CN1710804A - Oscillator - Google Patents
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- CN1710804A CN1710804A CN 200410059349 CN200410059349A CN1710804A CN 1710804 A CN1710804 A CN 1710804A CN 200410059349 CN200410059349 CN 200410059349 CN 200410059349 A CN200410059349 A CN 200410059349A CN 1710804 A CN1710804 A CN 1710804A
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Abstract
Operation in the disclosed oscillating circuit is as follows. Voltage control type current source outputs a drive current and an equivalent current of oscillator. Signal oscillating circuit outputs first source oscillating signal and second source oscillating signal. Differential amplifier outputs first amplified oscillating signal and second amplified oscillating signal. First switching circuit and second switching circuit output first current oscillating signal and second current oscillating signal respectively. Transform amplifying circuit of first current value is in use for transforming value of first current oscillating signal; and transform amplifying circuit of second current value is in use for transforming value of second current oscillating signal into their final output current. The adder outputs the driving current of amplifier, which is summation between the equivalent current of oscillator and transformed equivalent current, to differential amplifier.
Description
Technical field
The present invention relates to oscillating circuit, particularly the frequency of oscillation oscillating circuit that can change.
Background technology
The oscillating circuit of voltage-controlled type, for example be used in that light picks up and PLL (Phase LockedLoop) in, in general frequency of oscillation is changed and sets, the signal of this frequency of oscillation of vibration output according to the control voltage that applies.An example of voltage-controlled oscillator of the prior art is that reversal amplifier, the 1st charge-discharge circuit, the 2nd charge-discharge circuit are connected as a succession of.In this structure, postpone from phase place stage ground in the 1st charge-discharge circuit and the 2nd charge-discharge circuit of the reversal voltage signal of reversal amplifier, the output of further the 2nd charge-discharge circuit is input to reversal amplifier once more.Because it is identical once more with originally phase place that the phase place of the reversal voltage signal of circulation primary becomes, so voltage-controlled oscillator can continue vibration by carrying out above processing repeatedly.And, the frequency of oscillation of voltage-controlled oscillator mainly decides according to the size of the charging and discharging currents of the 1st charge-discharge circuit and the 2nd charge-discharge circuit, and the size of charging and discharging currents is to control by having than the big current value level of charging and discharging currents and the Control current of control easily.
List of references: the spy opens flat 6-37599 communique
In technology in the past, even charging and discharging currents is very little, because control, so by the stable current value level that is used to control, even in low frequency of oscillation, also can carry out stable vibration by Control current.On the other hand, in general, in high oscillation frequency, need the further following problem of research.Oscillator signal at the vibration high oscillation frequency, and by field-effect transistor (FET:Fieldeffect transistor) when amplifying this oscillator signal (following this FET is called " amplify and use FET "), if amplify little with the electric current that flows through among the FET, oscillator signal then amplifies and uses the responsiveness of FET slack-off, so consequently can not fully be amplified.But, for fully amplifying, the oscillator signal with high oscillation frequency increases when amplifying with the electric current that flows through among the FET, replacing under the situation of oscillator signal that high oscillation frequency amplifies low frequency of oscillation, consume above essential electric power.
On the other hand, as oscillating circuit being built in the supplier who provides among LSI (Large Scale Intergrated circuit) etc.,, wish that this LSI can use generally for the effect that obtains producing in batches.And, LSI is assembled in user in the device etc., in the frequency of oscillation of in device, setting, need the signal output of sufficient amplitude, and wish with the low consumption work about electric power.In oscillating circuit, wish in the scope of wide frequency of oscillation, to make the characteristic of signal output and consumption electric power etc. suitable for this reason.Particularly oscillating circuit is applied in the device of regulation, in the use of this device, when setting frequency of oscillation according to the rules changes, need satisfies the necessary condition of signal being exported and consuming the regulation of electric power for each frequency of oscillation the user.
Summary of the invention
The inventor recognizes such situation and proposes the present invention, and its objective is provides a kind of oscillating circuit, and corresponding frequency of oscillation produces the characteristic of good oscillator signal, reduces consuming electric power.
A kind of form of the present invention is an oscillating circuit.This oscillating circuit comprises differential-type oscillator signal generative circuit, can set the frequency of oscillation of oscillator signal, and the oscillator signal of having set frequency of oscillation is exported as differential wave; Differential amplifier, differential amplification is as the oscillator signal of differential wave output; The conversion amplifying circuit is electric current and amplifies the voltage transformation of the oscillator signal of differential amplification; The interdependent type of frequency is adjusted circuit, according to the setting content of differential-type oscillator signal generative circuit, adjusts the operating characteristics of differential amplifier.
