CN101442310A - Voltage control oscillating circuit - Google Patents
Voltage control oscillating circuit Download PDFInfo
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- CN101442310A CN101442310A CNA2007101936343A CN200710193634A CN101442310A CN 101442310 A CN101442310 A CN 101442310A CN A2007101936343 A CNA2007101936343 A CN A2007101936343A CN 200710193634 A CN200710193634 A CN 200710193634A CN 101442310 A CN101442310 A CN 101442310A
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Abstract
The invention provides a voltage control oscillating circuit, which comprises an amplifying circuit provided with a first node, an amplifying circuit end current source, of which one end is connected with the first node and the other end is connected with grounding voltage(VGN), a latch circuit provided with a second node, a latch circuit end current source, of which one end is connected with the second node and the other end is connected with the grounding voltage, a load resistance, of which one end is electrically connected with the amplifying circuit and the latch circuit and the other end is electrically connected with power supply voltage(Vdd) and a current modulation circuit comprising a first PMOS switch, a second PMOS switch and a modulation circuit end current source, wherein the first PMOS switch is connected with the first node, the second PMOS switch is connected with the second node, one end of the modulation circuit end current source is connected with the first PMOS switch and the second PMOS switch, and the other end of the modulation circuit end current source is connected with the power supply voltage.
Description
Technical field
The present invention relates to a kind of voltage-controlled oscillator, particularly a kind of voltage-controlled oscillator that is applied to the current-mode latch-type.
Background technology
General traditional current-mode (current mode logic, CML) latch voltage-controlled oscillator (the voltage controlled oscillator of (latch) type, VCO), its output frequency curve can be kept the characteristic of single order (first-order) in certain modulation range.Therefore, have the high advantage of the linearity, and if be applied to the phase-locked loop (phase locked loop, PLL) in, (phase noise) is also quite little for the phase noise of oscillator.
The voltage-controlled oscillator of traditional current-mode latch-type (CML-latch type VCO), implementation method is shown in " Figure 1A ".Voltage-controlled oscillator A1 comprises: amplifying circuit A10, cross-coupled latch cicuit (cross-coupled latch) A20, load resistance A30, and current-modulation circuit A40.And the voltage output place (V of voltage-controlled oscillator A1
Out) connection load capacitance (C
Load).Therefore, the equivalent electric circuit of above-mentioned voltage-controlled oscillator A1 (VCO cell) can be regarded load resistance A30 and the formed resistance of cross-coupled latch cicuit A20 (1/gm) parallel connection, a RC loop that forms with the load capacitance of output again as.Wherein, amplifying circuit A10 gives the RC loop as Voltage-controlled Current Source so that electric current to be provided, in order to keep the oscillation energy of voltage-controlled oscillator.And by the first control voltage V that adjusts among the current-modulation circuit A40
C1With the second control voltage V
C2, can control flows cross the current ratio of amplifying circuit A10 and cross-coupled latch cicuit A20.
The voltage-controlled oscillator of current-mode latch-type, its operating voltage and bias point (biasing point) must guarantee that all MOS transistor all operate in saturation region (saturation region).Explain with " Figure 1A ", in supply voltage (V
Dd) to earthed voltage (V
GN) between a wherein a certain loop be example, be total to a MOS transistor among series load resistance A30, the amplifying circuit A10, a MOS transistor among the current-modulation circuit A40, and the current source among the current-modulation circuit A40 (electric current comes from the electric current that is generally MOS current mirror institute mirror image in the realization, so current source also to can be used as be MOS transistor).3 MOS transistor of connecting so, altogether and a load resistance A30.Therefore, generally, in order to make that voltage-controlled oscillator can proper operation, required operating voltage is at least V
t+ 3*V
Dsat+ V
SwingWherein, V
tBe the threshold voltage (threshold voltage) of MOS transistor, V
DsatBe the saturation voltage of MOS transistor, and V
SwingDrifting voltage for load resistance A30 two ends.See it from the angle of signal processing, V
SwingOutput amplitude can wish to get bigger usually so that circuit has the preferable antinoise and the ability of anti-jitter, but in fact also can maintain saturation region, then V for the MOS transistor of the input amplifier of guaranteeing the next stage circuit
SwingValue be V to the maximum
tSo, the required operating voltage of whole voltage-controlled oscillator is at least 2*V
t+ 3*V
DsatThis trend that supply voltage is day by day dwindled is very harsh restriction, particularly in advanced process, the threshold voltage of MOS transistor improves compared to the ratio of supply voltage, so cause voltage remaining (voltageheadroom) deficiency of supply voltage, will make that the application of voltage-controlled oscillator of traditional current-mode latch-type is limited to.
