CN203492007U - High-precision ring oscillator and frequency calibration circuit thereof - Google Patents
High-precision ring oscillator and frequency calibration circuit thereof Download PDFInfo
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- CN203492007U CN203492007U CN201320560066.7U CN201320560066U CN203492007U CN 203492007 U CN203492007 U CN 203492007U CN 201320560066 U CN201320560066 U CN 201320560066U CN 203492007 U CN203492007 U CN 203492007U
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The utility model discloses a high-precision ring oscillator and a frequency calibration circuit thereof. The high-precision ring oscillator comprises a band gap reference circuit, a reference current circuit, a current regulating circuit, a ring oscillation circuit and an output buffer circuit. The frequency calibration circuit comprises a frequency divider, a counter, a comparator, a register and a non-volatile memory. The frequency calibration circuit quickly positions necessary regulating current of the high-precision ring oscillator and sets and stores the regulation in the non-volatile memory. The high-precision ring oscillator and the frequency calibration circuit disclosed by the utility model cooperate to compensate the effect of temperature, voltage and process variation on the oscillation efficiency so as to ensure high precision of the oscillation efficiency. The high-precision ring oscillator and the frequency calibration circuit cooperate to obtain the high-precision oscillation efficiency, meanwhile, avoiding a complicated circuit, reducing the area and power consumption of a chip, simulating the nonlinearity, error and noise of a comparing circuit, improving the frequency precision and saving the testing time and cost of the chip.
Description
Technical field
The utility model relates to a kind of high accuracy ring oscillator and frequency calibration circuit thereof.
Background technology
The need of work clock of digital circuit.As essential in communication requirement etc. becomes high-precision clock to the demand of precise time.For many years, with phase-locked loop circuit with produce high precision clock with reference to external crystal-controlled oscillation and permitted multicircuit standard configuration.Yet phase-locked loop circuit area and power consumption are larger.Meanwhile, the reference external crystal-controlled oscillation on circuit board has increased the cost of Circuits System.For saving cost and the power consumption of Circuits System, high accuracy ring oscillator is the research direction of numerous circuit designer for many years always.
Yet the basic principle of ring oscillator is that the inverter of connecting by odd number produces oscillator signal.The time delay of inverter is subject to supply voltage, and the impact of temperature and process deviation is very large, and the frequency that causes ring oscillator has very large deviation with the drift of chip technology, supply voltage and temperature.
In order to overcome the frequency of ring oscillator, with the drift of chip technology, supply voltage and temperature, drift about.For many years, the frequency that numerous circuit designer alleviate ring oscillator by a lot of methods is drifted about with the drift of chip technology, supply voltage and temperature.Yet, these methods as patent " built-in oscillating circuit " application number 201210592614.4 are all the ring oscillator circuits that adopt as shown in Figure 1, this ring oscillator circuit comprises reference current circuit 101, current comparator 102, annular oscillation circuit 103 and the frequency current conversion circuit 104 that circuit connects, utilization by the frequency inverted of annular oscillation circuit for voltage/current signals after with the comparison of reference voltage/reference current, then by result relatively, control the frequency of ring oscillator.Yet voltage to frequency/frequency-current conversion circuit and voltage comparator/current comparator needs extra area and power consumption.The more important thing is, voltage to frequency/frequency-current conversion circuit and voltage comparator/current comparator are all analog circuits, thereby non-linear, the error of itself and noise all can exert an influence and affect final frequency accuracy circuit.
Utility model content
The utility model provides a kind of high accuracy ring oscillator and frequency calibration circuit thereof, by coordinating of high accuracy ring oscillator and frequency calibration circuit, obtain high-precision frequency of oscillation, avoided complicated circuit simultaneously, area and the power consumption of chip have been reduced, non-linear, the error of analog comparator and noise, improved frequency accuracy, saved testing time and the cost of chip.
