JPS60190006A - Piezoelectric oscillator - Google Patents

Abstract

PURPOSE:To obtain a multiple frequency with high accuracy by constituting the titled oscillator with a waveform distortion circuit distorting regularly an oscillated waveform obtained from an oscillation circuit oscillating a piezoelectric vibrator and a waveform shaping circuit obtaining a multiple of the oscillated frequency in the waveform having a regular distortion. CONSTITUTION:A piezoelectric vibrator 8 such as a crystal resonator in the oscillating circuit 7 is oscillated in a resonance frequency (fs). The oscillator consists of the waveform distortion circuit 9 distorting regularly the waveform of the oscillation frequency (fs) and the waveform shaping circuit 18 obtaining a frequency N.(fs) being N times the oscillated frequency (fs) from the waveform having the regular distortion. Fig. A shows a sinusoidal wave of a basic wave. The distorted wave regularly is obtained from the distorted wave shown in Fig. B by the waveform distortion circuit 9, and the distorted wave is formed into a two multiple wave as shown in Fig. C via the waveform shaping circuit 10. In order to obtain the two-multiple wave, a threshold value is set to the P axis in Fig. B so as to obtain trigger points (d), (e), (h), (i) and (n), (o), (r), (s)... and the wave has only to be outputted at the trigger points.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a piezoelectric oscillator that obtains a frequency that is a multiple of the resonance frequency of a piezoelectric vibrator.

[Prior art]

As an example of a piezoelectric oscillator that obtains a conventional multiplied wave, there is a PLL (Phase,
Figure 1 shows a piezoelectric oscillator to which the oscillator (locked, loop) is applied. In the figure, oscillation circuit 1 (hereinafter referred to as 08C
I) is a piezoelectric resonator 2 such as a crystal resonator at its resonant frequency f.
3 to oscillate. (This oscillation frequency llt, fa is PLI
, obtain a multiplied wave as the input signal of . ) The PLL has a phase comparator 6 (hereinafter referred to as "C0NIP5") inside.

Low-pass filter 4 (hereinafter referred to as LPF4), voltage controlled ωT oscillator 5 (hereinafter referred to as VCO5), frequency divider 6 (hereinafter referred to as IJI
V6) is a return yarn. In the same figure, C(JM
)'5 is controlled by the input signal f8 and the VCO5, and 1) the frequency fo/N (N is a multiplier) divided by IV4 is compared with each phase. And its output is L
is applied to the control terminal of the VCO 5 through PF 4,
The frequency of the VCOs is adjusted to reduce the oscillation frequency difference and phase difference between the input signal and the VCO 5. By making this circuit @) v-p! 113! [l1475”1
jJl f 0 - Nfs is obtained, and a piezoelectric oscillator having an output N times the resonant frequency of the piezoelectric oscillator is obtained.

The disadvantages of the conventional piezoelectric oscillators are, firstly, that they are complicated, difficult to miniaturize, and expensive.

As mentioned above, these are COMP, LPF, and VCo.

1) Dedicated integrated circuits such as IW (at least CO
MP,! : LPF, VCOLDIV co 3
(Type) (Dm combination is required, which complicates the structure, increases component cost and mounting cost, and makes it difficult to miniaturize.

The second drawback is that the frequency accuracy is unstable. This is due to the fact that the frequency sugar content depends on vCO, which has a limited accuracy.

Furthermore, if the precision of the VCo is to be further improved, the price will inevitably become even higher.

〔the purpose〕

The present invention is intended to solve this problem, and its purpose is to provide an inexpensive and compact piezoelectric oscillator that can obtain a highly accurate frequency multiplication.

〔overview〕

An oscillation circuit that oscillates a piezoelectric element, a waveform distortion circuit that regularly distorts the oscillation waveform obtained by the oscillation circuit, and a waveform with regular distortion by the waveform distortion circuit that adjusts the frequency of the oscillation wave. The piezoelectric oscillator is characterized by having a waveform shaping circuit twice as large as that for J.

〔Example〕

Before entering into a detailed description of the present invention, the background of the present invention will first be explained.

As is well known, when a piezoelectric resonator such as a crystal resonator is oscillated at a resonant frequency by an oscillation circuit, it exhibits a fundamental wave (sine wave) as shown in the waveform of Figure 2 (A). This fundamental wave is biased. It is also well known that when input to an amplifier such as a complementary circuit that is not applied, a waveform like the one shown in Fig. 2 (3) is shown. This waveform is a distorted wave, and 31-14 should be avoided as much as possible. Technical efforts are being made to find out how to approach the fundamental wave.

However, by using this distorted wave in reverse, Mizude 1i1 can very easily trace the cheap 1st song with high precision wave 1.
A long time ago, I was able to see that it was possible to obtain waves.The present research is a pressure ``fF optical oscillator'' that utilizes this.
, Mi examples will be explained in detail.

