CN103457576A - High-precision RC oscillator and remote control with built-in same - Google Patents
High-precision RC oscillator and remote control with built-in same Download PDFInfo
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Abstract
The invention discloses a high-precision RC oscillator, a remote control chip with the built-in RC oscillator, and a remote control with the remote control chip. On the basis of an existing RC oscillator, the RC oscillator further comprises a temperature coefficient compensating unit and a voltage coefficient compensating unit. The temperature coefficient compensating unit comprises a first well resistor and a second well resistor, wherein one end of the first well resistor is connected with one end of a first capacitor and the input end of a first switching element, the other end of the first well resistor is connected with the output end of a first constant-current source, one end of the second well resistor is connected with one end of a second capacitor and the input end of a second switching element, and the other end of the second well resistor is connected with the output end of a second constant-current source. The capacitors do not fully discharge electricity due to the fact that the well resistors share some of the voltage, meanwhile, a negative temperature coefficient of the frequency in the oscillator is compensated through positive temperature coefficients of the well resistors, therefore, the RC oscillator with the zero temperature coefficient is obtained, and the RC oscillator can be integrated into the remote control chip.
Description
Technical field
The present invention relates to electronic device and circuit, relate in particular to the remote controller of a kind of high accuracy RC oscillator and built-in this high accuracy RC oscillator.
Background technology
In existing remote controller, as shown in Figure 1, the infrared transmitting tube 120, oscillator 130, electrochemical capacitor 140 and the triode 150 that generally comprise remote controller chip 110 and be arranged on remote controller chip 110 outsides.Yet, in order to tackle the growing cost of raw material and human cost, in the urgent need to one or more in infrared transmitting tube 120, oscillator 130 and the electrochemical capacitor 140 that will be arranged on remote controller chip 110 outsides, save or be integrated in remote controller chip 110.
For example, for oscillator 130, if it is integrated in remote controller chip 110, need to solve oscillator 130 impact that its temperature coefficient, power supply coefficient and technological parameter drift bring in the course of the work.Fig. 2 shows the circuit diagram of the RC oscillator usually adopted in remote controller in prior art, and as shown in Figure 2, this RC oscillator comprises:
Benchmark constant-current source 211 and reference resistance 212, an end of reference resistance 212 is connected with the output of benchmark constant-current source 211, other end ground connection;
The first constant-current source 231, the first electric capacity 232 and the first switching device 233, wherein, one end of the first electric capacity 232 is connected with the output of the first constant-current source 231 respectively with the input of the first switching device 233, and the output of the other end of the first electric capacity 232 and the first switching device 233 is ground connection respectively;
The second constant-current source 241, the second electric capacity 242 and second switch device 243, wherein, one end of the second electric capacity 242 is connected with the output of the second constant-current source 241 respectively with the input of second switch device 243, and the output of the other end of the second electric capacity 242 and second switch device 243 is ground connection respectively;
Comparing unit 220 and output inverter, the input of comparing unit 220 respectively with the output of benchmark constant-current source 211, the output of the output of the first constant-current source 231 and the second constant-current source 241 connects, the output of comparing unit 220 is connected with the input of output inverter with the control end of the first switching device 233 respectively, the output of output inverter is connected with the control end of second switch device 243 and the output 260 of RC oscillator respectively, thereby comparing unit 220 compares the charging voltage of the first electric capacity 232 and the second electric capacity 242 (Va and Vb) respectively with the reference voltage (REF) of benchmark constant-current source 211 outputs, when equaling reference voltage, charging voltage generates control signal, and control signal is exported to the control end of the first switching device 233 and control signal exported to the control end of second switch device 243 by the output inverter, control the first electric capacity 232 and the second electric capacity 242 alternating discharges with generating output signal (Vc).Fig. 3 shows Va, Vb and the time dependent curve of Vc, as can be seen from Figure 3, the first electric capacity 232 and the second electric capacity 242 alternately start charging from 0V, start electric discharge when charging voltage reaches reference voltage REF, thereby alternately discharge and recharge to produce output signal Vc by the first electric capacity 232 and the second electric capacity 242.
In this process, the frequency of output signal depends on the R of resistance capacitance, C value (time constant).Yet, in the RC oscillator, the temperature coefficient of reference resistance 212 is larger, and the operating temperature range of remote controller chip 110 is-20 ℃ ~ 70 ℃ usually, if directly the RC oscillator is integrated in remote controller chip, when temperature raises, resistance R increases, and causes reference voltage REF rising, charging interval increase, Frequency downshift.In addition, in the RC oscillator, the power supply coefficient of electric capacity is larger, especially adopts the prepared electric capacity of single polysilicon process, and the operating voltage range of remote controller chip is 2.0V ~ 3.6V, in this voltage range, the capacitor C value in the RC oscillator reduces along with the decline of voltage, causes frequency to accelerate.The 3rd, the drift of the electric capacity in the RC oscillator and the technological parameter of resistance is larger, such as resistance drift ± 15%, and electric capacity drift ± 15%, frequency will drift about ± and 32%.
For electrochemical capacitor, if directly remove this electrochemical capacitor in remote controller, how need to consider to power supply (as in Fig. 1+the 3V power supply) carry out filtering, thereby make the remote controller chip steady operation.In the course of the work, the electric current of infrared transmitting tube is very large, and when the output (being the OUT pin) of remote controller chip while opening or closing, transient voltage is leapt high and the phenomenon that drags down very serious, to such an extent as to have influence on power supply, the voltage of 3V can be leapt high more than 9V within short tens nanosecond.Output voltage V out and the time dependent curve of supply voltage Vdd of remote controller chip have been shown in Fig. 4, as shown in Figure 4, the shake occurred in the moment of the output voltage opening and closing of remote controller chip, by the shake that causes supply voltage from 3V to 9V, voltage dithering so fast and significantly, can have a strong impact on the remote controller chip internal logic, cause disorder, cause work undesired.Therefore, if just simply electrochemical capacitor is removed, will directly cause the remote controller job insecurity, even can't work.
At present, in order to realize the built-in remote control chip, the normal method adopted is that the employing cost is high, the two aluminium technique replacement of the twin crystal of complex process cost is low, the simple monocrystalline list of technique aluminium technique prepares remote controller chip, and section adopts band gap (bandgap) voltage stabilizing circuit within it.Although adopt the method can solve the power supply coefficient of oscillator and the impact that the technological parameter drift brings, but the impact that temperature coefficient that can't the oscillation-damped device brings, and can not save electrochemical capacitor, thereby can't really realize entirely built-inly, the outside of remote controller chip only has infrared transmitting tube.Simultaneously, adopt the two aluminium technique of twin crystal not only to increase cost, also because of complex process, preparation condition is had higher requirement.
Summary of the invention
The technical problem to be solved in the present invention is to make oscillator can't directly be integrated into the defect in remote controller chip for the impact due to the temperature coefficient of oscillator in prior art, a kind of high accuracy RC oscillator is provided and is built-in with the remote controller of this high accuracy RC oscillator.
The technical solution adopted for the present invention to solve the technical problems is: according to an aspect of of the present present invention, provide a kind of high accuracy RC oscillator, having comprised:
Benchmark constant-current source and reference resistance, an end of described reference resistance is connected with the output of described benchmark constant-current source, other end ground connection;
The first constant-current source, the first electric capacity and the first switching device, wherein, one end of described the first electric capacity is connected with the output of described the first constant-current source respectively with the input of described the first switching device, and the output of the other end of described the first electric capacity and described the first switching device is ground connection respectively;
The second constant-current source, the second electric capacity and second switch device, wherein, one end of described the second electric capacity is connected with the output of described the second constant-current source respectively with the input of described second switch device, and the output of the other end of described the second electric capacity and described second switch device is ground connection respectively;
Comparing unit and output inverter, the input of described comparing unit respectively with the output of described benchmark constant-current source, the output of the output of described the first constant-current source and described the second constant-current source connects, the output of described comparing unit is connected with the input of described output inverter with the control end of described the first switching device respectively, the output of described output inverter is connected with the output of described RC oscillator with the control end of described second switch device respectively, thereby described comparing unit compares the charging voltage of described the first electric capacity and the second electric capacity respectively with the reference voltage of described benchmark constant-current source output, with based on the described control signal that relatively generates, and described control signal is exported to the control end of described the first switching device and described control signal exported to the control end of described second switch device by described output inverter, control described the first electric capacity and described the second electric capacity alternating discharge with generating output signal,
Wherein, described RC oscillator further comprises the tc compensation unit, and described tc compensation unit comprises the first trap resistance and the second trap resistance; Wherein,
One end of described the first trap resistance is connected with the input of the first switching device with an end of described the first electric capacity respectively, and the other end of described the first trap resistance is connected with the output of described the first constant-current source;
One end of described the second trap resistance is connected with the input of second switch device with an end of described the second electric capacity respectively, and the other end of described the second trap resistance is connected with the output of described the second constant-current source.
