JPS62131622A - Programmable variable wavelength oscillator - Google Patents

Abstract

PURPOSE:To obtain a desired pattern signal with simple constitution by providing a storage section storing a pattern signal having plural wavelength changes to a high-order address and a resistance value signal corresponding to each pattern to a low-order address and a register designating a desired pattern for an RC oscillator. CONSTITUTION:The RC oscillator is provided with a ROM 7 storing a pattern signal having plural wavelength changes to its high-order address and a resistance value signal of each pattern signal to its low-address respectively, a register 9 designating a desired pattern signal from the plural pattern signals, a clock generator 10 being a means reading the resistance value signal of the designated pattern in time series and a counter 8 counting a clock signal additionally. Thus, a signal having the same waveform as the designated waveform by a pattern selection data path is oscillated.

Description

[Detailed Description of the Invention] [Summary] A programmable variable wavelength oscillator, which stores a required wavelength change pattern in an upper address and a resistance value signal corresponding to the wavelength change pattern in a lower address in advance in a storage unit. , the desired pattern and the resistance value signal of the pattern are sequentially read out in time series, the resistance of the RC oscillator is switched in accordance with the read resistance value signal, and the RC oscillator generates a signal having the same waveform as the desired waveform. This makes it possible to oscillate.

[Industrial application field]

The present invention relates to a programmable variable wavelength oscillator, and particularly to a programmable variable wavelength oscillator.
The present invention relates to a programmable variable wavelength oscillator that can oscillate a signal having a pattern with a desired wavelength changed using a C oscillator.

RCC generators with variable frequencies are often used to test the frequency characteristics and transmission characteristics of equipment such as communication and information processing equipment.

In these characteristic tests, it is necessary to test not only with a conventional fixed pattern signal but also with a pattern signal with a desired wavelength change, and there has been a demand for a variable wavelength oscillator for this purpose.

[Conventional technology]

FIG. 3 shows a connection diagram of an RC oscillator, in which an oscillator 1 using a CMO3 IC, a capacitor 2 and a variable resistor 3, and the variable resistor 3 are connected via changeover switches 4-1 to 4-n, respectively. Changeover switches 4-1 to 4-n are connected to an RC oscillation circuit using a feedback circuit configured by resistors 5-1 to 5-n.
It has a control section 6 that controls switching of 4-n.

Its operation is that oscillator 1 has a phase rotation of 1 from output to input.
It oscillates at a frequency of 80°, and its phase rotation is defined by the variable resistor 3, each of the resistors 5-1 to 5-n, and the capacitor 2,
By switching each resistor using changeover switches 4-1 to 4-n, signals with different frequencies are oscillated.

Therefore, by operating the control unit 6, the changeover switches 4-1 to 4-
n is switched to obtain a signal of a predetermined frequency.

[Problem that the invention seeks to solve]

The above-mentioned RC oscillator can be used to test the frequency characteristics and transmission characteristics of equipment such as communication and information processing equipment by oscillating signals of various frequencies, but for certain test purposes, it is difficult to generate a desired wavelength change pattern. There is a problem in that it is not possible to test using the signal that you have.

The present invention was created in view of these points, and the RC
It is an object of the present invention to provide a programmable variable wavelength oscillator that can oscillate a pattern signal having a desired wavelength change with a simple configuration using an oscillator.

[Means for solving problems]

FIG. 1 shows a block diagram of the programmable variable oscillator of the present invention.

In FIG. 1, a conventional RC oscillator is equipped with a storage section (ROM) that stores pattern signals having a plurality of required wavelength changes in upper addresses and resistance value signals corresponding to each of the patterns in lower addresses. 7, a register 9 for specifying a desired pattern from among the patterns stored in the upper addresses of the storage unit 7, and a register 9 for specifying a desired pattern from among the patterns stored in the upper addresses of the storage unit 7; As reading means, a clock generator 10 that generates a clock signal of a constant period and a counter 8 that counts the clock signals are added.

[Effect]

The register 9 specifies a desired pattern signal from among the pattern signals having a plurality of wavelength changes stored in advance at the upper address of the storage section (ROM) 7 using a pattern selection data bus inputted from the outside.