In order to achieve the above object, the utility model provides a kind of high accuracy ring oscillator, this high accuracy ring oscillator comprises band-gap reference circuit, connect the reference current circuit of this band-gap reference circuit, connect this reference current circuit current regulating circuit, connect this current regulating circuit annular oscillation circuit, connect the output buffer of this annular oscillation circuit;
Band-gap reference circuit is for generation of the accurate voltage V that not affected by temperature and supply voltage
b, the accurate voltage V that reference current circuit is used band-gap reference circuit to produce
bproducing size is the accurate electric current of I, the accurate electric current that current regulating circuit produces with reference current circuit also produces and regulates electric current to export to annular oscillation circuit according to the adjustment setting from frequency calibration circuit, to regulate the frequency of annular oscillation circuit, output buffer comprises the inverter string that difference turns single-end circuit and increases step by step, difference turns single-end circuit the difference output of annular oscillation circuit is converted to Single-end output, the Single-end output that the inverter string increasing step by step turns single-end circuit by difference further amplifies the clock signal that raising driving force is exported whole high accuracy ring oscillator output.
Described reference current circuit comprises operational amplifier, MOS transistor MP and accurate resistance R, the accurate voltage V that the anti-phase input terminal strip gap reference circuit of operational amplifier produces
bthe output of operational amplifier connects the grid of MOS transistor MP, the in-phase input end of the source electrode concatenation operation amplifier of MOS transistor MP and precisely one end of resistance R, the other end ground connection of accurate resistance R, the accurate electric current output that it is I that the drain electrode of MOS transistor MP provides size.
Described current regulating circuit comprises the PMOS transistor MP1 that circuit connects, and current source circuit and adjusting current control circuit; Described current source circuit comprises N the PMOS transistor MP3 that circuit connects, MP5 ..., MP (2N+1), described adjusting current control circuit comprises N the PMOS transistor MP2 that circuit connects, MP4 ..., MP (2N);
One end ground connection of the accurate electric current I 1 that the size of current that reference current circuit produces is I, grid and the drain electrode of another termination the one PMOS transistor MP1, the source electrode of the one PMOS transistor MP1 meets power vd D, the grid of the one PMOS transistor MP1 also connects respectively N PMOS transistor MP3 in current source circuit, MP5, the grid of MP (2N+1), for N PMOS transistor MP3, MP5, MP (2N+1) provide reference voltage, N PMOS transistor MP3, MP5, the source electrode of MP (2N+1) all connects power vd D, N PMOS transistor MP3, MP5, the drain electrode of MP (2N+1) is connected respectively N the PMOS transistor MP2 regulating in current control circuit, MP4, the source electrode of MP (2N), , the source electrode of PMOS transistor MP2 connects the drain electrode of PMOS transistor MP3, the source electrode of PMOS transistor MP4 connects the drain electrode of PMOS transistor MP5, the source electrode of PMOS transistor MP (2N) connects the drain electrode of PMOS transistor MP (2N+1), N PMOS transistor MP2, MP4, the grid of MP (2N) connects respectively N control signal K1, K2, KN, this N control signal K1, K2, KN is from frequency calibration circuit, N PMOS transistor MP2, MP4, the drain electrode of MP (2N) links together provides adjusting electric current, N in current source circuit PMOS transistor MP3, MP5, the size of MP (2N+1) is all identical with a PMOS transistor MP1, MP3 in current source circuit, MP5, MP (2N+1) is total to N transistor as N current source, the electric current that the same size that all can provide provides with a PMOS transistor MP1 is I, regulate N PMOS transistor MP2 in current control circuit, MP4, MP (2N) controls for N current source in corresponding current source circuit provides conducting, along with N control signal K1, K2, the linearity of the current source number of the conducting that KN controls increases, the adjusting electric current of output is linear increasing also.
N is 2 index, that is, and and N=2
m; N and m are by regulating size and the desired precision of electric current to determine: establish N=1, the size that regulates electric current during m=0 is I, now have or not and regulate electric current is whether K switch 1 conducting of current regulating circuit is X% on the impact of annular oscillation circuit frequency, if be Y% to the required precision of high accuracy ring oscillator output frequency, if X≤Y, N=1, m=0, the size of the current source that current regulating circuit K1 controls is I; If X>Y, the value of N and m is by 2
m-1<X/Y≤2
m, N=2
mdetermine, now by N control signal K1, K2 ..., the size of current of the current source that KN controls is I/N.
