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Very low power consumption quartz crystal oscillation circuit

A technology of quartz crystal and oscillator circuit, which is applied in the field of microelectronics, can solve the problems of large voltage drop and mutual interference of MOS tubes, and achieve the effect of reducing device cost, reducing power consumption, and eliminating mutual conflict and interference

Inactive Publication Date: 2019-01-25
广州市力驰微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cause some MOS tubes to have a large pressure drop or often interfere with each other

Method used

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  • Very low power consumption quartz crystal oscillation circuit
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  • Very low power consumption quartz crystal oscillation circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Such as figure 1 , 2 As shown, the ultra-low power consumption quartz crystal oscillation circuit includes 4 P-type MOS transistors, 4 N-type MOS transistors, 1 inverter, 1 delay unit (Delay), 1 operational amplifier (OPA), Two current sources (IH, IL) and two switches (S1, S2) are connected in the following ways:

[0025] The lower end of the current source IH is connected to the upper end of the switch S1; the lower end of the current source IL is connected to the upper end of the switch S2; the lower end of the switch S1 is connected to the lower end of the switch S2, the drain of the first N-type MOS transistor NM1, the first N-type MOS The gate of the transistor NM1 is connected to the gate of the second N-type MOS transistor NM2; the drain of the second N-type MOS transistor NM2 is connected to the inverting input terminal of the operational amplifier (OPA), and the drain of the first P-type MOS transistor PM1 1. The gate of the first P-type MOS transistor PM1 i...

Embodiment 1

[0032] Embodiment 1 working principle:

[0033] Quartz crystals work with a larger current during the start-up phase. After the quartz crystal oscillates stably for a certain period of time, by reducing the tail current of the quartz crystal oscillator amplifier, the quartz crystal oscillates stably at the nanoampere-level working current.

[0034] 1. The oscillation amplifier circuit of the quartz crystal is composed of PM3 and NM4 tubes, and the working current of these two tubes is determined by the drain current and drain voltage of the NM3 tube;

[0035] 2. In the start-up stage of the quartz crystal, the drain current of the NM1 tube is supplied by the current source IH with a larger current;

[0036] 3. In the start-up stage of the quartz crystal, the VC1 terminal is at a low level, and the PM4 tube is turned on. At this time, the gate voltage of the NM3 tube is VDD, so that the oscillation amplifier circuit of the quartz crystal works under a large operating current; ...

Embodiment 2

[0043] Such as figure 2 As shown, the delay unit includes an input terminal A, an output terminal B, 4 NOT gate chips, two potentiometers and two capacitors, and the power supply VDD of the ultra-low power consumption quartz crystal oscillator circuit is respectively connected to the first potential The input terminal of the device R1 and the input terminal of the second potentiometer R2, the output terminal of the first potentiometer R1 is respectively connected to the output terminal of the first NOT gate chip CD1, the input terminal of the second NOT gate chip CD2 and the first capacitor The positive pole of C1, the input terminal A is connected to the input terminal of the first inverter chip CD1, the negative pole of the first capacitor C1 is grounded, the output terminals of the second potentiometer R2 are respectively connected to the output terminal of the second inverter chip CD2, the third The input terminal of the NOT gate chip CD3 and the positive pole of the seco...

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Abstract

The invention relates to the technical field of microelectronics, in particular to a very low power consumption quartz crystal oscillation circuit. The very low power consumption quartz crystal oscillation circuit comprises four P-type MOSFETs, four N-type MOSFETs, one inverter, one delay unit (Delay), one operational amplifier (OPA), two current sources (IH, IL) and two switches (S1, S2). The circuit is divided into two phases, the power dissipation of the circuit in the start-up phase is large, and the start-up of the circuit is completed under various complicated conditions. After the circuit works normally, the power dissipation of the circuit can be reduced by controlling the tail current and the amplitude of the oscillator, so that the working current of the oscillator can be reducedto less than 200nA, and the normal operation of the circuit can be maintained. At the same time, the internal integration of operational amplifier, delay unit, high-precision current source and quartz oscillator circuit greatly reduces the overhead of the system, but eliminates the collision and interference.

Description

technical field [0001] The invention relates to the technical field of microelectronics, in particular to an ultra-low power consumption quartz crystal oscillation circuit. Background technique [0002] Quartz real-time clock is a time measurement system commonly used in real life, which has the advantages of high time accuracy, good consistency, and obvious cost advantages. It has been widely used in various watches, time display, time charging, standard time, time-sharing measurement and other fields. With the gradual reduction of the cost of quartz and the rapid development of semiconductor technology, the quartz oscillating clock system will gradually replace the traditional clock system and become the mainstream real-time clock measurement system. At present, the crystal resonant circuit made of aluminum gate technology has poor timing consistency, insufficient circuit adjustment ability, and high power consumption, which has become the bottleneck of the current real-t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04H03B5/12
CPCH03B5/04H03B5/1206H03B5/1228
Inventor 林美玉
Owner 广州市力驰微电子科技有限公司