CN104253594B - The operating method of charging module, drive circuit and drive circuit - Google Patents
The operating method of charging module, drive circuit and drive circuit Download PDFInfo
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- CN104253594B CN104253594B CN201310265529.1A CN201310265529A CN104253594B CN 104253594 B CN104253594 B CN 104253594B CN 201310265529 A CN201310265529 A CN 201310265529A CN 104253594 B CN104253594 B CN 104253594B
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Abstract
The present invention discloses the operating method of charging module, drive circuit and drive circuit.The charging module is to the control node of preliminary filling one a to pre-charge pressure so that in the case of a control module exports a control voltage, a drive module starts according to the grid voltage added up by the control voltage and the pre-charge pressure.
Description
Technical field
The present invention relates to a kind of electronic circuit.More particularly to a kind of drive circuit, its charging module, and applied to drive
The operating method of dynamic circuit.
Background technology
With the rapid progress of electronics, various drive circuits have been widely used among the life of people.
In general, drive circuit includes power metal oxide semiconductor field-effect transistor (power metal
Oxide semiconductor filed-effect transistor, power MOSFET), power metal-oxide is partly led
Body field-effect transistor according to control voltage to start, to make a driving current be able to pass through power metal-oxide semiconductor
Field-effect transistor, to drive corresponding element (for example as the light-emitting diode (LED) module or electronics of indoor and outdoor lighting equipment
Backlight module of device etc.).On the implementation, because the gate terminal of power metal oxide semiconductor field-effect transistor has coupling
Close electric capacity, therefore the toggle speed of power metal oxide semiconductor field-effect transistor will thus be limited.Consequently, it is possible to when driving
When circuit performs the high frequency Dimming operation of light-emitting diode (LED) module, error or skew will be caused, and further result in Dimming operation
Inaccuracy and drive circuit it is unstable.
Therefore a kind of drive circuit with high toggle speed is proposed.
The content of the invention
The aspect of the present invention is a kind of charging module.According to one embodiment of the invention, the charging module is to preliminary filling
(pre-charge) control node a to pre-charge pressure so that in the case of a control module exports a control voltage, one
Drive module starts according to the grid voltage added up by the control voltage and the pre-charge pressure.The charging module includes one first
Switch, a charge switch and a second switch.The first switch is providing a first voltage to a running node.The charging
Switch corresponding to the first voltage of the running node to open, with the control node that charges.The second switch is to basis
The grid voltage provides a second voltage to the running node.In the case of the grid voltage is more than a predeterminated voltage, this
Two switches provide the second voltage to the running node, to make the charge switch close, to stop the control node that charges.
Another aspect of the present invention is a kind of drive circuit.According to one embodiment of the invention, the drive circuit fills including one
Electric module, a drive module, a sensing module and a control module.The charging module is to the control node of preliminary filling one to one pre-
Charging voltage.The drive module according to the grid voltage added up by a control voltage and the pre-charge pressure to start, so that one
Driving current is able to by the drive module.The sensing module exports to receive the driving current according to the driving current
One feedback voltage.The control module is used in combination to receive a reference voltage, the feedback voltage and a pulse width modulation signal
According to the reference voltage, the feedback voltage and the pulse width modulation signal, to export the control voltage to the drive module.
Another aspect of the present invention is a kind of operating method applied to one drive circuit.According to one embodiment of the invention,
The operating method includes the control node of preliminary filling one to a pre-charge pressure；According to a reference voltage, a feedback voltage and a pulse
Width modulated signal, produce a control voltage；A grid voltage according to being added up by a control voltage and the pre-charge pressure starts
One drive module a, so that driving current is able to by the drive module；And the feedback voltage is produced according to the driving current.
In summary, by applying an above-mentioned embodiment, a kind of charging module can be achieved.And by pre- by charging module
Operation of the control node to pre-charge pressure is filled, can make the drive circuit for possessing this charging module that there is high toggle speed.
Brief description of the drawings
Fig. 1 is the schematic diagram of the drive circuit according to depicted in one embodiment of the invention；
Fig. 2 a are the schematic diagram of the charging module according to depicted in one embodiment of the invention；
Fig. 2 b are the schematic diagram of the charging module according to depicted in another embodiment of the present invention；
Fig. 3 a are the schematic diagram for clicking pulse generator according to depicted in one embodiment of the invention；
Fig. 3 b are the schematic diagram for clicking pulse generator in Fig. 3 a according to depicted in one embodiment of the invention；
Fig. 4 is the flow chart of the operating method according to depicted in one embodiment of the invention；
Fig. 5 a are the thin portion flow chart of the operating method according to depicted in one embodiment of the invention；And
Fig. 5 b are the thin portion flow chart of the operating method according to depicted in another embodiment of the present invention.
