CN101072011A - Crystal oscillator fast start circuit - Google Patents
Crystal oscillator fast start circuit Download PDFInfo
- Publication number
- CN101072011A CN101072011A CN 200610040278 CN200610040278A CN101072011A CN 101072011 A CN101072011 A CN 101072011A CN 200610040278 CN200610040278 CN 200610040278 CN 200610040278 A CN200610040278 A CN 200610040278A CN 101072011 A CN101072011 A CN 101072011A
- Authority
- CN
- China
- Prior art keywords
- circuit
- crystal oscillator
- connects
- amplifying circuit
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
Main characters of the circuit are that an assistant amplifying circuit (AAC) for oscillation of crystal is added based on current start circuit for oscillation of crystal. In time of starting oscillation of crystal, the original amplifying circuit (OAC) for oscillation of crystal works with AAC together. Under actions of two circuits at same time, amplitude of oscillation of crystal can be magnified in acceleration. After amplitude of oscillation of crystal reaches to prearranged value, the invention turns off AAC, and OAC for oscillation of crystal works right along. Since magnification of OAC is lower, amplitude of oscillation of crystal can be stabilized quickly. The invention reduces time for staring up oscillation of crystal greatly.
Description
Technical field:
The invention belongs to circuit field, relate to analog integrated circuit, specifically crystal oscillator fast start circuit.
Background technology:
Crystal oscillating circuit provides the clock of entire chip usually, have only produce metastable clock after, circuit just can carry out synchronous initiation.Some circuit is very short to the time requirement from system's energized to synchronous initiation, and this just requires crystal oscillating circuit to start fast.
Usually the crystal oscillating circuit that adopts is that a crystal oscillator adds a drive circuit at present, crystal oscillator provides 180 degree phasic differences, drive circuit provides 180 degree phasic differences, sort circuit has the slow shortcoming of toggle speed, for those circuit very short to the time requirement from system's energized to synchronous initiation, this crystal oscillating circuit also is not suitable for using.
Summary of the invention:
Purpose of the present invention is exactly to be at the slow problem of present crystal oscillator drive circuit toggle speed, and proposes a kind of crystal oscillator fast start circuit that can obviously improve circuit start speed.
Purpose of the present invention can be achieved through the following technical solutions:
A kind of crystal oscillator fast start circuit, its composition includes, the crystal oscillator amplifying circuit, comparator circuit, register circuit, Nverter circuit, switching circuit, during forming, it also includes the auxiliary amplifying circuit of crystal oscillator, the signal input part of crystal oscillator amplifying circuit connects the crystal oscillator signal, the signal input part of the auxiliary amplifying circuit of crystal oscillator links to each other with the signal input part of crystal oscillator amplifying circuit by described switching circuit, the signal output part of crystal oscillator amplifying circuit links to each other with the signal output part of the auxiliary amplifying circuit of crystal oscillator, this signal output part connects a signal input part of comparator circuit, another signal input part of comparator circuit connects standard signal source, the input end of clock of the output termination register circuit of comparator circuit, the data input pin of register circuit connects supply voltage, the register circuit output links to each other with the input of inverter circuit, the output of inverter then links to each other with switching circuit control end in the above-mentioned crystal oscillator signal path, the register circuit output also links to each other with the control end of earthed switch circuit, and this earthed switch circuit is serially connected with between earth terminal and the auxilliary amplifying circuit signal input part of crystal oscillator.
The auxiliary amplifying circuit of crystal oscillator in the crystal oscillator fast start circuit is the n transistor npn npn, and the grid of n transistor npn npn connects signal input part, source ground, and drain electrode connects signal output part.
The key of technical solution of the present invention is exactly the auxiliary amplifying circuit of an additional crystal oscillator in existing crystal oscillator drive circuit.When crystal oscillator began, former amplifying circuit and auxiliary amplifying circuit worked together, and under the effect, the amplitude of crystal oscillator can be quickened to amplify in two circuit.After the amplitude of crystal oscillator has reached the size of being scheduled to, turn off auxiliary amplifying circuit automatically, only stay former amplifying circuit to work on.Because the multiplication factor of former amplifying circuit is lower, the amplitude of crystal oscillator tends towards stability very soon, can reduce the start-up time of crystal oscillator so greatly.
Advantage of the present invention is: reduce the start-up time of crystal oscillator effectively, can obviously improve circuit start speed, also be applicable to the circuit very short to the time requirement from system's energized to synchronous initiation simultaneously.
Advantage of the present invention and characteristics will illustrate by the non-limitative illustration of following preferred embodiment and explain that these embodiment only provide as an example with reference to accompanying drawing.