Please refer to " Figure 1B ", this figure is depicted as second example of the voltage-controlled oscillator of current known pattern latch-type.In order to solve the problem of above-mentioned voltage remaining, adopt mode as " Figure 1B ".Utilize the electric current folding past power end of current mirror (current mirror) A50, use PMOS transistor A60 instead and control the voltage modulated amount the desire modulation.Adopt this way the operating voltage of voltage-controlled oscillator in script first example can be limited by original 2*V
t+ 3*V
DsatBe reduced to 2*V
t+ 2*V
DsatReduced the pressure drop that series connection caused (i.e. V of a MOS transistor
Dsat).
Yet, adopt the mode of above-mentioned second example will produce new problem.Because not matching between current mirror A50 can cause adding up of error, and then make noise increase.Therefore, the matching degree of current mirror A50 (matching) needs to reach, the just unlikely amount that allows error serious offense desire modulate.Because the relation of process conditions is difficult for producing the transistor of coupling fully, and forms the current mirror of coupling fully.So the mode that second example is adopted no doubt reduces the restriction of operating voltage, and has increased the voltage remaining, but simultaneously also because of the unmatched relation of current mirror, and increased noise.
Summary of the invention
In view of this, invention proposes a kind of voltage-controlled oscillator, and the current-mode that can be applicable to low voltage operating latchs in the loop.The voltage-controlled oscillator that the present invention proposes not only has all advantages of the voltage-controlled oscillator of conventional current pattern latch-type, and only needs lower supply voltage, increases voltage remaining (voltage headroom).Do not add and need use current mirror, therefore the shortcoming that can avoid current mirror not match and produced.
The present invention proposes a kind of voltage-controlled oscillator and comprises: amplifying circuit, amplifying circuit end current source, latch cicuit, latch cicuit end current source, load resistance and current-modulation circuit.Amplifying circuit has first node, and amplifying circuit end current source one end connects first node, and the other end connects earthed voltage (V
GN).Latch cicuit has Section Point, and latch cicuit end current source one end connects Section Point, and the other end connects earthed voltage.Load resistance one end electrically connects amplifying circuit and latch cicuit, and the other end electrically connects supply voltage (V
Dd).The current-modulation circuit comprises a PMOS switch, the 2nd PMOS switch and modulation electric terminal current source, wherein a PMOS switch connects first node, the 2nd PMOS switch connects Section Point, and modulation electric terminal current source one end connects a PMOS switch and the 2nd PMOS switch, and the other end connects supply voltage.
The present invention also proposes a kind of voltage-controlled oscillator and comprises: amplifying circuit, amplifying circuit end current source, latch cicuit, latch cicuit end current source, load resistance and current-modulation circuit.Amplifying circuit has first node, and amplifying circuit end current source one end connects first node, and the other end connects supply voltage.Latch cicuit has Section Point, and latch cicuit end current source one end connects Section Point, and the other end connects supply voltage.Load resistance one end electrically connects amplifying circuit and latch cicuit, and the other end electrically connects earthed voltage.The current-modulation circuit comprises first nmos switch, second nmos switch and modulation electric terminal current source, wherein first nmos switch connects first node, second nmos switch connects Section Point, and modulation electric terminal current source one end connects first nmos switch and second nmos switch, and the other end connects earthed voltage.
