Oscillation circuit

Abstract

An oscillation circuit comprises an oscillator, further comprising a resonance frequency, an amplifier that is connected to the oscillator, an energized pulse emission unit, which emits a pulse of a frequency, from among the resonance frequency, which falls within a given range, a switching unit, which switches between the energized pulse emission unit being connected to, and disconnected from, the oscillator and the amplifier, and an operation instruction unit, which issues an instruction signal to the energized pulse emission unit to commence operating, wherein the switching unit connects the oscillator and the energized pulse emission unit during an interval that commences at the time that the operation instruction unit issues the operation instruction, the interval comprising one cycle, half a cycle, or a plurality of cycles of pulses that the energized pulse emission unit emits.

Description

technical field [0001] The present invention relates to an oscillation circuit that shortens the time from driving to oscillation stabilization of an oscillation circuit using an oscillator. Background technique [0002] Devices using batteries generally require power saving. For example, an ultrasonic flowmeter using a battery operates intermittently within the range allowed by flow measurement accuracy in order to save power. The ultrasonic flowmeter measures the propagation time of ultrasonic waves to obtain the flow velocity, and calculates the flow rate by multiplying the flow velocity by the cross-sectional area of ​​the pipe. Ultrasonic propagation time measurement uses pulses with a fixed period, counts the number of pulses from the transmission of ultrasonic waves to the reception of ultrasonic waves, and multiplies the number of pulses by the pulse cycle to obtain the propagation time of ultrasonic waves. When intermittent flow measurement is performed, it is of ...

AI Technical Summary

Problems solved by technology

[0007] This method is an effective means to speed up the start-up of the oscillation circuit section, but there is a problem that the circuit configuration becomes complicated by providing a ring oscillator including a current source having a temperature correction function, etc.

[0009] However, in the above configuration, in order to provide a pulse from the outside to the oscillation circuit section at the initial stage of startup of the oscillation circuit section to speed up startup of the oscillation circuit section, a ring oscillator including a current source with a temperature correction function is provided, so there is a circuit structure complicated question

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