The magnification ratio of " differential amplifier " according to circuit just suitably set can, for example can be made as the situation that comprises that magnification ratio is bigger than " 1 ", magnification ratio is the situation and the magnification ratio situation littler than " 1 " of " 1 ".
" setting content " though the expression setting relevant with frequency of oscillation, this setting also can be to produce according to current value and magnitude of voltage or other signal.
In differential-type oscillator signal generative circuit, also can be when having set the frequency of oscillation of oscillator signal than the highland, the interdependent type of frequency is adjusted the responsiveness that circuit improves differential generator.
" setting than the highland " though be to form according to the size of magnitude of voltage and current value or the signal of regulation, also can be the setting that frequency of oscillation is uprised.
Because by above oscillating circuit, can adjust the operating characteristics of differential amplifier according to the frequency of oscillation of oscillator signal, so if frequency of oscillation uprises, then differential amplifier moves more at high speed, can export the oscillator signal of high oscillation frequency.And, because handle the signal of differential-type, so even the deformation component of signal also is cancelled in high oscillation frequency, the deformation component of signal is reduced.
Differential-type oscillator signal generative circuit can comprise: the differential-type circular type shaker; Drive circuit, to the differential-type circular type shaker, according to the setting content incoming flow electric current of overdriving, the interdependent type of frequency is adjusted circuit and is made the electric current that flows through corresponding drive current in the differential amplifier, makes the differential amplifier action.
Another kind of form of the present invention also is an oscillating circuit.This oscillating circuit comprises: differential-type oscillator signal generative circuit, the oscillator signal of regulation is exported as differential wave; Differential amplifier, differential amplification is as the oscillator signal of differential wave output; The conversion amplifying circuit is electric current and amplifies the voltage transformation of the oscillator signal of differential amplification; Initialization circuit, the conversion characteristics of setting conversion amplifying circuit; Export interdependent type and adjust circuit, adjust the operating characteristics of differential amplifier according to the setting content of initialization circuit.
In initialization circuit, when setting the voltage transformation be used for oscillator signal significantly and be the electric current of electric current, export interdependent type and adjust the responsiveness that circuit can improve differential amplifier.
Because by above oscillating circuit, can be that the operating characteristics of differential amplifier is adjusted in the setting of electric current according to being used for voltage transformation with oscillator signal, so, can strengthen the electric current of oscillator signal and export for example by the high speed motion of differential amplifier.
Have, such summing up of the present invention needn't be described all essential features again, so that the present invention also can come time associating (sub-combination) by these features that are described.
Description of drawings
Fig. 1 is the figure of the high-frequency oscillating circuits of expression execution mode 1.
Fig. 2 is the figure of output signal of the amplifier of presentation graphs 1.
Fig. 3 is the figure that is illustrated in the conversion amplifying circuit of Fig. 1 by the output current of voltage transformation.
Fig. 4 is the figure of the high-frequency oscillating circuits of expression execution mode 2.
Fig. 5 (a) is the figure of application examples of the high-frequency oscillating circuits of expression execution mode 3 to Fig. 5 (c).
Embodiment
Followingly describe the present invention, but these preferred embodiments are only as example of the present invention, and are not used for limiting protection scope of the present invention according to preferred embodiment.For the present invention, all features of Miao Shuing and combination thereof might not be required in this invention in an embodiment.
Execution mode 1
Execution mode 1 is to be purpose with the versatility about the producer, make to make the oscillator signal of frequency of oscillation of wide region that can vibrate, and to be set with the user is to be the high-frequency oscillating circuits of prerequisite in the frequency of oscillation of regulation and the device that is assembled in regulation.The high-frequency oscillating circuits of present embodiment changes the frequency of oscillation of oscillator signal according to the control voltage that applies.If control voltage height then improve frequency of oscillation for example is if control voltage is low then reduce frequency of oscillation.And, by amplifying the amplitude that fully amplifies the voltage of oscillator signal with FET, and be electric current with the voltage transformation of the oscillator signal that is exaggerated.Particularly the high-frequency oscillating circuits of present embodiment if set control voltage than the highland, then makes to amplify and uses the electric current that flows among the FET to increase, and uses the FET high speed motion so can make to amplify under the high situation of frequency of oscillation.On the other hand, under the low situation of frequency of oscillation, the electric current that amplifies with flowing among the FET is tailed off, so can reduce consumption electric power.