The utility model also provides a kind of current regulating circuit for high accuracy ring oscillator, and this current regulating circuit comprises the PMOS transistor MP1 that circuit connects, and current source circuit and adjusting current control circuit; Described current source circuit comprises N the PMOS transistor MP3 that circuit connects, MP5 ..., MP (2N+1), described adjusting current control circuit comprises N the PMOS transistor MP2 that circuit connects, MP4 ..., MP (2N);
One end ground connection of the accurate electric current I 1 that the size of current that reference current circuit produces is I, grid and the drain electrode of another termination the one PMOS transistor MP1, the source electrode of the one PMOS transistor MP1 meets power vd D, the grid of the one PMOS transistor MP1 also connects respectively N PMOS transistor MP3 in current source circuit, MP5, the grid of MP (2N+1), for N PMOS transistor MP3, MP5, MP (2N+1) provide reference voltage, N PMOS transistor MP3, MP5, the source electrode of MP (2N+1) all connects power vd D, N PMOS transistor MP3, MP5, the drain electrode of MP (2N+1) is connected respectively N the PMOS transistor MP2 regulating in current control circuit, MP4, the source electrode of MP (2N), , the source electrode of PMOS transistor MP2 connects the drain electrode of PMOS transistor MP3, the source electrode of PMOS transistor MP4 connects the drain electrode of PMOS transistor MP5, the source electrode of PMOS transistor MP (2N) connects the drain electrode of PMOS transistor MP (2N+1), N PMOS transistor MP2, MP4, the grid of MP (2N) connects respectively N control signal K1, K2, KN, this N control signal K1, K2, KN is from frequency calibration circuit, N PMOS transistor MP2, MP4, the drain electrode of MP (2N) links together provides adjusting electric current, N in current source circuit PMOS transistor MP3, MP5, the size of MP (2N+1) is all identical with a PMOS transistor MP1, MP3 in current source circuit, MP5, MP (2N+1) is total to N transistor as N current source, the electric current that the same size that all can provide provides with a PMOS transistor MP1 is I, regulate N PMOS transistor MP2 in current control circuit, MP4, MP (2N) controls for N current source in corresponding current source circuit provides conducting, along with N control signal K1, K2, the linearity of the current source number of the conducting that KN controls increases, the adjusting electric current of output is linear increasing also.
N is 2 index, that is, and and N=2
m; N and m are by regulating size and the desired precision of electric current to determine: establish N=1, the size that regulates electric current during m=0 is I, now have or not and regulate electric current is whether K switch 1 conducting of current regulating circuit is X% on the impact of annular oscillation circuit frequency, if be Y% to the required precision of high accuracy ring oscillator output frequency, if X≤Y, N=1, m=0, the size of the current source that current regulating circuit K1 controls is I; If X>Y, the value of N and m is by 2
m-1<X/Y≤2
m, N=2
mdetermine, now by N control signal K1, K2 ..., the size of current of the current source that KN controls is I/N.
The utility model also provides a kind of frequency calibration circuit for high accuracy ring oscillator, and this frequency calibration circuit comprises frequency divider, connection external crystal-controlled oscillation and the counter of frequency divider, the comparator of linkage counter, the register that is connected comparator and high accuracy ring oscillator and the nonvolatile memory that is connected register that connects high accuracy ring oscillator.
