CN102394607A - High-precision oscillator - Google Patents
High-precision oscillator Download PDFInfo
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- CN102394607A CN102394607A CN2011102529054A CN201110252905A CN102394607A CN 102394607 A CN102394607 A CN 102394607A CN 2011102529054 A CN2011102529054 A CN 2011102529054A CN 201110252905 A CN201110252905 A CN 201110252905A CN 102394607 A CN102394607 A CN 102394607A
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Abstract
The invention provides a high-precision oscillator, which comprises a first oscillating unit and a second oscillating unit, wherein each oscillating unit comprises a resistor for producing a reference peak voltage, a capacitance for producing a comparison voltage, a first current source, a comparison circuit for comparing the reference peak voltage with the comparison voltage and a discharge control circuit, the capacitance of the first oscillating unit is charged by the current provided by a first current source of the first oscillating unit, when the comparison voltage is more than or equal to the reference peak voltage, the comparison circuit of the first oscillating unit informs a discharge control circuit of the first oscillating unit of beginning the discharge and informs the second oscillating unit of stopping discharge, the capacitance of the second oscillating unit is charged by the current provided by the first current source of the second oscillating unit, and when the comparison voltage is more than or equal to the reference peak voltage, the comparison circuit of the second oscillating unit informs a discharge control circuit of the second oscillating unit of beginning the discharge and informs the first oscillating unit of stopping the discharge.
Description
[technical field]
The present invention relates to electronic circuit field, particularly a kind of oscillator of high-precision low-power consumption.
[background technology]
In order to cater to the demand in market, more and more to the research and development of high-precision low-power consumption oscillator, such as the disclosed high-precision low-power consumption oscillators of Chinese patent, be 200810112605.4,200810115218.6 like application number, 200910087721.X etc.It is very low that these oscillators can produce power consumption, and frequency goes in the various power-supply management systems with supply voltage and the less oscillator signal of variations in temperature, but some occasion requires also very high to the frequency change that process deviation causes.Said process deviation is meant the frequency error between the chip that extensive manufacturing process causes, and very high like the standby clock request in the Bluetooth system, clock jitter will cause two to need the Bluetooth system of communication under sleep pattern, can't normally to shake hands and wake up.In some system, high to frequency requirement in bluetooth or USB system, for example require frequency change less than+/-1000ppm, i.e. one thousandth.Crystal oscillator can reach usually+/-100ppm in, but the price of crystal is higher, application cost is also higher.Need at least two crystal oscillators in the conventional bluetooth system, one is used for radio frequency part, and frequency is higher, is generally 26-100MHz, also needs one in addition and is used for the low-frequency clock that sleep pattern is waken up, and like 32KHz or lower, cost also can be than higher like this.
Overcome the problems referred to above because be necessary to propose a kind of improved technical scheme.
[summary of the invention]
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit avoiding the making purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used to limit scope of the present invention.
The object of the present invention is to provide a kind of high precision oscillator, it can obtain the output frequency signal of degree of precision.
According to an aspect of the present invention; The present invention provides a kind of high precision oscillator; It comprises first oscillating unit and second oscillating unit, and wherein each oscillating unit comprises the resistance that produces the reference peak threshold voltage, comparison circuit and the charge/discharge control circuit that produces electric capacity, first current source, more said reference peak threshold voltage and the said comparative voltage of a comparative voltage; The electric current that provides based on first current source of first oscillating unit charges to the electric capacity of first oscillating unit; The comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit be during more than or equal to the reference peak threshold voltage in first oscillating unit, and the charge/discharge control circuit of notifying the charge/discharge control circuit of first oscillating unit to begin to discharge with second oscillating unit stops discharge; The electric current that provides based on first current source of second oscillating unit charges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to the reference peak threshold voltage in first oscillating unit, and the charge-discharge control circuit of notifying the charge/discharge control circuit of second oscillating unit to begin to discharge with first oscillating unit stops discharge.
Further, said first oscillating unit and second oscillating unit are shared a logical circuit, and said logical circuit comprises first NOR gate and second NOR gate, and each oscillating unit also comprises second current source,
Comparison circuit in said first oscillating unit comprises the 3rd NMOS pipe, the 4th NMOS pipe and first inverter; Charge/discharge control circuit in first oscillating unit comprises NMOS pipe; A termination voltage of second current source in first oscillating unit wherein; The resistance that is connected generation reference peak threshold voltage in first oscillating unit between the drain electrode of another termination the 3rd NMOS pipe, the source electrode of said the 3rd NMOS pipe and ground, a termination voltage of first current source in first oscillating unit; The drain electrode of another termination the 4th NMOS pipe; Is connected the electric capacity that produces comparative voltage in first oscillating unit between the source electrode of said the 4th NMOS pipe and the ground, the 3rd NMOS pipe is connected with the grid of the 4th NMOS pipe, and a NMOS manages parallelly connected with the said electric capacity of generation comparative voltage in first oscillating unit; The drain electrode of the 4th NMOS pipe connects the input of first inverter
Comparison circuit in said second oscillating unit comprises the 5th NMOS pipe, the 6th NMOS pipe and second inverter; Charge/discharge control circuit in second oscillating unit comprises the 2nd NMOS pipe; A termination voltage of second current source in second oscillating unit wherein, the drain electrode of another termination the 5th NMOS pipe is connected the resistance of generation reference peak threshold voltage in second oscillating unit between the source electrode of said the 5th NMOS pipe and the ground; One termination voltage of first current source in second oscillating unit; Is connected the electric capacity that produces comparative voltage in second oscillating unit between the drain electrode of another termination the 6th NMOS pipe, the source electrode of said the 6th NMOS pipe and ground, the 2nd NMOS pipe is parallelly connected with the said electric capacity of generation comparative voltage in second oscillating unit; The drain electrode of the 6th NMOS pipe connects the input of second inverter
The output of first inverter is connected with the first input end of first NOR gate; The grid of the one NMOS pipe is connected with second input of first NOR gate and the output of second NOR gate; The output of first NOR gate is connected with the grid of the 2nd NMOS pipe and the first input end of second NOR gate, and the output of second inverter is connected with second input of second NOR gate.
