CN1790904A - Full-integrated highly-linear triangular-wave generator - Google Patents
Full-integrated highly-linear triangular-wave generator Download PDFInfo
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- CN1790904A CN1790904A CN 200410098930 CN200410098930A CN1790904A CN 1790904 A CN1790904 A CN 1790904A CN 200410098930 CN200410098930 CN 200410098930 CN 200410098930 A CN200410098930 A CN 200410098930A CN 1790904 A CN1790904 A CN 1790904A
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Abstract
The completely-integrated high-linear triangular-wave generator, which contains just some MOS tubes and a capacitor to avoid drift and mismatch in integrated resistance and reduce thermal noise and fit to D-type power amplifier, comprises: a forward current source to generate stable current as two times to the following negative current source and inject into a capacitor controlled by a switch tube, a negative current source to also generate stable current and extract current from said capacitor, a feedback buffer circuit, and a nonlinear Schmidt trigger to generate signal and control startup of switch tube to make injection current for capacitor vary periodically and generate high-linear triangular-wave.
Description
Technical field
The present invention relates to a kind of triangular signal generator basedly, refer in particular to a kind of high linearity that can in integrated circuit, use, low noise full-integrated highly-linear triangular-wave generator.
Background technology
In traditional triangular-wave generator, Schmidt trigger is realized by feedback loop that by operational amplifier and several resistance triangular signal then is to use integrating circuit that the signal that Schmidt trigger produces is directly carried out integration.Be subjected to the influence of non-ideal factors such as the limited gain of operational amplifier, bandwidth and the amplitude of oscillation, and the thermal noise and the technology mismatch of resistance introducing, traditional Schmidt trigger has shortcomings such as design is complicated, response speed is slow, output noise is big.The signal that Schmidt trigger is produced directly carries out the then very difficult good high-performance triangular signal of the linearity that produces of integration, and distorted signals is big.
Summary of the invention
The present invention is directed to above problem, propose a kind of operational amplifier and resistance of not using, the novel highly-linear triangular-wave generator that is suitable in integrated circuit, using.
For achieving the above object, a kind of fully integrated highly-linear triangular-wave generator provided by the invention is characterized in that: comprise four functional blocks: forward current source, negative current source, feedback buffer circuit, non-linear Schmidt trigger; Described forward current source and negative current source can both produce the stabling current that does not change with output voltage, the electric current that the forward current source produces is 2 times that negative current source produces electric current, and by its injection to electric capacity of a switch controlled, negative current source then extracts electric current from electric capacity all the time; Described Schmidt trigger produces the unlatching of Signal-controlled switch pipe, thereby makes the periodically positive and negative variation of injection current of electric capacity, produces the high linearity triangular wave signal.
Described highly-linear triangular-wave generator, wherein said negative current source by a PMOS manage, the 2nd PMOS pipe, the 3rd NMOS pipe, the 4th NMOS pipe, the 5th NMOS pipe, the 6th NMOS pipe, the 7th NMOS pipe constitute; A wherein said PMOS pipe links to each other with grid, the source electrode of the 2nd PMOS pipe and produces image current, and one in the image current flows through the 3rd NMOS pipe that diode connects, and another flows through the 6th NMOS pipe and the 4th NMOS pipe of cascade; Wherein said the 4th NMOS pipe links to each other with the grid of the 5th NMOS pipe, and links to each other with the drain electrode of the 2nd PMOS pipe; Wherein said the 3rd NMOS pipe, the 6th NMOS pipe link to each other with the grid of the 7th NMOS pipe.
Described highly-linear triangular-wave generator, wherein said forward current source and negative current source are the high amplitude of oscillation current mirroring circuits of symmetrical complement; The position of PMOS and NMOS is symmetrical in both circuit, produces rightabout electric current.
Described highly-linear triangular-wave generator, wherein said non-linear Schmidt trigger comprise three inverters and two nonlinear loads; Wherein said two reversers have different breadth length ratios, thereby have the changing voltage of different amplitudes; The NMOS pipe of described each self-driven the 3rd reverser of two reversers and PMOS pipe; Nonlinear load is made of two regenerative circuits that intersect the grid connection and form, and is driven by the 3rd reverser.
Described highly-linear triangular-wave generator, wherein said feedback buffer circuit is made of the reverser of cascade, and back level reverser is the proportional amplification of prime reverser; When this circuit guarantees the driving of back one-level circuit, less to the load of previous stage circuit; Described feedback buffer circuit is used to export the control signal of non-linear Schmidt trigger, the drive current switch pipe.
