit, communication system of the present invention can come the dynamically signal of corresponding different frequency bands with the adjustment of variable load, so impartial high power gain can be provided for the signal of different channel in the broad frequency range.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. communication system, it includes:
One frequency synthesizer, it is controlled by frequency division data and produces the tuning signal of a correspondence according to a reference signal, and the frequency that makes this tuning signal is corresponding to the frequency of this reference signal and the value of these frequency division data; And this communication system can provide an input signal according to the frequency of this tuning signal, makes the frequency of the frequency range of this input signal corresponding to this tuning signal; And
One amplifying circuit, it includes:
One amplifier and a load circuit, this load circuit are used to provide an equivalent impedance, and this amplifier can be set up the output signal of a correspondence according to this input signal on the equiva lent impedance that this load circuit provides; And
One mapping circuit is used for adjusting according to the value of these frequency division data the equiva lent impedance of this load circuit, and described equiva lent impedance can be changed with these frequency division data.
2. communication system as claimed in claim 1, wherein, comprise a phase-locked loop in this frequency synthesizer, include a frequency divider in this phase-locked loop, it can be according to the value of these frequency division data and to this tuning signal frequency division, and this phase-locked loop can be adjusted to the frequency behind this tuning signal frequency division the frequency of this reference signal, and the frequency that makes this tuning signal is corresponding to the frequency of this reference signal and the value of these frequency division data.
3. communication system as claimed in claim 1 wherein, includes in this load circuit: at least one inductance; And
One variable capacitance circuit is used to provide variable capacitance; This mapping circuit is adjusted the capacitance that this variable capacitance circuit provides according to the value of these frequency division data, and the equiva lent impedance that this load circuit is provided can change with these frequency division data.
4. communication system as claimed in claim 3, wherein, this variable capacitance circuit is provided with a connectivity port, and this variable capacitance circuit provides variable capacitance via this connectivity port; And include at least one electric capacity and at least one switch in this variable capacitance circuit; Each switch is corresponding to an electric capacity, and whether whether may command should can be connected in this connectivity port by correspondence electric capacity in the conducting of each switch; And this mapping circuit system controls each switch according to the value of these frequency division data conducting whether, to adjust the capacitance that this variable capacitance circuit is provided.
5. communication system as claimed in claim 1, wherein, this load circuit provides equiva lent impedance via a connectivity port; And include at least one impedance unit and at least one switch in this load circuit; Each switch is corresponding to an impedance unit, and whether whether this counterpart impedance unit of may command can be connected in this connectivity port in the conducting of each switch; And this mapping circuit is controlled the conducting of each switch according to the value of these frequency division data, to adjust the equiva lent impedance that this load circuit is provided.
6. communication system as claimed in claim 5, wherein, each impedance unit is an electric capacity.
7. communication system as claimed in claim 1 wherein, when this mapping circuit is adjusted the equiva lent impedance of this load circuit according to the value of these frequency division data, can move and corresponding to the frequency range of this input signal the passband of described equiva lent impedance in frequency domain.
8. method of carrying out the tuning amplification of communication signal, to provide an output signal according to an input signal, it includes this method:
Set frequency division data;
Carry out a frequency synthesis program, to utilize a reference signal to produce the tuning signal of a correspondence according to these frequency division data, the frequency that makes this tuning signal is corresponding to the frequency of this reference signal and the value of these frequency division data, and makes the frequency of the frequency range of this input signal corresponding to this tuning signal;
Carry out a mapping program, provide the equiva lent impedance of a correspondence, make the value of described equiva lent impedance can reflect the value of these frequency division data with value according to these frequency division data; And
Carry out a tuning amplification procedure, on described equiva lent impedance, to set up this output signal according to this input signal.
9. method as claimed in claim 8 wherein, when carrying out this mapping program, at the frequency division data of different numerical value and be combined into described equiva lent impedance with the impedance component of varying number, makes the value of described equiva lent impedance can reflect the value of these frequency division data.
10. method as claimed in claim 8 wherein, when carrying out this mapping program, can move and corresponding to the frequency range of this input signal the passband of described equiva lent impedance in frequency domain.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US74699006P | 2006-05-11 | 2006-05-11 | |
| US60/746,990 | 2006-05-11 |
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| CN1960349A CN1960349A (en) | 2007-05-09 |
| CN100550872C true CN100550872C (en) | 2009-10-14 |
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| TWI528725B (en) | 2013-05-06 | 2016-04-01 | 國立中山大學 | Wideband frequency synthesizer and frequency synthesizing method thereof |
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2006
- 2006-11-22 TW TW95143177A patent/TWI326972B/en active
- 2006-11-28 CN CNB200610162580XA patent/CN100550872C/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN1960349A (en) | 2007-05-09 |
| TWI326972B (en) | 2010-07-01 |
| TW200743304A (en) | 2007-11-16 |
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