Further, the counter 8 counts the clock signal of a constant period outputted from the clock signal generator 10, and outputs the count signal to the lower address of the storage unit 7 at every predetermined count, and outputs the count signal to the register 9 stored in the lower address. The resistance value signals corresponding to the waveforms specified by are sequentially read out and output to the control unit 6.

The control unit 6 switches the changeover switches (4-1 to 4-n) in response to the resistance value signals inputted in time series to change the wavelength of the RC oscillator in time series to create the same waveform as the designated waveform. oscillate a signal.

In the present invention, by changing the oscillation wavelength of the RC oscillator in accordance with a pattern signal having a desired wavelength change stored in the storage section 7 in advance, it is possible to oscillate the same pattern signal as the desired pattern signal. can.

〔Example〕

FIG. 1 is a block diagram of a programmable variable oscillator according to an embodiment of the present invention, and FIG. 2 is a signal waveform diagram for explaining the operation of the embodiment.

In FIG. 1, the programmable variable oscillator of the embodiment includes an oscillator 1 using a CMO3 IC, a capacitor 2 and a variable resistor 3, and a changeover switch 4 for each variable resistor 3.
A control unit that controls switching of the changeover switches 4-1 to 4-n in an RC oscillation circuit using a feedback circuit configured with resistors 5-1 to 5-n connected via resistors 1 to 4-n. 6
have.

Further, the RC oscillator is provided with a storage section (ROM) 7 that stores pattern signals having a plurality of wavelength changes required in advance at upper addresses and resistance value signals of each pattern signal at lower addresses, and a storage section. A register 9 specifies a desired pattern signal from among a plurality of pattern signals stored in upper addresses of 7, and resistance value signals of specified patterns stored in lower addresses corresponding to the specified pattern are read out in time series. As means, a clock generator 10 that generates a clock signal of a constant period and a counter 8 that counts the clock signals are added.

The operation will be explained with reference to the signal waveform diagram in FIG.

A pattern selection data bus is input to register 9 from the outside. The register 9 selects a pattern having a wavelength change such as that shown in FIG. specify.

On the other hand, the counter 8 counts the clock signal of a constant period output from the clock signal generator 10, and
A count signal is output to the lower address of the storage unit 7 every tn, and as shown in FIG. 2, the resistance value signals R1 to Rn of the designated pattern stored in the lower address are
are sequentially read out and output to the control section 6.

The control unit 6 changes the changeover switch in response to the resistance value signals R1 to Rn inputted in time series to change the combination of the resistors 5-1 to 5-n.

By switching the resistance of this changeover switch, the oscillation wavelength of the RC oscillator changes in a time-series manner and oscillates, oscillating a signal having the same waveform as the specified pattern signal.

〔Effect of the invention〕

As explained above, according to the present invention, a pattern signal having a desired wavelength change can be obtained with a simple configuration using an RC oscillator.

[Brief explanation of drawings]

FIG. 1 is a connection diagram of a programmable variable wavelength oscillator according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram for explaining the operation of the embodiment, and FIG. 3 is a connection diagram of an RC oscillator. In the figure, 1 is an oscillation circuit, 2 is a capacitor, 3 is a variable resistor,
4-1 to 4-n are changeover switches, 5-1 to 5-n are resistors, 6 is a control section, 7 is a storage section, 8 is a counter, 9 is a register, and 1o is a clock signal generator. RC launch (close reading m Figure 3 Megoi (Ishirime 17 υfys Miaki Cano F-P to 4
? ;E45 and Ega Sugi Riko Figure 2

Claims (1)

[Claims] It is composed of a capacitor (2), a plurality of resistors (5-1 to 5-n), and a changeover switch (4-1 to 4-n) that switches each of the resistors, and oscillates a variable wavelength by switching each of the resistors. The RC oscillator includes a storage section (7) for storing a resistance value signal corresponding to a desired waveform in advance, a readout means (8, 10) for reading out the resistance value signal stored in the storage section (7), and the readout section. a control unit (6
) A programmable variable wavelength oscillator comprising: