JPS5948562B2 - harmonic generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a harmonic generator for obtaining signals of higher harmonics of an input signal frequency.

In communication systems such as data communications, various clocks are created based on carrier waves regenerated on the receiving side, and in this case, a harmonic generator that uses the regenerated carrier wave as an input signal is used. .

Such a conventional harmonic generator has the configuration shown in FIG. 1, for example, and FIG. 2 is a waveform diagram illustrating its operation. Assuming that the human input signal a is a sine wave shown in FIG. 2 g, ,
The signal is doubled in a doubling circuit K, resulting in a signal having a frequency twice that of the input signal a, as shown in FIG.

This signal C is converted into a rectangular wave signal C by a waveform shaping circuit IP, and is applied to a flip-flop FF and a monostable multi-bibreak MM.

This monostable multivibrator MM is triggered by the rising edge of signal C and outputs a pulse signal d shown in FIG. 2d.

Furthermore, the Q terminal output e and the Q terminal output f of the flip-flop FF are the period of the signal C doubled, as shown in FIG. 2 e and f, respectively.

Signals d and e are applied to the AND gate G1, and signals d and f are applied to the AND gate G2.
The output signals g and h of G2 are as shown in FIG. 2g and h, and the output signal i via the pulse transformer T has an input signal frequency f as shown in FIG. 2i.

Then, the signal has a frequency of (2nl)fo.

Also, the output signal d of the monostable multi-bibreak MM is 2nf
The frequency will be □.

Note that AI and A2 are pulse amplifiers.

As mentioned above, the frequency f of the human input signal a.

Although it is capable of outputting harmonic signals of even multiples and odd multiples of harmonics, it requires a flip-flop FF to obtain harmonics of odd multiples.

An object of the present invention is to enable even odd-numbered harmonics to be generated by a logic circuit without using flip-flops.

Examples will be described in detail below.

FIG. 3 is a harmonic generator according to an embodiment of the present invention, and FIG. 4 is a waveform diagram illustrating its operation, ignoring delay time.

Also, the same reference numerals as in FIG. 1 indicate the same parts.

- The waveform shaping circuit IP that adds the output to the double multiplier circuit is composed of a Nant gate G3, and the monostable multivibrator MM is composed of Nant gates G4, G5, and a capacitor C.
2 and a resistor R2, the resistor R1 and capacitor C1 are a doubler circuit K and a waveform shaping circuit IP.
and a delay circuit to match the delay time caused by the monostable multi-bibreak MM.

Further, G6 to G9 indicate Nant gates.

Frequency f.

The input signal a is doubled by a doubling circuit K to become as shown in FIG. 4, and is converted into a rectangular wave by a waveform shaping circuit IP.

The output signal C of the NAND gate G4 of the monostable multivibrator MM to which the output of this waveform shaping circuit IP is applied is as shown in Fig. 4C, and the output signal d of the monostable multivibrator MM is as shown in Fig. 4D. As shown, C2, R2
The pulse width corresponds to the time constant of .

This output signal d is amplified by the pulse amplifier A2 and output as an even harmonic 2nf□ signal.

On the other hand, the output signal e of the Nandt gate G6 to which the input signal a is applied via the delay circuit consisting of the resistor R1 and the capacitor C1 is the frequency f of the input signal a, as shown in FIG. 4e.
.

The output signal f of the NAND game (Nando game) G7 to which the output signal e is added is the inversion of the output signal e, as shown in FIG. 4f.

Signal d is applied to Nantes gate G8. Since the signals d and f are added to G9 (e, Nandogame), Nandogame'-)G8.
The output signals g and h of G9 are as shown in Fig. 4 g and h, and these output signals g and h are connected to the pulse transformer T.
is added to the primary side of

Therefore, an output signal i shown in FIG. 4i appears on the secondary side of the pulse transformer T, which is amplified by the pulse amplifier A1 and output as an odd harmonic (2nl) fo signal.

In this way, in order to obtain odd harmonics, a flip-flop FF as in the conventional example is not required, and the circuit configuration becomes simple.

Although the above-mentioned embodiment uses a Nandt gate as a raw material, it goes without saying that other gate circuits can be used, and other pulse conversion circuits can also be used in place of the monostable multivibrator MM. can.

As explained above, the present invention doubles the input signal frequency, then forms a pulse signal with a repetition period of 1/2 the input signal frequency, and also forms a rectangular pulse signal with a repetition period of 1/2 the input signal frequency. By forming a wave signal, adding a pulse signal and a rectangular wave signal to a gate circuit, and distributing every other pulse signal, one of them has positive polarity and the other one has negative polarity, thereby generating an odd harmonic signal. Since it can be constructed with a normal gate circuit without using a flip-flop, it has the advantage of being an inexpensive construction.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional harmonic generator, FIG. 2 is an explanatory diagram of its operation, FIG. 3 is a block diagram of an embodiment of the present invention, and FIG. 4 is an explanatory diagram of its operation. K is a doubler circuit, IP is a waveform shaping circuit, MM is a monostable multi-by-break, T is a pulse transformer, At and A2 are pulse amplifiers, and G3 to G9 are Nant gates.

Claims (1)

[Claims] 1 In a harmonic generator that generates high-order harmonics of a human signal frequency, a doubling circuit doubles the input signal frequency, and the output of the doubling circuit is waveform-shaped and converted into a pulse signal with a predetermined pulse width. A circuit that converts the repetition period of the pulse signal to 1/2 times the input signal frequency; a circuit that converts the input signal into a rectangular wave signal with a repetition period of 1/2 the frequency of the input signal; A gate circuit that adds a rectangular wave signal and the pulse signal, distributes the pulse signal every other pulse, and sets one of the distributed pulses as positive and the other as negative polarity to obtain an odd-order harmonic signal of the input signal frequency. A harmonic generator characterized by: