TWI326972B - Communication system and related method - Google Patents

Description

1326972 IX. Description of the invention: 'Technical field to which the invention pertains>> The present invention is directed to a communication system and related methods, and more particularly to a signal-to-signal that can dynamically adjust the equivalent impedance according to the frequency range of the signal to different frequency ranges. A communication system and related methods for equal power amplification. [Prior Art] Generally speaking, when the communication system wants to transmit data, the communication system will modulate the _ (four) data to form the corresponding signal to be transmitted, and then use a large circuit to treat the power of the signal. To send the signal out. θ > test 1st circle, which is a circuit diagram of a conventional modulation and amplification circuit 丨〇. The amplifying circuit 10 is biased between the DC voltage V and the ground terminal voltage G, and is provided with an n-type MOS transistor to realize an amplifier, and the parallel capacitor CP and the inductor form a capacitive groove (LC enchantment) And the resistor Rp- is structured as a negative-cut circuit 12, wherein the equivalent para-impedance of the load circuit 12 changes with the operating frequency thereof. The gate of the transistor is used to receive the input signal SU, which is the signal to be transmitted. And turn on the corresponding current between its drain and source to establish the power amplified output on the load circuit 12. Please continue to refer to Figure 2, the impedance changes with frequency. The magnitude of the effect impedance is shown as the equivalent of the load circuit 12. The horizontal axis of the graph is the frequency, and the vertical axis is equal. The equivalent impedance provided by the tank will be 6 1326972. The bandpass characteristic of its equivalent impedance will have a high frequency selectivity, and the equivalent impedance provided for different frequencies will vary considerably. That is to say, the Q load circuit [2] cannot provide equal equivalent grounding for the frequencies of different channels, and the amplifying circuit 1G cannot provide equal power gain for the transmitting wheel k (i.e., input number Si) of different channels. . In contrast, if the combination of the capacitance Cp and the inductance Lp in the capacitive tank causes the load circuit 12 to have a lower q value, the frequency selectivity is lower, and the equivalent impedance provided for repairing the same frequency is also relatively high. Similar, more equal. However, ^ as shown in Fig. 2, the low q value causes the equivalent impedance of the load circuit 12 to be low, which is detrimental to the signal power gain. · In order to improve the performance of data transmission, different channels of the network system can use different channel signals to exchange data. For example, a wireless network like the mEE 8〇3.lla specification τ will occupy a different frequency range in the igHz (gift Hz) frequency & In order to achieve this multi-channel specification for communication needs, communication systems. The amplifying circuit in the middle should also be able to widely amplify the power of the signal to be transmitted under the same channel. However, the conventional tuning amplifier circuit 1 is formed by a constant value capacitor Cp and a constant value inductor Lp. Therefore, the gain and bandwidth will be mutually restrained. If the combination of Ray 6^, Electric Valley Cp, and Inductor Lp has a high Q value, it will sacrifice the frequency to 'cannot provide equal power enhancement for the signals to be transmitted of different channels. Right The combination of the capacitor Cp and the inductor 0 has a low q value of 8 1326972 = the gain of the amp, which does not provide a better power gain. Therefore, it is difficult to balance the power and frequency in the communication first. Width requirements. [Invention] The present invention is intended to provide a communication system and related method with a better architecture to overcome the shortcomings of the prior art. A fluency synthesizer is used to synthesize different frequency modulation signals for different channels according to a certain frequency reference signal. When the communication system wants to transmit data on a certain .iit, it is a fresh synthesis. The communication system can adjust the communication signal according to the frequency of the spectrum signal to adjust the signal to be transmitted into a signal to be transmitted, so that the frequency range of the signal to be transmitted corresponds to the frequency range of the channel. The amplifying circuit in the communication system can cooperate with the frequency synthesizer. In the amplifying circuit of the communication system of the present invention, an amplifier, a load circuit and a pair of pair circuits are provided. The load circuit is used in the middle. The variable capacitance slot provides a variable equivalent impedance, and the mapping circuit can determine the frequency range of the signal to be transmitted according to the operation condition of the frequency synthesizer, and adjust the variable equivalent of the variable capacitance slot correspondingly. Resisting and anti-resistance enables the passband of the equivalent