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Oscillator

A technology of oscillators and inverters, applied in the field of oscillators, can solve the problem of inaccurate output clock frequency of the oscillator, and achieve the effect of avoiding instability of the output clock frequency

Active Publication Date: 2014-01-22
SEMICON MFG INT (SHANGHAI) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the problem of inaccurate oscillator output clock frequency in the prior art

Method used

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  • Oscillator
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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0036] In order to solve the problem in the prior art that the output clock frequency of the oscillator changes with temperature, the present invention provides an oscillator. Specifically, refer to figure 1 , the oscillator includes: a reference current source 10 and a current control oscillation circuit 20; the reference current source 10 is used to generate a reference current I with an adjustable temperature coefficient; the current control oscillation circuit 20 is used for the reference current The first clock signal CKP and the second clock signal CKN are generated by driving. Wherein, the first clock signal CKP and the second clock signal CKN are a pair of differential signals.

[0037] The temperature curve of the reference current source in the prior art is usually fixed after the production is completed, so when it works at different temperatures, the reference current output by it will also change greatly accordingly. In the oscillator, due to the change of the r...

Embodiment approach 2

[0087] refer to Figure 8 , this embodiment and figure 1 The difference of the first embodiment shown is that the oscillator further includes a frequency adjustment circuit 30, and the frequency adjustment circuit 30 is connected to the reference current source 10 and the current control oscillation circuit 20 for adjusting the reference current source 10 The output reference current I is adjusted, and the adjusted driving current Iout is output to the current-controlled oscillation circuit 20 .

[0088] The current-controlled oscillation circuit 20 generates a first clock signal CKP and a second clock signal CKN under the control of the driving current Iout.

[0089] refer to Figure 9 , the frequency adjustment circuit may include: a current mirror 210 and a switch control circuit 220 .

[0090] In this embodiment, the current mirror 210 includes an eighth MOS transistor M8 and a ninth MOS transistor M9. The source of the eighth MOS transistor M8 is grounded t...

Embodiment approach 3

[0104] refer to Figure 10 The difference between this embodiment and Embodiment 1 is that the oscillator further includes a double-ended to single-ended circuit 40 .

[0105] The double-ended to single-ended circuit 40 is used to convert the first clock signal CKP and the second clock signal CKN output by the current-controlled oscillator circuit 20 into a third clock signal net2.

[0106] refer to Figure 11 , the double-ended to single-ended circuit 40 may include: a drive circuit 410 and a duty ratio adjustment circuit 420 .

[0107] The driving circuit 410 is used for driving and amplifying the received first clock signal CKP and the second clock signal CKN, and outputting the first driving signal net1 and the second driving signal net1b. Wherein, the phase difference between the first clock signal CKP and the second clock signal CKN is 180 degrees; the first driving signal net1 and the second driving signal net1b are both amplified into rail-to-rail (rail to ...

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Abstract

The technical solution of the invention provides an oscillator. The oscillator comprises the following components: a reference current source which is used for generating reference current with adjustable temperature coefficient, and comprises a positive temperature coefficient generating circuit, a negative temperature coefficient generating circuit and a control circuit, the positive temperature coefficient generating circuit is used for generating first current with a positive temperature coefficient, the negative temperature coefficient generating circuit is used for generating second current with a negative temperature coefficient, the control circuit is connected with the positive temperature coefficient generating circuit and the negative temperature coefficient generating circuit and is used for adding the first current and the second current for generating the reference current; and a current control oscillation circuit which is used for generating a first clock signal and a second clock signal under driving by the reference current; wherein the first clock signal and the second clock signal are differential signals. The output clock frequency of the oscillator in the technical solution of the invention is more stable and accurate.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an oscillator. Background technique [0002] In the design of card chips (such as contactless smart cards), a more accurate clock signal is required, but in the application of card chips, it is impossible to add a crystal oscillator and use a phase-locked loop (phase-locked loop, pll) to obtain A very precise clock, so using an oscillator becomes its inevitable choice. [0003] But as we all know, the output clock frequency of the oscillator will be affected by the process, power supply voltage and temperature. When the above factors change, the output clock frequency error of the oscillator will be very large. Generally, the output clock frequency error of the oscillator will vary with the process. , power supply voltage, and temperature changes reach 20%~30%, and sometimes even reach 50%, which brings great trouble to the circuit design and cannot meet the normal w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L1/02H03L7/099H03K3/017
Inventor 何洪楷刘启付曹羽欧翟大伦
Owner SEMICON MFG INT (SHANGHAI) CORP