CN104579170A - Relaxation oscillator - Google Patents
Relaxation oscillator Download PDFInfo
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- CN104579170A CN104579170A CN201310513318.5A CN201310513318A CN104579170A CN 104579170 A CN104579170 A CN 104579170A CN 201310513318 A CN201310513318 A CN 201310513318A CN 104579170 A CN104579170 A CN 104579170A
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- amplifier
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- voltage signal
- relaxation oscillator
- reference voltage
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Abstract
The invention relates to a relaxation oscillator which comprises a first amplifier and a second amplifier, wherein the first amplifier is provided with a first input end for receiving an output voltage signal, a second input end for receiving a reference voltage signal and an output end for comparing the output voltage signal with the reference voltage signal and responding comparison results to output a control signal; the second amplifier is provided with a first input end for receiving the output voltage signal, a second input end connected to the output end of the first amplifier to receive the control signal and an output end connected to the first input end of the first amplifier and the first input end of the second amplifier and used for comparing the control signal with the output voltage signal and responding comparison results to output the output voltage signal. The output voltage signal is a periodic oscillation signal with a non-sinusoidal waveform. According to the relaxation oscillator, the problem of clock pulse feed-in can be completely solved, the use area of a circuit board and the cost can be reduced, and noise in a circuit can be reduced.
Description
Technical field
The present invention has about a kind of relaxation oscillator, relates to a kind of for the relaxation oscillator in contact panel especially.
Background technology
Oscillator (oscillator) is generally used to produce the electronic circuit with periodic analog signal.In general, oscillator is mainly divided into two kinds, and one is harmonic oscillator (harmonic oscillator), and it is the circuit relying on the self-oscillation of circuit and produce sinewave output voltage; Another is relaxation oscillator (relaxation oscillator).Relaxation oscillator is used for producing the output voltage of non-sinusoidal waveform, the such as output voltage of square wave, sawtooth waveforms or triangular wave, containing, for example the non-linear component of transistor and so in it, the energy cycle be stored in electric capacity or inductance to be discharged, signal output waveform is changed instantaneously.On the other hand, due to the rise of intelligent mobile phone and tablet computer, contact panel (touch panel) is also widely used as user input signal gradually to the interface of main frame.Contact panel general now can adopt the technology of relaxation oscillator usually, senses the frequency change of the voltage that the electric capacity on the touch point of user on contact panel produces, and provides the processor giving rear class to analyze.
In recent years, the technical research report of many relaxation oscillators has been had to be published.The publication of these technical research results comprises, such as, the US Patent No. 7375535 of Ku Zi (Kutz et al.), the US Patent No. 7307485 of Shi Naide (Snyder et al.), the US Patent No. 8159462 of Sai Qiuen (Seguine), and the US Patent No. 8058937 of the Qin (Qin et al.).But, the circuit structure of the relaxation oscillator that these lists of references above-mentioned propose, output node all can arrange a switch with field-effect transistors (field-effect transistor switch, FET switch), its signal input part and signal output part be connected to for the current source of capacitor charging/electric discharge and be used for producing periodic oscillator signal electric capacity between.Therefore, relaxation oscillator disclosed by aforesaid list of references all can produce the problem of clock pulse feed-in (clock feedthrough), cause the variation (offset) of the output signal of switch with field-effect transistors, and then affect the operation accuracy of oscillator.
In addition, old (Chen) discloses a kind of relaxation oscillator in US Patent No. 8373502.Relaxation oscillator in this section of list of references is made up of transduce amplifier (operational transconductance amplifier) and an operational amplifier (operational amplifier) of computing, and contains six switches and switch and be input to computing and transduce a pair reference voltage of a pair input of amplifier and the non-inverting input of operational amplifier.In this section of list of references, the output current signal of computing transduction amplifier carries out charge/discharge operation to an electric capacity, to produce periodic swinging signal, and the voltage signal that its output current signal is formed on electric capacity, the inverting input of operational amplifier can be input to.A pair output frequency signal of operational amplifier is complimentary to one another and be sent to the control end of six switches, to control their switching manipulation.Although switch is not connected to between the current source of charge/discharge and the electric capacity being used for producing periodic oscillator signal by this section of list of references, and can avoid the problem of clock pulse feed-in.But, the reference voltage that the relaxation oscillator disclosed by this section of list of references needs nearly six transistor switches to select wish to input, and many board area can be taken and increase cost, and the noise in circuit can be increased.