In the high accuracy RC of foundation embodiment of the present invention oscillator, described RC oscillator further comprises adjustable delay unit, and described adjustable delay unit comprises the first inverter and the second inverter; Wherein,
The input of described the first inverter is connected with the output of described comparator, the output of described the first inverter is connected with the input of described the second inverter, and the output of described the second inverter is connected with the input of described output inverter with the control end of described the first switching device respectively;
Described the first inverter is the adjustable inverter of breadth length ratio.
In the high accuracy RC of foundation embodiment of the present invention oscillator, described RC oscillator further comprises and trims unit, and the described unit that trims comprises and trims resistance; Wherein, a described end that trims resistance is connected with the output of described benchmark constant-current source, and the other end is connected with an end of described reference resistance.
In the high accuracy RC of foundation embodiment of the present invention oscillator, the described resistance that trims is fuse resistor.
In the high accuracy RC of foundation embodiment of the present invention oscillator, the described unit that trims further comprises the first adjustable constant-flow source and the second adjustable constant-flow source; Wherein, the output in described the first adjustable constant-flow source is connected with the output of described the first constant-current source, and the output in described the second adjustable constant-flow source is connected with the output of described the second constant-current source.
In the high accuracy RC of foundation embodiment of the present invention oscillator,
Described the first switching device is the N-channel MOS pipe, and the grid of described N-channel MOS pipe, drain electrode and source electrode are respectively control end, input and the output of described the first switching device;
Described second switch device is the N-channel MOS pipe, and the grid of described N-channel MOS pipe, drain electrode and source electrode are respectively control end, input and the output of described second switch device.
According to another aspect of the present invention, a kind of remote controller that uses above-described high accuracy RC oscillator also is provided, it comprises remote controller chip and infrared transmitting tube; Wherein
The output of described remote controller chip is connected with the negative pole of described infrared transmitting tube in order to provide output signal to using as driving the signal of telecommunication to described infrared transmitting tube, and described infrared transmitting tube is based on described driving signal of telecommunication emission infrared remote-controlled signal;
Described RC oscillator is integrated in described remote controller chip.
In the remote controller of the foundation embodiment of the present invention, described remote controller chip comprises driver element, the input of described driver element receives the described output signal of described remote controller chip, the output of described driver element is connected with the output of described remote controller chip, in order to described output signal converted to the described driving signal of telecommunication and to export the output of described remote controller chip to; Wherein,
Described driver element comprises driving inverter and driven MOS pipe; Wherein, the input of driving inverter receives the output signal of described remote controller chip, and output is connected with the grid of described driven MOS pipe; The drain electrode of described driven MOS pipe is connected with the output of described remote controller chip, source ground;
The breadth length ratio of described driving inverter is set, with the opening and closing time of the output that extends described remote controller chip.
In the remote controller of the foundation embodiment of the present invention, when adopting monocrystalline list aluminium technique to prepare described remote controller chip, the breadth length ratio of described driving inverter is less than described standard breadth length ratio.
In the remote controller of the foundation embodiment of the present invention, when adopting aluminum gate process to prepare described remote controller chip, the breadth length ratio of described driving inverter is 0.5～5 times of described standard breadth length ratio.