impedance to be at or below the frequency range of the signal to be transmitted, so that the communication system of the present invention can perform better power amplification for the signal to be transmitted. Thus, the present invention can Take into account the power gain on each channel, 9 1326972 without having to compromise between gain-bandwidth. Heart / that is, 'the invention can use high gain capacitive effect impedance with appropriate Q value. Although high Q value The slot will have a narrower frequency in the frequency domain. However, since the mapping circuit of the present invention converts the (four) value passband of the variable capacitive slot to the signal to be transmitted according to the signal to be transmitted, the signal can be transmitted: Performing a high-gain power amplifier = Mingying also adjusts the equivalent impedance of the variable-capacitance slot dynamically according to the frequency band of the signal to be transmitted, so that it can be equalized by equal T The channel's signal to be transmitted is amplified by power, and it is not necessary to compromise between gain-bandwidth like the driving technique. The implementation details of the invention can be further explained as follows. In the frequency synthesizer σο «frequency phase detector, one Low-pass filter, a voltage-controlled oscillator and a 1/N frequency divider are used to structure the phase-locked loop. The voltage-controlled oscillator can be shocked. The white-hole number divider can adjust the frequency of this signal, and The frequency phase detector can compare the adjusted Wei number with the fixed frequency reference signal to detect the difference between the two frequencies and the phase. The low-wave filter can be used to control the voltage-controlled shock absorber, and the voltage of the voltage-controlled shock n (four) is reduced. In this way, the frequency of the spectrum signal is corrected repeatedly, and the Pu signal can be locked into the reference signal by the (four) (four) rate. This is the case, the information is fresh in the reference message ~ times. Change the frequency division N value of the 1/N frequency divider (this frequency division N value, the frequency data, can generate the tuning signal of different frequencies to change the data: to the different channels. In other words , the solution range of the frequency-reversed N-value transmission data. * The frequency-resolved N value of the circuit-readable circuit of the present invention is adjusted to adjust the capacitance of the variable load-carrying circuit. Frequency range of the signal to be transmitted θ θ In one embodiment of the present invention, the variable capacitance slot in the variable load circuit is constructed by a capacitor circuit and a certain value inductor. The path is connected by -·: the variable=electric# value is provided to the amplifier in the amplifying circuit: the resonant frequency of the sensing tank can be changed with the capacitance value, so that the passband of the equivalent impedance of the capacitive slot can be in the frequency The variable circuit has a complex _疋 value capacitor and a plurality of corresponding on and off; each switch pair ～ 电气# 'every switch is turned on or off to control whether the corresponding capacitor can be connected In the connection, when the amplifying circuit in the communication line of the present invention is operated, 'Yinglong Road can be synthesized according to the solution. In addition to the frequency Ni (that is, *frequency: the value of the material), the respective switches are controlled to be turned on or off to adjust the capacitance value provided by the variable capacitance circuit. [Embodiment] I invention proposes a communication system Its application - the variable-amplifier circuit's all-amplification circuit' can take into account the high gain and high-frequency width, in order to provide equal high power gain for each channel distributed in the band 1326972. Please refer to Figure 4, It is a functional block of the embodiment 20 of the communication system of the present invention. The communication system 20 is provided with a frequency synthesizer 24 and an amplifying circuit 30, and can be connected by an interface circuit 26 (for example, a three-wire interface, TWIF, Three-Wire). InterFace) receives a frequency division data N-Data, a clock CLK and a latch signal LE. The interface circuit 26 can receive the frequency division data N-Data according to the trigger of the clock CLK to convert the frequency division data N-Data. The frequency division data N-Dt of the Nd bit (Nd is a certain value), and the frequency division data N-Dt is held according to the control of the latch signal φ LE, so that the frequency synthesizer 24 and the amplifying circuit of the present invention 30 can communicate via Nd bit The frequency synthesizer: 24 can synthesize a corresponding tuning signal Ft by using the frequency reference signal Fref according to the indication of the frequency data N_Dt. For example, the frequency synthesizer 24 can be based on The value of the frequency data N-Dt is used to determine the multiple rate N, and the frequency of the tuning signal Ft is N times the frequency of the fixed frequency reference signal Fref. When the value of the frequency division data N-Dt changes, the frequency synthesis device 24 will change the value of N correspondingly, so that the frequency of the tuning signal Ft also changes. According to the tuning signal Ft provided by the frequency synthesizer 24, the communication system 20 can convert the data to be transmitted into a signal to be transmitted, so that The frequency range of the signal to be transmitted is modulated by the carrier to the vicinity of the frequency of the tuning signal Ft, and the frequency range of the signal to be transmitted corresponds to the frequency of the tuning signal Ft. The signal to be transmitted can be used as the input signal S i ' of the amplifying circuit 30 to amplify its power into an output signal S 由 by the amplifying circuit 30. 