Fig. 1 represents the high-frequency oscillating circuits 100 of execution mode 1.High-frequency oscillating circuits 100 comprises voltage controlled oscillation circuit 50, differential amplifier 52, conversion amplifying circuit 54, adder 56, voltage controlled oscillation circuit 50 comprises voltage-controlled type current source 58, signal oscillation circuit 60, and conversion amplifying circuit 54 comprises first switching circuit 62, second switch circuit 64, the first current value conversion amplifying circuit 66, second current value conversion amplifying circuit 68 and the constant-current source 70.And, comprise control voltage 306, oscillator drives electric current 308, the first source oscillator signal 310, the second source oscillator signal 312, the first amplification oscillator signal 314, the second amplification oscillator signal 316, conversion constant current 318, the first current oscillation signal 320, the second current oscillation signal 322, differential amplifier drive current 324, oscillator equivalent current 326 and conversion equivalent current 328 as signal.
Voltage-controlled type current source 58 applies control voltage 306, flows through big or small corresponding oscillator drives electric current 308 and oscillator equivalent current 326 with control voltage 306.Here, the size of oscillator drives electric current 308 and oscillator equivalent current 326 has proportionate relationship, and both become big along with the increase of control voltage 306.
The first source oscillator signal 310 and the second source oscillator signal 312 of the frequency of oscillation of the size of the corresponding oscillator drives electric current 308 of signal oscillation circuit 60 outputs.Specifically, if oscillator drives electric current 308 becomes big, then set frequency of oscillation than the highland.The first source oscillator signal 310 and the second source oscillator signal 312 though the maximum of making and minimum value occur repeatedly, in order to carry out differential processing and amplifying in differential amplifier 52 described later, constitute balanced signal for example as sinusoidal wave during certain.And, " balanced signal " expression differential wave, on the other hand, " balanced signal " is that expression is with the common signal as benchmark such as ground wire.
The 52 pairs first source oscillator signals 310 of differential amplifier and the second source oscillator signal 312 carry out differential processing and amplifying respectively, and output first is amplified oscillator signal 314 and second and amplified oscillator signal 316.And the purpose of carrying out differential processing and amplifying is the driving force that increases by first switching circuit 62 described later and second switch circuit 64.First amplifies oscillator signal 314 and second amplifies oscillator signal 316 and has the waveform identical with the second source oscillator signal 312 with the first source oscillator signal 310, constitutes balanced signal.And aforesaid amplification is included in the differential amplifier 52 with FET.
It is the conversion constant current 318 of electric current that constant-current source 70 is provided for first voltage transformation that amplifies the oscillator signal 314 and the second amplification oscillator signal 316.Here, conversion is defined as certain value with constant current 318, but also output and conversion has the conversion equivalent current 328 of proportionate relationship with constant current 318.
First switching circuit 62 amplifies oscillator signal 314 with first and is transformed to the first current oscillation signal 320.Here, if the value of the first amplification oscillator signal 314 is big, then the value of the first current oscillation signal 320 is near the value of conversion with constant current 318, and in addition, if the value of the first amplification oscillator signal 314 is little, then the value of the first current oscillation signal 320 becomes littler.Second switch circuit 64 also with the 62 the same actions of first switching circuit, amplify oscillator signal 316 with second and be transformed to the second current oscillation signal 322.
The value of the first current value conversion amplifying circuit, 66 conversion, the first current oscillation signal 320, the value of the second current value conversion amplifying circuit, 68 conversion, the second current oscillation signal 322.Here, corresponding (sink) electric current that absorbs of the value of the first current oscillation signal, 320 corresponding source (source) electric currents that are transformed, the second current oscillation signal 322 that is transformed, based on the switching of first switching circuit 62 and second switch circuit 64, absorption current and source electric current become the output current that is switched.Here, " output current " comprises " absorption current " and " source electric current ".
Adder 56 makes and has increased oscillator equivalent current 326 and conversion and flow to differential amplifier 52 with the differential amplifier drive current 324 of equivalent current 328.If differential amplifier drive current 324 becomes big, then the action of differential amplifier 52 becomes at a high speed.Promptly, even the first source oscillator signal 310 and the second source oscillator signal 312 are with higher frequency of oscillation change, because differential amplifier drive current 324 becomes big, the action of differential amplifier 52 also can be followed higher frequency of oscillation, and first amplitude that amplifies the oscillator signal 314 and the second amplification oscillator signal 316 becomes bigger.
Have again, though will in execution mode 2, be described in detail in the back for details, but because in differential amplifier drive current 324, also increase conversion equivalent current 328, so even first amplitude that amplifies the oscillator signal 314 and the second amplification oscillator signal 316 further becomes big, irrelevant with the value of constant current 318 with conversion, the amplitude of the first current oscillation signal 320 and the second current oscillation signal 322 also becomes big.