The present invention also proposes a kind of voltage-controlled oscillator and comprises: amplifying circuit, latch cicuit, amplifying circuit end current source, latch cicuit end current source and current-modulation circuit.Amplifying circuit one end is coupled to output port, and its other end has first node.Latch cicuit one end is coupled to output port, and its other end has Section Point.Amplifying circuit end current source is coupled to first node, is used to provide first magnitude of current of the first node of flowing through.Latch cicuit end current source is coupled to Section Point, is used to provide second magnitude of current of the Section Point of flowing through.The current-modulation circuit is coupled to first node and Section Point, be used for according at least one control voltage, the magnitude of current of shunting at least a portion in first magnitude of current, with the flow through magnitude of current of amplifying circuit of decision, and in second magnitude of current magnitude of current of shunting at least a portion, with the flow through magnitude of current of latch cicuit of decision.Wherein, the frequency of oscillation of voltage control oscillating circuit is corresponding to the magnitude of current of the amplifying circuit of flowing through and the magnitude of current of the latch cicuit of flowing through.
Relevant preferred embodiment of the present invention and effect thereof, cooperate now graphic explanation as after.
Description of drawings
Figure 1A: first example of the voltage-controlled oscillator of current known pattern latch-type.
Figure 1B: second example of the voltage-controlled oscillator of current known pattern latch-type.
Fig. 2: first embodiment of voltage-controlled oscillator of the present invention.
Fig. 3: second embodiment of voltage-controlled oscillator of the present invention.
Fig. 4: the 3rd embodiment of voltage-controlled oscillator of the present invention.
Fig. 5: the 4th embodiment of voltage-controlled oscillator of the present invention.
Fig. 6: the 5th embodiment of voltage-controlled oscillator of the present invention.
Fig. 7: the 6th embodiment of voltage-controlled oscillator of the present invention.
The main element symbol description
A1: voltage-controlled oscillator
A10: amplifying circuit
A20: cross-coupled latch cicuit
A30: load resistance
A40: current-modulation circuit
A50: current mirror
The A60:PMOS transistor
10: amplifying circuit
12: first node
20: latch cicuit
22: Section Point
30: load resistance
40: the current-modulation circuit
41: the one PMOS switches
42: the two PMOS switches
43: modulation electric terminal current source
Shunting in 431: the first
Shunting in 432: the second
44: shunt resistance
45: the first nmos switches
46: the second nmos switches
50: amplifying circuit end current source
60: latch cicuit end current source
Embodiment
Please refer to " Fig. 2 ", this figure is depicted as first embodiment of voltage-controlled oscillator of the present invention.The voltage-controlled oscillator of present embodiment mainly comprises: amplifying circuit 10, latch cicuit 20, load resistance 30, current-modulation circuit 40, amplifying circuit end current source 50, and latch cicuit end current source 60.Wherein amplifying circuit 10, latch cicuit 20, load resistance 30 interconnect with differential form (differential configuration).
Amplifying circuit 10 comprises first node 12, and latch cicuit 20 comprises Section Point 22.In present embodiment, amplifying circuit 10 is a differential amplifier of being made up of bi-NMOS transistor, and 20 of latch cicuits are that a cross-couplings of being made up of bi-NMOS transistor is to (cross coupled pair).Load resistance 30 is made up of a pair of resistor, and the one end electrically connects amplifying circuit 10 and latch cicuit 20, and the other end electrically connects supply voltage (V
Dd).Current-modulation circuit 40 comprise a PMOS switch 41, the 2nd PMOS switch 42, with modulation electric terminal current source 43.Wherein, the first node 12 that a PMOS switch 41 connects in the amplifying circuit 10, and the Section Point 22 that the 2nd PMOS switch 42 connects in the latch cicuit 20.And modulation electric terminal current source 43 1 ends connect a PMOS switch 41 and the 2nd PMOS switch 42, and the other end connects supply voltage (V
Dd).One end of amplifying circuit end current source 50 connects the first node 12 in the amplifying circuit 10, and the other end then is connected in earth terminal (V
GN).One end of latch cicuit end current source 60 connects the Section Point 22 in the latch cicuit 20, and the other end then is connected in earth terminal (V
GN).