Description of drawings:
Fig. 1 is the functional block diagram of crystal oscillator fast start circuit embodiment of the present invention;
Fig. 2 is the circuit diagram of crystal oscillator main amplifying circuit in the embodiment of the invention;
Fig. 3 is the circuit diagram of the auxiliary amplifying circuit of crystal oscillator in the embodiment of the invention;
Fig. 4 is the circuit diagram of comparator circuit in the embodiment of the invention;
Fig. 5 is the circuit diagram of register circuit in the embodiment of the invention;
Fig. 6 is the circuit diagram of inverter circuit in the embodiment of the invention;
Fig. 7 is the circuit diagram of switching circuit in the embodiment of the invention;
Fig. 8 is the circuit diagram of NAND gate circuit in the embodiment of the invention.
Embodiment
Embodiment one
Fig. 1 is the functional block diagram of crystal oscillator fast start circuit embodiment of the present invention.The signal input part of crystal oscillator amplifying circuit connects the crystal oscillator signal, the signal input part of the auxiliary amplifying circuit of crystal oscillator links to each other by the signal input part of switching circuit with the crystal oscillator amplifying circuit, the signal output part of crystal oscillator amplifying circuit links to each other with the signal output part of the auxiliary amplifying circuit of crystal oscillator, this signal output part connects a signal input part of comparator circuit, another signal input part of comparator circuit connects standard signal source, the input end of clock of the output termination register circuit of comparator circuit, the data input pin of register circuit connects supply voltage, the register circuit output links to each other with the input of inverter circuit, the output of inverter then links to each other with switching circuit control end in the above-mentioned crystal oscillator signal path, the register circuit output also links to each other with the control end of earthed switch circuit, and this earthed switch circuit is serially connected with between earth terminal and the auxilliary amplifying circuit signal input part of crystal oscillator.Behind power connection, the amplitude of crystal oscillator is very little, signal path switching circuit 600 is in on-state, the crystal oscillator signal enters crystal oscillator main amplifying circuit 100 and the auxiliary amplifying circuit 200 of crystal oscillator simultaneously, the auxiliary amplifying circuit 200 of crystal oscillator main amplifying circuit 100 and crystal oscillator works together, because two amplifying circuits are worked simultaneously, the amplitude of crystal oscillator can be quickened to be exaggerated.The amplitude of crystal oscillator constantly compares in comparator circuit 300 with a predetermined in advance magnitude of voltage, and when the amplitude of crystal oscillator equaled pre-threshold voltage, comparator circuit 300 output OUTC will overturn, i.e. the output of comparator becomes 1 by 0.This saltus step drives a register 400 and locks, make the output of register 400 change to 1 by 0, the high level one tunnel of register output is anti-phase through inverter circuit 500, shutdown signal channel selector circuit 600, disconnect the path between the auxiliary input amplifier of crystal oscillator signal and crystal oscillator, earthed switch circuit 700 is connected on another road of high level of register output, the signal input part of the auxiliary amplifying circuit of crystal oscillator is linked to each other with earth terminal VSS, like this, the auxiliary amplifying circuit 200 of crystal oscillator is closed, and has only crystal oscillator main amplifying circuit 100 this moment in work.For the amplitude that makes crystal oscillator can tend towards stability at last, the multiplication factor of crystal oscillator main amplifying circuit is generally lower, and therefore under its effect, the amplitude of crystal oscillator tends towards stability very soon, and such amplifying circuit can reduce the start-up time of crystal oscillator greatly.
Fig. 2 is the crystal oscillator amplifying circuit, and the source electrode of p transistor npn npn P meets power vd D, and grid connects input, and drain electrode connects output; The source electrode of n transistor npn npn N1 connects output, and grid connects power supply, and drain electrode connects input; The grid of n transistor npn npn N2 connects input, source ground, and drain electrode connects output.The size of P and N2 is respectively 20u/8u and 48u/lu among the figure, and N1 is of a size of 0.25u/18u
Fig. 3 is the auxiliary amplifying circuit of crystal oscillator, and the grid of n transistor npn npn connects input among the figure, and drain electrode connects output, source ground.The transistorized 100u/0.18u that is of a size of.