Fig. 2 is the first time variation of amplifying oscillator signal 314 of expression as the output signal of differential amplifier 52.Solid line among the figure is represented the situation that differential amplifier drive current 324 is enough big, and the dotted line among the figure is represented the situation that differential amplifier drive current 324 is little.If differential amplifier drive current 324 is big, then because the change of the first source oscillator signal 310 of high oscillation frequency can be fully followed in the action of differential amplifier 52, so first amplitude that amplifies oscillator signal 314 also becomes big.On the other hand, if differential amplifier drive current 324 is little, then the change of the first source oscillator signal 310 can not be fully followed in the action of differential amplifier 52, so first amplitude that amplifies oscillator signal 314 becomes littler.And, amplify oscillator signal 316 too for second.
Fig. 3 is illustrated in the conversion amplifying circuit 54 output current by voltage transformation.Solid line among the figure represents that first amplifies the oscillator signal 314 and the second big situation of amplitude of amplifying oscillator signal 316, and the dotted line among the figure represents that first amplifies the oscillator signal 314 and the second little situation of amplitude of amplifying oscillator signal 316.The so-called first little situation of amplitude of amplifying the oscillator signal 314 and the second amplification oscillator signal 316 is for example to imagine the situation of up conversion with equivalent current 328 that do not add in differential amplifier drive current 324.If it is big that the first amplification oscillator signal 314 and second amplifies the amplitude of oscillator signal 316, then because the switch of first switching circuit 62 and second switch circuit 64 becomes at a high speed, can be transformed to the first current oscillation signal 320 and the second current oscillation signal 322 fully, so as a result of, also become big at amplitude by the output current of conversion amplifying circuit 54 conversion.On the other hand, if it is little that the first amplification oscillator signal 314 and second amplifies the amplitude of oscillator signal 316, then because can not be transformed to the first current oscillation signal 320 and the second current oscillation signal 322 fully, so as a result of, diminish at amplitude by the output current of conversion amplifying circuit 54 conversion.
Here, " amplitude of output current " for example according to the peaked of the size of absorption current and source electric current and, the maximum of the size of the maximum of the size of absorption current and source electric current waits and stipulates, but distinguish them ambiguously here.
In the structure of the high-frequency oscillating circuits 100 of present embodiment, the balanced signal that voltage controlled oscillation circuit 50, differential amplifier 52 transmits based on the voltage of differential processing, and this balanced signal finally is transformed to the non-equilibrium signal of electric current in conversion amplifying circuit 54.Between balanced signal according to this configuration, because the deformation component of signal also is cancelled, so the deformation component of signal is reduced, consequently the high fdrequency component of electromagnetic interference (EMI:Electromagnetic Interference) is reduced.Therefore, high-frequency oscillating circuits 100 can be exported the signal that does not comprise unwanted high fdrequency component.
Action according to the high-frequency oscillating circuits 100 of above structure is as described below.If strengthen control voltage 306, then the oscillator drives electric current 308 and the oscillator equivalent current 326 that flow through of voltage-controlled type current source 58 also becomes big.If oscillator drives electric current 308 becomes big, then signal oscillation circuit 60 is exported the first source oscillator signal 310 and the second source oscillator signal 312 of higher frequency of oscillation.And if oscillator equivalent current 326 becomes big, then the differential amplifier drive current 324 that flows out from adder 56 also becomes big.If differential amplifier drive current 324 becomes big, then the first source oscillator signal 310 of the frequency of oscillation that differential amplifier 52 will be higher and the second source oscillator signal 312 are enlarged into the first amplification oscillator signal 314 and the second amplification oscillator signal 316 of enough large amplitudes respectively.
First switching circuit 62 and second switch circuit 64 are transformed to the first current oscillation signal 320 and the second current oscillation signal 322 respectively according to constant current 318 the first amplification oscillator signal 314 and second being amplified oscillator signal 316 from the conversion of constant-current source 70.The value of the first current value conversion amplifying circuit 66 and the second current value conversion amplifying circuit, the 68 difference conversion first current oscillation signals 320 and the second current oscillation signal 322, further the switching by first switching circuit 62 and second switch circuit 64 becomes final output current.And, because it is irrelevant with the size of control voltage 306, conversion from constant-current source 70 is added to differential amplifier drive current 324 and flows to differential amplifier 52 with equivalent current 328, so the amplitude of the first current oscillation signal 320 that is transformed in first switching circuit 62 and second switch circuit 64 and the second current oscillation signal 322 is more near the value of conversion with constant current 318.
According to present embodiment, because make the electric current of the frequency of oscillation of corresponding oscillator signal flow to amplifier, so under the high situation of frequency of oscillation, can make the amplitude of output current become big, and under the low situation of frequency of oscillation, can realize the action of low consumption electric power.In addition, owing to voltage transformation with oscillator signal be that the proportional electric current of electric current that electric current uses has flow to amplifier, so the switching characteristic of amplifier becomes higher, oscillator signal can be amplified to the more voltage of large amplitude, therefore can increase the amplitude of output current.