Further; The length-width ratio of said the 3rd NMOS pipe and the 4th NMOS pipe equates; The length-width ratio of said the 5th NMOS pipe and the 6th NMOS pipe equates; The electric current that first current source in first oscillating unit and second current source provide equates that the electric current that first current source in second oscillating unit and second current source provide equates.
Further; Said oscillator also comprises a calibrating signal generation module; With reference to the target low frequency signal generation calibrating signal of high-frequency signal and oscillator output, said calibrating signal is used to calibrate the electric current of the resistance that produces the reference peak threshold voltage described in first oscillating unit and second oscillating unit, the electric capacity that produces comparative voltage or the output of first current source with the export target low frequency signal through relatively for it.
According to a further aspect in the invention; The present invention also provides a kind of high precision oscillator; It comprises first oscillating unit and second oscillating unit; Wherein two oscillating units are shared a resistance that produces the reference peak threshold voltage, and each oscillating unit also comprises the comparison circuit and the charge/discharge control circuit of the electric capacity, first current source, more said reference peak threshold voltage and the said comparative voltage that produce a comparative voltage; The electric current that provides based on first current source of first oscillating unit charges to the electric capacity of first oscillating unit; The comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit be during more than or equal to said reference peak threshold voltage, and the charge/discharge control circuit of notifying the charge/discharge control circuit of first oscillating unit to begin to discharge with second oscillating unit stops discharge; The electric current that provides based on first current source of second oscillating unit charges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to said reference peak threshold voltage, and the charge/discharge control circuit of notifying the charge/discharge control circuit of second oscillating unit to begin to discharge with first oscillating unit stops discharge.
Further, said first oscillating unit and second oscillating unit are shared a logical circuit, and said logical circuit comprises first NOR gate and second NOR gate, and each oscillating unit also comprises second current source,
Comparison circuit in said first oscillating unit comprises the 3rd NMOS pipe, the 4th NMOS pipe and first inverter; Charge/discharge control circuit in first oscillating unit comprises NMOS pipe, a termination voltage of second current source in first oscillating unit wherein, the drain electrode of another termination the 3rd NMOS pipe; The resistance that is connected generation reference peak threshold voltage in first oscillating unit between the source electrode of said the 3rd NMOS pipe and the ground; One termination voltage of first current source in first oscillating unit, the drain electrode of another termination the 4th NMOS pipe is connected the electric capacity of generation comparative voltage in first oscillating unit between the source electrode of said the 4th NMOS pipe and the ground; The 3rd NMOS pipe is connected with the grid of the 4th NMOS pipe; The one NMOS pipe is parallelly connected with the electric capacity of generation comparative voltage in second oscillating unit, and the drain electrode of the 4th NMOS pipe connects the input of first inverter
Comparison circuit in said second oscillating unit comprises the 6th NMOS pipe and second inverter; Charge/discharge control circuit in second oscillating unit comprises the 2nd NMOS pipe; A termination voltage of first current source in second oscillating unit wherein, the drain electrode of another termination the 6th NMOS pipe is connected the electric capacity of generation comparative voltage in first oscillating unit between the source electrode of said the 6th NMOS pipe and the ground; Node between second current source and the 3rd NMOS manage in the grid of the 6th NMOS pipe and said first oscillating unit is connected; The 2nd NMOS pipe is parallelly connected with the electric capacity of generation comparative voltage in second oscillating unit, and the drain electrode of the 6th NMOS pipe connects the input of second inverter
The output of first inverter is connected with the first input end of first NOR gate; The grid of the one NMOS pipe is connected with second input of first NOR gate and the output of second NOR gate; The output of first NOR gate is connected with the grid of the 2nd NMOS pipe and the first input end of second NOR gate, and the output of second inverter is connected with second input of second NOR gate.
Further, the length-width ratio of said the 3rd NMOS pipe, the 4th NMOS pipe and the 5th NMOS pipe equates that all the electric current that first current source in first current source in first oscillating unit, second current source and second oscillating unit provides all equates.
Further; Said oscillator also comprises a calibrating signal generation module; With reference to the target low frequency signal generation calibrating signal of high-frequency signal and oscillator output, said calibrating signal is used to calibrate the electric current of the resistance that produces the reference peak threshold voltage described in first oscillating unit and second oscillating unit, the electric capacity that produces comparative voltage or the output of first current source with the export target low frequency signal through relatively for it.
In accordance with a further aspect of the present invention; The present invention also provides a kind of high precision oscillator; It comprises first oscillating unit and second oscillating unit, and wherein each oscillating unit comprises the resistance that produces the reference peak threshold voltage, comparison circuit and the charging control circuit that produces electric capacity, current source, more said reference peak threshold voltage and the said comparative voltage of a comparative voltage; The electric current that provides based on the current source of first oscillating unit discharges to the electric capacity of first oscillating unit; When the comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit was less than or equal to the reference peak threshold voltage in first oscillating unit, the charging control circuit of notifying the charging control circuit of first oscillating unit to begin to charge with second oscillating unit stopped charging; The electric current that provides based on the current source of second oscillating unit discharges to the electric capacity of second oscillating unit; When the comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit was less than or equal to the reference peak threshold voltage in second oscillating unit, the charging control circuit of notifying the charging control circuit of second oscillating unit to begin to charge with first oscillating unit stopped charging.