The utility model coordinates by high accuracy ring oscillator and frequency calibration circuit, and this high accuracy ring oscillator can compensation temperature, and voltage and process deviation reach the high accuracy of frequency of oscillation on the impact of frequency of oscillation.The current regulating circuit of this high accuracy ring oscillator is relatively simple, thereby has avoided complicated regulating circuit to save area and the power consumption of chip.In addition, the current regulating circuit of high accuracy ring oscillator is linear circuit, frequency calibration circuit is digital circuit, comparison and feedback circuit are realized in digital circuit, area and the power consumption of chip have been reduced, non-linear, error and the noise of having avoided analog comparator, improved frequency accuracy.This high accuracy ring oscillator is by noise and error with having avoided non-linear simulation circuit coordinating of frequency calibration circuit.Meanwhile, binary chop positioning mode can produce fast adjusts configuration, has saved testing time and the cost of chip.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the ring oscillator circuit in background technology;
Fig. 2 is the circuit block diagram of the high accuracy ring oscillator that provides of the utility model;
Fig. 3 is the circuit diagram of the reference current circuit of the high accuracy ring oscillator that provides of the utility model;
Fig. 4 is the circuit diagram of the current regulating circuit of the high accuracy ring oscillator that provides of the utility model;
Fig. 5 is the circuit block diagram of the frequency calibration circuit of the high accuracy ring oscillator that provides for the utility model.
Embodiment
Following according to Fig. 2～Fig. 5, illustrate preferred embodiment of the present utility model.
As shown in Figure 2, the utility model provides a kind of high accuracy ring oscillator, this oscillator comprises band-gap reference circuit 201, connect the reference current circuit 202 of this band-gap reference circuit 201, connect this reference current circuit 202 current regulating circuit 203, connect this current regulating circuit 203 annular oscillation circuit 204, connect the output buffer 205 of this annular oscillation circuit 204.
Band-gap reference circuit 201 is for generation of the accurate voltage V that not affected by temperature and supply voltage
b, the accurate voltage V that reference current circuit 202 is used band-gap reference circuit 201 to produce
bproducing size is the accurate electric current of I, the accurate electric current that current regulating circuit 203 use reference current circuits 202 produce also produces and regulates electric current to export to annular oscillation circuit 204 according to the adjustment setting from frequency calibration circuit, to regulate the frequency of annular oscillation circuit 204, output buffer 205 comprises the inverter string that difference turns single-end circuit and increases step by step, difference turns single-end circuit the difference output of annular oscillation circuit 204 is converted to Single-end output, the Single-end output that the inverter string increasing step by step turns single-end circuit by difference further amplifies the clock signal that raising driving force is exported whole high accuracy ring oscillator output.
As shown in Figure 3, described reference current circuit 202 comprises operational amplifier 2011, MOS(metal oxide semiconductor metal-oxide semiconductor (MOS)) transistor MP and accurate resistance R, the accurate voltage V that the anti-phase input terminal strip gap reference circuit 201 of operational amplifier 2011 produces
bthe output of operational amplifier 2011 connects the grid of MOS transistor MP, the in-phase input end of the source electrode concatenation operation amplifier 2011 of MOS transistor MP and precisely one end of resistance R, the other end ground connection of accurate resistance R, the accurate electric current output that it is I that the drain electrode of MOS transistor MP provides size.
As shown in Figure 4, described current regulating circuit 203 comprises the PMOS(P NMOS N-channel MOS N P-channel Metal Oxide Semiconductor that circuit connects) transistor MP1, and current source circuit and adjusting current control circuit; Described current source circuit comprises N the PMOS transistor MP3 that circuit connects, MP5 ..., MP (2N+1), described adjusting current control circuit comprises N the PMOS transistor MP2 that circuit connects, MP4 ..., MP (2N);