Reference numeral explanation
100：Drive circuit VG：Control node
110：Drive module Q：Running node
120：Sensing module VDD：First voltage
130：Control module VSS：Second voltage
140：Charging module VREF：Reference voltage
141：Logic unit VFB：Feedback voltage
142：Click pulse generator PWM：Pulse width modulation signal
1422：Phase inverter VP：Click pulse
1424：Phase inverter IBP：Operation signal
1426：Nor gate CH：Control signal
400：Operating method I：Driving current
SW1-SW7：Switch S1-S4：Step
M：Transistor S11a-S14a：Step
R：Resistance S11b-S17b：Step
C：Coupled capacitor L：End points
Embodiment
The spirit of this disclosure will clearly be illustrated with accompanying drawing and in detail narration below, those skilled in the art are understanding this
After the preferred embodiment of disclosure, the technology that can be taught by this disclosure is changed and modified, and it is without departing from this
The spirit and scope of disclosure.
On " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position, also
Be not used to limit the present invention, its only for distinguish with constructed term description element or operation.
On " electric connection " used herein, two or more elements can be referred to and mutually directly make entity or be electrically connected with
Touch, or mutually put into effect body or in electrical contact indirectly, and " electric connection " can also refer to two or more element mutual operations or dynamic
Make.
The embodiment aspect of the present invention is a kind of drive circuit, and to make narration clear, paragraphs below will be with light emitting diode
Illustrated exemplified by current slot (current sink) circuit of module, but the present invention is not limited.
Fig. 1 is the schematic diagram of the drive circuit 100 according to depicted in one embodiment of the invention.Drive circuit 100 may include
Drive module 110, sensing module 120, control module 130 and charging module 140.In the present embodiment, drive module 110 can
It is electrically connected with sensing module 120, control module 130, charging module 140 and is for electrically connecting to light-emitting diode (LED) module (not
Illustrate) end points L.Sensing module 120 can be electrically connected with control module 130.Control module 130 can be electrically connected with charging module
140。
In the present embodiment, drive module 110 may include that transistor M (is, for example, power metal-oxide-semiconductor field effect
Answer transistor).In addition, in Fig. 1, though transistor M is expressed as N-type transistor, but those skilled in the art can be easily by N-type
Transistor is replaced into P-type transistor, therefore transistor M kenel shown in Fig. 1 not to be limited.Sensing module 120 may include resistance
R.Control module 130 can one or more amplifiers realizations.Transistor M can be electrically connected between end points L and resistance R, and
Transistor M gate terminal (i.e. control node VG) can be electrically connected with control module 130 and charging module 140.In addition, transistor M
Gate terminal can be electrically connected with coupled capacitor C (not illustrating).Resistance R may connect between transistor M and second voltage VSS.
In the present embodiment, charging module 140 is to preliminary filling (pre-charge) control node VG to pre-charge pressure.Driving
Module 110 according to the grid voltage added up by control voltage and pre-charge pressure to start, so that driving current I is able to pass through drive
Dynamic model block 110.Driving current I size corresponds to the size of grid voltage.Sensing module 120 to receive driving current I, and
According to driving current I reset voltages VFB.Control module 130 to receive reference voltage VREF, feedback voltage VFB and
Pulse width modulation signal PWM, and to according to reference voltage VREF, feedback voltage VFB and pulse width modulation signal PWM
Output control voltage to start drive module 110, and adjusts driving current I size to drive module 110.In addition, control mould
Block 130 is also receiving a first voltage VDD and second voltage VSS to be operated.On the other hand, reference voltage VREF can
For fixed voltage, feedback voltage VFB can be changing voltage.
By by the preliminary filling control node VG (i.e. preliminary filling coupled capacitor C) of charging module 140 to pre-charge pressure, mould is being controlled
In the case of 130 output control voltage of block, drive module 110 can be according to the grid voltage added up by control voltage and pre-charge pressure
It is rapid to start.Consequently, it is possible to the startup time span of drive module 110 can be reduced, and cause a kind of with high toggle speed
Drive circuit can be implemented.