1326972 Since the frequency division data N-Dt can determine the frequency of the tuning signal Ft, and the frequency range of the input number Si corresponds to the frequency of the tuning signal Ft, the frequency division data N-Dt can be used to represent the frequency of the input signal si. range. Fact =: The frequency division data N-Data (and N_Dt) is the channel used to indicate communication to the communication system 20. More specifically, a frequency phase detection is provided in the frequency synthesizer 24

The PFD, a low pass chopper LPF, a voltage controlled shock If VCO and an I/N divide the frequency 32 to construct a phase locked loop. The voltage controlled oscillator v(7) oscillates the out-of-spectrum signal Ft'. The frequency divider 32 determines the corresponding frequency-divided N value according to the frequency-divided data (10), thereby dividing the 调谐 value to the tuned signal 扒 frequency. The frequency phase: the vertical detective P F D , the money compares the frequency-adjusted 4b signal with the fixed-frequency reference signal F-f, and compares the frequency and phase difference between the two. The comparison result of the low pass = device coffee _ frequency phase detector coffee back and forth control the pressure control shock absorber VCO, so that the voltage of the pressure control shock field Ft, so feedback = = C 〇 feedback adjustment _ rate, The frequency (four) _ rate of the _ signal is adjusted. Also locked to the fixed frequency reference signal signal Fref frequency Ν times. ^Uninterpretation of the fixed frequency reference can change the frequency division value of the frequency divider 32;: N-Data (and N-Di) The same frequency tuning signal Ft is modulated by the phase-locked loop to produce a bad cheek The signal to be transmitted. The transmission signal will be distributed as in the previous discussion (4) 'Do not pass:: si槎: 1 for different channels input for the spirit of the present invention 丄 "30: Equal power gain' The present invention has a variable load The circuit is placed on the circuit (4), the carrier 2 and the amplifier, and the amplifier 提供 can provide a pair of signals according to the input signal Si to establish a power=large round-out signal S on the variable load circuit 22. The variable load circuit 22 can provide a variable equal mapping circuit 28, which can be adjusted according to the value of the frequency division data (4), and the equivalent impedance of the / circuit 22 t, so that the equivalent impedance can be matched with the frequency data (4). The passband of the equivalent ^ is moved to the member of the input signal. Thus, the present invention can provide equal power gain for the input signal Si of different channels without sacrificing power gain. In an embodiment of the present invention, the variable voltage circuit of the present invention can be formed by a variable capacitance circuit C and a constant value inductance L. The oblique deflection two-slot two variable capacitance circuit c can provide a variable capacitance. Value, and the image 8 is based on the frequency data (4) to control the variable capacitance circuit c said "f by, The meta-flow bar controls the available electric valley value, so that the resonant frequency of the variable load circuit 22 (cuts with the material plane, let:::= lose eight, the frequency _ product of the \& pass ▼ position) It will be multiplied by the capacitance value and the inductance value (4) i£i艮^ inverse ratio. Therefore, as long as the capacitance value of the capacitive groove f is changed, the resonance frequency and the position of the pass band can be changed. In practice, the present invention reflects the circuit. 14 1 1326972 28 sets a mapping table, in order to look up the corresponding way - the actual image of the invention of the map 28. This map is set in the table for the different de-frequency data N_Dt Corresponding variable capacitance control mode. When the pairing circuit 28 receives a certain value of the frequency division data, it can look up the table to find the corresponding variable capacitance control mode, and actually control the mode by the control mode. _ variable capacitance circuit c. For example, if the frequency division data N_Dt represents a large frequency division value N, the input signal si will be modulated to a higher frequency range, and the mapping circuit 28 can correspond to The variable capacitance circuit C is made to reduce the capacitance value it provides to pass the variable load circuit 22 The band moves to the high frequency, which corresponds to the input signal Si in the higher frequency range.