FIG. 6 is a block diagram showing an embodiment of the present invention, in which an oscillation circuit 7 causes a piezoelectric vibrator 8, such as a crystal vibrator, to oscillate at its resonant frequency fs. Waveform distortion times that regularly distort the waveform of this oscillation frequency fs? 9, and a waveform oscillation frequency f having regular distortion due to the waveform distortion circuit 9;
The waveform shaping circuit 10 obtains a frequency Nfs that is N times higher than s.

The multiplied wave obtained by this example will be explained with reference to the waveform diagram of FIG. 4. Figure 2 (A) shows a sine wave with the same fundamental wave as Figure 2 (A), and Figure 2 (B) shows a distorted wave. ) is shown with a slightly different waveform from the distorted wave. As explained in the conventional example, it is well known that the distorted wave shown in FIG. There is. In this example, the distorted wave shown in FIG. 4B, which is regularly distorted by the waveform distortion circuit 9, is obtained by the waveform shaping circuit 10. As an example of the multiplication wave (2 to n (+: S wave)), the second harmonic wave is shown in (C) of the figure, and the sixth harmonic wave is shown in (L) of the same figure. In order to obtain the second harmonic wave shown in the same figure (C), P
Set a threshold on the axis and use d, e, h, as trigger points.
It is sufficient to obtain i, n, o, r, s, etc. and output them at this trigger point. Similarly, to obtain the third harmonic wave shown in (1) in the same figure, set a threshold on the Q axis in (B) in the same figure, and set the trigger point at 8% bz 0% fs.
gz j and % 'z mz 9% 9% t""
Similarly to the second harmonic wave, it is sufficient to output it at this trigger point.

The waveform distortion circuit 9 used in the present invention was explained using an amplifier such as a complementary circuit that does not apply bias in this book 1, but as is clear from the above explanation, it is a waveform distortion circuit 9 that produces a regular distorted wave. The present invention can be implemented using a Jl multi-distortion circuit.The waveform shaping circuit 10 is capable of setting a threshold value for a waveform at an arbitrary level, obtaining a trigger point, and outputting it. Although it is possible, the applicant has obtained the harmonics of 1J using an intensifier, a comparator, or a gate circuit. In this example, 2nd and 5th harmonic waves have been explained as the multiplied waves, but any multiplied wave can be obtained by changing the distorted wave shown in FIG. 3(B).

FIG. 5 shows the circuit configuration of a piezoelectric oscillator that the present applicant suddenly obtained a frequency twice the oscillation frequency. , the oscillation frequency fs is obtained.The waveform distortion circuit 14 obtains a distorted waveform by overamplifying the waveform of the oscillation frequency fs in a two-stage amplification section composed of a NOR gate 15, and the distorted waveform is transmitted to the gate circuit 17.18. The waveform shaping circuit 16 made up of
alVIHz is output as a double wave of the oscillation frequency fs.

〔effect〕

1. The piezoelectric oscillator of the present invention achieves high-precision communication by combining a waveform distortion circuit with a stable amplification factor and a waveform distortion circuit with a stable threshold value. It has a simple IY11 configuration consisting only of circuits and waveform shaping circuits, and can be mounted on 14.1 integrated circuits, making it possible to significantly reduce component costs and mounting costs, and also achieve miniaturization. .

3. When it is formed into the same shape as a DIP type IC (74), it can be handled as a single element. When mounting each inserted device on a circuit board, it can be mounted in a short time using an inserter m/c. Possible (0 becomes

[Brief explanation of the drawing]

Figure 1 is a block diagram of a conventional example. Figure 2 is a waveform diagram, and (8) shows the fundamental wave.
) is a distorted wave.FIG. 3 is a block diagram showing an embodiment of the present invention.FIG. 5 is a block diagram showing an example of the configuration of the present invention.・LPF5-V C0
6-DI V 7...Oscillation circuit 8...Piezoelectric vibrator 9...Waveform distortion circuit 10...Waveform shaping circuit 11...Oscillation circuit 12...Inverter 16...Piezoelectric vibrator 14
... Waveform distortion circuit 15 ... NOR gate 16.
...Waveform shaping circuit 17.18...Gate circuit 19.
...Resistance Rr20...selection t71; Rs or more Applicant Matsushima Kogyo Co., Ltd. \L ^ "P1

Claims (1)

[Claims] an oscillation circuit that oscillates a piezoelectric vibrator, and an oscillation circuit that oscillates a piezoelectric vibrator)
A piezoelectric device comprising: a waveform distortion circuit that regularly distorts the obtained oscillation waveform; and a waveform shaping circuit that uses the waveform distortion circuit to obtain a regularly distorted waveform by multiplying the frequency of the oscillation wave. Oscillator,.