For example, in the case where the critical voltage for starting drive module 110 is 0.7V, if charging module 140 can be pre-
Control node VG to 0.5V is filled, then control module 130 only needs control node VG charging to 0.7V by 0.5V to start driving mould
Block 110.Consequently, it is possible to the time span that control module 130 starts drive module 110 can be reduced.
Fig. 2 a are the schematic diagram of the charging module 140 according to depicted in first embodiment of the invention.In the present embodiment, fill
Electric module 140 may include to switch SW1, switch SW2 and switch SW3.Switch SW1 can be electrically connected at first voltage VDD and operation
Between node Q.Switch SW2 can be electrically connected between second voltage VSS and running node Q.Switch SW3 can be electrically connected at the
Between one voltage VDD and control node VG.
In the present embodiment, SW1 is switched to receive operation signal IBP, and it is electric to provide first according to operation signal IBP
Press VDD to running node Q.SW2 is switched to determine whether the grid voltage on control node VG is more than a predeterminated voltage, is used in combination
To provide second voltage VSS to running node Q according to grid voltage.SW3 is switched to the first voltage corresponding to running node Q
VDD is opened, with charge control node VG (i.e. charge couple electric capacity C).When noticing in one embodiment, switch SW1 can be electricity
Stream source.
In addition, in one embodiment, each switch SW1-SW3 all may include that a transistor (is, for example, metal oxide field
Effect transistor).It should be noted that although in fig. 2 a, switch SW1 includes a P-type transistor, and it is brilliant that switch SW2 includes a N-type
Body pipe, and switch SW3 includes a N-type transistor, but those skilled in the art can replace P-type crystal with N-type transistor easily
Pipe, or N-type transistor is replaced with P-type transistor.Therefore, the kenel of the transistor in SW1-SW3 is switched not with shown in Fig. 2 a
It is limited.In addition, in one embodiment, the big I of predeterminated voltage is equal to the size of the critical voltage of the transistor in switch SW2,
And the big I of predeterminated voltage is slightly less than the size of transistor M critical voltage.
In the first operating condition, in the case of grid voltage is not more than predeterminated voltage, switch SW2 is closed.Now, open
SW1 is closed to open and conduct first voltage VDD to running node Q.SW3 is switched to be opened according to running node Q first voltage VDD,
To make control node VG charge, and make grid voltage hoisting.
In the second operating condition, in the case of grid voltage is more than predeterminated voltage, switch SW2 is opened and is conducted second
Voltage VSS to running node Q.Switch SW3 to be closed according to running node Q second voltage VSS, to make control node VG stop filling
Electricity, and grid voltage is stopped lifting.
By so setting, control node VG can be charged to pre-charge pressure, consequently, it is possible to which drive module 110 opens
Dynamic time span can be contracted by, and a kind of drive circuit with high toggle speed can be implemented.
Fig. 2 b are the schematic diagram of the charging module 140 according to depicted in another embodiment of the present invention.In the present embodiment, with
The similar part of embodiment will not be covered herein in Fig. 2 a states.In the present embodiment, charging module 140 can also include a logic unit
141 (are, for example, one and doors) and one click pulse generator 142.The first input end of logic unit 141 is electrically connected at behaviour
Make node Q, the second input of logic unit 141, which is electrically connected at, clicks pulse generator 142, and logic unit 141 is defeated
Go out the gate terminal for the transistor that end is electrically connected with switch SW3.
In this embodiment, logic unit 141 is receiving running node Q first voltage VDD or second voltage VSS simultaneously
Pulse (one-shot pulse) VP is clicked in reception, with the first voltage VDD according to running node Q or second voltage VSS and
Click pulse VP and operatively export Charging signal CH to switching SW3.Click pulse generator 142 and adjusted to receive pulse width
Signal PWM processed, and pulse VP is clicked to logic unit 141 according to pulse width modulation signal PWM outputs.
In this embodiment, it can be pulse signal to click pulse VP, and this pulse signal corresponds to pulse width modulation signal
PWM positive edge (positive edge) and there is high-voltage level, and draw within the short time (such as 2 μ s) and be down to low-voltage electricity
It is flat.In other words, it is identical with pulse width modulation signal PWM phase to click pulse VP phase, and clicks pulse VP work
Cycle (duty cycle) is less than pulse width modulation signal PWM work period.