▲ Please refer to Figure 5, which illustrates an embodiment of the present invention in more detail. As shown in Fig. 5, the variable capacitance circuit c in Fig. 4 can be realized by a plurality of constant value capacitors C0 and Ch C2 in combination with the switch 8 S2. The node Na-Nb can be regarded as the connection port of the variable capacitance circuit c, and the capacitors (^(7) and φ C2 are connected in parallel to the connection port, so that the variable capacitance circuit c can be connected thereto to provide its variable capacitance value. Wherein, the capacitor c〇 can provide a basic capacitance value for the variable capacitance circuit c, and the switch S2 corresponds to the capacitance (n, c2, whether the switches S1 and S2 are turned on or not respectively can control whether the corresponding capacitance ^C2 can be connected After the connection, the mapping circuit 28 can respectively control the V-pass of each of the switches S1 and S2 by a two-dimensional signal (Nc=2) according to the value of the frequency-removed data N_Dt •, and the variable-capacitance circuit is completed for 6 weeks. c. The capacitance value that can be provided between the nodes Na_Nb, for example, when the mapping circuit 28 is to reduce the capacitance provided by the variable capacitance circuit C 15 1326972, the switches SI and S2 are not turned on, and the variable capacitance circuit is C only provides a capacitance value from the capacitor C0, which will cause the passband of the variable load circuit 22 to move to a high frequency to power amplify the input signal of the high frequency channel. In contrast, when the mapping circuit 28 To increase the capacitance of the variable capacitor and circuit C, the switches S1 and S2 can be selectively turned on. For example, when the switches S1 and S2 are both turned on, the capacitance value provided by the variable capacitor circuit c will be The sum of the capacitance values of the capacitors CO, C, and C2, and this high capacitance The value causes the pass band of the variable load circuit 22 to move to the low frequency, and the power is amplified by the input signal of the low frequency channel. Further, as shown in Fig. 5, the amplifying circuit 30 is biased to the direct current voltage v and the ground terminal voltage. Between G, the amplified state μ in Fig. 4 can be realized by (but not limited to) ___n type gold oxide semi-electric crystal body. Please continue to refer to Fig. 6 which shows the amplification circuit of the present invention. For the circuit 28 and the variable load circuit 22, the gain is amplified by inputting signals to different channels, the horizontal (four) solution of Fig. 6, and the vertical axis is the amplitude of the equivalent impedance. When the frequency division data N_Dt (see section 4, 帛5) The frequency synthesizing 24 is synthesized into a tuning signal having a frequency of fa. When the input signal Si representing the amplifying circuit 30 is also modulated to the vicinity of the frequency & The frequency f is used to adjust the variable capacitance value in the variable load circuit 22 (for example, to make the switch in FIG. 5 all turned on) 'to enable the variable load circuit 22 to provide an equivalent impedance in the frequency domain, such as Figure 6 material) 'This equivalent impedance ^ for the scope of the frequency at 1326972 Large circuit 30 may be a wide frequency band different financial gain of the input signal of equal power. Since the present invention performs power amplification by means of frequency domain passband movement, each equivalent impedance Za'Zb, Zc, etc. in the present invention is equivalent to a high Q equivalent impedance to provide high power gain. . Although the passband of the value equivalent k is f, but the band of the circuit 28 is effectively moved to the frequency range of the input signal Si, the input signal of the == channel provides an equal power gain. Therefore, the high power gain and high frequency width of the present invention do not have to be compromised between the bandwidth and the power gain as in the conventional tuning amplifier circuit. In the implementation of the present invention, an equivalent impedance Za, = of an appropriate Q value can be used, so that each equivalent impedance itself can cover a certain number of channels, and this can cover more channels in a wide frequency band. The second is: the frequency of a certain channel (four) 'is in the vicinity of the frequency fa, and can also be covered by the text 1 'then the frequency fa, fa' can share the same one: in other words, the current pairing circuit 28 is divided by frequency When the data frequency is H fa, the pairing circuit 28 will make it possible to provide an equivalent impedance. This "multi-channel pair-to-equal impedance" relationship can reduce the circuit degree of the variable load circuit 22. 