According to one side more of the present invention; The present invention also provides a kind of high precision oscillator; It comprises first oscillating unit and second oscillating unit; Wherein two oscillating units are shared a resistance that produces the reference peak threshold voltage, and each oscillating unit also comprises the comparison circuit and the charging control circuit of the electric capacity, current source, more said reference peak threshold voltage and the said comparative voltage that produce a comparative voltage; The electric current that provides based on the current source of first oscillating unit discharges to the electric capacity of first oscillating unit; When the comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit was less than or equal to said reference peak threshold voltage, the charging control circuit of notifying the charging control circuit of first oscillating unit to begin to charge with second oscillating unit stopped charging; The electric current that provides based on the current source of second oscillating unit discharges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to said reference peak threshold voltage, and the charging control circuit of notifying the charging control circuit of second oscillating unit to begin to charge with first oscillating unit stops charging.
Compared with prior art, oscillator provided by the invention can produce one not influenced by capacitor discharge time frequency signal, thereby obtain high-precision output frequency signal.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention; The accompanying drawing of required use is done to introduce simply in will describing embodiment below; Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills; Under the prerequisite of not paying creative work property, can also obtain other accompanying drawing according to these accompanying drawings.Wherein:
Fig. 1 is the structural representation of high precision oscillator among the present invention;
Fig. 2 is oscillation module able to programme circuit diagram in one embodiment among the present invention;
Fig. 3 is the oscillator signal of first electric capacity among Fig. 2, the oscillator signal of second electric capacity and the contrast sketch map of the corresponding target low frequency signal that produces; With
Fig. 4 is oscillation module able to programme circuit diagram in another embodiment among the present invention.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical scheme of the present invention through program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the present invention then possibly still can realize.Affiliated those of skill in the art use these descriptions here and state that the others skilled in the art in affiliated field effectively introduce their work essence.In other words, be the object of the invention of avoiding confusion, because the understanding easily of method of knowing and program, so they are not described in detail.
Alleged here " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment.In addition, represent that the sequence of modules and revocable in method, flow chart or the functional block diagram of one or more embodiment refers to any particular order, also be not construed as limiting the invention." connection " in this specification comprises direct connection, also comprises indirect connection; " some " or " several " in the literary composition are meant two or more.
Fig. 1 is the structural representation of high precision oscillator among the present invention, and said oscillator 100 comprises first oscillating unit 110 and second oscillating unit 120, through two oscillating units to obtain accurate frequency signal.
Said first oscillating unit 110 and second oscillating unit 120 all can comprise the resistance that produces the reference peak threshold voltage, comparison circuit and the charge/discharge control circuit that produces electric capacity, first current source, more said reference peak threshold voltage and the said comparative voltage of a comparative voltage; The electric current that wherein provides based on first current source of first oscillating unit charges to the electric capacity of first oscillating unit; The comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit be during more than or equal to the said reference peak threshold voltage in first oscillating unit, and the charge/discharge control circuit of notifying the charge/discharge control circuit of first oscillating unit to begin to discharge with second oscillating unit stops discharge; The electric current that provides based on first current source of second oscillating unit charges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to the reference peak threshold voltage in first oscillating unit, and the charge/discharge control circuit of notifying the charge/discharge control circuit of second oscillating unit to begin to discharge with first oscillating unit stops discharge.
In other words; When the charge/discharge control circuit of wherein first oscillating unit begins to discharge; The charge/discharge control circuit of second oscillating unit is in and stops discharge condition; Said current source in second oscillating unit charges to the electric capacity that produces comparative voltage at this moment; The comparative voltage that obtains when electric capacity charging back in second oscillating unit is during more than or equal to the said reference peak threshold voltage in second oscillating unit, and the charge/discharge control circuit in the second corresponding oscillating unit begins discharge, and the charge/discharge control circuit of first oscillating unit was in and stopped discharge condition this moment; Said current source in first oscillating unit charges to the electric capacity of the generation comparative voltage in first oscillating unit at this moment; The comparative voltage that obtains when electric capacity charging back in first oscillating unit is during more than or equal to the said reference peak threshold voltage in first oscillating unit, and the charge/discharge control circuit in the first corresponding oscillating unit begins discharge, continues successively just can obtain an oscillator signal.
It should be noted that; Above-mentionedly saidly stop discharge and be meant that charge/discharge control circuit gets into the absence of discharge state; Promptly cannot the electricity on the said electric capacity discharged under this state; Saidly begin discharge and be meant that charge/discharge control circuit gets into discharge condition, promptly can discharge the electricity on the said electric capacity under this state.Certainly, said first oscillating unit 110 and second oscillating unit 120 can also be shared the resistance of same generation reference peak threshold voltage to simplify circuit, and it will be described in detail in Fig. 4.
By on can know: when the charge/discharge control circuit in one of them oscillating unit begins to discharge; Current source in another oscillating unit begins the electric capacity in its oscillating unit is charged; To finish be that charge/discharge control circuit in its oscillating unit is when beginning to discharge when the latter charges; The former then begins through the current source in its unit its electric capacity to be charged; So just, formed both and continued the situation of charging each other, the cycle of the existing said frequency signal that only needs export is arranged to the time of both chargings and gets final product.So only need control said two current sources and just can control the frequency of the frequency signal of output to the time of its electric capacity charging.That is to say that the frequency of the said frequency signal of output is only relevant to the charging interval of electric capacity charging with said current source, and irrelevant to the discharge time of capacitor discharge with charge/discharge control circuit.Describe two kinds of implementations of said oscillator 100 in detail below in conjunction with Fig. 2-Fig. 4.