In the first operating condition, the phase that pulse VP has high-voltage level and grid voltage is not more than predeterminated voltage is clicked
Between in, now switch SW2 close, and switch SW1 open and conduct first voltage VDD to running node Q.Logic unit 141 is defeated
Go out to control signal CH (being, for example, high-voltage level) to switch SW3, opened with order switch SW3, with charge control node VG, to carry
Rise grid voltage.
In the second operating condition, in during grid voltage is more than predeterminated voltage, switch SW2 is opened and is conducted second
Voltage VSS to running node Q.The not output control signal CH of logic unit 141, closed with order switch SW3, to stop charge control
Node VG, and stop lifting grid voltage.
In the third operating condition, in the case of clicking pulse VP and having low voltage level, logic unit 141 does not export
Signal CH is controlled, is closed with order switch SW3, to stop charge control node VG, and stops lifting grid voltage.
By so setting, control node VG can be charged to pre-charge pressure, consequently, it is possible to which drive module 110 opens
Dynamic time span can be contracted by, and a kind of drive circuit with high toggle speed can be implemented.
In addition, by so setting, control node VG is set to be only that clicking pulse VP has a case that high-voltage level
Under be electrically charged, consequently, it is possible to can realize that control node VG's overcharges protection mechanism.
Reference picture 3a and Fig. 3 b.Fig. 3 a are to click showing for pulse generator 142 according to depicted in one embodiment of the invention
It is intended to.Clicking pulse generator 142 may include phase inverter 1422, phase inverter 1424 and nor gate 1426.Phase inverter 1422 is used
It is anti-phase to produce one to receive pulse width modulation signal PWM, and to anti-phase (invert) pulse width modulation signal PWM
Pulse width modulation signal.Phase inverter 1424 is to receive anti-phase pulse width modulation signal, and to anti-phase and postpone
Anti-phase pulse width modulation signal, to produce the pulse width modulation signal of delay.Nor gate 1426 is anti-phase to receive
Pulse width modulation signal and the pulse width modulation signal of delay, according to anti-phase pulse width modulation signal and to prolong
Slow pulse width modulation signal produces and clicks pulse VP.
Fig. 3 b are the schematic diagram for clicking pulse generator 142 in Fig. 3 a according to depicted in one embodiment of the invention.
In the present embodiment, clicking pulse generator 142 may include phase inverter 1422, nor gate 1426 and switch SW4-SW7.Click arteries and veins
The annexation for rushing each element in generator 142 can refer to shown in Fig. 3 b, will not be described here.
By above-mentioned setting, clicking pulse generator 142 can be implemented.
Another aspect of the present invention is a kind of operating method 400.This operating method 400 can be applied to structure with it is foregoing
Same or similar drive circuit in Fig. 1.For convenience of description, the system of operations described below method 400 is with the drive circuit 100 shown in Fig. 1
Exemplified by be described, but be not limited with Fig. 1 drive circuit 100
When noticing in the step in following operating method 400, that, unless otherwise stated, and without specific suitable
Sequence.In addition, following steps may be also performed simultaneously, or overlapped in performing on the time
Referring concurrently to the flow chart that Fig. 1 and Fig. 4, Fig. 4 are the operating method 400 according to depicted in one embodiment of the invention.
Operating method 400 comprises the following steps.Pass through charging module 140, preliminary filling control node VG to pre-charge pressure (step S1).Pass through
Control module 130, according to reference voltage VREF, a feedback voltage VFB and pulse width modulation signal PWM, produce control electricity
Press (step S2).Grid voltage according to being added up by control voltage and pre-charge pressure starts drive module 110, so that driving current
I is able to by drive module 110 (step S3).By sensing module 120, feedback voltage VFB (steps are produced according to driving current I
Rapid S3).
By above-mentioned method, the startup time span of drive module 110 can be reduced.
Referring concurrently to Fig. 2 a and Fig. 5 a, in one embodiment, step S1 comprises the following steps.First, by switching SW1,
First voltage VDD to a running node Q (step S11a) is provided.Then, opened according to running node Q first voltage VDD
SW3 is closed, with charge control node VG, to lift grid voltage (step S12a).Then, by switching SW2, grid voltage is judged
Whether predeterminated voltage (step S13a) is more than.If so, second voltage VSS to running node Q then is provided by switching SW2, with order
Switch SW3 to close, to stop charge control node VG, to make grid voltage stop lifting (step S14a).If it is not, then return to step
Rapid S12a.