In present embodiment, the magnitude of current I of modulation electric terminal current source 43
3Be a fixed value, the magnitude of current I that it is a part of
1Flow to first node 12 via a PMOS switch 41, the magnitude of current I of its remainder
2Then flow to Section Point 22 via the 2nd PMOS switch 42; That is, I
3=I
1+ I
2As shown in FIG., the first control voltage V
C1The grid that connects a PMOS switch 41 is by adjusting the first control voltage V
C1Size, i.e. its magnitude of current that is circulated of may command, even it is opened circuit.Same, the second control voltage V
C2The grid that connects the 2nd PMOS switch 42 is by adjusting the second control voltage V
C2Size, i.e. its magnitude of current that is circulated of may command, even it is opened circuit.
With " Fig. 2 " is example, if with the first control voltage V
C1Turn down, modulation electric terminal current source 43 flows to the magnitude of current I of first node 12
1Will become big, the magnitude of current I of the amplifying circuit 10 of then flowing through
6Will diminish jointly; Relatively, if this moment is with the second control voltage V
C2Transfer greatly accordingly, modulation electric terminal current source 43 flows to the magnitude of current I of Section Point 22
2Will diminish the magnitude of current I of the latch cicuit 20 of then flowing through
7Will become big jointly.Otherwise, if with the first control voltage V
C1Transfer greatly, and with the second control voltage V
C2Turn the magnitude of current I of the amplifying circuit 10 of then flowing through down
6Will become big, and the magnitude of current I of the latch cicuit 20 of flowing through
7Then can diminish.So, can be by adjusting the first control voltage V
C1With the second control voltage V
C2, come the magnitude of current I of control flows through amplifying circuit 10
6Magnitude of current I with the latch cicuit 20 of flowing through
7Ratio, and the different magnitude of current, promptly corresponding to different bias point, the frequency of oscillation of voltage-controlled oscillator also can change thereupon with, reach the effect of voltage-controlled oscillating frequency.
It is noted that at this, for the amplitude of output signal in the process that make to adjust frequency of oscillation maintains within certain mobility scale the first control voltage V as far as possible
C1With the second control voltage V
C2Usually can control with the form of differential wave, that is the first control voltage V
C1With the second control voltage V
C2With a specific common mode (common mode) voltage level is the center, symmetrically change.Yet those skilled in the art should understand, and the present invention is not as limit.
As mentioned above, the voltage control oscillating circuit that is proposed in the present embodiment, be in based on the circuit that nmos pass transistor was constituted, (to comprise amplifying circuit 10, latch cicuit 20, amplifying circuit end current source 50, latch cicuit end current source 60 etc.), utilize one to be the current-modulation circuit 40 of main institute structure with the PMOS transistor, current-modulation mechanism is upwards rolled over toward (fold) power end, that is be connected in supply voltage (V
Dd).Under such configuration, current-modulation circuit 40 can be according to the first control voltage V
C1With the second control voltage V
C2Modulation size, to change, change the magnitude of current of flow through amplifying circuit 10 and latch cicuit 20, to adjust frequency of oscillation from the mode of first node 12 with the magnitude of current size of Section Point 22 shuntings (branching); That is, to deduct part magnitude of current I from amplifying circuit end current source 50
1, and deduct part magnitude of current I from latching circuit end current source 60
2Mode, decide frequency of oscillation.So then make current-modulation circuit 40 not need as prior art, need through extra current mirror upset.Therefore, got rid of the current mirror shortcoming that (mismatch) produced that do not match.