One end ground connection of the accurate electric current I 1 that the size of current that reference current circuit 202 produces is I, grid and the drain electrode of another termination the one PMOS transistor MP1, the source electrode of the one PMOS transistor MP1 meets power vd D, the grid of the one PMOS transistor MP1 also connects respectively N PMOS transistor MP3 in current source circuit, MP5, the grid of MP (2N+1), for N PMOS transistor MP3, MP5, MP (2N+1) provide reference voltage, N PMOS transistor MP3, MP5, the source electrode of MP (2N+1) all connects power vd D, N PMOS transistor MP3, MP5, the drain electrode of MP (2N+1) is connected respectively N the PMOS transistor MP2 regulating in current control circuit, MP4, the source electrode of MP (2N), , the source electrode of PMOS transistor MP2 connects the drain electrode of PMOS transistor MP3, the source electrode of PMOS transistor MP4 connects the drain electrode of PMOS transistor MP5, the source electrode of PMOS transistor MP (2N) connects the drain electrode of PMOS transistor MP (2N+1), N PMOS transistor MP2, MP4, the grid of MP (2N) connects respectively N control signal K1, K2, KN, this N control signal K1, K2, KN is from frequency calibration circuit, N PMOS transistor MP2, MP4, the drain electrode of MP (2N) links together provides adjusting electric current, N in current source circuit PMOS transistor MP3, MP5, the size of MP (2N+1) is all identical with a PMOS transistor MP1, MP3 in current source circuit, MP5, MP (2N+1) is total to N transistor as N current source, the electric current that the same size that all can provide provides with a PMOS transistor MP1 is I, regulate N PMOS transistor MP2 in current control circuit, MP4, MP (2N) controls for N current source in corresponding current source circuit provides conducting, along with N control signal K1, K2, the linearity of the current source number of the conducting that KN controls increases, the adjusting electric current of output is linear increasing also, for convenience of controlling, general recommendations N is 2 index, , N=2
m.N and m are by regulating size and the desired precision of electric current to determine.Be specially, if N=1, the size that regulates electric current during m=0 is I, now have or not and regulate electric current is whether K switch 1 conducting of current regulating circuit is X% on the impact of annular oscillation circuit frequency, if be Y% to the required precision of high accuracy ring oscillator output frequency, if X≤Y, N=1, m=0, the size of the current source that current regulating circuit K1 controls is I; If X>Y, the value of N and m is by 2
m-1<X/Y≤2
m, N=2
mdetermine, now by N control signal K1, K2 ..., the size of current of the current source that KN controls is I/N.
As shown in Figure 5, the utility model also provides a kind of frequency calibration circuit for high accuracy ring oscillator, this frequency calibration circuit comprise connect high accuracy ring oscillator 406 frequency divider 402, connect external crystal-controlled oscillation 401 and the counter 403 of frequency divider 402, the comparator 404 of linkage counter 403, be connected the register 405 of comparator 404 and high accuracy ring oscillator 406 and the nonvolatile memory 407 that is connected register 405.
When the chip that uses high accuracy ring oscillator dispatches from the factory test, frequency calibration circuit carries out frequency calibration to high accuracy ring oscillator, and this transmitting frequency calibration method comprises following steps:
The clock signal C K of step 1,406 outputs of high accuracy ring oscillator
oscthrough frequency divider 402, produce a clock signal C K that frequency is very low
div;
The reference clock CK that step 2, counter 403 use external crystal-controlled oscillation 401 to provide
cryto clock signal C K
divfor the time of high level counts, obtain count value CNT_E, counter 403 has desired value M, and the value of establishing frequency divider 402 is N, and the signal dutyfactor after frequency division is 50 percent, reference clock CK
cryfrequency be f
cry, the frequency of expectation high accuracy ring oscillator 406 output clocks is f
e, its pass is f
e/ N=f
cry/ 2M, therefore counter desired value M=N f
cry/ 2f
e;
Step 3,404 couples of count value CNT_E of comparator and desired value M compare, and adopt binary chop adjustment for controlling the value of register 405 of the adjusting size of current of high accuracy ring oscillator 406 according to comparative result;
When count value CNT_E is during lower than default desired value M, show the clock signal C K of high accuracy ring oscillator 406 outputs
osctoo fast, need to reduce regulate electric current, when count value CNT_E is during higher than default desired value M, show the clock signal C K of high accuracy ring oscillator 406 outputs
osccross slowly, need to increase regulate electric current;
Use binary chop adjustment to regulate the method for electric current to comprise following steps:
Step 3.1, use median N/2, N is the quantity of the current source in the current regulating circuit 203 in high accuracy ring oscillator 406, makes N/2 current source conduction, N/2 current source closed;
Step 3.2, when finding to reduce electric current, use N/4 value, only there is N/4 current source conduction further to test, when finding to increase electric current, use 3N/4 value, there is 3N/4 current source conduction further to test, by that analogy, until find the numerical value of suitable register 405;
Step 4, by the numerical value write non-volatile memory 407 of register 405;
Step 5, power on after, from nonvolatile memory 407, read to adjust and numerical value be set in register 405, control current regulating circuit 203 and annular oscillation circuit 204 in high accuracy ring oscillator 406 and produce frequency of oscillation accurately.