For the problems referred to above, the present invention proposes a kind of relaxation oscillator, and it under the circuit design adopting minimal switches assembly, can solve the problem caused by clock pulse feed-in.
Summary of the invention
Main purpose of the present invention is to provide a kind of relaxation oscillator, the output node of wherein relaxation oscillator does not arrange any switch, and thoroughly can solve the problem of clock pulse feed-in (clock feedthrough).
Secondary objective of the present invention is to provide a kind of relaxation oscillator, and it can use the switch module of minimal number, and then reduces the usable floor area of circuit board and minimizing cost, and reduces the noise in circuit.
The invention provides a kind of relaxation oscillator.This relaxation oscillator comprises: one first amplifier, there is to receive a first input end of an output voltage signal, in order to receive one second input and an output of a reference voltage signal, this first amplifier in order to compare this output voltage signal and this reference voltage signal, and response ratio compared with result export a control signal; One second amplifier, there is to receive a first input end of this output voltage signal, be connected to the output of this first amplifier to receive one second input of this control signal and to be connected to an output of the first input end of this first amplifier and the first input end of this second amplifier, this second amplifier in order to compare this control signal and this output voltage signal, and response ratio compared with result export this output voltage signal.This output voltage signal is a periodic swinging signal with non-sinusoidal waveform waveform.
Relaxation oscillator of the present invention also comprises: a switch combination, be connected to the second input of this first amplifier, one first reference voltage or one second reference voltage the second input to this first amplifier is optionally connected, using as this reference voltage signal in order to the driving via this control signal.
Relaxation oscillator of the present invention, this first reference voltage has different level from this second reference voltage.
Relaxation oscillator of the present invention, also comprise: a sense capacitance, between the output being connected to this second amplifier and an earth terminal, carry out charge and discharge operation in order to drive via the output of this second amplifier, produce this output voltage signal whereby.
Relaxation oscillator of the present invention, the first input end of this first amplifier is a non-inverting input, and the second input of this first amplifier is an inverting input; And the first input end of this second amplifier is a non-inverting input, and the second input of this second amplifier is an inverting input.
Relaxation oscillator of the present invention, this first amplifier is made up of an operational amplifier, and this second amplifier is made up of an operational amplifier.
Relaxation oscillator of the present invention, this first amplifier is made up of a computing transduction amplifier, and this second amplifier is made up of an operational amplifier.
Relaxation oscillator of the present invention, this first amplifier is made up of an operational amplifier, and this second amplifier is made up of a computing transduction amplifier.
Relaxation oscillator of the present invention, this first amplifier is made up of a computing transduction amplifier, and this second amplifier is made up of a computing transduction amplifier.
Accompanying drawing explanation
Fig. 1 is the main circuit structure chart of relaxation oscillator of the present invention.
Fig. 2 A is the circuit structure diagram of the relaxation oscillator according to the first embodiment of the present invention.
Fig. 2 B is the circuit structure diagram of relaxation oscillator according to a second embodiment of the present invention.
Fig. 2 C is the circuit structure diagram of relaxation oscillator according to the third embodiment of the invention.
Fig. 2 D is the circuit structure diagram of relaxation oscillator according to a fourth embodiment of the invention.
The circuit that the main circuit structure that Fig. 3 A shows the relaxation oscillator of the present invention shown in Fig. 1 operates in the first mode of operation connects framework.