In one embodiment, step S14a includes a step, and this step is to carry by the transistor in SW2 is switched
For second voltage VSS to running node Q.The big I of above-mentioned predeterminated voltage is equal to the critical voltage of the transistor in switch SW2
Size.
On the other hand, reference picture 2b, Fig. 3 a and Fig. 5 b.In one embodiment, step S1 comprises the following steps.Pass through switch
SW1, there is provided first voltage VDD to running node Q (step S11b).By clicking pulse generator 142, adjusted according to pulse width
Signal PWM processed is produced and is clicked pulse VP (step S12b).By logic unit (being, for example, and door) 141, with to running node Q's
First voltage VDD or second voltage VSS and click pulse VP carry out logic connection (logical conjunction), with behaviour
Operatively produce control signal CH (being, for example, high-voltage level) (step S13b).Judge that control signal CH is by switching SW3
It is no to produce (step S14b).If it is not, then continue executing with step S14b.Opened if so, then switching SW3, with charge control node VG,
To lift grid voltage (step S15b).Then, by switching SW2, judge whether grid voltage is more than predeterminated voltage (step
S16b).If so, then providing second voltage VSS to running node Q by switching SW2, closed with order switch SW3, to stop charging
Control node VG, to make grid voltage stop lifting (step S17b).If it is not, then continue executing with step S16b.
When the correlative detail for noticing predeterminated voltage refers to previous embodiment, therefore do not repeat herein.
In addition, in one embodiment, it is identical with pulse width modulation signal PWM phase to click pulse VP phase,
And the work period for clicking pulse VP is less than pulse width modulation signal PWM work period.
Furthermore in one embodiment, step S12b may include following steps.Pass through phase inverter 1422, rp pulse width
Modulating signal PWM, to produce anti-phase pulse width modulation signal.By phase inverter 1424, the anti-phase and anti-phase pulse of delay
Width modulated signal, to produce the pulse width modulation signal of delay.By nor gate 1426, to anti-phase pulse width modulation
Signal and the pulse width modulation signal of delay carry out ETTHER-OR operation, and pulse VP is clicked operatively to produce.
Although the present invention is disclosed as above with embodiment, so it is not limited to the present invention, and those skilled in the art exist
On the premise of not departing from the spirit and scope of the present invention, it can be used for a variety of modifications and variations, therefore protection scope of the present invention is
It is defined by the claim of the present invention.
Claims (15)
1. a kind of charging module, to the control node of preliminary filling one a to pre-charge pressure so that in the control of control module output one
In the case of voltage, a drive module starts according to the grid voltage added up by the control voltage and the pre-charge pressure, wherein
The charging module includes：
One first switch, to provide a first voltage to a running node；
One charge switch, to be opened corresponding to the first voltage of the running node, with the control node that charges；And
One second switch, to provide a second voltage to the running node according to the grid voltage,
Wherein in the case of the grid voltage is more than a predeterminated voltage, the second switch provides the second voltage to the operation section
Point, to make the charge switch close, to stop the control node that charges.
2. charging module as claimed in claim 1, the wherein second switch include a transistor, the predeterminated voltage and the crystal
The critical voltage of pipe is equal.
3. charging module as claimed in claim 1, in addition to：
One logic unit, pulse is clicked to receive the first voltage of the running node or the second voltage and receive one, with
According to the first voltage of the running node or the second voltage and a Charging signal is exported according to this with clicking pulse operation,
To make the charge switch open.
4. charging module as claimed in claim 3, in addition to：
One clicks pulse generator, clicks pulse to produce this according to a pulse width modulation signal, wherein this clicks pulse
Phase it is identical with the phase of the pulse width modulation signal, and the work period for clicking pulse be less than the pulse width modulation
The work period of signal.
5. charging module as claimed in claim 4, wherein this is clicked pulse generator and included：
One first phase inverter, to receive the pulse width modulation signal, and to the anti-phase pulse width modulation signal, with production
A raw anti-phase pulse width modulation signal；
One second phase inverter, to receive the anti-phase pulse width modulation signal, and to anti-phase and postpone the anti-phase arteries and veins
Width modulated signal is rushed, to produce the pulse width modulation signal of a delay；And
One nor gate, to receive the pulse width modulation signal of the anti-phase pulse width modulation signal and the delay, with
This is produced according to the pulse width modulation signal of the anti-phase pulse width modulation signal and the delay and clicks pulse.