Fig. 4 is a comparator circuit, p transistor npn npn P1 among the figure, P2, the source electrode of P3 connects power supply, the grid of p transistor npn npn P1 and P2 links to each other with the drain electrode of n transistor npn npn N3, the drain electrode of p transistor npn npn P1 links to each other with the drain electrode of n transistor npn npn N3, the drain electrode of p transistor npn npn P2 links to each other with the drain electrode of n transistor npn npn N4, the grid of p transistor npn npn P3 links to each other with the grid of n transistor npn npn N5, the drain electrode of p transistor npn npn P3 is connected with the drain electrode of n transistor npn npn N5, the grid of n transistor npn npn N5 links to each other with the drain electrode of n transistor npn npn N4, the source electrode of n transistor npn npn N4 links to each other with the source electrode of n transistor npn npn N3, be connected to the drain electrode of n transistor npn npn N7, the source ground of n transistor npn npn N7, n transistor npn npn N7 grid link to each other the source ground of n transistor npn npn N6 with the grid of n transistor npn npn N6.Among the figure, the size of N6 and N7 is 20u/1u, and the size of N3 and N4 is 1u/1u, and the size of P1 and P2 is 20u/1u, and N5 is of a size of 0.5u/0.18u, and P3 is of a size of 40u/0.18u.
Fig. 5 is a register circuit, power supply connects NAND gate 1 by switch 1, switch 2 is connected on the NAND gate 1, inverter 3 is connected on the switch 2, inverter 3 and the switch 2 middle switches 3 that are connected to, NAND gate 2 is connected on the switch 3, and link to each other with inverter 4, inverter 4 connects inverter 5, and inverter 5 meets output OUTR, inverter 1 is connected on the switch 1, it is middle with inverter 1 that switch 3 is connected on switch 1, and switch 4 is connected between switch 1 and the NAND gate 1, inverter 2 one termination switches 4, the other end is connected between NAND gate 1 and the switch 2, and output OUTC connects inverter 1, switch 2 and switch 4.
Fig. 6 is an inverter circuit, and the source electrode of p transistor npn npn connects power supply, and grid connects input, and drain electrode connects output, and the grid of n transistor npn npn connects input, source ground, and drain electrode connects output.The transistorized 40u/0.18u that is of a size of of P, the transistorized 0.5u/0.18u that is of a size of of N.
Fig. 7 is a switching circuit, and the p transistor npn npn links to each other with source electrode with the source electrode of n transistor npn npn, and connects output, and drain electrode links to each other with drain electrode, and connects input, and grid links to each other with grid, and the grid of p transistor npn npn connects inverter.The transistorized 10u/0.18u that is of a size of of P, the transistorized 10u/0.18u that is of a size of of N.
Fig. 8 right and wrong gate circuit, the source electrode of n transistor npn npn N9 links to each other with the drain electrode of n transistor npn npn N8, the source ground of n transistor npn npn N8, the grid of the source electrode of n transistor npn npn N9 and n transistor npn npn N8 all connects input, the source electrode of p transistor npn npn P4, P5 connects power supply, and drain electrode connects output, and grid connects input.The size of P4 and P5 is 0.5u/0.18u, and the size of N8 and N9 is 40u/0.18u.
In the above accompanying drawing, VDD is a power supply; VSS is ground.IO among Fig. 4 is the external impressed current source.
Above-mentionedly respectively scheme described circuit and get up promptly to form the electrical schematic diagram of a complete crystal oscillator fast start circuit by Fig. 1 structure.
The present invention also has other execution mode, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops in protection scope of the present invention.
Claims (2)
1, a kind of crystal oscillator fast start circuit, its composition includes, the crystal oscillator amplifying circuit, comparator circuit, register circuit, Nverter circuit, switching circuit, it is characterized in that: also include the auxiliary amplifying circuit of crystal oscillator during it is formed, the signal input part of crystal oscillator amplifying circuit connects the crystal oscillator signal, the signal input part of the auxiliary amplifying circuit of described crystal oscillator links to each other with the signal input part of crystal oscillator amplifying circuit by described switching circuit, the signal output part of crystal oscillator amplifying circuit links to each other with the signal output part of the auxiliary amplifying circuit of crystal oscillator, this signal output part connects a signal input part of comparator circuit, another signal input part of described comparator circuit connects standard signal source, the input end of clock of the output termination register circuit of described comparator circuit, the data input pin of register circuit connects supply voltage, the register circuit output links to each other with the input of inverter circuit, the output of described inverter then links to each other with switching circuit control end in the above-mentioned crystal oscillator signal path, described register circuit output also links to each other with the control end of earthed switch circuit, and this earthed switch circuit is serially connected with between earth terminal and the auxiliary amplifying circuit signal input part of crystal oscillator.
