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Oscillation circuit and method of controlling same

A technology of oscillating circuits and circuits, applied in power oscillators, electrical components, generating electric pulses, etc., can solve problems such as inability to form oscillating circuits, and achieve the effects of shortening start-up time and suppressing current consumption

Inactive Publication Date: 2010-05-26
NEC ELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the oscillation circuit described in Patent Document 2 detects a rise in the power supply voltage and generates a trigger, it cannot constitute an oscillation circuit that operates in standby mode.

Method used

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  • Oscillation circuit and method of controlling same
  • Oscillation circuit and method of controlling same
  • Oscillation circuit and method of controlling same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] figure 2 It is a circuit diagram of an oscillation circuit according to the first embodiment of the present invention. exist figure 2 Among them, the oscillation circuit includes a CMOS structure inverter circuit INV, a crystal oscillator Xtal, a resistance element R1, capacitance elements C1 and C2, NMOS transistors Q1 and Q3, a PMOS transistor Q2, and a CMOS structure control circuit 14a.

[0036]The inverter circuit INV functions as an amplifier, and one end of the capacitive element C1, the drain of the NMOS transistor Q1, one end of the crystal oscillator Xtal, and one end of the resistive element R1 are connected to the input end. Furthermore, one end of the capacitive element C2, the drain of the NMOS transistor Q3, the other end of the crystal oscillator Xtal, and one end of the PMOS transistor Q2 are connected to the output end. The other end of the PMOS transistor Q2 is connected to the other end of the resistance element R1. The other end of the capaciti...

Embodiment 2

[0047] Figure 4 It is a circuit diagram of an oscillation circuit according to a second embodiment of the present invention. exist Figure 4 in, with figure 2 The same reference numerals denote the same components, and descriptions thereof are omitted. The oscillating circuit of the second embodiment with figure 2 In contrast, the NMOS transistor Q1 and the PMOS transistor Q2 are removed, and a 2-input NAND circuit NAND is provided instead of the inverter circuit INV. In addition, the control circuit 14b has a terminal S1B, and the output from the terminal S1B to one input terminal of the NAND circuit NAND and the slave figure 2 Inverted signal of the signal output by terminal S1. One end of the resistance element R1, one end of the capacitance element C1, and one end of the crystal oscillator Xtal are connected to the other input end of the NAND circuit NAND. Furthermore, one end of the capacitive element C2, the other end of the crystal oscillator Xtal, the other e...

Embodiment 3

[0056] Figure 6 It is a circuit diagram of an oscillation circuit according to a third embodiment of the present invention. exist Figure 6 in, with figure 2 The same reference numerals denote the same components, and descriptions thereof are omitted. The oscillating circuit of the 3rd embodiment with figure 1 In contrast, the NMOS transistor Q1 and the PMOS transistor Q2 are removed, and a 2-input NOR circuit NOR is provided instead of the inverter circuit INV. The terminal S1 is connected to one input end of the NOR circuit NOR. One end of the resistance element R1, one end of the capacitance element C1, and one end of the crystal oscillator Xtal are connected to the other input end of the NOR circuit NOR. Furthermore, one end of the capacitive element C2, the other end of the crystal oscillator Xtal, the other end of the resistive element R1, and the drain of the NMOS transistor Q3 are connected to the output end of the NOR circuit NOR.

[0057] Next, the operation ...

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PUM

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Abstract

Disclosed is an oscillator in which current consumption relating to oscillation is reduced. The oscillator comprises: an amplifier to an input and output of which a piezoelectric oscillator and a feedback resistor are connected in parallel, and which is constituted by a CMOS logic inverter circuit; and a control circuit, which is constituted by a CMOS logic circuit, for clamping input / output levels of the amplifier and halting oscillation before oscillation start-up, unclamping the input / output levels at beginning of oscillation start-up and supplying a pulse signal to an output terminal of the amplifier a prescribed period of time after the beginning of oscillation start-up.

Description

technical field [0001] The invention relates to an oscillating circuit and a control method thereof, in particular to an oscillating circuit composed of a CMOS circuit and a control method thereof. Background technique [0002] In an oscillation circuit used as a reference clock generation source, a circuit in which a piezoelectric oscillator such as a crystal oscillator and a feedback resistance element are connected in parallel between the input and output of a CMOS inverter is widely used. Patent Document 1 discloses a technique for suppressing useless current consumption when oscillation stops in such an oscillation circuit. The oscillating circuit of Patent Document 1 is provided with a control circuit in which a feedback resistor is constituted by a MOS transistor, and a series circuit formed by connecting a second feedback resistor having a lower resistance value than the MOS transistor in series and a capacitive element is connected to the above-mentioned The MOS tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/353H03K5/00
CPCH03B5/364H03B5/06
Inventor 五十岚初日出
Owner NEC ELECTRONICS CORP
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