6. charging module as claimed in claim 3, wherein in the case of this is clicked pulse and has a first voltage level, should
Logic unit not output control signal, to make the charge switch close, to stop the control node that charges.
7. charging module as claimed in claim 6, wherein clicking pulse at this there is a second voltage level and the control section
In the case of the grid voltage of point is not more than the predeterminated voltage, the logic unit exports the control signal, to make the charging open
Close and open, with the control node that charges.
8. a kind of drive circuit, including：
One charging module, to the control node of preliminary filling one a to pre-charge pressure；
One drive module, to be started according to the grid voltage added up by a control voltage and the pre-charge pressure, so that one drives
Streaming current is able to by the drive module；
One sensing module, to receive the driving current, and a feedback voltage is exported according to the driving current；And
One control module, to receive a reference voltage, the feedback voltage and a pulse width modulation signal, and to basis
The reference voltage, the feedback voltage and the pulse width modulation signal, export the control voltage to the drive module；
Wherein the charging module includes：
One first switch, it is electrically connected between a first voltage and a running node, the wherein first switch is conducting this
First voltage is to the running node；
One charge switch, be electrically connected between the first voltage and the control node, wherein the charge switch to corresponding to
The first voltage of the running node is opened, with the control node that charges；And
One second switch, it is electrically connected between a second voltage and a running node, wherein the second switch is in the grid
During pole tension is more than during a predeterminated voltage, the second voltage is conducted to the running node, operatively to close the charging
Switch.
9. drive circuit as claimed in claim 8, the wherein drive module include a transistor, the predeterminated voltage is less than the drive
The critical voltage of the transistor in dynamic model block.
10. drive circuit as claimed in claim 8, the wherein charging module also include：
One logic unit, pulse is clicked to receive the first voltage of the running node or the second voltage and receive one, with
According to the first voltage of the running node or the second voltage and a Charging signal is exported according to this with clicking pulse operation,
To make the charge switch open.
11. drive circuit as claimed in claim 10, the wherein charging module also include：
One clicks pulse generator, clicks pulse to produce this according to the pulse width modulation signal, wherein this clicks pulse
Phase it is identical with the phase of the pulse width modulation signal, and the work period for clicking pulse be less than the pulse width modulation
The work period of signal.
12. drive circuit as claimed in claim 11, wherein this is clicked pulse generator and also included：
One first phase inverter, to receive the pulse width modulation signal, and to the anti-phase pulse width modulation signal, with production
A raw anti-phase pulse width modulation signal；
One second phase inverter, to receive the anti-phase pulse width modulation signal, and to anti-phase and postpone the anti-phase arteries and veins
Width modulated signal is rushed, to produce the pulse width modulation signal of a delay；And
One nor gate, to receive the pulse width modulation signal of the anti-phase pulse width modulation signal and the delay, with
This is produced according to the pulse width modulation signal of the anti-phase pulse width modulation signal and the delay and clicks pulse.
13. drive circuit as claimed in claim 10, wherein in the case of this is clicked pulse and has a first voltage level,
The logic unit not output control signal, to make the charge switch close, to stop the control node that charges.
14. drive circuit as claimed in claim 13, wherein clicking pulse at this there is a second voltage level and the control
In the case of the grid voltage of node is not more than the predeterminated voltage, the logic unit exports the control signal, to make the charging
Switch is opened, with the control node that charges.
15. drive circuit as claimed in claim 8, the wherein second switch include a transistor, the predeterminated voltage with this
The critical voltage of the transistor in two switches is equal.
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| CN109792814B (en) * | 2016-09-23 | 2022-04-08 | 锋翔科技公司 | Pre-charged lighting control circuit |
| US9916896B1 (en) * | 2016-11-01 | 2018-03-13 | Globalfoundries Inc. | Ternary content addressable memory (TCAM) for multi bit miss detect circuit |
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| US8072196B1 (en) * | 2008-01-15 | 2011-12-06 | National Semiconductor Corporation | System and method for providing a dynamically configured low drop out regulator with zero quiescent current and fast transient response |
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