Execution mode 2
Though execution mode 2 is high-frequency oscillating circuitss identical with execution mode 1, by functional block high-frequency oscillating circuits is described in execution mode 1, and in execution mode 2, the circuit arrangement by FET etc. illustrates high-frequency oscillating circuits.
Fig. 4 represents the high-frequency oscillating circuits 100 of execution mode 2.And in the drawings, to representing with identical label with Fig. 1 identical functions piece and signal.
Variable current source 72 flows through the electric current that changes according to control voltage 306.3 constitute current mirror circuit from transistor Tr 1 to transistor Tr, flow through oscillator equivalent current 326 and oscillator drives electric current 308 respectively from transistor Tr 2 and transistor Tr 3, as previously mentioned, oscillator drives electric current 308, oscillator equivalent current 326 and have proportionate relationship each other from the electric current of variable current source 72.
9 constitute current mirror circuit from transistor Tr 4 to transistor Tr, and 14 also constitute current mirror circuit from transistor Tr 10 to transistor Tr.By these current mirror circuits, the electric current of corresponding oscillator drives electric current 308 flows to ring-like (ring) oscillator of the differential output type that is made of each first inverter 74, second inverter 76, the 3rd inverter 78 and the 4th inverter 80.That is, if oscillator drives electric current 308 becomes big, the electrorheological that then flows to circular type shaker is big, so uprise from the first source oscillator signal 310 of circular type shaker output and the frequency of oscillation of the second source oscillator signal 312.
From transistor Tr 15 to transistor Tr 18, transistor Tr 23 and transistor Tr 24 constitutes differential amplifier 52, the first source oscillator signals 310 and the second source oscillator signal 312 is applied to the gate terminal of transistor Tr 23 and transistor Tr 24 respectively and by differential processing and amplifying.This differential processing and amplifying is identical with execution mode 1, is purpose with the driving force that improves transistor Tr 32 described later and transistor Tr 33.And, from transistor Tr 19 to transistor Tr 22, transistor Tr 25, transistor Tr 26 also constitute differential amplifier 52, so the first source oscillator signal 310 and the second source oscillator signal 312 are amplified by two-stage, be used as first respectively and amplify oscillator signal 314 and second and amplify oscillator signal 316 outputs.In addition, flow to the differential amplifier drive current 324 of each differential amplifier in the back narration.
Transistor Tr 41 and transistor Tr 40 constitutes current mirror circuits, flow through from the conversion of the certain value of variable current source 82 with constant current 318 and with conversion with the conversion of constant current 318 proportional relations with equivalent current 328.
The first amplification oscillator signal 314 that transistor Tr 32 will be applied to gate terminal is transformed to the first current oscillation signal 320.Here, transistor Tr 32 is n channel-styles, so if first value of amplifying oscillator signal 314 becomes big, then the value of the first current oscillation signal 320 also becomes approaching with the value of constant current 318 with conversion.Transistor Tr 33 is carried out the action identical with transistor Tr 32, is transformed to the second current oscillation signal 322.Transistor Tr 34 and transistor Tr 35 constitute current mirror circuit, transform to first output current that has proportionate relationship with the first current oscillation signal 320.And transistor Tr 36 and transistor Tr 37 and transistor Tr 38 and transistor Tr 39 constitute current mirror circuit respectively, are transformed to second output current that has proportionate relationship with the second current oscillation signal 322.Have, first output current and second output current become final output current by the switching of transistor Tr 32 and transistor Tr 33 again.
Transistor Tr 27, transistor Tr 28 and transistor Tr 30 constitute current mirror circuit, flow out the differential amplifier drive current 324 that has proportionate relationship with oscillator equivalent current 326 from transistor Tr 28 and transistor Tr 30.As previously mentioned, if oscillator equivalent current 326 becomes big, it is big that then corresponding with it differential amplifier drive current 324 also becomes.
To add the reasons are as follows of differential amplifier drive current 324 to equivalent current 328 proportional electric currents with conversion.In order to strengthen the amplitude of final output current, need to strengthen conversion constant current 318.But, if voltage is low between the gate-to-source of transistor Tr 32 and transistor Tr 33, then the change action of transistor Tr 32 and transistor Tr 33 is slack-off, so can not transmit the conversion constant current 318 according to the amplitude of the first current oscillation signal 320 and the second current oscillation signal 322 effectively.Thus, flow through the conversion equivalent current 328 that has certain relation with constant current 318 with conversion, the electric current that will flow out from the current mirror circuit that is made of transistor Tr 41, transistor Tr 31, transistor Tr 29 is increased to the differential amplifier drive current 324.