Fig. 2 is oscillator circuit diagram in one embodiment among the present invention; Said first oscillating unit comprises NMOS pipe MN1, the 3rd NMOS pipe MN3, the 4th NMOS pipe MN4, the first inverter INV1, the first current source I11, the second current source I12 and the first NOR gate NOR1, and second oscillating unit comprises the 2nd NMOS pipe MN2, the 5th NMOS pipe MN5, the 6th NMOS pipe MN6, the second inverter INV2, the first current source I11, the second current source I12 and the second NOR gate NOR2.
The termination voltage VDD of the said second current source I12 in first oscillating unit wherein; The said resistance R 1 that is used to produce the reference peak threshold voltage of connecting between the drain electrode of said the 3rd NMOS of another termination pipe MN3, the source electrode of the 3rd NMOS pipe MN3 and ground (below be called first resistance R 1); The termination voltage VDD of the said first current source I11 in first oscillating unit; The said capacitor C 1 that is used to produce comparative voltage of connecting between the drain electrode of said the 4th NMOS of another termination pipe MN4, the source electrode of the 4th NMO pipe MN4 and ground (below be called first capacitor C 1); The grid of the 3rd NMOS pipe MN3 is connected with the grid of the MN4 of its drain electrode and the 4th NMOS pipe; The termination voltage VDD of the second current source I22 in second oscillating unit; The said resistance R 2 that is used to produce the reference peak threshold voltage of connecting between the drain electrode of said the 5th NMOS of another termination pipe MN5, the source electrode of the 5th NMOS pipe MN5 and ground (below be called second resistance R 2); The termination voltage VDD of the first current source I21 in second oscillating unit; The said capacitor C 2 that is used to produce comparative voltage of connecting between the drain electrode of said the 6th NMOS of another termination pipe MN6, the source electrode of the 6th NMO pipe MN6 and ground (below be called second capacitor C 2); The grid of the 5th NMOS pipe MN5 is connected with the grid of the MN6 of its drain electrode and the 6th NMOS pipe; MN1 is parallelly connected with said first capacitor C 1 for the one NMOS pipe, and MN2 is parallelly connected with said second capacitor C 2 (being the electric capacity of above-mentioned generation one comparative voltage) for the 2nd NMOS pipe; The said first current source I11 in first oscillating unit is connected to the first input end 1 of the first NOR gate NOR1 through the said first inverter INV1; The grid of the one NMOS pipe MN3 connects the output of second input, 2, the first NOR gate NOR1 of the said first NOR gate NOR1 and exports said target low frequency signal LCK; The grid that the said first current source I21 in second oscillating unit is connected to second input, 2, the two NMOS pipe MN2 of the second NOR gate NOR2 through the said second inverter INV2 connects the first input end 1 of the said second NOR gate NOR2; The output of the said first NOR gate NOR1 also is connected with the first input end 1 of the said second NOR gate NOR2, and the output of the said second NOR gate NOR2 also is connected with second input 2 of the said first NOR gate NOR1; The input of the first inverter INV1 is connected on the node between the second electric current 11I and the 4th NMOS pipe MN4, and the input of the second inverter INV2 is connected on the node between the second current source I21 and the 6th NMOS pipe MN6.Wherein the signal of the output of first NOR gate NOR1 output is the frequency signal of said high precision oscillator output.
The 3rd NMOS in above-mentioned first oscillating unit pipe MN3 and the 4th NMOS pipe MN4 form comparison circuit with the reference peak threshold voltage that is used for comparison first resistance R 1 and the produces comparative voltage with 1 generation of first capacitor C; The one NMOS pipe MN1 forms charge/discharge control circuit, during reference peak threshold voltage that its comparative voltage that produces in first capacitor C 1 produces more than or equal to first resistance R 1 said first capacitor C 1 is discharged; And the 5th NMOS in second oscillating unit pipe MN5 and the 6th NMOS pipe MN6 form comparison circuit with the reference peak threshold voltage that is used for comparison second resistance R 2 and the produces comparative voltage with 2 generations of second capacitor C; The 2nd NMOS pipe MN2 forms charge/discharge control circuit, during reference peak threshold voltage that its comparative voltage that produces in second capacitor C 2 produces more than or equal to second resistance R 2 said second capacitor C 2 is discharged.
