JPS60190018A - Frequency multiplier circuit - Google Patents

Abstract

PURPOSE:To obtain a multiple wave with a small sized and inexpensive circuit and high accuracy by combining a waveform distortion circuit having a stable amplification factor and a waveform shaping circuit obtaining a stable threshold value. CONSTITUTION:The titled circuit consists of the waveform distortion circuit 5 distorting regularly the waveform of an input frequency (fs) and the waveform shaping circuit 6 multiplying said output waveform by N times the frequency (fs). A distortion wave shown in Fig. B is obtained from the fundamental wave shown in Fig. A in the circuit 5 by overamplification of an amplifier. In order to obtain a two-multiple wave, e.g., shown in Fig. C from the distorted wave by the waveform shaping circuit 6, a threshold value is set to a P axis in Fig. B, trigger points (d), (e), (h), (i) are obtained and an output is obtained at the trigger points. In order to obtain a three-multiple wave similarly, a threshold value is set to a Q axis and points (a), (b), (c), (f), (g), (j) are used as trigger points.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a frequency multiplier circuit that obtains a multiplied wave of a human power wave.

[Prior art]

To obtain the conventional multiplication wave, FM stereo subcarrier reproduction 1
．． PLL (Phase-Locked-L) is a well-known frequency multiplier circuit used in transceivers etc.
oop ) f shown in Figure 1. In the same figure, the PLL
is a feedback circuit which internally has a phase comparator 1 (hereinafter referred to as OOMPl), a low-pass filter 2 (hereinafter referred to as LPF2), a suppressor generator 5C or lower (VOO5), and a frequency divider 4 (hereinafter referred to as D-V4). It is a system. In the same figure, OOMP1 is voltage controlled by input signals fs and V2O3, and f) by DIV4.
The frequency divided into fo / N (NU; i[L[) and each phase are compared. And its output is LPF2
'i is applied to the control terminal of the VOO5, and changes the frequency of VCII in the direction of reducing the oscillation frequency difference and phase difference between the input signal and the VOO5. By looping this circuit, j) fo = Nfs can be obtained.The disadvantages of conventional frequency multiplier circuits are, firstly, that they have a complicated structure, making it difficult to miniaturize, and that they are expensive. That's true. This is OOMP as described by Nil.

It requires a combination of dedicated integrated circuits such as LPF and VCO1D (at least three types: OOMP, I, PF, and VOO1D), which complicates the structure and increases component costs and mounting costs. This is due to the fact that it is difficult to miniaturize the device. The second drawback is that frequency accuracy is unstable. Is this a frequency? :
The reason lies in the fact that the power level depends on the VCO, which has a limited accuracy. Moreover, if you try to improve the accuracy of the VCO, the commercial price will be even more prohibitive.

〔the purpose〕

The present invention is intended to solve these problems, and its purpose is to provide an inexpensive and compact frequency multiplier circuit that can obtain a multiplication frequency with high precision.

〔overview〕

A waveform distortion circuit that regularly distorts the waveform of the input frequency, and a regular distortion caused by the distorted waveform circuit? The frequency multiplier circuit is characterized in that it is configured with a 7b waveform shaping circuit that multiplies the frequency of an input wave.

[Example of real sister]

Background of the present invention
First of all, let me explain.

As is well known, when a piezoelectric vibrator such as a crystal vibrator is oscillated at a resonant frequency by an oscillation circuit, it exhibits a fundamental wave (sine wave) as shown in the waveform of FIG. 2(A).

It is also well known that when this fundamental wave is inputted to an amplifier such as a complementary circuit which is not biased, a waveform as shown in FIG. 2(B) is exhibited. This waveform is a distorted wave, and technical efforts are usually made to eliminate it as much as possible and make it as close to the fundamental wave as possible.

However, by reversing this distorted wave, the present applicant was able to very easily obtain a multiplied wave at low cost and at a still high nitric strength.

The present invention is a frequency multiplier circuit for this purpose, and will be explained in detail below using actual foil examples.

FIG. 5 is a block diagram showing an embodiment of the present invention, which includes a waveform distortion circuit 5 that regularly distorts the input waveform of frequency f8, and a waveform that is regularly distorted by the waveform distortion circuit 5. Frequency Nfs that is N times the frequency f8 of the input wave
'((It is composed of the obtained waveform shaping 1i and the circuit 6. The multiplied wave obtained by this example will be explained based on the waveform diagram of FIG. 4. figure(
Figure 2 (B) shows a sine wave with the same fundamental wave as in A), and a distorted wave in Figure 2 (B) to facilitate the explanation of this example.
) is shown as a waveform tS. As explained in the conventional example, it is well known that the distorted wave shown in FIG. 4(B) is caused by excessive amplification of an amplifier, etc., and the waveform distortion circuit 5 of the present invention also uses this. In this example, the distorted wave shown in FIG. 4(B), which is regularly distorted by the waveform distortion circuit 5, is obtained by the waveform shaping circuit 6. (C) shows the second harmonic wave, and (D) shows the sixth harmonic wave. Same figure (0)
In order to obtain the second harmonic of
O, r, g...0. should be obtained and output at this trigger point. Similarly, in order to obtain the same sixth harmonic wave (D), a threshold value is set on the Q axis in (B) of the same figure, and a is set as the trigger point.

b, Qs, f, gs j and to, 1, m, plq
.

t... and output it at this trigger point like the second harmonic wave. In this example, the waveform distortion circuit 5 used in the present invention is an amplifier such as a complementary circuit that does not apply bias.As is clear from the above explanation, the waveform distortion circuit 5 is a waveform distortion circuit that can obtain a regular distorted wave. If it is a circuit, 31 of the present invention! Martyrdom is possible. However, the present invention can be implemented as long as the waveform shaping circuit 6 can set a threshold to set the waveform at an arbitrary level, obtain a trigger point, and output the signal. The above-mentioned multiplication wave is obtained by using 'J' or a gate circuit in Himaki. In this example, double and triple waves have been explained as the multiplied waves, but any multiplied wave can be obtained by changing the distorted wave shown in FIG. 5(B).

〔effect〕

1. Yumei Moto's frequency multiplier circuit is extremely commercially available because it can output the frequency of the multiplied wave by combining a waveform distortion circuit with a stable model rate and a waveform shaping circuit with a stable threshold value. Accurate multiplication waves can be provided.

2. Simple 4 with only ujl type distortion circuit and waveform shaping circuit
Because of ItbX, it is possible to mount it in one go with an integrated circuit, and it is possible to reduce component cost and mounting cost to a large extent, and it is also possible to realize miniaturization.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a conventional example. Figure 2 shows a waveform diagram, where (A) is the fundamental wave and CB
) is a distorted wave. FIG. 3 is a block diagram showing an embodiment of the present invention. FIGS. 4(A) to 4(D) are waveform diagrams for explaining a practical example of the present invention. 5 is a waveform distortion circuit 6 is a waveform shaping circuit Applicant: Matsushima Kogyo Co., Ltd. 1 Figure; 1 = 2 Figure

Claims (1)

[Claims] A waveform distortion circuit that regularly distorts the waveform of the input frequency, and a regular distortion caused by the waveform distortion circuit? 1. A frequency multiplier circuit comprising: a waveform shaping circuit that obtains a waveform by multiplying the frequency of an input wave.