Thus, the differential amplifier drive current 324 that flows to differential amplifier 52 further becomes big, so the operating characteristics of differential amplifier becomes more at a high speed.Therefore, can follow the first source oscillator signal 310 and second change of amplifying oscillator signal 316, it is enough big that first amplitude that amplifies the second source oscillator signal 312 of oscillator signal 314 becomes.Its result, the maximum of voltage becomes big between the gate-to-source of transistor Tr 32 and transistor Tr 33, so the switch motion of transistor Tr 32 and transistor Tr 33 accelerates, transmission efficiently is used to be transformed into the constant current 318 of final output current amplitude.
Fig. 2 represents the output signal as differential amplifier 52, first amplifies the time variation that oscillator signal 314 or second amplifies oscillator signal 316, though Fig. 3 is illustrated in the conversion amplifying circuit 54 output current by voltage transformation, since identical with execution mode 1, so omit its explanation here.
The action of the high-frequency oscillating circuits 100 of above structure is as follows.If strengthen control voltage 306, then the oscillator drives electric current 308 that flows through of the oscillator equivalent current 326 that flows through of the transistor Tr 2 of current mirror circuit and transistor Tr 3 becomes big.If oscillator drives electric current 308 becomes big, then uprise from first inverter 74, second inverter 76, the 3rd inverter 78 and the first source oscillator signal 310 of the 4th inverter 80 outputs and the frequency of oscillation of the second source oscillator signal 312.And big if oscillator equivalent current 326 becomes, then the differential amplifier drive current 324 that flows through of the transistor Tr 28 of current mirror circuit and transistor Tr 30 also becomes big.If differential amplifier drive current 324 becomes big, then in differential amplifier 52, with more first source oscillator signal 310 of high oscillation frequency and the first amplification oscillator signal 314 and second that the second source oscillator signal 312 is amplified to enough large amplitudes respectively amplify oscillator signal 316.
Transistor Tr 32 and transistor Tr 33 based on from the conversion of the transistor Tr 40 of current mirror circuit with constant current 318, amplify oscillator signal 314 and second with first and amplify oscillator signal 316 and be transformed to the first current oscillation signal 320 and the second current oscillation signal 322 respectively.The value of the transistor Tr 35 conversion first current oscillation signal 320 of current mirror circuit, and, the value of the transistor Tr 39 conversion second current oscillation signal 322 of other current mirror circuit.Corresponding transistor Tr 32 of the electric current that is transformed and transistor Tr 33 be switching to final output current.And, irrelevant with the size of control voltage 306, conversion is increased in the differential amplifier drive current 324 by transistor Tr 31 and transistor Tr 29 with equivalent current 328 flows, so voltage also uprises between the gate-to-source of transistor Tr 32 and transistor Tr 33, its result, the amplitude of the first current oscillation signal 320 and the second current oscillation signal 322 is more near the value of conversion with constant current 318.
According to present embodiment, if improve control voltage, then the frequency of oscillation of oscillator signal uprises, the transistor high speed motion of while differential amplifier, thus the amplitude of output current can be strengthened, on the other hand, under the low situation of frequency of oscillation, transistor is moved under low consumption electric power.And, because with being used for voltage transformation with oscillator signal is the transistor that the proportional electric current of electric current that the transistor of electric current uses flows to differential amplifier, so transistor high speed motion of differential amplifier, it is big that amplification signal amplify to become, thus can be more effectively be electric current with the voltage transformation of oscillator signal.
Execution mode 3
Execution mode 3 describes for the device of the high-frequency oscillating circuits of having used execution mode 1 and 2 or the structure of LSI.
The structure of light picker 200 in the application examples of the high-frequency oscillating circuits 100 of Fig. 5 (a) expression execution mode 3.Light picker 200 comprises: high-frequency oscillating circuits 100, semiconductor laser chip 102, monitor with photodiode 104 and be subjected to light usefulness photodiode 108.Light picker 200 carries out reading or writing of signal to the dish of recording medium in information recording/reproducing apparatus such as optical disc apparatus or magneto-optical disc apparatus.
The laser beam of the corresponding electric current that provides from high-frequency oscillating circuits 100 described later is provided for semiconductor laser chip 102.High-frequency oscillating circuits 100 is according to providing electric current with the control signal of representing from the voltage of APC described later (Automatic Power Control) circuit 106 to semiconductor laser chip 102.
The laser beam that optical system 110 will penetrate from semiconductor laser chip 102 as light spot to the dish of not shown recording medium, and, will be from the guides reflected light of the disc light that is subjected to described later with photodiode 108.