Hence one can see that, and the output of the first NOR gate NOR1 in the said logical circuit is controlled in the output of the comparison circuit in first oscillating unit, and then the conducting of MN2 and closure in the charge/discharge control circuit in may command second oscillating unit; The output of the second NOR gate NOR2 in the said logical circuit is controlled in the output of the comparison circuit in second oscillating unit, and then the conducting of MN1 and closure in the charge/discharge control circuit in may command first oscillating unit.Thereby realize function by comparison circuit control charge/discharge control circuit.Annexation by each element among Fig. 2 can be known; Suppose earlier first capacitor C 1 to be charged, when in a single day the voltage VC1 that detects first capacitor C 1 is charged to peak value, the A node of the first inverter INV1 output just uprises; The output signal LCK of the first NOR gate NOR1 (being the frequency signal of said high precision oscillator output) is from high step-down; Second capacitor C 2 begins charging, and before second capacitor C 2 was not charged to peak value, the B node of the output of the second inverter INV2 was a low level; Then the grid D point of NMOS pipe MN1 is a high level, and first capacitor C 1 is discharged.Specifically can be with reference to shown in Figure 3; Wherein VC1 is the voltage of first capacitor C 1, and VC2 is the voltage of second capacitor C 2, T1 between the first phase; The starting point of first capacitor C 1 T1 between the said first phase begins to be discharged to zero from its peak value, and keeps the terminal point of T1 between nought state to the said first phase; Simultaneously, the starting point of second capacitor C 2 T1 between the first phase begins charging from null value, and the terminal point of T1 charges to its peak value between the first phase.Subsequently, after said second capacitor C 2 was charged to peak value, said B point uprised from low; Said D point becomes low level, and a said C1 begins charging, before a said C1 charges to peak value; Said A point is a low level, and said frequency signal LCK is a high level, and second capacitor C 2 is discharged.Specifically can be with reference to shown in Figure 4, promptly at second phase T2, said first capacitor C 1 begins charging in the starting point of said second phase T2 from null value, charges to its peak value at the terminal point of second phase T2; Simultaneously, said second capacitor C 2 begins to be discharged to zero in the starting point of second phase T2 from peak value, and keeps the terminal point of nought state to second phase T2.Again subsequently, when the voltage VC1 of first capacitor C 1 was charged to peak value, said A node just uprised, and went round and began again like this, and oscillator just vibration gets up.
During T1, said frequency signal LCK is a low level between the said first phase, and when follow-up second phase T2, said frequency signal LCK is a high level.Can find out that T1 and second phase T2 have constituted the one-period of frequency signal LCK between the said first phase.When first capacitor C 1 and second capacitor C 2 ceaselessly alternately discharge and recharge, it will be the target low frequency signal of T1+T2 in the output cycle.
In the present invention; If ignore delay and logical circuit (INV1, INV2, the NOR1 of comparator; NOR2) time of delay; Equal the charging interval (being T1) of first capacitor C 1 and charging interval (the being T2) sum of second capacitor C 2 cycle of oscillation of oscillator, have nothing to do, so just improved precision cycle of oscillation of oscillator with the discharge time of first capacitor C 1 and the discharge time of second capacitor C 2.If the breadth length ratio of the 3rd NMOS pipe MN3 and the 4th NMOS pipe MN4 equates that the breadth length ratio of the 5th NMOS pipe MN5 and the 6th NMOS pipe MN6 equates that the electric current that the first current source I11 in first oscillating unit and the second current source I12 provide equates; The electric current that the first current source I21 in second oscillating unit and the second current source I22 provide equates; Then in first capacitor C, 1 charging process, the voltage on it is from zero director I11R1, and the electric charge of first capacitor C, 1 charging during this period of time is Q1=I12R1C1; Corresponding charging current is I11; So the charging interval T1=Q1/I2=I12R1C1/I1 of first capacitor C 1, so I11=I12 wherein is T1=R1C1; In like manner, the charging interval T2=R2C2 of second capacitor C 2, be T=T1+T2=R1C1+R2C2 the cycle of oscillation of oscillator.Wherein, R1 is the resistance value of first resistance R 1, and C1 is the capacitance of first capacitor C 1, and R2 is the resistance value of second resistance R 2, and C2 is the capacitance of second capacitor C 2.
Hence one can see that, and the cycle of said frequency signal LCK is only relevant with the resistance value of the resistance value of the capacitance of the capacitance of said first capacitor C 1, second capacitor C 2, first resistance R 1 and second resistance R 2.
Except the circuit of a kind of oscillation module able to programme shown in Fig. 2, the present invention also provides a kind of circuit of oscillation module able to programme of simplification, and is as shown in Figure 4.The difference of oscillator is among oscillator among Fig. 4 and Fig. 2: the oscillation module able to programme among this figure has saved second resistance R 2, the second current source I22 and the 5th NMOS pipe MN5, and the grid of the 3rd NMOS pipe MN6 (being the 6th NMOS pipe MN6 among Fig. 2) is directly connected to the grid of the 3rd NMOS pipe MN3.Like this, the grid voltage of MN3 is that MN4 provides voltage bias, and this voltage also can be used as the voltage bias of MN6.The operation principle of the oscillator among Fig. 4 is similar with the operation principle among Fig. 2; Only need the first current source I21, the first current source I11 in second oscillating unit, the second current source I12 that satisfy in second oscillating unit all to equate in the design; The length-width ratio of NMOS pipe MN3, MN4 and MN6 all equates to get final product; And can get thus: T1=R1C1, T2=(I1R1) C2/I4=R1C2.
Above-mentioned Fig. 4 and Fig. 6 illustrate two metal-oxide-semiconductors in the comparison circuit described in the oscillating unit and are the NMOS pipe; When it is realized in reality; Can also adopt PMOS to manage realizes; As said MN1 being replaced with PMOS pipe MP1, said MN2 is replaced with PMOS pipe MP2, said MN3, MN4, MN5 and MN6 are replaced with PMOS pipe MP3, MP4, MP5 and MP6 respectively.Accordingly, the circuit among Fig. 4 becomes: produce terminating on the voltage VDD of first resistance R 1 of reference peak threshold voltage in first oscillating unit, the other end is connected on the source electrode of MP3, and the said second current source I12 connects between the drain electrode of MP3 and the ground; One of first capacitor C 1 of generation comparative voltage terminates on the voltage VDD in first oscillating unit; The other end is connected on the source electrode of MP4; The said first current source I11 that connects between the drain electrode of MP4 and the ground, the current direction of the said first current source I11 and the second current source I12 points to ground; MP1 is parallelly connected with said first capacitor C 1; The grid of MP3 is connected with the grid of MP4; Produce terminating on the voltage VDD of second resistance R 2 of reference peak threshold voltage in second oscillating unit, the other end is connected on the source electrode of MP5, and the said second current source I22 connects between the drain electrode of MP5 and the ground; One of second capacitor C 2 of generation comparative voltage terminates on the voltage VDD in second oscillating unit; The other end is connected on the source electrode of MP6; The said first current source I21 that connects between the drain electrode of MP6 and the ground, the current direction of the said second current source I22 and the first current source I21 points to ground; MP2 is parallelly connected with said second capacitor C 2; The grid of MP5 is connected with the grid of MP6.Remaining element as the connection of the first inverter INV1, the first NOR gate NOR1, the second inverter INV2 and the second NOR gate NOR2 all with Fig. 4 in connect identical.
