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Oscillator circuit

An oscillation circuit and circuit technology, applied in the direction of electric pulse generator circuit, etc., can solve problems such as inability to maintain a constant value, increase in gate capacitance, and oscillation frequency error

Inactive Publication Date: 2016-05-18
SII SEMICONDUCTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the oxide film thickness tox varies depending on the manufacturing conditions, when only the transistor area is increased, the threshold voltage difference ΔVTH decreases, but cannot be maintained at a constant value.
In addition, due to the large transistor area, the gate capacitance of the MOS transistor is larger than that of the capacitance for generating the triangular wave voltage. As a result, it may become a factor causing an error in the oscillation frequency.

Method used

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Examples

Experimental program
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Effect test

no. 1 approach ＞

[0026] figure 1 It is a circuit diagram showing the CR oscillation circuit of the first embodiment.

[0027] The CR oscillation circuit of the first embodiment has constant current sources 20, 21, capacitor 40, reference voltage circuits 30, 31, voltage comparator 50, inverters 60, 61, 62, NAND circuit 70, and switches 10, 11, 12 , 13, 14, 15. The reference voltage circuit 30 outputs a reference voltage VH. The reference voltage circuit 31 outputs a reference voltage VL. The reference voltage has a relationship of reference voltage VH>reference voltage VL.

[0028] The connection of the CR oscillation circuit of the first embodiment will be described.

[0029] Between the power supply terminal and the ground terminal, a constant current source 20 , a switch 10 , a switch 11 and a constant current source 21 are connected in series. Let the connection point of the switch 10 and the switch 11 be a node SLOPE. The reference voltage circuit 30 is connected to the node VREF v...

no. 2 approach ＞

[0070] Figure 4 It is a circuit diagram of the CR oscillation circuit of the second embodiment. and figure 1 The difference is that the constant current source 22, DFF90, EXOR80 and switch 16 are added. The constant current source 22 flows through the current I of the constant current source 20 CHG large current I BOOST .

[0071] Regarding the connection of the CR oscillation circuit of the second embodiment, only the points of change from the CR oscillation circuit of the first embodiment will be described.

[0072] The D terminal and the RX terminal of DFF90 are connected to the EN terminal, and the C terminal is connected to the node OSCOUT. One input terminal of EXOR80 is connected to EN terminal, and the other input terminal is connected to Q terminal of DFF90. The constant current source 22 and the switch 16 connected in series are provided between the power supply terminal and the node SLOPE. The selection terminal of the switch 16 is connected to the output t...

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PUM

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Abstract

Provided is a CR oscillator circuit that achieves a small occupied area and good oscillation frequency accuracy while having small current consumption. The CR oscillator circuit includes: a reference voltage circuit configured to switch and output a reference voltage; a first constant current source configured to charge a capacitor; a second constant current source configured to discharge the capacitor; a voltage comparator configured to compare voltages of the reference voltage circuit and the capacitor; and a logic circuit. The logic circuit is configured to switch between the reference voltage circuit and the constant current source simultaneously in response to an output signal of the voltage comparator.

Description

technical field [0001] The present invention relates to a current-controlled CR oscillation circuit, and more specifically, to a CR oscillation circuit with low current consumption and a small occupied area. Background technique [0002] As an oscillation circuit used in electronic equipment, a crystal oscillation circuit combining a semiconductor integrated circuit and a crystal resonator has been used conventionally. When there is a parasitic capacitance near a semiconductor integrated circuit or a crystal resonator, the oscillation frequency of the crystal oscillator circuit may deviate from the set value. [0003] However, in recent years, the high-density packaging of electronic components has increased due to the demand for miniaturization of electronic equipment, so the parasitic capacitance in the vicinity of semiconductor integrated circuits or crystal resonators tends to increase. Therefore, a CR oscillation circuit has been known conventionally as an oscillation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/02
Inventor 佐野稔
Owner SII SEMICONDUCTOR CORP