JPS62101103A - Intermittent operation temperature compensation piezoelectric oscillator - Google Patents

Abstract

PURPOSE:To obtain an oscillation frequency subjected to temperature compensation just after power application and just after the oscillation start state from the oscillating stop state at intermittent operation by using two independent oscillation circuits obtaining temperature information as a temperature sensor. CONSTITUTION:The oscillation circuits 1, 2 are oscillation circuits having mutually independent frequency characteristics against temperature and the frequency of the oscillation circuit 2 is counted with respect to the oscillation circuit 1. A gate signal is fed from a reference clock generating circuit 3 to a frequency counter 4 and the counted frequency is inputted to an address of a memory 5 as real time temperature information. The data in the memory 5 is written as a data required for temperature compensation of a piezoelectric vibrator 9 in advance, the data is shared by a decoder 6 and a unit load capacity deltais increased/decreased by controlling the switch 7 to apply temperature compensation of the oscillation frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circuit configuration of a temperature-compensated piezoelectric oscillator that operates intermittently.

[OJE requirements for invention]

The present invention provides a temperature-compensated piezoelectric oscillator that operates intermittently, (1) having two oscillation circuits, first and second, having independent temperature characteristics; a frequency counter to be measured, a memory for storing temperature information of the frequency measured by the counter, and a third device in which the oscillation frequency is controlled and compensated by the data instructing the memory to detect the temperature information from the counter. A piezoelectric oscillation circuit, a timer based on the oscillation frequency of the reference oscillation circuit of the frequency counter, and a switching circuit that makes the oscillation frequency of the reference oscillation circuit of the frequency counter as a reference; , said No. 1. By setting the oscillation frequency of the second oscillation circuit to be sufficiently lower than the oscillation frequency of the third oscillation circuit, highly accurate temperature compensation and low power consumption are realized.

[Prior technology]

The previous intermittent operation temperature compensated piezoelectric oscillator was patented in 1983-
131089, the frequency of the oscillation circuit 2 as a temperature sensor whose oscillation frequency changes linearly depending on the temperature is a counter based on the frequency division same wave number obtained from the piezoelectric oscillation circuit 17. A memory 5 which measures and obtains temperature information by 4 and stores this in advance.
The piezoelectric oscillator circuit is temperature-compensated by detecting real-time temperature information.When the temperature-compensated piezoelectric oscillator is operated intermittently, the simple oscillation circuit 16 shown in FIG.
and a timer circuit 13 for operating a switching circuit 14 at appropriate time intervals.

[Problems and objects to be solved by the invention] However, the temperature-compensated piezoelectric oscillator of the prior method shifts from the oscillation stop state to the oscillation start state immediately after power is turned on to the piezoelectric oscillation circuit 17 and when the piezoelectric oscillation circuit 17 is operated intermittently. Immediately after, temperature information is obtained from the frequency temperature sensor using the oscillation frequency of the piezoelectric oscillation circuit 17 as a reference, and temperature compensation is performed for the piezoelectric oscillation circuit. The problem was that they were not compensated. SUMMARY OF THE INVENTION The present invention is intended to solve these conventional problems, and its purpose is to change the piezoelectric oscillation circuit 17 from the oscillation stop state to the oscillation start state immediately after power is turned on and when the piezoelectric oscillation circuit 17 is operated intermittently. The object of the present invention is to obtain an intermittent-operating temperature-compensated piezoelectric oscillator that enables temperature compensation even immediately after the operation.

[Means for solving problems]

The intermittent operation temperature compensated piezoelectric oscillator of the present invention has first and second
an oscillation circuit having two independent temperature characteristics, a frequency counter that measures the oscillation frequency of the other using one of the oscillation circuits as a frequency reference, and a memory that stores temperature information of the frequency measured by the counter. and a third piezoelectric oscillation circuit whose oscillation frequency is controlled and compensated by the data that the memory detects temperature information from the counter and instructs, a timer based on the oscillation frequency of the reference oscillation circuit of the frequency counter, and the timer. a switching circuit for intermittently operating the oscillation of the third piezoelectric oscillation circuit; The oscillation frequency of the second oscillation circuit is set lower than the oscillation frequency of the third oscillation circuit.

[Effect]

According to the above configuration of the present invention, the reference oscillation circuit of the counter that sharply measures the frequency of the oscillation circuit as a temperature sensor is provided separately from the piezoelectric oscillator that provides the originally required frequency, and is kept in operation at all times. This means that the data necessary for temperature compensation is always available, and the piezoelectric oscillator that provides the originally required frequency operates immediately after power-on or intermittently. 2m
J-+x 1. %, it is possible to obtain a temperature-compensated oscillation frequency.