After adopting the PMOS pipe, the MP3 in said first oscillating unit, MP4 and the first inverter INV1 form comparison circuit with the reference peak threshold voltage that is used for comparison first resistance R 1 and the produces comparative voltage with 1 generation of first capacitor C; MP1 forms charging control circuit, and the charging control circuit when it is less than or equal to the reference peak threshold voltage of first resistance R, 1 generation at the comparative voltage that first capacitor C 1 produces in first oscillating unit charges to said first capacitor C 1; And MP5 in second oscillating unit, MP6 and the second inverter INV2 form comparison circuit with the reference peak threshold voltage that is used for comparison second resistance R 2 and the produces comparative voltage with 2 generations of second capacitor C; MP2 forms charge/discharge control circuit, and the charging control circuit when it is less than or equal to the reference peak threshold voltage of second resistance R, 2 generations at the comparative voltage that second capacitor C 2 produces in second oscillating unit charges to said second capacitor C 2; And the first NOR gate NOR1 and the second NOR gate NOR2 constitute the logical circuit that two oscillating units are shared.
Hence one can see that, and when adopting the PMOS pipe, the output of the first NOR gate NOR1 in the said logical circuit is controlled in the output of the comparison circuit in first oscillating unit, and then the conducting of MN2 and closure in the charging control circuit in may command second oscillating unit; The output of the second NOR gate NOR2 in the said logical circuit is controlled in the output of the comparison circuit in second oscillating unit, and then the conducting of MN1 and closure in the charging control circuit in may command first oscillating unit.Thereby realize, by the function of comparison circuit control charging control circuit.
Certainly, corresponding to Fig. 6, can adopt the existing NMOS pipe of PMOS pipe replacement too, its principle and above-mentioned similar just repeats no more here.Compare with traditional oscillators technology, the cycle of the target low frequency signal of the present invention's output can not receive the influence of capacitor discharge time in it, thereby makes that the target low frequency signal of output is more accurate.
In concrete the application; In Bluetooth system; Usually can require a high frequency crystal oscillator and a low frequency crystal oscillator to use simultaneously to obtain high-frequency signal and low-frequency signals; And because the crystal price comparison is high, so, can produce an accurate target low frequency signal through high frequency crystal oscillator in order to save crystal.It realizes that thought is: in above-mentioned oscillator, add a calibrating signal generation module; It can be more said among high-frequency signal and the present invention of high frequency crystal oscillator output the low frequency signal of oscillator output produce calibrating signal; Utilize said calibrating signal that the resistance of the said generation reference peak threshold voltage in said first oscillating unit and second oscillating unit, the electric capacity and the current source of generation comparative voltage are calibrated, then can the high target low frequency signal of output prograin.Usually, said calibrating signal can adopt various coded system of the prior art, like thermometer code, Gray code, complement code etc.Obtain calibrating signal a kind of the most general method can for: said calibrating signal generation module is counted with reference to high-frequency signal said in the one-period of said target low frequency signal, confirms said calibrating signal according to the difference of count value that counts to get and standard value.
In one embodiment, for the ease of understanding, this data mode of sentencing the conventional belt sign bit is described said calibrating signal, but principle of the present invention is applicable to various coding techniquess.Can suppose that D0 is a sign bit, high frequency clock HCK frequency is 64MHz, and the low-frequency clock target frequency is 32KHz, and said calibrating signal generation module 110 can produce said calibrating signal through the counting form.For the one-period of 32KHz frequency accurately; Need the just in time HCK cycle of full 2000 (standard value in this example) 64MHz of meter; If counting surpasses 2000 cycles, show that then the LCK cycle is long partially, can be made as 0 with D0; Show to reduce the LCK cycle, D1-Dn be set as reduce the LCK cycle what the step.If the adjustment step-length is 0.5%, the binary number that D1-Dn constitutes is 40, and then the cycle is shortened 0.5% * (2
n-40).Otherwise, if counting shows then that less than 2000 cycles the LCK cycle is short partially, can D0 be made as 1, showing needs to increase the LCK cycle, and D1-Dn is set as increases LCK cycle step number.If the adjustment step-length is 0.5%, the binary number that D1-Dn constitutes is 40, and then the cycle is increased 0.5% * 40=20%, promptly is increased to 120%.Because it can both be realized for the those of ordinary skill in affiliated field, so just no longer detail here.