Described counter 403 can be realized as VHDL or Verilog code by Very High Speed Integrated Circuit (VHSIC) hardware description language.
Proportion calibration circuit carries out after frequency calibration high accuracy ring oscillator, and the deviation of supply voltage, temperature and chip technology is all overcome.When regulating the number of current source abundant, thereby the frequency of high accuracy ring oscillator output reaches by the frequency that extremely approaches expectation the high accuracy that not affected by supply voltage, temperature and chip technology.
Compare existing circuit, the frequency calibration circuit that this circuit is used is digital circuit, and comparison and feedback circuit are realized in digital circuit, has reduced area and the power consumption of chip; Non-linear, error and the noise of having avoided analog comparator, improved frequency accuracy.And digital circuit can further reduce area and power consumption with the progress of technique.Meanwhile, the desired value of counter and the frequency division value of frequency divider can pass through software change, and the external crystal-controlled oscillation that chip is used while dispatching from the factory test also can change, and this has increased the flexibility of output different frequency.External crystal-controlled oscillation is only used on the testing circuit board when chip dispatches from the factory test, the cost in the time of can not bringing system applies, and use the accurate frequency of external crystal-controlled oscillation as the frequency accuracy having improved with reference to frequency after frequency calibration test.
Although content of the present utility model has been done detailed introduction by above preferred embodiment, will be appreciated that above-mentioned description should not be considered to restriction of the present utility model.Those skilled in the art, read after foregoing, for multiple modification of the present utility model with to substitute will be all apparent.Therefore, protection range of the present utility model should be limited to the appended claims.
Claims (7)
1. a high accuracy ring oscillator, it is characterized in that, this high accuracy ring oscillator comprises band-gap reference circuit (201), connect the reference current circuit (202) of this band-gap reference circuit (201), connect this reference current circuit (202) current regulating circuit (203), connect this current regulating circuit (203) annular oscillation circuit (204), connect the output buffer (205) of this annular oscillation circuit (204);
Band-gap reference circuit (201) is for generation of the accurate voltage V that not affected by temperature and supply voltage
b, the accurate voltage V that reference current circuit (202) is used band-gap reference circuit (201) to produce
bproducing size is the accurate electric current of I, current regulating circuit (203) is used the accurate electric current that reference current circuit (202) produces also according to the adjustment setting from frequency calibration circuit, to produce and regulate electric current to export to annular oscillation circuit (204), to regulate the frequency of annular oscillation circuit (204), output buffer (205) comprises the inverter string that difference turns single-end circuit and increases step by step, difference turns single-end circuit the difference output of annular oscillation circuit (204) is converted to Single-end output, the Single-end output that the inverter string increasing step by step turns single-end circuit by difference further amplifies the clock signal that raising driving force is exported whole high accuracy ring oscillator output.
2. high accuracy ring oscillator as claimed in claim 1, it is characterized in that, described reference current circuit (202) comprises operational amplifier (2011), MOS transistor MP and accurate resistance R, the accurate voltage V that the anti-phase input terminal strip gap reference circuit (201) of operational amplifier (2011) produces
bthe output of operational amplifier (2011) connects the grid of MOS transistor MP, the in-phase input end of the source electrode concatenation operation amplifier (2011) of MOS transistor MP and precisely one end of resistance R, the other end ground connection of accurate resistance R, the accurate electric current output that it is I that the drain electrode of MOS transistor MP provides size.