Be subjected to light reverberation to be transformed to current signal with photodiode 108.Further this current signal is transformed to voltage signal.Monitor with photodiode 104 and will be transformed to current signal from the part of the laser beam of semiconductor laser chip 102 ejaculations.And the part of said laser beam is meant the laser beam that a side of the optical system 110 that never has semiconductor laser chip 102 penetrates here.
APC circuit 106 is according to monitoring that the current signal with photodiode 104 outputs comes to high-frequency oscillating circuits 100 output control signals, always makes with certain power from semiconductor laser chip 102 outgoing laser beams.That is, carry out the FEEDBACK CONTROL of semiconductor laser chip 102.Here, be equipped with APC circuit 106 because of following reason.Remain to the level of regulation though be necessary voltage signal level with light picker 200 outputs, but because the difference of the power operation individuality of the laser beam of semiconductor laser chip 102 outputs, responsive to the variations in temperature reaction simultaneously, can not make the power of laser beam certain so only semiconductor laser chip 102 is carried out same control, therefore, can not make the output level of voltage signal keep certain.
On the other hand, as enforcement mode 1 and 2 are put down in writing, even high-frequency oscillating circuits 100 in high oscillation frequency, also can strengthen the amplitude of output current, so semiconductor laser chip 102 outgoing laser beam stably.
Fig. 5 (b) is illustrated in the structure of application examples medium frequency translation circuit 202 of the high-frequency oscillating circuits 100 of execution mode 3.Frequency-conversion circuit 202 comprises high-frequency oscillating circuits 100, mlultiplying circuit 122, BPF (Bandpass Filter) 124 and amplifier 126.Frequency-conversion circuit 202 is in communicator, and the signal transformation that should send is the signal that is used to transmit.More particularly, in wireless base station apparatus, baseband signal that will be used to send or frequency translation the intermediate-freuqncy signal frequency translation of this baseband signal be wireless frequency signal.
The signal that signal generating unit 120 should send generates as baseband signal, and this base-band signal frequency is transformed to intermediate frequency.
The voltage of the wireless frequency that uses in corresponding transmission of high-frequency oscillating circuits 100 inputs, the output radio-frequency signals.
Mlultiplying circuit 122 is by the signal of radio-frequency signals frequency translation intermediate frequency.And BPF124 reduces the influence of the high frequency waves that take place by frequency translation.
Amplifier 126 sends in wireless transmission path for the output signal with BPF124, and it is amplified to the electric power of regulation.
Here, as enforcement mode 1 and 2 records, even high-frequency oscillating circuits 100 also can be exported the electric current of big numerical value in high oscillation frequency, so semiconductor laser chip 102 can stably be exported radio-frequency signals.
Fig. 5 (c) is illustrated in the structure of PLL204 in the application examples of high-frequency oscillating circuits 100 of execution mode 3.PLL204 comprises high-frequency oscillating circuits 100, phase comparator 150, ring-like filter 152 and frequency divider 154.
Phase comparator 150 is relatively from the reference clock signal of outside input with from the phase place and the frequency of the reference clock signal of frequency divider 154 inputs, output and the proportional direct current signal of its difference.Ring-like filter 152 is removed the high fdrequency component of the signal of input, output control voltage.The clock signal of the frequency of the control voltage of the corresponding input of high-frequency oscillating circuits 100 outputs.Here, export the clock signal of the N frequency doubly of frequency with reference clock signal.The clock signal of output is divided down to 1/N in frequency divider 154, be imported into phase comparator 150 as the reference clock signal.
According to present embodiment,, and can realize that in low frequency of oscillation the high-frequency oscillating circuits of the action of low consumption electric power is applied among various devices and the LSI even can also can strengthen the amplitude of output current with in high oscillation frequency.
And, the corresponding relation of the structure of illustration the present invention and execution mode.The variable current source 72 of " differential-type oscillator signal generative circuit " and voltage-controlled type current source 58 and transistor Tr 1, transistor Tr 3 and the signal oscillation circuit 60 of current mirror circuit are corresponding." differential amplifier " is corresponding with differential amplifier 52." conversion amplifying circuit " is corresponding with conversion amplifying circuit 54." the interdependent type of frequency is adjusted circuit " is corresponding with transistor Tr 27, transistor Tr 28 and the transistor Tr 30 of the current mirror circuit of transistor Tr 1, transistor Tr 2 and the adder 56 of the current mirror circuit of voltage-controlled type current source 58." differential-type circular type shaker " is corresponding with first inverter 74, second inverter 76, the 3rd inverter 78 and the 4th inverter 80 of signal oscillation circuit 60.Two current mirror circuits of " drive circuit " and signal oscillation circuit 60 14 corresponding from transistor Tr 4 to transistor Tr.