The beneficial effect that the present invention produces is: when capacitor discharge, the dividing potential drop effect of the first and second set trap resistance makes respectively the first electric capacity and the second electric capacity all discharge not exclusively, so the starting point of charging is no longer also 0.And the resistance of trap resistance is larger, the incomplete degree of discharging is higher, and the starting point of charging is just higher, and the charging interval is just shorter.In addition, trap resistance has larger positive temperature coefficient, and its resistance increases along with the rising of temperature, and thus, the trap positive temperature coefficient of resistance has become the negative temperature coefficient in charging interval.When temperature raises, the resistance of trap resistance increases, and the charging starting point raises, and the charging interval just shortens.Yet in the RC oscillator, original reference resistance also has positive temperature coefficient, its resistance increases along with the rising of temperature, and the increase of resistance makes reference voltage REF raise, and the charging interval is elongated.Therefore the first and second trap resistance that the arrange impact that energy standard of compensation positive temperature coefficient of resistance brings just.The trap positive temperature coefficient of resistance is far longer than original positive temperature coefficient of resistance in the RC oscillator simultaneously, therefore only needs the trap resistance that resistance is very little just can compensate original positive temperature coefficient of resistance.By suitably regulating the resistance of trap resistance, just can obtain the RC oscillator of zero-temperature coefficient.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the structural representation of remote controller in prior art;
Fig. 2 is the circuit diagram of RC oscillator in prior art;
Fig. 3 is the output voltage curve over time of the charging voltage of the first electric capacity and the second electric capacity in Fig. 2 and RC oscillator;
Fig. 4 is output voltage V out and the time dependent curve of supply voltage Vdd of remote controller chip in Fig. 1;
Fig. 5 shows the circuit diagram according to the RC oscillator of first embodiment of the invention;
Fig. 6 is the output voltage curve over time of the charging voltage of the first electric capacity and the second electric capacity in Fig. 5 and RC oscillator;
Fig. 7 is the frequency variation with temperature curve of the output voltage in Fig. 6;
Fig. 8 shows the circuit diagram according to the RC oscillator of second embodiment of the invention;
Fig. 9 is the change curve of the frequency of the output voltage of RC oscillator in Fig. 8 with supply voltage;
Figure 10 shows the circuit diagram according to the RC oscillator of third embodiment of the invention;
Figure 11 be the output voltage of RC oscillator in Figure 10 frequency with trim the position change curve;
Figure 12 is the schematic diagram according to the driver element of the embodiment of the present invention;
Figure 13 is output voltage V out and the time dependent curve of supply voltage Vdd that has adopted remote controller chip after the driver element in Figure 12;
Figure 14 shows the structural representation according to the remote controller of the preferred embodiment of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Fig. 5 shows the circuit diagram according to the RC oscillator of first embodiment of the invention, and as shown in Figure 5, this RC oscillator comprises:
Benchmark constant-current source 211 and reference resistance 212, an end of reference resistance 212 is connected with the output of benchmark constant-current source 211, other end ground connection;
The first constant-current source 231, the first electric capacity 232, the first switching device 233 and the first trap resistance 510, wherein, one end of the first electric capacity 232 is connected with an end of the first trap resistance 510 respectively with the input of the first switching device 233, the output of the other end of the first electric capacity 232 and the first switching device 233 is ground connection respectively, and the other end of the first trap resistance 510 is connected with the output of the first constant-current source 231;
The second constant-current source 241, the second electric capacity 242, second switch device 243 and the second trap resistance 520, wherein, one end of the second electric capacity 242 is connected with an end of the second trap resistance 520 respectively with the input of second switch device 243, the output of the other end of the second electric capacity 242 and second switch device 243 is ground connection respectively, and the other end of the second trap resistance 520 is connected with the output of the second constant-current source 241;
Comparing unit 220 and output inverter, the input of comparing unit 220 respectively with the output of benchmark constant-current source 211, the output of the output of the first constant-current source 231 and the second constant-current source 241 connects, the output of comparing unit 220 is connected with the input of output inverter with the control end of the first switching device 233 respectively, the output of output inverter is connected with the output of RC oscillator with the control end of second switch device 243 respectively, thereby comparing unit 220 compares the charging voltage of the first electric capacity 232 and the second electric capacity 242 (V1 and V2) respectively with the reference voltage (REF) of benchmark constant-current source 211 outputs, when equaling reference voltage, charging voltage generates control signal, and control signal is exported to the control end of the first switching device 233 and control signal exported to the control end of second switch device 243 by the output inverter, control the first electric capacity 232 and the second electric capacity 242 alternating discharges with generating output signal (V3).In this RC oscillator, the first trap resistance 510 and the second trap resistance 520 have formed the tc compensation unit.
Fig. 6 shows according to the charging voltage V1 of first electric capacity 232 of the RC oscillator with tc compensation unit of the embodiment of the present invention and the second electric capacity 242 and output voltage V 3 time history plots of V2 and this RC oscillator.Comparison diagram 2 can be found out, although discharge after the first electric capacity 232 in Fig. 6 and the second electric capacity 242 still alternately are charged to reference voltage REF, but it no longer starts charging from 0V, no longer at 0V, finish electric discharge, but, since a less positive voltage charging, the positive voltage place less at this finishes electric discharge.