The circuit that the main circuit structure that Fig. 3 B shows the relaxation oscillator of the present invention shown in Fig. 1 operates in the second mode of operation connects framework.
Fig. 4 A is according to the voltage waveform on the main circuit node of the relaxation oscillator of the first embodiment of the present invention and the second embodiment.
Fig. 4 B is the voltage waveform according to the third embodiment of the invention and on the main circuit node of the relaxation oscillator of the 4th embodiment.
Embodiment
Hereafter for introducing most preferred embodiment of the present invention.Each embodiment in order to principle of the present invention to be described, but is not used to limit the present invention.Scope of the present invention ought be attached in the past claim be as the criterion.
Fig. 1 is the main circuit structure chart of relaxation oscillator of the present invention.Relaxation oscillator of the present invention is applicable in contact panel, but is not limited to this type of application.Please refer to Fig. 1, relaxation oscillator of the present invention comprises one first amplifier AMP1, one second amplifier AMP2, an a switch combination S1 and sense capacitance C
f.First amplifier AMP1 has an inverting input, a non-inverting input and an output, wherein the output of the first amplifier AMP1 is connected to an inverting input of the second amplifier AMP2, and the inverting input of the first amplifier AMP1 is connected to a reference voltage signal V
r.Switch combination S1 is connected to the inverting input of the first amplifier AMP1, and it is used for a high reference voltage V
hor a low pressure reference voltage V
lbe connected to the inverting input of the first amplifier AMP1, with signal V as the reference voltage
r.Second amplifier AMP2 has an inverting input to receive a control signal V
c, wherein control signal V
cit is the output voltage signal of the first amplifier AMP1.In addition, the second amplifier AMP2 has a non-inverting input and an output in addition, and wherein the output of the second amplifier AMP2 feeds back to the non-inverting input of the second amplifier AMP2 and is connected to the non-inverting input of the first amplifier AMP1.First amplifier AMP1 is in order to the voltage signal that compares its non-inverting input and receive and reference voltage signal V
r, and response ratio compared with result, via its output export control signal V
c.Second amplifier AMP2 is in order to the voltage signal that compares its non-inverting input and receive and control signal V
c, and response ratio compared with result, export an output voltage signal V via its output
o.
Sense capacitance C
fbetween the output being connected to the second amplifier AMP2 and an earth terminal, it is in order to sense user to point the operation by human hand of touching contact panel (not shown), and its capacitance is between 10pF to 100pF.Sense capacitance C
foutput via the second amplifier AMP2 carries out charge/discharge operation to it, and produces output voltage signal V
o, output voltage signal V
ofor the oscillator signal of one-period, and its waveform is sawtooth waveforms or triangular wave.Moreover, control signal V
cthe control end of switch combination S1 can be sent to, with the handover operation of control switch combination S 1.Switch combination S1 is normally made up of pair of transistor switch (not shown), and the signal input part of one of them transistor switch is connected to high reference voltage V
hand the signal input part of another one transistor switch is connected to low reference voltage V
l, and the control end of one of them transistor switch is connected to control signal V
c, the control end of another one transistor switch is connected to control signal V via a reverser (inverter does not show)
c.Therefore, the first amplifier AMP1 is under being biased in degenerative configuration.Output voltage signal V on the output of the second amplifier AMP2
othe non-inverting input of the second amplifier AMP2 can be applied in the mode of positive feedback, and be connected to the non-inverting input of the first amplifier AMP1.Therefore, the second amplifier AMP2 is under the configuration being biased in positive feedback.
