JPS5910618B2 - oscillation circuit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention utilizes all variable elements that vary the voltage or current according to the amount of displacement by displacing them in either positive or negative directions from a neutral position, and The present invention relates to a novel oscillation circuit that changes the oscillation frequency accordingly and detects and outputs the direction of displacement.

Conventionally, the frequency division number of a variable division divider in a frequency synthesizer using a phase-locked loop has generally been changed by operating a switch provided for each digit. As the number of digits increases, the structure becomes more complex and operation becomes difficult.

The present invention has been made in view of the above-mentioned drawbacks of the conventional art, and has the functions of varying the oscillation frequency and outputting a detection signal in either the positive or negative displacement direction of the knob by operating one knob. For example, by connecting to a variable frequency divider of a phase-locked loop via an up-down counter, the frequency division number can be easily changed with a simple configuration, which not only eliminates the above conventional drawbacks but also can be used in a wide range of applications. The purpose of this invention is to provide an oscillation circuit that can be used.

Hereinafter, embodiments of the present invention will be explained in detail based on the drawings.

In FIG. 1, numeral 1 indicates a variable element, for example a variable resistor, and a reference voltage E is applied to its output sides 0 and 0' through resistors Rl and R2'Th of the same resistance value, respectively, and the neutral position The voltage or current is varied by partial displacement in both positive and negative directions (for example, if the downward direction is fully positive, the upward direction is negative) from the base point.

2 is a comparison circuit having an arbitrary threshold value STh as shown in FIG. 2, and is provided with two comparators CP1 and CP2 for comparison with respect to displacements in positive and negative directions, and one side input of each of these comparators cpi and CP2 The threshold value setting power supply VR is applied to the terminal, and the output sides 0 and 0' of the variable element 1 are connected to the input terminals of the two comparators CP1 and CP2, respectively. OR1 whose output terminal is the first OR gate
When the voltage due to the displacement of variable element 1 in either the positive or negative direction exceeds the threshold voltage of the threshold setting power supply VR, the first
An OR gate OR1 power/Rano/I level signal is output.

3 is a voltage controlled oscillation circuit, in which the output terminal of the first OR gate OR1 and the output terminal of the voltage controlled oscillation integrated circuit VCI are connected to both terminals of the first AND gate A1. When the blank level signal is input, it becomes operational and the output signal of the integrated circuit VCI is output.

Note that C indicates a timing capacitor.

4 is a signal amount detection circuit, and both output sides of variable element 1 are 0,
0' is input to the fourth input terminal of the operational amplifier OPO through the diodes D1 and D2 and the third resistor R3, respectively. The signal is amplified by a gain determined by the fifth resistors R4 and R5 and output.

Note that C' in the figure represents a capacitor inserted and connected between the connection point of each cathode of both diodes DI and D2 and the ground.

5 is a direction detection circuit, in which the output terminal of the first OR gate OR1 is connected to the input terminal of each one of the two AND gates A2 and A3 arranged in parallel, and the output terminal of the first OR gate OR1 is connected to the input terminal of each of the two AND gates A2 and A3 arranged in parallel; Both output sides of the variable element 1 are connected to the human power terminal, and when the voltage on the output side O or 0' of some t due to displacement of the variable element 1 in either direction exceeds the threshold voltage. When the output first OR gate OR10 level signal is manually applied to both AND gates A2 and A3, the output side 0 or O where a voltage higher than the threshold is generated is output.
A no-level signal is output only from whichever AND game A2 or A3 is connected to the gate A2 or A3.

Since the second AND gate A2 is directly connected and the third AND gate A3 is connected to both input terminals of the second OR gate OR2 via the inverter INV, a high level signal is output from the second AND gate A2. When the signal is output, a high level signal is output from the second OR game OR2, and on the other hand, when a NO/Y level signal is output from the third AND game A3, a low level signal is output from the second OR game OR2. When low level signals are output from both AND games A2 and A3, a high level signal is output from the second OR game OR2.

7 is an up-down counter, and the clock input terminal C
K is connected to the output terminal of the first AND gate A1, and the up/down control terminal UDC is connected to the second OR gate OR2, and when a high level signal is input to the amplifier down 4u control terminal UDC, it is input to the clock input terminal CK. When a low level signal is input, it counts down and outputs a count value when a low level signal is input.
This output side is connected, for example, to a variable splitter (not shown) of a phase-locked loop in a frequency synthesizer.

To explain the case where the oscillation circuit of the embodiment having the above configuration is used as a means for varying the frequency division number of a variable frequency divider in a frequency synthesizer using a phase-locked loop, the variable element 1 is now at the midpoint position. Since the output signal of the comparator circuit 2 is at low level, no clock signal is input from the voltage controlled oscillation circuit 3 to the up-down counter 1.
At this time, the up-down counter 7 is in up-count mode with a high-level signal input to its up-down control terminal UDC, but does not perform a counting operation because the clock signal to be counted is not input manually.

Therefore, the number of divisions of the variable division divider does not change either.