This is that the dividing potential drop effect of trap resistance makes the first electric capacity 232 and the second electric capacity 242 all discharge not exclusively due to when the capacitor discharge, so the starting point of charging is no longer also 0.And the resistance of trap resistance is larger, the incomplete degree of discharging is higher, and the starting point of charging is just higher, and the charging interval is just shorter.Well-known, trap resistance has larger positive temperature coefficient, and its resistance increases along with the rising of temperature, and thus, the trap positive temperature coefficient of resistance has become the negative temperature coefficient in charging interval.When temperature raises, the resistance of trap resistance increases, and the charging starting point raises, and the charging interval just shortens.Yet original resistance in the RC oscillator (being reference resistance 212) also has positive temperature coefficient, its resistance increases along with the rising of temperature, and the increase of resistance makes reference voltage (REF) raise, and the charging interval is elongated.Therefore the first and second trap resistance that arrange can compensate the impact that original positive temperature coefficient of resistance brings just.And the trap positive temperature coefficient of resistance is far longer than original positive temperature coefficient of resistance in the RC oscillator, therefore only need the trap resistance that resistance is very little just can compensate original positive temperature coefficient of resistance.By suitably regulating the resistance of trap resistance, just can obtain the RC oscillator of zero-temperature coefficient.Fig. 7 is the frequency variation with temperature curve of output voltage V 3 in Fig. 6, and as can be seen from Figure 7, in the temperature range of-20 ℃～70 ℃, its frequency values remains unchanged substantially, has realized the zero-temperature coefficient of RC oscillator.
Fig. 8 shows the circuit diagram according to the RC oscillator of second embodiment of the invention, as shown in Figure 8, further comprise adjustable delay unit on the basis of the oscillator that this oscillator is shown in Figure 5, adjustable delay unit comprises the first inverter 810 and the second inverter 820.Wherein, the input of the first inverter 810 is connected with the output of comparator, the output of the first inverter 810 is connected with the input of the second inverter 820, and the output of the second inverter 820 is connected with the input of output inverter with the control end of the first switching device 233 respectively; The first inverter 810 is the adjustable inverter of breadth length ratio.
In the RC oscillator, electric capacity (the RC oscillator especially prepared by monocrystalline list aluminium technique), its power supply coefficient is larger, and the capacitance that shows as electric capacity sharply descends along with the decline of supply voltage.In the course of the work, along with the decline of capacitance, the charging interval of electric capacity (the first electric capacity 232 and the second electric capacity 242) shortens, and makes the charging interval of oscillator show positive power supply coefficient, and the output frequency of oscillator shows negative power supply coefficient.In the change curve of the output frequency of the RC oscillator shown in Fig. 9 and supply voltage, the curve 901 of the power supply coefficient that this is negative shows as output frequency to be reduced along with the increase of supply voltage.Usually reduce the device time delay in order to obtain better circuit performance in the art as far as possible, yet, in contrast, this is in the RC oscillator adjustable delay unit with delay function further is set, because the output frequency of adjustable delay unit itself has positive power supply coefficient, along with the reduction of supply voltage, time delay increases gradually, correspondingly the charging interval lengthens, and output frequency reduces.If the breadth length ratio that concrete structure and parameter is suitably regulated the first inverter 810 in adjustable delay unit according to the RC oscillator, the power supply coefficient that can make the charging interval is 0.The power supply coefficient curve 902 of the positive output frequency of adjustable delay unit has been shown in Fig. 9 and by adjustable delay unit, compensate after the power supply coefficient of RC oscillator output be 0 offset supply coefficient curve 903 substantially.
Because the breadth length ratio of the first inverter 810 in adjustable delay unit can be regulated as the case may be, therefore, when the consistency of power supply coefficient of electric capacity own is poor, can be adjusted, be calibrated according to the test data of each IC.Through flow repeatedly, experiment showed, the power supply coefficient is controlled at ± 0.5% in, while needing, increase adjustable extent and can obtain zero power supply coefficient.
The skew of the RC oscillator output frequency caused for the technological parameter drift of eliminating resistance and electric capacity, further comprise and trim unit according to the RC oscillator of third embodiment of the invention, as shown in figure 10, trims unit and comprise and trim resistance 1010; Wherein, an end that trims resistance 1010 is connected with the output of benchmark constant-current source 211, and the other end is connected with an end of reference resistance 212, trims resistance 1010 and is preferably fuse resistor, by the gating of fuse, determines resistance.Simultaneously, in order to increase adjustable extent, trim unit and further comprise the first adjustable constant-flow source 1020 and the second adjustable constant-flow source 1030; Wherein, the output in the first adjustable constant-flow source 1020 is connected with the output of the first constant-current source 231, and the output in the second adjustable constant-flow source 1030 is connected with the output of the second constant-current source 241.
Now the adjustable accuracy of RC oscillator and adjustable extent depend on and trim position, Figure 11 shows the output frequency of RC oscillator with the change curve that trims position, if trim position, be i.e. 27 powers of the 7fH(shown in Figure 11), in experiment, process deviation can be controlled at ± 0.25% in, simultaneously adjustable extent is up to ± 32%.While needing, increase trims figure place and can obtain odd-job skill deviation.
In addition, in any one above-mentioned RC oscillator, the first switching device 233 is the N-channel MOS pipe, and the grid of N-channel MOS pipe, drain electrode and source electrode are respectively control end, input and the output of the first switching device 233; Second switch device 243 is the N-channel MOS pipe, and the grid of N-channel MOS pipe, drain electrode and source electrode are respectively control end, input and the output of second switch device 243.Certainly, also above-mentioned various switching devices can be replaced with to other field-effect transistors such as junction field effect transistor, bipolar transistor herein, also can replace with triode etc., repeat no longer one by one herein.
Remote controller according to the embodiment of the present invention comprises remote controller chip and infrared transmitting tube.Wherein the output of remote controller chip is connected with the negative pole of infrared transmitting tube in order to provide output signal to using as driving the signal of telecommunication to infrared transmitting tube, and infrared transmitting tube is based on driving signal of telecommunication emission infrared remote-controlled signal; The above-mentioned oscillator of the RC according to each embodiment of the present invention is integrated in remote controller chip.In above-mentioned RC oscillator, the temperature coefficient of resistance has obtained effective improvement on the technological parameter of the impact of output frequency and resistance and electric capacity to one or more in the impact of output frequency on the power supply coefficient of the impact of the output frequency of RC oscillator, electric capacity, can not reduce the service behaviour of remote controller in therefore in the RC oscillator is integrated into to remote controller chip.
Usually the output pin (OUT pin) that adopts electrochemical capacitor to eliminate remote controller in remote controller opens and closes the significantly voltage dithering (as shown in Figure 4) of moment supply voltage generation.This moment significantly voltage dithering will have a strong impact on the internal logic of remote controller chip, cause disorder, cause its cisco unity malfunction.Even therefore adopt the two aluminium technique of twin crystal to prepare remote controller chip, can not save above-mentioned electrochemical capacitor.
In order further thoroughly to save electrochemical capacitor in this remote controller, remote controller chip according to the embodiment of the present invention further comprises driver element, as shown in figure 12, the input of driver element receives the output signal of remote controller chip, the output of driver element is connected with the output of remote controller chip, in order to output signal is converted to the output (OUT pin) that drives the signal of telecommunication and export remote controller chip to.Driver element comprises driving inverter 1201 and driven MOS pipe 1202; Wherein, drive the output signal of the input reception remote controller chip of inverter 1201, output is connected with the grid of driven MOS pipe 1202; The drain electrode of driven MOS pipe 1202 is connected with the output of remote controller chip, source ground; The breadth length ratio of described driving inverter is set, with the opening and closing time of the output that extends described remote controller chip.
Those of ordinary skill in the art knows, and for opening and closing time of the output pin of control chip reaches the shortest, the fan-in the fan leaves coefficient of device need to be matched.For example, if drive the device of a large-size (breadth length ratio), for example, in order to drive large-sized driven MOS pipe 1202, need so to strengthen the size of device, need to strengthen the size that drives inverter 1201, so just can guarantee has enough large driving force, thereby obtains desirable square wave.The breadth length ratio that drives inverter 1201 in prior art is 8 times of standard breadth length ratio normally, or even 64 times, by the increase of breadth length ratio, could ensure driving force, thereby obtain desirable square wave.