3. high accuracy ring oscillator as claimed in claim 2, is characterized in that, described current regulating circuit (203) comprises the PMOS transistor MP1 that circuit connects, and current source circuit and adjusting current control circuit; Described current source circuit comprises N the PMOS transistor MP3 that circuit connects, MP5 ..., MP (2N+1), described adjusting current control circuit comprises N the PMOS transistor MP2 that circuit connects, MP4 ..., MP (2N);
One end ground connection of the accurate electric current I 1 that the size of current that reference current circuit (202) produces is I, grid and the drain electrode of another termination the one PMOS transistor MP1, the source electrode of the one PMOS transistor MP1 meets power vd D, the grid of the one PMOS transistor MP1 also connects respectively N PMOS transistor MP3 in current source circuit, MP5, the grid of MP (2N+1), for N PMOS transistor MP3, MP5, MP (2N+1) provide reference voltage, N PMOS transistor MP3, MP5, the source electrode of MP (2N+1) all connects power vd D, N PMOS transistor MP3, MP5, the drain electrode of MP (2N+1) is connected respectively N the PMOS transistor MP2 regulating in current control circuit, MP4, the source electrode of MP (2N), , the source electrode of PMOS transistor MP2 connects the drain electrode of PMOS transistor MP3, the source electrode of PMOS transistor MP4 connects the drain electrode of PMOS transistor MP5, the source electrode of PMOS transistor MP (2N) connects the drain electrode of PMOS transistor MP (2N+1), N PMOS transistor MP2, MP4, the grid of MP (2N) connects respectively N control signal K1, K2, KN, this N control signal K1, K2, KN is from frequency calibration circuit, N PMOS transistor MP2, MP4, the drain electrode of MP (2N) links together provides adjusting electric current, N in current source circuit PMOS transistor MP3, MP5, the size of MP (2N+1) is all identical with a PMOS transistor MP1, MP3 in current source circuit, MP5, MP (2N+1) is total to N transistor as N current source, the electric current that the same size that all can provide provides with a PMOS transistor MP1 is I, regulate N PMOS transistor MP2 in current control circuit, MP4, MP (2N) controls for N current source in corresponding current source circuit provides conducting, along with N control signal K1, K2, the linearity of the current source number of the conducting that KN controls increases, the adjusting electric current of output is linear increasing also.
4. high accuracy ring oscillator as claimed in claim 3, is characterized in that, the index that N is 2, that is, and N=2
m; N and m are by regulating size and the desired precision of electric current to determine: establish N=1, the size that regulates electric current during m=0 is I, now have or not and regulate electric current is whether K switch 1 conducting of current regulating circuit is X% on the impact of annular oscillation circuit frequency, if be Y% to the required precision of high accuracy ring oscillator output frequency, if X≤Y, N=1, m=0, the size of the current source that current regulating circuit K1 controls is I; If X>Y, the value of N and m is by 2
m-1<X/Y≤2
m, N=2
mdetermine, now by N control signal K1, K2 ..., the size of current of the current source that KN controls is I/N.
5. the current regulating circuit for high accuracy ring oscillator claimed in claim 2 (203), it is characterized in that, this current regulating circuit (203) comprises the PMOS transistor MP1 that circuit connects, and current source circuit and adjusting current control circuit; Described current source circuit comprises N the PMOS transistor MP3 that circuit connects, MP5 ..., MP (2N+1), described adjusting current control circuit comprises N the PMOS transistor MP2 that circuit connects, MP4 ..., MP (2N);
One end ground connection of the accurate electric current I 1 that the size of current that reference current circuit (202) produces is I, grid and the drain electrode of another termination the one PMOS transistor MP1, the source electrode of the one PMOS transistor MP1 meets power vd D, the grid of the one PMOS transistor MP1 also connects respectively N PMOS transistor MP3 in current source circuit, MP5, the grid of MP (2N+1), for N PMOS transistor MP3, MP5, MP (2N+1) provide reference voltage, N PMOS transistor MP3, MP5, the source electrode of MP (2N+1) all connects power vd D, N PMOS transistor MP3, MP5, the drain electrode of MP (2N+1) is connected respectively N the PMOS transistor MP2 regulating in current control circuit, MP4, the source electrode of MP (2N), , the source electrode of PMOS transistor MP2 connects the drain electrode of PMOS transistor MP3, the source electrode of PMOS transistor MP4 connects the drain electrode of PMOS transistor MP5, the source electrode of PMOS transistor MP (2N) connects the drain electrode of PMOS transistor MP (2N+1), N PMOS transistor MP2, MP4, the grid of MP (2N) connects respectively N control signal K1, K2, KN, this N control signal K1, K2, KN is from frequency calibration circuit, N PMOS transistor MP2, MP4, the drain electrode of MP (2N) links together provides adjusting electric current, N in current source circuit PMOS transistor MP3, MP5, the size of MP (2N+1) is all identical with a PMOS transistor MP1, MP3 in current source circuit, MP5, MP (2N+1) is total to N transistor as N current source, the electric current that the same size that all can provide provides with a PMOS transistor MP1 is I, regulate N PMOS transistor MP2 in current control circuit, MP4, MP (2N) controls for N current source in corresponding current source circuit provides conducting, along with N control signal K1, K2, the linearity of the current source number of the conducting that KN controls increases, the adjusting electric current of output is linear increasing also.