'It is not necessary for the variable load circuit 22 to achieve too many equivalent impedances. 々月]! 第考第/图, which shows the operating machine rank of the communication system 20 of the present invention. The following steps are performed in the process 100: 丄Step 1 〇2: The frequency synthesizer 24 can provide the tuning signal of the corresponding frequency by using the frequency division data Ν-_ (the _ ^ $ ^ frequency division 。 value. Step 104 Step 106 • The mapping circuit 28 can adjust the variable load circuit 22 ′ according to the frequency division data to enable the pass band of the variable load circuit 22 to move in the frequency domain to respond to the frequency range of the input signal. Maintain the variable load circuit 22 Impedance. If the frequency data N Data changes 'represents the channel change of the round signal & and / 瓜 〇〇 1 , then steps 1 〇 2, HM and 1 〇 6 can be repeated, (d) in response to the change to the new The channel's input signal ^. In fact, "丨" Wang 1〇〇 can be repeated under the control of the clock CLK, flash lock signal π (*, picture: >, in the input signal & When the channel is changed, it is dynamically changed at any time, and |V # is provided with power gain of ## for the input signals of different channels. In the fourth to seventh embodiments, the frequency of the phase-locked loop is synthesized as 24 is taken as an example to illustrate the operation of the present invention. However, in the present invention, the amplifying circuit 30 can also be combined with other The surface de-synthesizer (4) operates without limitation: the frequency synthesizer of the i phase iS channel. Any signal used to indicate the communication channel to the frequency synthesizer can also be used by the mapping circuit 28 to enable the mapping circuit 28 to The variable load circuit 22' is adjusted according to the channel (frequency range (1) of the signal to be transmitted so that the communication system with the variable load circuit of the present invention can perform equal power gain for the to-be-transmitted jobs of different channels. It is worth emphasizing that 1326972 The frequency synthesizer is a circuit that is necessary in modern communication systems, so the invention does not need to be additionally provided with a frequency synthesizer. In addition, when the variable negative cutting circuit 22 is implemented, variable power can also be used. Sense, etc. For example, the variable load circuit 22 can include a plurality of impedance units and a pair of switches, and the conduction of each switch can control whether the corresponding impedance unit is - or not, provide its impedance. By controlling the conduction of each switch to the circuit 28, the total impedance provided by the variable load circuit can be attenuated. As in the embodiment of Fig. 5, the capacitances Ci and C2 can be regarded as impedance units. Sb S2 is the corresponding switch. Of course, each impedance unit can also be formed by an inductor. In summary, the communication system of the present invention can be variablely loaded compared to the bandwidth and gain of the conventional tuning amplifier circuit. Adjusting to dynamically respond to signals of different gamut bands, so that it can provide equal high power gain for signals of different channels in a wide frequency band. The above is only a preferred embodiment of the present invention, and the patent application scope according to the present invention The equal changes and modifications made should be within the scope of the present invention. [Simplified Schematic] Figure 1 is a schematic diagram of a conventional tuning amplifier circuit. Figure 2 is a diagram showing the constant value of Figure 1. The frequency domain characteristics of the tank load circuit. Figure 3 is a diagram showing the equivalent impedance provided by the fixed-value capacitive tank load circuit for different channels in Figure 1. 20 1326972 Fig. 4 is a circuit diagram of the communication system of the present invention. Figure 5 is a further embodiment of the communication system in Figure 4. Figure 6 is a diagram showing the case where the amplifying circuit with the variable load circuit of Fig. 4 provides equal power gain for different channel signals. Figure 7 is a diagram showing the operational flow of the communication system in Figure 4.