Yet in the present invention, if adopt monocrystalline list aluminium technique to prepare remote controller chip, arrange and drive the breadth length ratio of inverter 1201 to be less than the standard breadth length ratio, preferably, the breadth length ratio that 1 driving inverter 1201 can be set is 0.01 times of standard breadth length ratio.If adopt the more aluminum gate process of low side to prepare remote controller chip, because the driving force of the device prepared under this technique own very a little less than, and that the size of driven MOS pipe 1202 likely can arrive greatly is standard-sized more than 10,000 times, 0.5～5 times that therefore the breadth length ratio that drives inverter 1201 now is set is the standard breadth length ratio gets final product.In practical application, according to concrete preparation technology and concrete chip type, select to drive the suitable breadth length ratio of inverter 1201, get final product so long as can extend the opening and closing time of the output of described remote controller chip.
Take under monocrystalline list aluminium technique, driving 0.01 times that the breadth length ratio of inverter 1201 is the standard breadth length ratio is example, drive the size of inverter to reduce compared to prior art for example 800 times or 6400 times herein, as shown in figure 13, result is that the voltage Vout of the driving signal of telecommunication exported of the output pin of remote controller is no longer the square wave of standard, but trapezoidal wave, it is mild that voltage jump becomes.Due to output pin output trapezoidal wave, so the time elongation of output pin (OUT pin) opening and closing, Vout is moment increasing and minimizing no longer, but slowly strengthens, slowly reduces.Because the output end voltage Vout of remote controller chip is become to becoming in sine wave by square wave, therefore the significantly jitter phenomenon shown in Fig. 4 no longer appears in supply voltage Vdd, thus, the internal logic of remote controller chip is fully unaffected, and the signal that also can not affect receiver receives.Meanwhile, also greatly dwindled device size.It is for example that herein 0.01 times is only used, and is not limitation of the present invention, also can select other multiple in actual applications, for example 0.02 times, 0.05 times etc., will not enumerate herein.The selection of multiple has directly determined the wave form varies of Vout, in above-mentioned example, with 0.02 times, with 0.05 times, compares, and selects the waveform of Vout after 0.01 times more to level off to sine wave.
In addition, in the remote controller according to the embodiment of the present invention, by the size that increases output pin (OUT pin), arrive enough greatly, just can save the triode shown in Fig. 1.Figure 14 shows the structural representation according to the remote controller of the preferred embodiment of the present invention, triode and electrochemical capacitor have wherein been saved, oscillator is integrated to be built in remote controller chip, realize full built-in remote control chip so fully, thereby met the current requirement for low cost, high-performance and high integration.Preferably, can adopt monocrystalline list aluminium technique to prepare remote controller chip, further reduce costs.
As can be seen from the above, in the RC of foundation embodiment of the present invention oscillator, by the tc compensation unit comprise the first trap resistance and the second trap resistance is set in the RC oscillator, the output frequency effectively caused by the positive temperature coefficient of reference resistance in the oscillation-damped device slack-off.By the adjustable delay unit comprise the first inverter and the second inverter is set in the RC oscillator, can effectively eliminates the output frequency that the positive supply coefficient by electric capacity causes and accelerate.Comprise and trim trimming unit and can eliminating the output frequency drift that the technological parameter drift by resistance and electric capacity causes of resistance by arranging in the RC oscillator.Therefore above-mentioned various RC oscillators can be integrated in remote controller chip, improve the integrated level of remote controller chip, thereby reduce costs when guaranteeing device performance.
In the remote controller of the foundation embodiment of the present invention, integrated above-mentioned RC oscillator in remote controller chip, improved the integrated level of remote controller, reduced the size of remote controller.By reducing the breadth length ratio that drives inverter in remote controller chip, can effectively eliminate output pin and open and close the supply voltage that moment causes and significantly shake, thereby can also directly save electrochemical capacitor in this remote controller.Above-mentioned remote controller chip can adopt the preparation of monocrystalline list aluminium technique, has further reduced cost and preparation difficulty.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
Claims (10)
1. a high accuracy RC oscillator, is characterized in that, comprising:
Benchmark constant-current source and reference resistance, an end of described reference resistance is connected with the output of described benchmark constant-current source, other end ground connection;
The first constant-current source, the first electric capacity and the first switching device, wherein, one end of described the first electric capacity is connected with the output of described the first constant-current source respectively with the input of described the first switching device, and the output of the other end of described the first electric capacity and described the first switching device is ground connection respectively;
The second constant-current source, the second electric capacity and second switch device, wherein, one end of described the second electric capacity is connected with the output of described the second constant-current source respectively with the input of described second switch device, and the output of the other end of described the second electric capacity and described second switch device is ground connection respectively;
Comparing unit and output inverter, the input of described comparing unit respectively with the output of described benchmark constant-current source, the output of the output of described the first constant-current source and described the second constant-current source connects, the output of described comparing unit is connected with the input of described output inverter with the control end of described the first switching device respectively, the output of described output inverter is connected with the output of described RC oscillator with the control end of described second switch device respectively, thereby described comparing unit compares the charging voltage of described the first electric capacity and the second electric capacity respectively with the reference voltage of described benchmark constant-current source output, with based on the described control signal that relatively generates, and described control signal is exported to the control end of described the first switching device and described control signal exported to the control end of described second switch device by described output inverter, control described the first electric capacity and described the second electric capacity alternating discharge with generating output signal,
Described RC oscillator further comprises the tc compensation unit, and described tc compensation unit comprises the first trap resistance and the second trap resistance; Wherein,
One end of described the first trap resistance is connected with the input of the first switching device with an end of described the first electric capacity respectively, and the other end of described the first trap resistance is connected with the output of described the first constant-current source;
One end of described the second trap resistance is connected with the input of second switch device with an end of described the second electric capacity respectively, and the other end of described the second trap resistance is connected with the output of described the second constant-current source.