The invention has the advantages that, only form by some metal-oxide-semiconductors and an electric capacity, avoided the use of integrated resistor and operational amplifier, thereby avoided the drift and the mismatch of resistance in the integrated circuit, reduced thermal noise, avoid the distortion of the non-ideal characteristic introducing of operational amplifier simultaneously, can produce high linear triangular signal.The present invention can be used as independently signal generating circuit, also is suitable for using in integrated circuits such as D power-like amplifier.
Description of drawings
The present invention is further illustrated below in conjunction with accompanying drawing
Fig. 1 is the circuit diagram in forward current of the present invention source;
Fig. 2 is the circuit diagram of negative current source of the present invention;
Fig. 3 is the circuit diagram of the non-linear Schmidt trigger of the present invention;
Fig. 4 is whole circuit figure of the present invention.
Embodiment
Fig. 1 is the circuit diagram in forward current of the present invention source.The forward current source by a NMOS manage, the 2nd NMOS pipe, the 3rd PMOS pipe, the 4th PMOS pipe, the 5th PMOS pipe, the 6th PMOS pipe, the 7th PMOS pipe constitute.A wherein said NMOS pipe links to each other with grid, the source electrode of the 2nd NMOS pipe and produces image current.One in the image current flows through the 3rd PMOS pipe that diode connects, and another flows through the 6th PMOS pipe and the 4th PMOS pipe of cascade.Wherein said the 4th PMOS pipe links to each other with the grid of the 5th PMOS pipe, and links to each other with the drain electrode of the 2nd NMOS pipe.Wherein said the 3rd PMOS pipe, the 6th PMOS pipe link to each other with the grid of the 7th PMOS pipe.
Fig. 2 is the circuit diagram of negative current source of the present invention.Negative current source and forward current source are the high amplitude of oscillation current mirroring circuits of symmetrical complement.The position of PMOS and NMOS is symmetrical in both circuit, produces rightabout electric current.
Fig. 3 is the circuit diagram of the non-linear Schmidt trigger of the present invention.Non-linear Schmidt trigger comprises three inverters and two nonlinear loads. wherein said two reversers have the breadth length ratio of different differences, thereby have the changing voltage of different amplitudes.When the amplitude of triangular signal was passed through a certain changing voltage, the control signal of Schmidt trigger output changed, thus the range of linearity of decision triangular signal; The NMOS pipe of described each self-driven the 3rd reverser of two reversers and PMOS pipe.The PMOS pipe of wherein said the 3rd reverser is driven by the reverser of higher changing voltage in described two reversers, and the NMOS pipe is driven by the reverser of low changing voltage in described two reversers; Nonlinear load is made of two regenerative circuits that intersect the grid connection and form, and is driven by the 3rd reverser, and promptly PMOS and the NMOS that is connected by two intersection grid constitutes, thereby forms the positive feedback nonlinear circuit, produces control signal.
Fig. 4 is whole circuit figure of the present invention.By four functional blocks: forward current source 1, negative current source 2, non-linear Schmidt trigger 3, feedback buffer circuit 4 are formed.The ruuning situation of highly-linear triangular-wave generator of the present invention is when current switch pipe Msw is closed, the forward current source is to the electric capacity injection current, negative current source extracts electric current from electric capacity simultaneously, because the former electric current is 2 times of the latter, and the ramp signal that electric capacity output is risen.When signal amplitude surpassed the positive threshold value of Schmidt trigger, the output signal of trigger changed, and makes switching tube open, and cut off the injection current of forward current source to electric capacity, the ramp signal that electric capacity output at this moment descends.When signal amplitude surpasses the negative threshold value of Schmidt trigger, the output signal of trigger changes, and makes the switching tube closure, and the forward current source begins the injection current to electric capacity, at this moment electric capacity is exported the ramp signal of rising again, finishes the cycle of a triangular signal.
Claims (5)
1, a kind of fully integrated highly-linear triangular-wave generator is characterized in that: comprise four functional blocks: forward current source, negative current source, feedback buffer circuit, non-linear Schmidt trigger;
Described forward current source and negative current source can both produce the stabling current that does not change with output voltage, the electric current that the forward current source produces is 2 times that negative current source produces electric current, and by its injection to electric capacity of a switch controlled, negative current source then extracts electric current from electric capacity all the time;
Described Schmidt trigger produces the unlatching of Signal-controlled switch pipe, thereby makes the periodically positive and negative variation of injection current of electric capacity, produces the high linearity triangular wave signal.