Accordingly; In order to make said calibrating signal to control to the said resistance (promptly producing the resistance of reference peak threshold voltage in first oscillating unit in the resistance of generation reference peak threshold voltage or second oscillating unit) that produces the reference peak threshold voltage; Said resistance can be designed as the form of several resistance unit series connection; In some or all resistance units each all with a switch in parallel, according to the conducting of each switch of said calibrating signal control or end the resistance value of adjusting said resistance; In order to make said calibrating signal to control to the said electric capacity that discharges and recharges repeatedly (being to produce the electric capacity that produces the reference peak threshold voltage in electric capacity or second oscillating unit of comparative voltage in above-mentioned first oscillating unit); Can said electric capacity be arranged to the form of several capacitor cell parallel connections; In some or all capacitor cells each all connected with a switch, controls the conducting of each switch or ends the capacitance of adjusting said electric capacity according to said calibrating signal; Similarly; The size of the electric current of said current source (like first current source in above-mentioned first oscillating unit and second oscillating unit and the second current source) output that in can also adjusting according to said calibrating signal electric capacity is discharged and recharged; The branch road that produces electric current also can be arranged to it to be similar to the parallel form of electric capacity; The switch of on part or all of current branch, connecting respectively, each switch is controlled by said calibrating signal.In view of the above, just can programme needing to obtain the target low frequency signal of precision to resistance, the electric capacity that produces comparative voltage that produces the reference peak threshold voltage in said first oscillating unit and second oscillating unit, the current source that carries out charge or discharge through said calibrating signal.
In sum, oscillator provided by the invention can export one not influenced by capacitor discharge time frequency signal, accuracy is higher.
Above-mentioned explanation has fully disclosed embodiment of the present invention.It is pointed out that any change that technical staff's specific embodiments of the invention of being familiar with this field is done does not all break away from the scope of claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (10)
1. high precision oscillator; It is characterized in that; It comprises first oscillating unit and second oscillating unit; Wherein each oscillating unit comprises the resistance that produces the reference peak threshold voltage, comparison circuit and the charge/discharge control circuit that produces electric capacity, first current source, more said reference peak threshold voltage and the said comparative voltage of a comparative voltage
The electric current that provides based on first current source of first oscillating unit charges to the electric capacity of first oscillating unit; The comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit is during more than or equal to the reference peak threshold voltage in first oscillating unit; The charge/discharge control circuit of notifying the charge/discharge control circuit of first oscillating unit to begin to discharge with second oscillating unit stops discharge
The electric current that provides based on first current source of second oscillating unit charges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to the reference peak threshold voltage in first oscillating unit, and the charge-discharge control circuit of notifying the charge/discharge control circuit of second oscillating unit to begin to discharge with first oscillating unit stops discharge.
2. high precision oscillator according to claim 1 is characterized in that: said first oscillating unit and second oscillating unit are shared a logical circuit, and said logical circuit comprises first NOR gate and second NOR gate, and each oscillating unit also comprises second current source,
Comparison circuit in said first oscillating unit comprises the 3rd NMOS pipe, the 4th NMOS pipe and first inverter; Charge/discharge control circuit in first oscillating unit comprises NMOS pipe; A termination voltage of second current source in first oscillating unit wherein; The resistance that is connected generation reference peak threshold voltage in first oscillating unit between the drain electrode of another termination the 3rd NMOS pipe, the source electrode of said the 3rd NMOS pipe and ground, a termination voltage of first current source in first oscillating unit; The drain electrode of another termination the 4th NMOS pipe; Is connected the electric capacity that produces comparative voltage in first oscillating unit between the source electrode of said the 4th NMOS pipe and the ground, the 3rd NMOS pipe is connected with the grid of the 4th NMOS pipe, and a NMOS manages parallelly connected with the said electric capacity of generation comparative voltage in first oscillating unit; The drain electrode of the 4th NMOS pipe connects the input of first inverter
Comparison circuit in said second oscillating unit comprises the 5th NMOS pipe, the 6th NMOS pipe and second inverter; Charge/discharge control circuit in second oscillating unit comprises the 2nd NMOS pipe; A termination voltage of second current source in second oscillating unit wherein, the drain electrode of another termination the 5th NMOS pipe is connected the resistance of generation reference peak threshold voltage in second oscillating unit between the source electrode of said the 5th NMOS pipe and the ground; One termination voltage of first current source in second oscillating unit; Is connected the electric capacity that produces comparative voltage in second oscillating unit between the drain electrode of another termination the 6th NMOS pipe, the source electrode of said the 6th NMOS pipe and ground, the 2nd NMOS pipe is parallelly connected with the said electric capacity of generation comparative voltage in second oscillating unit; The drain electrode of the 6th NMOS pipe connects the input of second inverter
The output of first inverter is connected with the first input end of first NOR gate; The grid of the one NMOS pipe is connected with second input of first NOR gate and the output of second NOR gate; The output of first NOR gate is connected with the grid of the 2nd NMOS pipe and the first input end of second NOR gate, and the output of second inverter is connected with second input of second NOR gate.
3. according to the said high precision oscillator of claim 2; It is characterized in that: the length-width ratio of said the 3rd NMOS pipe and the 4th NMOS pipe equates; The length-width ratio of said the 5th NMOS pipe and the 6th NMOS pipe equates; The electric current that first current source in first oscillating unit and second current source provide equates that the electric current that first current source in second oscillating unit and second current source provide equates.
4. according to the arbitrary described high precision oscillator of claim 1-3; It is characterized in that: said oscillator also comprises a calibrating signal generation module; With reference to the target low frequency signal generation calibrating signal of high-frequency signal and oscillator output, said calibrating signal is used to calibrate the electric current of the resistance that produces the reference peak threshold voltage described in first oscillating unit and second oscillating unit, the electric capacity that produces comparative voltage or the output of first current source with the export target low frequency signal through relatively for it.
