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Low distortion triangular wave generation circuit and low distortion triangular wave generation method

A technology for generating circuits and triangular waves, which is applied to low-distortion triangular wave generating circuits to generate low-distortion triangular waves, which can solve the problems of unequal rise time and fall time and high distortion.

Pending Publication Date: 2021-09-28
RICHTEK TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] The disadvantage of the prior art triangular wave generating circuit 102 is that when the charging current is not equal to the falling current, the rising time and falling time of the triangular wave signal VTR generated by the prior art will also be unequal, thus causing the generated triangular wave signal VTR It is an asymmetrical triangular wave, which also has a high degree of distortion

Method used

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  • Low distortion triangular wave generation circuit and low distortion triangular wave generation method
  • Low distortion triangular wave generation circuit and low distortion triangular wave generation method
  • Low distortion triangular wave generation circuit and low distortion triangular wave generation method

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Embodiment Construction

[0121] The drawings in the present invention are all schematic diagrams, mainly intended to show the coupling relationship between various circuits and the relationship between various signal waveforms. As for the circuits, signal waveforms and frequencies, they are not drawn to scale.

[0122] image 3 A block diagram of an embodiment of a low-distortion triangular wave generating circuit of the present invention (triangular wave generating circuit 103 ) is shown. like image 3 As shown, in this embodiment, the triangular wave generation circuit 103 includes an integration circuit 100 and an adjustment control circuit 200 .

[0123] The integrating circuit 100 is used to receive the external frequency signal CLK_e, and during the charging period Tchg and discharging period Tdch in the switching period Tsw of the external frequency signal CLK_e, the integrating circuit 100 supplies the integrating capacitor of the integrating circuit 100 with the charging current Ichg and the...

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Abstract

A low distortion triangular wave generation circuit and a low distortion triangular wave generation method are disclosed. The low distortion triangular wave generation circuit generates a triangular wave signal by performing integration on an integration capacitor via a charging current and a discharging current during a charging period and a discharging period within a switching period of an external clock signal. A time length of the charging period is identical to a time length of the discharging period. The low distortion triangular wave generation circuit generates a common mode related signal related to a common mode characteristic of the triangular wave signal according to triangular wave signal. An adjusting signal with a gain is generated according to a difference between the common mode related signal and a predetermined DC level. The adjusting signal adjusts at least one of the charging current and the discharging current via feedback mechanism such that the triangular wave signal is a symmetrical triangular wave, and an average voltage of the triangular wave signal is equal to a target DC level.

Description

technical field [0001] The invention relates to a triangular wave generating circuit, in particular to a low-distortion triangular wave generating circuit. The invention also relates to a method of generating a low distortion triangle wave. Background technique [0002] The previous cases related to this application are: US9300281B2, US7746130B2, US8044690B2, "A Sub 1-VConstant Gm–C Switched-Capacitor Current Source, IEEE TRANSACTIONS ON CIRCUITSAND SYSTEMS—II: EXPRESS BRIEFS, VOL.54, NO.3, MARCH 2007", "A Low Area, Switched-Resistor Loop Filter Technique for Fractional-N Synthesizers Applied to a MEMS-based Programmable Oscillator, ISSCC 2010, Session13.1". [0003] Figure 1A and Figure 1B A prior art triangular wave generating circuit 101 is shown, wherein two comparators are respectively used to compare the triangular wave signal VTR with the target peak level VH and compare the triangular wave signal VTR with the target valley level VL, and according to the two compa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K4/502
CPCH03K4/502
Inventor 陈奕光萧鸣均
Owner RICHTEK TECH
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