2, according to the described fully integrated highly-linear triangular-wave generator of claim 1, it is characterized in that: described negative current source by a PMOS manage, the 2nd PMOS pipe, the 3rd NMOS pipe, the 4th NMOS pipe, the 5th NMOS pipe, the 6th NMOS pipe, the 7th NMOS pipe constitute;
A wherein said PMOS pipe links to each other with grid, the source electrode of the 2nd PMOS pipe and produces image current, and one in the image current flows through the 3rd NMOS pipe that diode connects, and another flows through the 6th NMOS pipe and the 4th NMOS pipe of cascade;
Wherein said the 4th NMOS pipe links to each other with the grid of the 5th NMOS pipe, and links to each other with the drain electrode of the 2nd PMOS pipe;
Wherein said the 3rd NMOS pipe, the 6th NMOS pipe link to each other with the grid of the 7th NMOS pipe.
3, according to the described fully integrated highly-linear triangular-wave generator of claim 1, it is characterized in that: wherein said forward current source and negative current source are the high amplitude of oscillation current mirroring circuits of symmetrical complement; The position of PMOS and NMOS is symmetrical in both circuit, produces rightabout electric current.
4, according to the described fully integrated highly-linear triangular-wave generator of claim 1, it is characterized in that: wherein said non-linear Schmidt trigger comprises three inverters and two nonlinear loads; Wherein said two reversers have different breadth length ratios, thereby have the changing voltage of different amplitudes; The NMOS pipe of described each self-driven the 3rd reverser of two reversers and PMOS pipe; Nonlinear load is made of two regenerative circuits that intersect the grid connection and form, and is driven by the 3rd reverser.
5, according to the described fully integrated highly-linear triangular-wave generator of claim 1, it is characterized in that: wherein said feedback buffer circuit is made of the reverser of cascade, and back level reverser is the proportional amplification of prime reverser; When this circuit guarantees the driving of back one-level circuit, less to the load of previous stage circuit; Described feedback buffer circuit is used to export the control signal of non-linear Schmidt trigger, the drive current switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410098930 CN1790904A (en) | 2004-12-16 | 2004-12-16 | Full-integrated highly-linear triangular-wave generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410098930 CN1790904A (en) | 2004-12-16 | 2004-12-16 | Full-integrated highly-linear triangular-wave generator |
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| CN1790904A true CN1790904A (en) | 2006-06-21 |
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| CN 200410098930 Pending CN1790904A (en) | 2004-12-16 | 2004-12-16 | Full-integrated highly-linear triangular-wave generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404487B (en) * | 2008-06-05 | 2010-12-15 | 美芯晟科技（北京）有限公司 | Triangular wave generation method and its circuit |
| TWI551048B (en) * | 2015-07-31 | 2016-09-21 | 國立雲林科技大學 | Linear triangular wave generator with stray effect compensation and associated method for compensating stray effect |
| CN106330136A (en) * | 2015-06-19 | 2017-01-11 | 中芯国际集成电路制造(上海)有限公司 | Schmitt trigger |
| CN106911323A (en) * | 2015-12-23 | 2017-06-30 | 联芯科技有限公司 | Triangular-wave generator and triangular wave generation system |
-
2004
- 2004-12-16 CN CN 200410098930 patent/CN1790904A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101404487B (en) * | 2008-06-05 | 2010-12-15 | 美芯晟科技（北京）有限公司 | Triangular wave generation method and its circuit |
| CN106330136A (en) * | 2015-06-19 | 2017-01-11 | 中芯国际集成电路制造(上海)有限公司 | Schmitt trigger |
| CN106330136B (en) * | 2015-06-19 | 2019-01-22 | 中芯国际集成电路制造(上海)有限公司 | Schmidt trigger |
| TWI551048B (en) * | 2015-07-31 | 2016-09-21 | 國立雲林科技大學 | Linear triangular wave generator with stray effect compensation and associated method for compensating stray effect |
| CN106911323A (en) * | 2015-12-23 | 2017-06-30 | 联芯科技有限公司 | Triangular-wave generator and triangular wave generation system |
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