5. high precision oscillator; It is characterized in that; It comprises first oscillating unit and second oscillating unit; Wherein two oscillating units are shared a resistance that produces the reference peak threshold voltage, and each oscillating unit also comprises the comparison circuit and the charge/discharge control circuit of the electric capacity, first current source, more said reference peak threshold voltage and the said comparative voltage that produce a comparative voltage
The electric current that provides based on first current source of first oscillating unit charges to the electric capacity of first oscillating unit; The comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit is during more than or equal to said reference peak threshold voltage; The charge/discharge control circuit of notifying the charge/discharge control circuit of first oscillating unit to begin to discharge with second oscillating unit stops discharge
The electric current that provides based on first current source of second oscillating unit charges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to said reference peak threshold voltage, and the charge/discharge control circuit of notifying the charge/discharge control circuit of second oscillating unit to begin to discharge with first oscillating unit stops discharge.
6. high precision oscillator according to claim 5 is characterized in that:
Said first oscillating unit and second oscillating unit are shared a logical circuit, and said logical circuit comprises first NOR gate and second NOR gate, and each oscillating unit also comprises second current source,
Comparison circuit in said first oscillating unit comprises the 3rd NMOS pipe, the 4th NMOS pipe and first inverter; Charge/discharge control circuit in first oscillating unit comprises NMOS pipe, a termination voltage of second current source in first oscillating unit wherein, the drain electrode of another termination the 3rd NMOS pipe; The resistance that is connected generation reference peak threshold voltage in first oscillating unit between the source electrode of said the 3rd NMOS pipe and the ground; One termination voltage of first current source in first oscillating unit, the drain electrode of another termination the 4th NMOS pipe is connected the electric capacity of generation comparative voltage in first oscillating unit between the source electrode of said the 4th NMOS pipe and the ground; The 3rd NMOS pipe is connected with the grid of the 4th NMOS pipe; The one NMOS pipe is parallelly connected with the electric capacity of generation comparative voltage in second oscillating unit, and the drain electrode of the 4th NMOS pipe connects the input of first inverter
Comparison circuit in said second oscillating unit comprises the 6th NMOS pipe and second inverter; Charge/discharge control circuit in second oscillating unit comprises the 2nd NMOS pipe; A termination voltage of first current source in second oscillating unit wherein, the drain electrode of another termination the 6th NMOS pipe is connected the electric capacity of generation comparative voltage in first oscillating unit between the source electrode of said the 6th NMOS pipe and the ground; Node between second current source and the 3rd NMOS manage in the grid of the 6th NMOS pipe and said first oscillating unit is connected; The 2nd NMOS pipe is parallelly connected with the electric capacity of generation comparative voltage in second oscillating unit, and the drain electrode of the 6th NMOS pipe connects the input of second inverter
The output of first inverter is connected with the first input end of first NOR gate; The grid of the one NMOS pipe is connected with second input of first NOR gate and the output of second NOR gate; The output of first NOR gate is connected with the grid of the 2nd NMOS pipe and the first input end of second NOR gate, and the output of second inverter is connected with second input of second NOR gate.
7. high precision oscillator according to claim 6; It is characterized in that: the length-width ratio of said the 3rd NMOS pipe, the 4th NMOS pipe and the 5th NMOS pipe equates that all the electric current that first current source in first current source in first oscillating unit, second current source and second oscillating unit provides all equates.
8. according to the arbitrary described high precision oscillator of claim 5-7; It is characterized in that: said oscillator also comprises a calibrating signal generation module; With reference to the target low frequency signal generation calibrating signal of high-frequency signal and oscillator output, said calibrating signal is used to calibrate the electric current of the resistance that produces the reference peak threshold voltage described in first oscillating unit and second oscillating unit, the electric capacity that produces comparative voltage or the output of first current source with the export target low frequency signal through relatively for it.
9. high precision oscillator; It is characterized in that; It comprises first oscillating unit and second oscillating unit; Wherein each oscillating unit comprises the resistance that produces the reference peak threshold voltage, comparison circuit and the charging control circuit that produces electric capacity, current source, more said reference peak threshold voltage and the said comparative voltage of a comparative voltage
The electric current that provides based on the current source of first oscillating unit discharges to the electric capacity of first oscillating unit; When the comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit is less than or equal to the reference peak threshold voltage in first oscillating unit; The charging control circuit of notifying the charging control circuit of first oscillating unit to begin to charge with second oscillating unit stops charging
The electric current that provides based on the current source of second oscillating unit discharges to the electric capacity of second oscillating unit; When the comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit was less than or equal to the reference peak threshold voltage in second oscillating unit, the charging control circuit of notifying the charging control circuit of second oscillating unit to begin to charge with first oscillating unit stopped charging.
10. high precision oscillator; It is characterized in that; It comprises first oscillating unit and second oscillating unit; Wherein two oscillating units are shared a resistance that produces the reference peak threshold voltage, and each oscillating unit also comprises the comparison circuit and the charging control circuit of the electric capacity, current source, more said reference peak threshold voltage and the said comparative voltage that produce a comparative voltage
The electric current that provides based on the current source of first oscillating unit discharges to the electric capacity of first oscillating unit; When the comparative voltage of the comparison circuit of first oscillating unit in first oscillating unit is less than or equal to said reference peak threshold voltage; The charging control circuit of notifying the charging control circuit of first oscillating unit to begin to charge with second oscillating unit stops charging
The electric current that provides based on the current source of second oscillating unit discharges to the electric capacity of second oscillating unit; The comparative voltage of the comparison circuit of second oscillating unit in second oscillating unit be during more than or equal to said reference peak threshold voltage, and the charging control circuit of notifying the charging control circuit of second oscillating unit to begin to charge with first oscillating unit stops charging.
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Application publication date: 20120328 |