2, crystal oscillator fast start circuit according to claim 1 is characterized in that: the auxiliary amplifying circuit of described crystal oscillator is the n transistor npn npn, and the grid of described n transistor npn npn connects signal input part, source ground, and drain electrode connects signal output part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100402787A CN100533948C (en) | 2006-05-12 | 2006-05-12 | Crystal oscillator fast start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100402787A CN100533948C (en) | 2006-05-12 | 2006-05-12 | Crystal oscillator fast start circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101072011A true CN101072011A (en) | 2007-11-14 |
| CN100533948C CN100533948C (en) | 2009-08-26 |
Family
ID=38899038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100402787A Expired - Fee Related CN100533948C (en) | 2006-05-12 | 2006-05-12 | Crystal oscillator fast start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100533948C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103051220A (en) * | 2013-01-25 | 2013-04-17 | 杭州士兰微电子股份有限公司 | Switching power supply and controller thereof |
| CN103138678A (en) * | 2011-11-25 | 2013-06-05 | 上海华虹Nec电子有限公司 | Device capable of rapidly starting on-chip oscillator |
| CN103825552A (en) * | 2012-11-19 | 2014-05-28 | 苏州工业园区新宏博通讯科技有限公司 | Crystal-oscillator circuit shared by multiple chips |
| CN105577140A (en) * | 2015-12-14 | 2016-05-11 | 上海华虹宏力半导体制造有限公司 | Crystal oscillator drive circuit |
-
2006
- 2006-05-12 CN CNB2006100402787A patent/CN100533948C/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103138678A (en) * | 2011-11-25 | 2013-06-05 | 上海华虹Nec电子有限公司 | Device capable of rapidly starting on-chip oscillator |
| CN103138678B (en) * | 2011-11-25 | 2016-08-17 | 上海华虹宏力半导体制造有限公司 | The device of agitator in rapidly starting on-chip |
| CN103825552A (en) * | 2012-11-19 | 2014-05-28 | 苏州工业园区新宏博通讯科技有限公司 | Crystal-oscillator circuit shared by multiple chips |
| CN103051220A (en) * | 2013-01-25 | 2013-04-17 | 杭州士兰微电子股份有限公司 | Switching power supply and controller thereof |
| CN103051220B (en) * | 2013-01-25 | 2015-07-29 | 杭州士兰微电子股份有限公司 | Switching Power Supply and controller thereof |
| CN105577140A (en) * | 2015-12-14 | 2016-05-11 | 上海华虹宏力半导体制造有限公司 | Crystal oscillator drive circuit |
| CN105577140B (en) * | 2015-12-14 | 2018-02-06 | 上海华虹宏力半导体制造有限公司 | Crystal oscillator drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100533948C (en) | 2009-08-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7167017B2 (en) | Isolation cell used as an interface from a circuit portion operable in a power-down mode to a circuit portion in a power-up mode | |
| KR101387266B1 (en) | Level shift device | |
| US8593013B2 (en) | Switching control method capable of continuously providing power and related apparatus and power supply system | |
| KR20040014160A (en) | Master slave flip-flop circuit functioning as edge trigger flip-flop | |
| CN101573869B (en) | Voltage switching circuit | |
| US6750680B2 (en) | Semiconductor integrated circuit, logic operation circuit, and flip flop | |
| CN100533948C (en) | Crystal oscillator fast start circuit | |
| US7432754B2 (en) | Voltage control circuit having a power switch | |
| KR970060217A (en) | Output circuit, circuit for reducing leakage current, method for selectively switching transistor and semiconductor memory | |
| US20020047733A1 (en) | Transistor circuit | |
| CN110868201B (en) | Low-power consumption quick response level conversion circuit | |
| JP2004128590A (en) | Level shifter circuit | |
| US8341446B2 (en) | Control module for controlling electro-phoretic display integrated circuit and method thereof | |
| US20150028941A1 (en) | Controlled power switch chain sequencing for both power up and power down of a power domain | |
| CN214756293U (en) | Level conversion circuit applied to SOC | |
| JP2000059200A (en) | Semiconductor device and driving method for semiconductor device | |
| KR102577748B1 (en) | Power control curcuit and semiconductor apparatus using the power control circuit | |
| CN101267203B (en) | Simulation buffer with voltage compensation mechanism | |
| US7313713B2 (en) | Sequential/combinational logic transistor segregation for standby power and performance optimization | |
| KR20010004448A (en) | An Invertor for outputting a high voltage | |
| CN101222224B (en) | Level shift circuit with voltage pulling and its voltage lifting circuit | |
| US5844441A (en) | High votage latch using CMOS transistors and method therefor | |
| CN111506150B (en) | Input circuit | |
| CN215646340U (en) | Power-off protection circuit and electronic equipment | |
| CN106249453B (en) | Low-power source electrode driving circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090826 |