Moreover the voltage control oscillating circuit that present embodiment proposed is with supply voltage (V
Dd) to earthed voltage (V
GN) between a wherein a certain loop be example, a MOS transistor in series load resistance 30, the amplifying circuit 10 altogether, and the current source that an end is connected in the amplifying circuit 10 (electric current comes from the electric current that is generally MOS current mirror institute mirror image in the realization, so current source also to can be used as be MOS transistor).2 MOS transistor of connecting so, altogether and a load resistance 30.Therefore, the voltage that need consume on the whole is V
t+ 2*V
Dsat+ V
SwingWherein, V
SwingBe value V as previously mentioned to the maximum
tSo, the whole voltage-controlled oscillator voltage that need consume is 2*V
t+ 2*V
DsatThan the voltage 2*V that traditional prior art consumed
t+ 3*V
Dsat, save a V
DsatValue.Therefore, voltage control oscillating circuit proposed by the invention does not match the shortcoming that is produced except getting rid of current mirror, more reduces the too high shortcoming of attrition voltage traditionally, and then improves the voltage remaining of integrated circuit.
Please refer to " Fig. 3 " and be second embodiment of voltage-controlled oscillator of the present invention.The difference of " Fig. 3 " and " Fig. 2 " be in: modulation electric terminal current source 43 comprises first shunting 431 and second and shunts 432 " Fig. 3 " in.Wherein, first shunting 431 connects a PMOS switch 41, and second shunting connects the 2nd PMOS switch 42.And half of current value that 432 current value is a modulation electric terminal current source 43 shunted in first shunting 431 and second.Just,, be divided into two electric current shuntings, so the total current value is middle consistent with " Fig. 2 ", can't consume extra electric current more with single modulation electric terminal current source 43 originally.
Also comprise a shunt resistance 44 in " Fig. 3 ", and shunt resistance 44 1 ends are connected in the junction of first shunting the 431 and the one PMOS switch 41, the other end is connected in second junction of shunting the 432 and the 2nd PMOS42 switch.In this embodiment, between first shunting, 431 and second shunting 432, a multi-link shunt resistance 44, it can reach the effect of source class degeneration (source degeneration), make that the range of linearity of control voltage of current-modulation circuit 40 is wider, and increase the linearity (linearity) of current-modulation circuit 40.
Please refer to " Fig. 4 " and be the 3rd embodiment of voltage-controlled oscillator of the present invention." Fig. 4 " based on the circuit framework of " Fig. 3 ", and its circuit framework of deriving can overlap equally and is used for " Fig. 2 ".In the 3rd embodiment of " Fig. 4 ", the amplifying circuit end current source 50 that is connected in the first node 12 of amplifying circuit 10 is realized with two groups of current mirrors of mutual serial connection (cascade).Similarly, the latch cicuit end current source 60 that is connected in the Section Point 22 of latch cicuit 20 is also realized with two groups of current mirrors of mutual serial connection.This kind be with current mirror serial connection (cascade) current source that configuration was constituted, and can reduce the interference that noise that voltage control oscillating circuit produces is caused to other parts of circuit by current mirror coupled.On the other hand, also can increase the output impedance of current mirror, reduce the influence of passage length modulation (channel lengthmodulation).In the middle of two groups of current mirrors of above-mentioned serial connection; the component size that is positioned at below person (promptly apart from the nearer person of earth terminal) can be designed to be positioned at top person usually and be big (for example: the ratio of both sizes is 10:1); so the minimizing effects of jamming that is reached can be better, but the present invention is not as limit.Again, the current mirror number of serial connection does not also exceed with two.