Refer to Fig. 2 A and Fig. 2 B, it shows the circuit structure diagram according to the circuit structure diagram of the relaxation oscillator of the first embodiment of the present invention and relaxation oscillator according to a second embodiment of the present invention respectively.Please first see Fig. 1 and Fig. 2 A, in the first embodiment of the present invention, the first amplifier AMP1 shown in Fig. 1 is made up of an operational amplifier 320, and the second amplifier AMP2 shown in Fig. 1 is made up of a computing transduction amplifier 340, as shown in Figure 2 A.Refer to Fig. 1 and Fig. 2 B, in the second embodiment of the present invention, the first amplifier AMP1 shown in Fig. 1 is made up of a computing transduction amplifier 340, and the second amplifier AMP2 shown in Fig. 1 is also made up of a computing transduction amplifier 340, as shown in Figure 2 B.
Refer to Fig. 2 C and Fig. 2 D, it shows the circuit structure diagram of relaxation oscillator according to the third embodiment of the invention and the circuit structure diagram of relaxation oscillator according to a fourth embodiment of the invention respectively.Please first see Fig. 1 and Fig. 2 C, in the third embodiment of the present invention, the first amplifier AMP1 shown in Fig. 1 is made up of a computing transduction amplifier 340, and the second amplifier AMP2 shown in Fig. 1 is made up of an operational amplifier 320, as shown in Figure 2 C.Refer to Fig. 1 and Fig. 2 D, in the fourth embodiment of the present invention, the first amplifier AMP1 shown in Fig. 1 is made up of an operational amplifier 320, and the second amplifier AMP2 shown in Fig. 1 is also made up of an operational amplifier 320, as shown in Figure 2 D.
In the preferred embodiment, the first amplifier AMP1 and the second amplifier AMP2 all can be one computing transduction amplifier 340 or an operational amplifier 320 formed.No matter the second amplifier AMP2 is formed by computing transduction amplifier 340 or operational amplifier 320, when the second amplifier AMP2 is to sense capacitance C
fduring charge and discharge, its input can be considered as an electric capacity.Therefore, if the first amplifier AMP1 is formed by an operational amplifier 320, the 4th embodiment shown in the first embodiment as shown in Figure 2 A and Fig. 2 D is general, and the output signal of the first amplifier AMP1 is control signal V
c.If the first amplifier AMP1 by one computing transduction amplifier 340 formed, the 3rd embodiment shown in the second embodiment as shown in Figure 2 B and Fig. 2 C is general, and the output signal of the first amplifier AMP1 can be input to the inverting input of the second amplifier AMP2 and formation control signal V
c.
Next, the mode of operation of relaxation oscillator of the present invention will describe in detail as after.Refer to Fig. 3 A-3B, and Fig. 4 A-4B, the circuit that the main circuit structure that wherein Fig. 3 A shows the relaxation oscillator of the present invention shown in Fig. 1 operates in the first mode of operation connects framework, and the circuit that the main circuit structure that Fig. 3 B shows the relaxation oscillator of the present invention shown in Fig. 1 operates in the second mode of operation connects framework.Fig. 4 A is according to the voltage waveform on the main circuit node of the relaxation oscillator of the first embodiment of the present invention and the second embodiment.Fig. 4 B is the voltage waveform according to the third embodiment of the invention and on the main circuit node of the relaxation oscillator of the 4th embodiment.As previously mentioned, under the second amplifier AMP2 is biased in the configuration of positive feedback, that is the non-inverting input of the second amplifier AMP2 is connected to output to receive output voltage signal V
o, and the inverting input of the second amplifier AMP2 is connected to the output of the first amplifier AMP1 with reception control signal V
c.Therefore, the second amplifier AMP2 can compare the voltage signal that two inputs receive.When the level of the voltage signal on the non-inverting input of the second amplifier AMP2 is greater than the level of the voltage signal on inverting input, the output of the second amplifier AMP2 can to sense capacitance C
fcharging.Otherwise when the level of the voltage signal on the inverting input of the second amplifier AMP2 is greater than the level of the voltage signal on non-inverting input, the output of the second amplifier AMP2 can drive sense capacitance C