6. high accuracy ring oscillator as claimed in claim 5, is characterized in that, the index that N is 2, that is, and N=2
m; N and m are by regulating size and the desired precision of electric current to determine: establish N=1, the size that regulates electric current during m=0 is I, now have or not and regulate electric current is whether K switch 1 conducting of current regulating circuit is X% on the impact of annular oscillation circuit frequency, if be Y% to the required precision of high accuracy ring oscillator output frequency, if X≤Y, N=1, m=0, the size of the current source that current regulating circuit K1 controls is I; If X>Y, the value of N and m is by 2
m-1<X/Y≤2
m, N=2
mdetermine, now by N control signal K1, K2 ..., the size of current of the current source that KN controls is I/N.
One kind for claim 1-4 the frequency calibration circuit of the high accuracy ring oscillator described in any one, it is characterized in that, this frequency calibration circuit comprises and connects the frequency divider (402) of high accuracy ring oscillator (406), the nonvolatile memory (407) that connects external crystal-controlled oscillation (401) and the counter (403) of frequency divider (402), the comparator (404) of linkage counter (403), is connected the register (405) of comparator (404) and high accuracy ring oscillator (406) and is connected register (405).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441760A (en) * | 2013-09-10 | 2013-12-11 | 灿芯半导体(上海)有限公司 | High-precision annular oscillator, and frequency calibration circuit and method thereof |
| CN106961277A (en) * | 2017-04-18 | 2017-07-18 | 江苏信息职业技术学院 | A kind of VCO circuits of low-power high-performance |
| CN107771273A (en) * | 2015-08-06 | 2018-03-06 | 桑迪士克科技有限责任公司 | The ring oscillator for the temperature detection supplied for broadband in noise circumstance |
| CN108418557A (en) * | 2018-03-02 | 2018-08-17 | 京东方科技集团股份有限公司 | A kind of ring oscillator, temperature sensing circuit and electronic equipment |
-
2013
- 2013-09-10 CN CN201320560066.7U patent/CN203492007U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103441760A (en) * | 2013-09-10 | 2013-12-11 | 灿芯半导体(上海)有限公司 | High-precision annular oscillator, and frequency calibration circuit and method thereof |
| CN107771273A (en) * | 2015-08-06 | 2018-03-06 | 桑迪士克科技有限责任公司 | The ring oscillator for the temperature detection supplied for broadband in noise circumstance |
| CN107771273B (en) * | 2015-08-06 | 2020-07-21 | 桑迪士克科技有限责任公司 | Ring oscillator for temperature detection in broadband supply noise environments |
| CN106961277A (en) * | 2017-04-18 | 2017-07-18 | 江苏信息职业技术学院 | A kind of VCO circuits of low-power high-performance |
| CN106961277B (en) * | 2017-04-18 | 2023-04-28 | 江苏信息职业技术学院 | VCO circuit with low power and high performance |
| CN108418557A (en) * | 2018-03-02 | 2018-08-17 | 京东方科技集团股份有限公司 | A kind of ring oscillator, temperature sensing circuit and electronic equipment |
| CN108418557B (en) * | 2018-03-02 | 2022-04-12 | 京东方科技集团股份有限公司 | Annular oscillator, temperature sensing circuit and electronic equipment |
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