2. high accuracy RC oscillator according to claim 1, is characterized in that, described RC oscillator further comprises adjustable delay unit, and described adjustable delay unit comprises the first inverter and the second inverter; Wherein,
The input of described the first inverter is connected with the output of described comparator, the output of described the first inverter is connected with the input of described the second inverter, and the output of described the second inverter is connected with the input of described output inverter with the control end of described the first switching device respectively;
Described the first inverter is the adjustable inverter of breadth length ratio.
3. high accuracy RC oscillator according to claim 1, is characterized in that, described RC oscillator further comprises and trim unit, and the described unit that trims comprises and trims resistance; Wherein, a described end that trims resistance is connected with the output of described benchmark constant-current source, and the other end is connected with an end of described reference resistance.
4. high accuracy RC oscillator according to claim 3, is characterized in that, the described resistance that trims is fuse resistor.
5. high accuracy RC oscillator according to claim 3, is characterized in that, the described unit that trims further comprises the first adjustable constant-flow source and the second adjustable constant-flow source; Wherein, the output in described the first adjustable constant-flow source is connected with the output of described the first constant-current source, and the output in described the second adjustable constant-flow source is connected with the output of described the second constant-current source.
6. according to the described high accuracy RC oscillator of claim 1-5 any one, it is characterized in that,
Described the first switching device is the N-channel MOS pipe, and the grid of described N-channel MOS pipe, drain electrode and source electrode are respectively control end, input and the output of described the first switching device;
Described second switch device is the N-channel MOS pipe, and the grid of described N-channel MOS pipe, drain electrode and source electrode are respectively control end, input and the output of described second switch device.
7. the remote controller of the described high accuracy RC oscillator of right to use requirement 1-6 any one, is characterized in that, comprises remote controller chip and infrared transmitting tube; Wherein
The output of described remote controller chip is connected with the negative pole of described infrared transmitting tube in order to provide output signal to using as driving the signal of telecommunication to described infrared transmitting tube, and described infrared transmitting tube is based on described driving signal of telecommunication emission infrared remote-controlled signal;
Described RC oscillator is integrated in described remote controller chip.
8. remote controller according to claim 7, it is characterized in that, described remote controller chip comprises driver element, the input of described driver element receives the described output signal of described remote controller chip, the output of described driver element is connected with the output of described remote controller chip, in order to described output signal converted to the described driving signal of telecommunication and to export the output of described remote controller chip to; Wherein,
Described driver element comprises driving inverter and driven MOS pipe; Wherein, the input of driving inverter receives the output signal of described remote controller chip, and output is connected with the grid of described driven MOS pipe; The drain electrode of described driven MOS pipe is connected with the output of described remote controller chip, source ground;
Described driving inverter has to extend the breadth length ratio of opening and closing time of the output of described remote controller chip.
9. remote controller according to claim 8, is characterized in that, when adopting monocrystalline list aluminium technique to prepare described remote controller chip, the breadth length ratio of described driving inverter is less than described standard breadth length ratio.
10. remote controller according to claim 8, is characterized in that, when adopting aluminum gate process to prepare described remote controller chip, the breadth length ratio of described driving inverter is 0.5～5 times of described standard breadth length ratio.
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