felectric discharge.Control signal V on the output of the first amplifier AMP1
cbe connected to the inverting input of the second amplifier AMP2, with the output as control second amplifier AMP2 to sense capacitance C
fcarry out the foundation of charge or discharge.Control signal V on the output of the first amplifier AMP1
clevel when being high, the output of the second amplifier AMP2 drives sense capacitance C
fdischarge.Otherwise, the control signal V on the output of the first amplifier AMP1
clevel when being low, the output of the second amplifier AMP2 is to sense capacitance C
fcharge.Moreover the first amplifier AMP1 is under being biased in degenerative configuration, and time at the beginning, switch combination S1 can switch to high reference voltage V
hbe connected to the inverting input of the first amplifier AMP1, make reference voltage signal V
rvoltage level be high reference voltage V
h.Now relaxation oscillator can operate in the flrst mode, as shown in Figure 3A.The non-inverting input of the first amplifier AMP1 is connected to the output of the second amplifier AMP2 to receive output voltage signal V
o, the reference voltage signal V on its inverting input
rlevel be chosen as high reference voltage V through switch combination S1
h.Now output voltage signal V
olevel be less than reference voltage signal V
rlevel, that is as output voltage signal V
olevel be less than reference voltage signal V
rlevel time, the control signal V on the output of the first amplifier AMP1
clevel be low, drive the output of the second amplifier AMP2 to sense capacitance C whereby
fcharging.Further, output voltage signal V
olevel can rise gradually, as the voltage waveform shown in before the time point t1 in Fig. 4 A and Fig. 4 B.Therefore in Fig. 4 A and Fig. 4 B, before time point t1, reference voltage signal V
rlevel be high reference voltage V
h, control signal V
clevel be low, and sense capacitance C
fcharging can be carried out and make output voltage signal V
olevel rise gradually.When putting t1 time of advent time, output voltage signal V
olevel rise arrive senior staff officer examine voltage V
h.Now, switch combination S1 can switch to low reference voltage V
lbe connected to the inverting input of the first amplifier AMP1, make reference voltage signal V
rvoltage level be low reference voltage V
l.Now relaxation oscillator can operate under the second mode, as shown in Figure 3 B.In this case, the reference voltage signal V on the inverting input of the first amplifier AMP1
rlevel be chosen as low reference voltage V through switch combination S1
l.Now, due to low reference voltage V
lbe selected as reference voltage signal V
rlevel, the control signal V on the output of the first amplifier AMP1
clevel just can change height into, cause the second amplifier AMP2 output drive sense capacitance C
felectric discharge, makes the output voltage signal V on the output of the second amplifier AMP2 whereby
ostart gradually to decline, the voltage waveform as shown in the time interval t1-t2 in Fig. 4 A and Fig. 4 B.Therefore in Fig. 4 A and Fig. 4 B, in time interval t1-t2, reference voltage signal V
rlevel be low reference voltage V
l, control signal V
clevel be high, and sense capacitance C
fcontinuous discharge makes output voltage signal V
olevel decline gradually.When putting t2 time of advent time, output voltage signal V
olevel decline arrive low reference voltage V
l.Now, switch combination S1 can switch to high reference voltage V
hbe connected to the inverting input of the first amplifier AMP1, make reference voltage signal V
rvoltage level be high reference voltage V
h.Now the operator scheme of relaxation oscillator can get back to the first mode shown in Fig. 3 A, makes control signal V
clevel transitions be low to drive the output of the second amplifier AMP2 to sense capacitance C
fcharging, and output voltage signal V
olevel can rise gradually, and arrive high reference voltage V when time point t3
h.After this sense capacitance C
fjust can in time interval t3-t4, t4-t5, t5-t6 the process of its charge and discharge of repetitive cycling, and form output voltage signal V
o, output voltage signal V
ofor the oscillator signal of one-period.Therefore, about the operation of relaxation oscillator of the present invention in time interval t3-t4, t4-t5, t5-t6, will not be repeated at this.