This state occurs not only when the variable element 1 is at the center position, but also when the displacement part of the variable element 1 is displaced from its neutral position in the positive or negative direction, the amount of displacement is relatively small and the variable element 1 is When the output of either output side 0 or O' is less than the threshold value S of the next-stage comparison circuit 2, the voltage controlled oscillation circuit 3 also maintains the off state as described above.

That is, when the displacement part is operated near the neutral position of the variable element 1, there is a dead zone equal to the threshold value in the output of the comparator circuit 2 on both the positive and negative sides.

When changing the oscillation frequency of a frequency synthesizer, for example, in amateur radio equipment, 145MHz
When you want to change the frequency from
A high level signal is output from the first OR gate OR1, and this is input to one input signal of the first AND gate AI, so that the first AND gate A1 outputs the integrated circuit V.
The state in which the oscillation frequency of CI is output, that is, the voltage controlled oscillation circuit 3 is in the on state.

Then, in the direction detection circuit 5, the second AND gate A
2 becomes high level, a high level signal is input to the up/down control terminal UDC of the up/down counter 7 as shown in FIG. The total number of stations is counted up, and the number of stations of the variable divider is varied.

On the other hand, the signal amount detection circuit 4 outputs a voltage according to the variable amount as shown in FIG. Then, the oscillation frequency of the frequency synthesizer is changed from 145 MHZ at high speed by applying manual power to the clock input terminal CK of the up-down counter 7. Then, when the frequency approaches the target 148 MHz, the variable element When the displaced part 1 is returned to the vicinity of the neutral position, the output voltage of the signal amount detection circuit 4 becomes low, and the output frequency of the voltage controlled oscillation circuit 3 also becomes low, and accordingly, the oscillation frequency of the synthesizer also changes. 148MHZ because it is low speed
easily adapted to.

Moreover, when all the displacement parts of the variable element 1 are displaced to the negative side so that the voltage on the other output side O exceeds the threshold value S, the comparator circuit 2
A high level signal is output from the second comparator CP2 and the first OR gate OR1, turning on the voltage controlled oscillation circuit 3, and in the direction detection circuit 5, a high level signal is output from the third AND gate A3. By touching INV, the second OR game
A low level signal is output from R as shown in Figure 4.
1. When this low level signal is input to the up/down control terminal UDC, the up/down counter 7 counts all the clock signals from the voltage controlled oscillation circuit 3.

In this case as well, the signal amount detection circuit 4 outputs a voltage corresponding to the variable amount in the negative direction as shown in FIG. The oscillation frequency of the frequency synthesizer increases, and the oscillation frequency of the frequency synthesizer is rapidly varied to a lower frequency.

Although the above embodiment describes an example applied to changing the number of divisions of a variable splitter in a frequency synthesizer using a phase-locked loop, the application is not limited to the above embodiment and can be used in a wide range of applications, such as microcontrollers. When applied to a game machine, by moving the operating body from the center of the operating body in several directions to the left and right, the display on the display can be changed at a speed corresponding to the amount of movement according to the operating direction.

As explained above, according to the oscillation circuit of the present invention, by displacing the variable element in positive and negative directions from the neutral position, the output frequency from the voltage controlled oscillation circuit is changed according to the amount of displacement. In addition, it has an extremely remarkable effect of being able to extract a detection signal in the positive or negative direction of the displacement part of the variable element, and is particularly useful for changing the frequency division number of the variable divider in a frequency synthesizer using a phase-locked loop metal. It has great practical effects when applied.

[Brief explanation of the drawing]

The drawings show an entire embodiment of the oscillation circuit of the present invention, FIG. 1 is a wiring diagram, and FIGS. 2 to 4 are output characteristic diagrams of a comparison circuit, a signal amount detection circuit, and a direction detection circuit, respectively. 1... Variable element, 2... Comparison circuit, 3
. . . Voltage controlled oscillation circuit, 4 . . . Signal amount detection circuit, 5 . . . Direction detection circuit. 180-

Claims (1)

[Claims] 1. A comparator circuit having a threshold value is installed on the output side of a variable element to which a reference voltage is applied and which varies the voltage or current according to displacement in both positive and negative directions with the neutral position as the reference point. The human power sides of the signal amount detection circuit to be detected and the direction detection circuit to detect all positive or negative displacement directions of the element are connected respectively, and the output side of the comparison circuit is connected to the human power side of one of the voltage controlled oscillation circuits and the direction detection circuit. The output side of the signal quantity detection circuit is connected to the other input side of the detection circuit, and the output side of the signal amount detection circuit is connected to the other input side for frequency control of the voltage controlled oscillation circuit, and the comparator circuit is connected by two-part displacement of the element. When a signal exceeding a threshold value is manually applied to the comparator circuit, the voltage-controlled oscillation circuit is turned on, and the voltage-controlled oscillation circuit is turned on, regardless of the direction of partial displacement of the element output from the signal amount detection circuit. An oscillation circuit characterized in that a voltage controlled oscillation circuit is operated by a voltage signal corresponding to an amount of displacement from a neutral position, and a direction detection circuit outputs a detection signal in a positive or negative direction.