[Main component symbol description] 】, 30 amplifying circuit 20 communication system 12 load circuit 24 frequency synthesizer 22 variable load circuit 26 interface circuit ·: 28 mapping circuit 32 frequency divider PFD frequency phase detector LPF low-pass filtering Vco oscillator Nc-Nd bit number Na-Nb node C variable capacitance circuit S1-S2. Switch V DC voltage M0 transistor Μ amplifier M_Data, N-Dt frequency division data CLK clock fO-fl, fa-fc Frequency Za-Zc equivalent impedance signal

Si-So, Fref-Ft, LE 1326972 capacitor

Rp resistor Cp, C0-C2 Lp, L inductor

twenty two

Claims (1)

υ·72 X. Patent application scope: = a communication system, comprising: a frequency synthesis benefit, which is controlled by a frequency division data according to a reference signal-generated corresponding tuning signal, so that the frequency of the tuning signal corresponds to the reference signal The frequency and the value of the frequency-divided data; and the communication system can provide an input signal according to the frequency of the tuning signal, so that the frequency range of the input signal corresponds to the frequency of the tuning signal; and an amplifying circuit, comprising: An amplifier and a load circuit for providing an equivalent, and the amplifier can establish a corresponding output signal according to the input signal at an equivalent impedance provided by the load circuit; and a mapping circuit for Adjusting the equivalent impedance of the load circuit according to the value of the frequency division data, so that the equivalent impedance can be changed according to the frequency division data. 2. The communication system of claim 1, wherein the frequency synthesizer comprises a phase-locked loop, the phase-locked loop comprising a frequency divider, which can be based on the value of the frequency-divided data The frequency-locking circuit can adjust the frequency of the tuning signal to the frequency of the reference signal, so that the frequency of the tuning signal corresponds to the frequency of the reference signal and the value of the frequency-divided data. 3. The communication system of claim 1, wherein the load circuit 23 1326972 includes: at least one inductor; and . a variable capacitance circuit for providing a variable capacitance value; the mapping circuit adjusts the capacitance value provided by the variable capacitance circuit according to the value of the frequency division data, so that the equivalent impedance provided by the load circuit It can be changed with the frequency division data. 4. The communication system of claim 3, wherein the variable capacitance circuit is provided with a connection port, the variable capacitance circuit provides a variable capacitance value via the connection port; and the variable capacitance circuit is The circuit includes at least one capacitor and at least one switch; each switch corresponds to a capacitor, and whether the switch is turned on or not can control whether the corresponding capacitor can be connected to the connection port; and the mapping circuit is based on the value of the frequency division data And controlling whether the switches are turned on or not to adjust the capacitance value provided by the variable capacitance circuit. 5. The communication system of claim 1, wherein the load circuit provides an equivalent impedance via a port; the load circuit includes at least one impedance unit and at least one switch; each switch corresponds to a The impedance unit, the conduction of each switch can control whether the corresponding impedance unit can be connected to the connection port; and the mapping circuit controls the conduction of each switch according to the value of the frequency division data to adjust the load circuit The equivalent impedance provided. 24 1326972 wherein each impedance unit 6· is a communication system as claimed in claim 5, which is a capacitor. Ρ 7. For the communication system of patent application No. 5, which is an inductor. Each of the impedance units 'where the equivalent impedance domain of the pair of electric circuits is shifted to correspond to the input 8. If the communication system path of the first application of the patent scope adjusts the negative according to the value of the frequency division data' The passband of the equivalent impedance is made to be in the frequency range of the frequency signal. 9. providing an output signal by performing a method for tuning and amplifying the communication signal according to an input signal, the method comprising: setting a frequency division; performing a frequency synthesis procedure to utilize a reference according to the frequency division data The signal generates a pair of tuning signals, such that the frequency of the tuning signal corresponds to the frequency of the reference signal and the value of the frequency-divided data, and the frequency range of the input signal corresponds to the frequency of the tuning signal; And a program for providing a corresponding effective impedance according to the value of the frequency-divided data, such that the value of the effective impedance can reflect the value of the frequency-divided data; and performing a tuning amplification procedure to be performed according to the input signal The round-trip signal is established on the equivalent impedance. 25 1326972 10. The method of claim 9, wherein when the mapping process is performed, the equivalent impedance is combined with different numbers of impedance elements for different values of the frequency division data The value of the effect impedance can reflect the value of the frequency division data. 11. The method of claim 9, wherein when the mapping process is performed, the passband of the equivalent impedance is movable in the frequency domain to correspond to a frequency range of the input signal. XI. Schema: 26