And the variable current source 72 of " differential-type oscillator signal generative circuit " and voltage-controlled type current source 58 and transistor Tr 1, transistor Tr 3 and the signal oscillation circuit 60 of current mirror circuit are corresponding." differential amplifier " is corresponding with differential amplifier 52." conversion amplifying circuit " is corresponding with conversion amplifying circuit 54." initialization circuit " is corresponding with constant-current source 70.It is corresponding with transistor Tr 41, transistor Tr 31 and the transistor Tr 29 of the current mirror circuit of constant-current source 70 and adder 56 " to export interdependent type adjustment circuit ".
More than based on execution mode the present invention has been described.It is illustration that those skilled in the art should understand this execution mode, and the combination by these each structural elements and variety of processes can have various variation, and the variation of Xing Chenging is also in scope of the present invention like this.
In execution mode 2, constitute differential amplifier 52 by two differential amplifiers.But be not limited to this, for example constitute also passable by a differential amplifier and three differential amplifiers.According to this variation, can change first and amplify the amplitude that oscillator signal 314 and second amplifies oscillator signal 316.That is, the corresponding differential amplifier that amplifies the quantity of oscillator signal 314 and the second amplification oscillator signal, 316 desired values from first of differential amplifier 52 outputs can be set also.
Although the mode by embodiment has been described the present invention, should be appreciated that those skilled in the art under the situation that does not exceed claim of the present invention institute restricted portion, can further carry out various changes and substitute.
Claims (5)
1, a kind of oscillating circuit is characterized in that comprising:
Differential-type oscillator signal generative circuit can be set the frequency of oscillation of oscillator signal, and the described oscillator signal of having set frequency of oscillation is exported as differential wave;
Differential amplifier, differential amplification is as the oscillator signal of described differential wave output;
The conversion amplifying circuit is electric current and amplifies the voltage transformation of the oscillator signal of described differential amplification;
The interdependent type of frequency is adjusted circuit, according to the setting content of described differential-type oscillator signal generative circuit, adjusts the operating characteristics of described differential amplifier.
2, oscillating circuit as claimed in claim 1 is characterized in that:
In described differential-type oscillator signal generative circuit, when having set the frequency of oscillation of described oscillator signal than the highland, the interdependent type of described frequency is adjusted the responsiveness that circuit improves described differential amplifier.
3, oscillating circuit as claimed in claim 1 is characterized in that:
Described differential-type oscillator signal generative circuit comprises:
The circular type shaker of differential-type;
Drive circuit to the circular type shaker of described differential-type, flows through the drive current according to described setting content,
The interdependent type of described frequency is adjusted circuit and is made the electric current that flows through corresponding described drive current in the described differential amplifier, makes described differential amplifier action.
4, a kind of oscillating circuit is characterized in that, comprising:
Differential-type oscillator signal generative circuit is exported the oscillator signal of regulation as differential wave;
Differential amplifier, differential amplification is as the oscillator signal of described differential wave output;
The conversion amplifying circuit is electric current and amplifies the voltage transformation of the oscillator signal of described differential amplification;
Initialization circuit is set the conversion characteristics of described conversion amplifying circuit;
Export interdependent type and adjust circuit, adjust the operating characteristics of described differential amplifier according to the setting content of described initialization circuit.
5, oscillating circuit as claimed in claim 4 is characterized in that:
In described initialization circuit, when setting the voltage transformation be used for described oscillator signal significantly and be the electric current of electric current, the interdependent type of described output is adjusted the responsiveness that circuit improves described differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410059349 CN1710804A (en) | 2004-06-18 | 2004-06-18 | Oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410059349 CN1710804A (en) | 2004-06-18 | 2004-06-18 | Oscillator |
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| Publication Number | Publication Date |
|---|---|
| CN1710804A true CN1710804A (en) | 2005-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410059349 Pending CN1710804A (en) | 2004-06-18 | 2004-06-18 | Oscillator |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266502B (en) * | 2008-04-08 | 2010-04-14 | 中国计量学院 | Random resonance control method based on double resonance |
| CN103516323A (en) * | 2012-06-28 | 2014-01-15 | 盛群半导体股份有限公司 | On-chip oscillation device |
-
2004
- 2004-06-18 CN CN 200410059349 patent/CN1710804A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101266502B (en) * | 2008-04-08 | 2010-04-14 | 中国计量学院 | Random resonance control method based on double resonance |
| CN103516323A (en) * | 2012-06-28 | 2014-01-15 | 盛群半导体股份有限公司 | On-chip oscillation device |
| CN103516323B (en) * | 2012-06-28 | 2016-03-16 | 盛群半导体股份有限公司 | On-chip oscillation device |
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Open date: 20051221 |