Above-mentioned " Fig. 2 ", " Fig. 3 " reach " Fig. 4 " three embodiment, can with amplifying circuit 10, latch cicuit 20, current-modulation circuit 40, amplifying circuit end current source 50, and latch cicuit end current source 60 in MOS transistor, replace with NMOS by PMOS, and NMOS replaces with PMOS.Again with supply voltage (V
Dd) and earthed voltage (V
GN) the position exchange.So, can become the voltage control oscillating circuit of another kind of complementary type.Embodiment reaches shown in " Fig. 7 " as " Fig. 5 ", " Fig. 6 ", is respectively fourth, fifth, six embodiment of voltage-controlled oscillator of the present invention.Under be that example explains with " Fig. 5 ", and " Fig. 6 " reach " Fig. 7 " as described above for " Fig. 3 " reached " Fig. 4 " middle PMOS, nmos pass transistor exchange, and supply voltage, earthed voltage exchange, can reach.
Please refer to " Fig. 5 " and be fourth embodiment of the invention, this embodiment is similar with the circuit framework of " Fig. 2 ", and difference is to replace with NMOS by PMOS, and NMOS replaces with PMOS, and supply voltage (V
Dd) and earthed voltage (V
GN) the position exchange.So load resistance 30 other ends change into and electrically connect earthed voltage (V
GN).Two switches that current-modulation circuit 40 is comprised change first nmos switch 45 and second nmos switch 46 into.And modulation electric terminal current source 43 1 ends connect first nmos switch 45 and second nmos switch 46, and the other end then connects earthed voltage (V
GN).
First nmos switch 45 in the current-modulation circuit 40 is connected to the first control voltage V
C1, and by adjusting the first control voltage V
C1May command amplifying circuit end current source 50 flows to the magnitude of current I of first node 12 to modulation electric terminal current source 43
1In the present embodiment, amplifying circuit end current source 50 provides a fixing magnitude of current I from first node 12
4, the magnitude of current I of the amplifying circuit 10 of then flowing through
6=I
4-I
1, can be by adjusting the first control voltage V
C1Control indirectly.Similarly, second nmos switch 46 in the current-modulation circuit 40 is connected to the second control voltage V
C2, and by adjusting the second control voltage V
C2May command latch cicuit end current source 60 flows to the magnitude of current I of Section Point 22 to modulation electric terminal current source 43
2In the present embodiment, latch cicuit end current source 60 provides a fixing magnitude of current I from Section Point 22
5, the magnitude of current I of the latch cicuit 20 of then flowing through
7=I
5-I
2, can be by adjusting the second control voltage V
C2Control indirectly.
In present embodiment, the magnitude of current I of modulation electric terminal current source 43
3Be a fixed value, the magnitude of current I that it is a part of
1Flow into the magnitude of current I of its remainder via first nmos switch 45
2Then flow into via second nmos switch 46; Also promptly, I
3=I
1+ I
2As shown in FIG., the first control voltage V
C1The grid that connects first nmos switch 45 is by adjusting the first control voltage V
C1Size, i.e. its magnitude of current that is circulated of may command, even it is opened circuit.Same, the second control voltage V
C2The grid that connects second nmos switch 46 is by adjusting the second control voltage V
C2Size, i.e. its magnitude of current that is circulated of may command, even it is opened circuit.
With " Fig. 5 " is example, if with the first control voltage V
C1Turn down, amplifying circuit end current source 50 flows to the magnitude of current I of first node 12
1Will diminish the magnitude of current I of the amplifying circuit 10 of then flowing through
6Will become big jointly; Relatively, if this moment is with the second control voltage V
C2Transfer greatly accordingly, latch cicuit end current source 60 flows to the magnitude of current I of Section Point 22
2Will become big, the magnitude of current I of the latch cicuit 20 of then flowing through
7Will diminish jointly.Otherwise, if with the first control voltage V
C1Transfer greatly, and with the second control voltage V
C2Turn the magnitude of current I of the amplifying circuit 10 of then flowing through down
6Will diminish, and the magnitude of current I of the latch cicuit 20 of flowing through
7Then can become big.So, can be by adjusting the first control voltage V
C1With the second control voltage V
C2, come the magnitude of current I of control flows through amplifying circuit 10
6Magnitude of current I with the latch cicuit 20 of flowing through
7Ratio, and the different magnitude of current, promptly corresponding to different bias point, the frequency of oscillation of voltage-controlled oscillator also can change thereupon with, reach the effect of voltage-controlled oscillating frequency.