〔Example〕

An embodiment of the intermittent operation compensation type piezoelectric oscillator of the present invention will be described below with reference to FIG. The oscillation circuit 1.2 is an oscillation circuit that has the same wave number characteristics that are independent of each other with respect to temperature, and counts the frequency of the oscillation circuit 2 using the oscillation circuit 1 as a reference. A gate signal is sent from the reference clock generation circuit 3 to the frequency counter 4, and the counted frequency is stored at an address in the memory 5 as real-time temperature information.

The data in the memory 5 is written in advance as data necessary for temperature compensation of the piezoelectric vibrator 9, and is distributed by the decoder 6, and the unit load capacity δ is increased or decreased by controlling the switch 7 to adjust the oscillation frequency. temperature compensation. 1o is an inverter that causes the piezoelectric vibrator 9 to oscillate, and 11 is a gate capacitor. On the other hand, for intermittent operation, the timer circuit 13 generates an appropriate timer signal from the clock from the reference clock generation circuit 3. Hitsuji 7 turns on with H defeat A and makes it 0FIF.

In the embodiments described above, real-time temperature information is obtained by the temperature compensation circuit by keeping the oscillation circuits 1 and 2 operating at all times, and the power supply to the oscillation circuit including at least the piezoelectric vibrator 9 is By timing the temperature compensation at the time of power-on and at the start of oscillation in intermittent operation, immediately after the oscillation circuit including the piezoelectric vibrator 9 is turned on and the oscillation stop state during intermittent creation shifts from the oscillation stop state to the oscillation start state. Also, a temperature-compensated oscillation frequency can be obtained. FIG. 5 shows the output waveform and timing chart of the piezoelectric oscillator. 101 is the temperature compensation timing, 102 is the power supply switching waveform, 105 is the output waveform of the piezoelectric oscillator, T is the period of intermittent operation, 70 is the operating time, and t is the time when the power is turned off after the oscillation of the piezoelectric vibrator 9 starts. If the timing of temperature compensation is set at least at the rising edge of the power supply switching waveform, a temperature-compensated frequency can be obtained from the rising edge of oscillation of the piezoelectric vibrator 9.

In addition, oscillation circuits 1 and 2 are examples of oscillation circuits.Oscillation circuit 1 is composed of a low frequency crystal oscillation circuit in order to improve the accuracy of temperature compensation, and oscillation circuit 2 is composed of a CR oscillation circuit that can incorporate a mechanical C, etc., and the oscillation frequency By setting sufficiently lower than the oscillation frequency of the piezoelectric vibrator 9, the current consumption OP including the oscillation circuits 1 and 2 and the signal processing circuit necessary for compensation can be reduced to the value shown by the following general formula. It is possible to hold it down.

÷ OpoeA()+BJ5 H/f: Oscillation surface wave number A, B, &: Constant [Oscillation effect] According to the intermittent operation compensated piezoelectric oscillator of the present invention, two independent oscillation circuits obtain temperature information. By using the oscillator as a temperature sensor and constantly performing temperature compensation, the oscillation frequency is temperature-compensated even immediately after the intermittent operation type piezoelectric oscillator is turned on and immediately after it transitions from the oscillation stop state to the oscillation start state during intermittent operation. is obtained. As a result, the pulse width of the intermittent operation state can be reduced, and power consumption can be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an intermittent operation temperature compensated piezoelectric oscillator circuit. FIG. 2 is a block diagram of the preceding intermittent operation temperature compensation WaE'[1 oscillator circuit. FIG. 5 shows the output waveform and timing chart of the piezoelectric oscillator. 1... Oscillation circuit 2... Oscillation with temperature characteristics independent from 1 6... Reference clock generation circuit 4... Frequency counter 5... ... Memory 6 ... Decoder 7 ... Capacitor 8 ON, OFF switch 8 ... Capacitor 9 ... Piezoelectric vibrator 10 ... Inverter 11... Gate capacity 12... Output terminal 13... Timer circuit 14... Switching circuit 15... Power supply 16...・Oscillation circuit 17...Piezoelectric oscillation circuit and above

Claims (2)

[Claims] (1) A first and second oscillation circuit having two independent temperature characteristics; a frequency counter that measures the oscillation frequency of one of the oscillation circuits using the other as a frequency reference; A memory for storing temperature information, a third piezoelectric oscillation circuit whose oscillation frequency is controlled and compensated based on the data that the memory detects and indicates the temperature information from the counter, and an oscillation frequency of the reference oscillation circuit of the frequency counter. 1. An intermittent operation temperature compensated piezoelectric oscillator, comprising: a timer based on . (2) The intermittent operation temperature compensated piezoelectric oscillator according to claim 1, wherein the oscillation frequencies of the first and second oscillation circuits are lower than the oscillation frequency of the third oscillation circuit.