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Oscillator starting control circuit

A start-up control and oscillator technology, which is applied to power oscillators, electrical components, generator start-ups, etc., can solve problems such as inability to output oscillation frequency, shorten start-up time, increase power consumption, and stabilize start-up time Effect

Inactive Publication Date: 2006-04-19
コラボイノベーションズインコーポレイテッド
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In addition, since the frequency of the output waveform of the oscillation circuit depends on the capacitance value of the variable capacitance element as the load capacitance of the oscillator, when a variable capacitance element having a floating node (floating node) is used, the variable The capacitance value of the capacitive element changes due to the voltage change of the floating node, and after the start-up of the oscillation circuit, a constant oscillation frequency cannot be output.

Method used

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Experimental program
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Effect test

no. 1 approach

[0053] figure 1 It is a figure which shows the 1st Embodiment of the oscillator start-up control circuit of this invention.

[0054] exist figure 1 Among them, the REG voltage is applied to the oscillation circuit (1: oscillator) through the REG voltage circuit (2) to which the power supply voltage (17) is applied. figure 1 The oscillating circuit (1) is a crystal oscillating circuit as follows: the input and output of the inverter (14) are connected to the two ends of the crystal oscillator (15) and the two ends of the resistor (16), and the input is connected to the MOS. The drain of the variable capacitor (10), the output is connected to the drain of the MOS variable capacitor (11), the source of the MOS variable capacitor (10) is connected to the fixed capacitor (12), and the MOS variable capacitor (11 ) is connected to a fixed capacitor (13), and the other end of the fixed capacitor (12, 13) is connected to GND.

[0055] Furthermore, a resistor (18) and a switch (7:...

no. 2 approach

[0073] Figure 9 It is a diagram showing a second embodiment of an oscillator activation control circuit different from the first embodiment in the shape of a variable capacitance element (10) and the method of applying a voltage from a voltage control circuit (3, 22).

[0074] exist Figure 9 Among them, the REG voltage is applied to the oscillation circuit (1) through the REG voltage circuit (2) to which the power supply voltage (17) is applied. Figure 9 The oscillating circuit (1) is the following crystal oscillating circuit: the input and output of the inverter (14) are connected to the two ends of the crystal oscillator (15) and the two ends of the resistor (16), and then the input and output are connected to Capacitors (20), (21) for cutting off the control voltage applied to the MOS variable capacitor (10), the gate of the MOS variable capacitor (10) is connected to the first control voltage circuit (3), and the drain Connect to the second control voltage circuit (22...

no. 3 approach

[0080] Figure 10 It means that in order to improve the stability of the oscillation frequency after start-up, during a certain period of time generated by the time constant circuit 1 (6), the floating node is fixed by the switch (24) of the variable capacitance element (10). It is a diagram of the third embodiment in which the node is stabilized to an oscillating stable voltage, and the floating node is returned to the normal floating state after the above-mentioned certain period of time.

[0081] Figure 10 The oscillator circuit (1) is in Figure 9 The source of the MOS variable capacitor (10) of the oscillating circuit (1) is connected to the resistor (23) and the switch (24: the third switch), and the other end of the resistor (23) is connected to the third control voltage circuit (25) Crystal oscillator circuit.

[0082] On the other hand, the REG voltage detection circuit (4) is connected to transmit a signal for detecting the rise of the REG voltage circuit (2), an...

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Abstract

The present invention provides an oscillator start-up control circuit capable of shortening the start-up time, stably controlling the start-up time, and stabilizing the oscillation frequency after the start-up of the oscillation circuit. The oscillation circuit (1) is as follows: the input and output of the inverter (14) are connected to the two ends of the crystal oscillator (15) and the two ends of the resistor (16), and the input is connected to the MOS variable capacitor (10) Drain, connect the output to the drain of the MOS variable capacitor (11), connect the source of the MOS variable capacitor (10) to the fixed capacitor (12), connect the source of the MOS variable capacitor (11) to Fixed capacitor (13), connect the other end of the fixed capacitor (12, 13) to GND. Furthermore, the resistor (18) and the switch (7) are connected to the gate of the MOS variable capacitor (10), the resistor (19) and the switch (8) are connected to the gate of the MOS variable capacitor (11), and the resistor (18) is connected to the gate of the MOS variable capacitor (11). , 19) the other ends are connected to each other, and then connected to the voltage control circuit (3).

Description

technical field [0001] The present invention relates to an oscillator start-up control circuit suitable for shortening and controlling the start-up time of a crystal oscillator circuit and stabilizing the vibration frequency. Background technique [0002] In recent years, crystal oscillation circuits have been widely used as reference frequencies in electronic equipment, and the transmission data rate (rate) has been increasing. In such electronic devices, intermittent operation is performed for the purpose of low power consumption. Therefore, crystal oscillation circuits used as these reference frequencies are desired to start up in a short time and output a constant oscillation frequency with low power consumption. Therefore, crystal oscillation circuits are very useful as circuit technology. [0003] In addition, since the frequency output by the crystal oscillation circuit is used as a reference frequency in electronic equipment, it is necessary to activate the oscillat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/32H03L3/00
CPCH03B5/06H03B5/36H03L3/00
Inventor 长友圭新宫圭悟竹内久人
Owner コラボイノベーションズインコーポレイテッド
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