Though technology contents of the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; those skilled in the art; do not breaking away from spirit of the present invention a little change and the retouching done; all should be covered by in the category of the present invention, so protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (17)
1. voltage control oscillating circuit comprises:
One amplifying circuit comprises a first node;
One amplifying circuit end current source, an end connects this first node, and the other end connects an earthed voltage VGN;
One latch cicuit comprises a Section Point;
One latch cicuit end current source, an end connects this Section Point, and the other end connects this earthed voltage;
One load resistance, an end electrically connect this amplifying circuit and this latch cicuit, and the other end electrically connects a supply voltage Vdd; And
One current-modulation circuit, comprise one the one PMOS switch, one the 2nd PMOS switch and a modulation electric terminal current source, wherein a PMOS switch connects this first node, the 2nd PMOS switch connects this Section Point, and this modulation electric terminal current source one end connects a PMOS switch and the 2nd PMOS switch, and the other end connects this supply voltage.
2. voltage control oscillating circuit as claimed in claim 1, wherein this amplifying circuit, this latch cicuit and this load resistance connect with differential form.
3. voltage control oscillating circuit as claimed in claim 1, wherein a PMOS switch connects one first control voltage in this current-modulation circuit, by adjusting the magnitude of current that this this modulation electric terminal current source of first control voltage control flows to this amplifying circuit.
4. voltage control oscillating circuit as claimed in claim 1, wherein the 2nd PMOS switch connects one second control voltage in this current-modulation circuit, by adjusting the magnitude of current that this this modulation electric terminal current source of second control voltage control flows to this latch cicuit.
5. voltage control oscillating circuit as claimed in claim 1, wherein this modulation electric terminal current source comprises one first shunting and one second shunting, and wherein this first shunting connects a PMOS switch, and this second shunting connects the 2nd PMOS switch.
6. voltage control oscillating circuit as claimed in claim 5 also comprises a shunt resistance, and an end is connected in the junction of this first shunting and a PMOS switch, and the other end is connected in the junction of this second shunting and the 2nd PMOS switch.
7. voltage control oscillating circuit comprises:
One amplifying circuit comprises a first node;
One amplifying circuit end current source, an end connects this first node, and the other end connects a supply voltage Vdd;
One latch cicuit comprises a Section Point;
One latch cicuit end current source, an end connects this Section Point, and the other end connects this supply voltage;
One load resistance, an end electrically connect this amplifying circuit and this latch cicuit, and the other end electrically connects an earthed voltage VGN; And
One current-modulation circuit, comprise one first nmos switch, one second nmos switch and a modulation electric terminal current source, wherein this first nmos switch connects this first node, this second nmos switch connects this Section Point, and this modulation electric terminal current source one end connects this first nmos switch and this second nmos switch, and the other end connects this earthed voltage.
8. voltage control oscillating circuit as claimed in claim 7, wherein this amplifying circuit, this latch cicuit and this load resistance connect with differential form.
9. voltage control oscillating circuit as claimed in claim 7, wherein this first nmos switch connects one first control voltage in this current-modulation circuit, by adjusting the magnitude of current that this this amplifying circuit end current source of first control voltage control flows to this amplifying circuit.
10. voltage control oscillating circuit as claimed in claim 7, wherein this second nmos switch connects one second control voltage in this current-modulation circuit, by adjusting the magnitude of current that this this latch cicuit end current source of second control voltage control flows to this latch cicuit.
11. voltage control oscillating circuit as claimed in claim 7, wherein this modulation electric terminal current source comprises one first shunting and one second shunting, and wherein this first shunting connects this first nmos switch, and this second shunting connects this second nmos switch.