It should be noted that in the second embodiment of the present invention shown in the first embodiment of the present invention shown in Fig. 2 A and Fig. 2 B at this, the second amplifier AMP2 is all by amplifier 340 of being transduceed by a computing is formed.Typically, the output stage of computing transduction amplifier 340 is a current source.Therefore, if utilize computing transduce amplifier 340 output on current source to sense capacitance C
fcharging or to sense capacitance C
felectric discharge, sense capacitance C
fcharge rate and sense capacitance C
fdischarge rate can be equal, therefore computing transduction amplifier 340 output on output voltage signal V
owaveform slope at rising edge can be equal with the waveform slope at falling edge, as shown in the oscillogram of Fig. 4 A.But in the fourth embodiment of the present invention shown in the third embodiment of the present invention shown in Fig. 2 C and Fig. 2 D, the second amplifier AMP2 is all by being made up of an operational amplifier 320.The NMOS commonsource amplifier (NMOS common-source amplifier with current source bias) that the output stage of operational amplifier is a current source bias voltage or the common emitter amplifier (common-emitter amplifier) of a current source bias voltage is formed.Therefore, if utilize bias current source on the output of operational amplifier 320 to sense capacitance C
fcharging, operational amplifier 320 is that the amplifier of the current source bias voltage utilized on output drives sense capacitance C
felectric discharge, due to the electrical characteristic of commonsource amplifier or common emitter amplifier, can make sense capacitance C
fdischarge rate accelerate.Therefore, if utilize amplifier on the output of operational amplifier 320 to sense capacitance C
felectric discharge, sense capacitance C
fdischarge rate can far away higher than sense capacitance C
fcharge rate, the output voltage signal V on the output of therefore operational amplifier 320
ocan far away higher than the waveform slope of rising edge at the waveform slope of falling edge, as shown in the oscillogram of Fig. 4 B.
By relaxation oscillator of the present invention and aforesaid existing relaxation oscillator, such as storehouse United States Patent (USP) hereby, the United States Patent (USP) of Shi Naide, the United States Patent (USP) of Sai Qiuen, and the United States Patent (USP) of the Qin compares mutually, can understand that main distinguishing feature is between the two, relaxation oscillator of the present invention uses amplifier as the output stage of relaxation oscillator, replaces existing relaxation oscillator and use the next output stage as relaxation oscillator of the combination of current source and switch.Therefore, relaxation oscillator of the present invention just can avoid the shortcoming causing voltage error sense capacitance being carried out to charge and discharge with aforesaid existing relaxation oscillator because producing clock pulse feed-in effect.In addition, relaxation oscillator of the present invention is compared mutually with old United States Patent (USP), although the problem that old relaxation oscillator does not have clock pulse feed-in can be perceived, old relaxation oscillator not only has different circuit configurations and topology from relaxation oscillator of the present invention, and the present invention only needs use two switches, but not as old relaxation oscillator, need use six switches.Therefore compare mutually with old relaxation oscillator, the present invention can use the switch module of minimal number, and then reduces the usable floor area of circuit board and the noise reducing cost and reduce in circuit.Therefore, the present invention is enough to the shortcoming that solution prior art runs into.
The circuit framework of relaxation oscillator of the present invention is specified in this.The foregoing is only present pre-ferred embodiments; so itself and be not used to limit scope of the present invention; anyone familiar with this technology; without departing from the spirit and scope of the present invention; can do on this basis and further improve and change, the scope that therefore protection scope of the present invention ought define with claims of the application is as the criterion.
Being simply described as follows of symbol in accompanying drawing:
AMP1 ~ the first amplifier; AMP2 ~ the second amplifier; S1 ~ switch combination; CF ~ sense capacitance; VH, VL ~ high/low reference voltage; VR ~ reference voltage signal; VC ~ control signal; VO ~ output voltage signal; 320 ~ operational amplifier; 340 ~ computing transduction amplifier.
Claims (9)
1. a relaxation oscillator, is characterized in that, comprising:
One first amplifier; there is to receive a first input end of an output voltage signal, in order to receive one second input and an output of a reference voltage signal; this first amplifier in order to compare this output voltage signal and this reference voltage signal, and response ratio compared with result export a control signal; And
One second amplifier; there is to receive a first input end of this output voltage signal, be connected to the output of this first amplifier to receive one second input of this control signal and to be connected to an output of the first input end of this first amplifier and the first input end of this second amplifier; this second amplifier in order to compare this control signal and this output voltage signal, and response ratio compared with result export this output voltage signal;
Wherein this output voltage signal is a periodic swinging signal with non-sinusoidal waveform waveform.
2. relaxation oscillator according to claim 1, is characterized in that, also comprises:
One switch combination, is connected to the second input of this first amplifier, optionally connects one first reference voltage or one second reference voltage the second input to this first amplifier in order to the driving via this control signal, using as this reference voltage signal.
3. relaxation oscillator according to claim 2, is characterized in that, this first reference voltage has different level from this second reference voltage.
4. relaxation oscillator according to claim 1, is characterized in that, also comprises:
One sense capacitance, between the output being connected to this second amplifier and an earth terminal, carries out charge and discharge operation in order to drive via the output of this second amplifier, produces this output voltage signal whereby.
5. relaxation oscillator according to claim 1, is characterized in that,
The first input end of this first amplifier is a non-inverting input, and the second input of this first amplifier is an inverting input; And
The first input end of this second amplifier is a non-inverting input, and the second input of this second amplifier is an inverting input.
6. relaxation oscillator according to claim 1, is characterized in that,
This first amplifier is made up of an operational amplifier, and this second amplifier is made up of an operational amplifier.
7. relaxation oscillator according to claim 1, is characterized in that,
This first amplifier is made up of a computing transduction amplifier, and this second amplifier is made up of an operational amplifier.
8. relaxation oscillator according to claim 1, is characterized in that,
This first amplifier is made up of an operational amplifier, and this second amplifier is made up of a computing transduction amplifier.
9. relaxation oscillator according to claim 1, is characterized in that,
This first amplifier is made up of a computing transduction amplifier, and this second amplifier is made up of a computing transduction amplifier.
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| CN201310513318.5A CN104579170B (en) | 2013-10-25 | 2013-10-25 | relaxation oscillator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108270441A (en) * | 2017-01-04 | 2018-07-10 | 京东方科技集团股份有限公司 | The adjustable frequency source of frequency and relevant system, method and electronic equipment |
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| CN101197115A (en) * | 2006-12-07 | 2008-06-11 | 鸿富锦精密工业（深圳）有限公司 | Automatic brightness regulation circuit of display equipment |
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| US8373502B1 (en) * | 2011-09-20 | 2013-02-12 | Hong Kong Applied Science and Technology Research Institute Company Limited | Gm-C filter tuning circuit based on relaxation oscillator |
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2013
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101197115A (en) * | 2006-12-07 | 2008-06-11 | 鸿富锦精密工业（深圳）有限公司 | Automatic brightness regulation circuit of display equipment |
| CN101951223A (en) * | 2010-10-12 | 2011-01-19 | 苏州大学 | Low-power consumption oscillator circuit |
| US8373502B1 (en) * | 2011-09-20 | 2013-02-12 | Hong Kong Applied Science and Technology Research Institute Company Limited | Gm-C filter tuning circuit based on relaxation oscillator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108270441A (en) * | 2017-01-04 | 2018-07-10 | 京东方科技集团股份有限公司 | The adjustable frequency source of frequency and relevant system, method and electronic equipment |
| CN108270441B (en) * | 2017-01-04 | 2021-12-28 | 京东方科技集团股份有限公司 | Frequency tunable frequency source and related systems, methods, and electronic devices |
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| CN104579170B (en) | 2017-10-13 |
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