12. voltage control oscillating circuit as claimed in claim 11, wherein this first shunting is half of current value of this modulation electric terminal current source with current value of this second shunting.
13. a voltage control oscillating circuit comprises:
One amplifying circuit, the one end is coupled to an output port, and its other end has a first node;
One latch cicuit, the one end is coupled to this output port, and its other end has a Section Point;
One amplifying circuit end current source is coupled to this first node, is used to provide first magnitude of current of flowing through this first node;
One latch cicuit end current source is coupled to this Section Point, is used to provide second magnitude of current of flowing through this Section Point; And
One current-modulation circuit, be coupled to this first node and this Section Point, be used for according at least one control voltage, the magnitude of current of shunting at least a portion in this first magnitude of current, with the flow through magnitude of current of this amplifying circuit of decision, and the magnitude of current of shunting at least a portion in this second magnitude of current certainly, with the flow through magnitude of current of this latch cicuit of decision;
The frequency of oscillation of this voltage control oscillating circuit wherein is corresponding to the magnitude of current of this amplifying circuit of flowing through and the magnitude of current of this latch cicuit of flowing through.
14. voltage control oscillating circuit as claimed in claim 13, wherein the current-modulation circuit comprises:
One the one MOS switch couples this first node, according to the flow through magnitude of current of this amplifying circuit of this control voltage decision; And
One the 2nd MOS switch couples this Section Point, according to the flow through magnitude of current of this latch cicuit of this control voltage decision.
15. voltage control oscillating circuit as claimed in claim 13, wherein amplifying circuit, this latch cicuit and this load resistance connect with differential form.
16. voltage control oscillating circuit as claimed in claim 13, wherein this amplifying circuit end current source forms with at least one current mirror serial connection.
17. voltage control oscillating circuit as claimed in claim 13, wherein this wherein this latch cicuit end current source form with at least one current mirror serial connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101936343A CN101442310A (en) | 2007-11-23 | 2007-11-23 | Voltage control oscillating circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101936343A CN101442310A (en) | 2007-11-23 | 2007-11-23 | Voltage control oscillating circuit |
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| CN101442310A true CN101442310A (en) | 2009-05-27 |
Family
ID=40726595
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| CNA2007101936343A Pending CN101442310A (en) | 2007-11-23 | 2007-11-23 | Voltage control oscillating circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036556A (en) * | 2011-07-08 | 2013-04-10 | 英飞凌科技股份有限公司 | Oscillator circuit |
| CN104883168A (en) * | 2014-02-27 | 2015-09-02 | 晨星半导体股份有限公司 | Integrated circuit capable of preventing current from flowing backwards to power line |
| CN108886413A (en) * | 2016-02-09 | 2018-11-23 | 认知系统公司 | Transformation is carried out to the voltage in voltage-controlled oscillator used in wireless sensor device |
-
2007
- 2007-11-23 CN CNA2007101936343A patent/CN101442310A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036556A (en) * | 2011-07-08 | 2013-04-10 | 英飞凌科技股份有限公司 | Oscillator circuit |
| US9083362B2 (en) | 2011-07-08 | 2015-07-14 | Infineon Technologies Ag | Oscillator circuit |
| CN104883168A (en) * | 2014-02-27 | 2015-09-02 | 晨星半导体股份有限公司 | Integrated circuit capable of preventing current from flowing backwards to power line |
| CN104883168B (en) * | 2014-02-27 | 2017-12-15 | 晨星半导体股份有限公司 | It can prevent electric current from pouring in down a chimney to the integrated circuit of power line |
| CN108886413A (en) * | 2016-02-09 | 2018-11-23 | 认知系统公司 | Transformation is carried out to the voltage in voltage-controlled oscillator used in wireless sensor device |
| CN108886413B (en) * | 2016-02-09 | 2021-03-05 | 认知系统公司 | Voltage transformation device, circuit and method of voltage control oscillator for wireless sensor |
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