JPS6079805A - Method for adjusting oscillation frequency in voltage controlled oscillator - Google Patents

Abstract

PURPOSE:To attain stable trimming by forming the oscillator that a laser is used to trim stepwise a strip form adjusting pattern formed on a board so as to obtain a desired initial oscillation frequency. CONSTITUTION:A voltage controlled oscillator 5 whose initial oscillation frequency is to be set is placed to a predetermined prescribed position. A set initial oscillation frequency F0 of the oscillator 5 is measured by using a measuring instrument 2. When the measured result is obtained, a control section 7 compares it with a specified value Fc of the predetermined desired initial oscillation frequency, calculates the difference DELTAf and also compares the calculated difference DELTAf with the preset 1st reference value, in other words, a coarse adjusting amount f1. In case of DELTAf>f1, the control section 7 gives a control instruction to a laser device 6 so as to allow the device 6 to apply coarse adjusting trimming to a trimming part for coarse adjustment, i.e., at a part on an adjusting pattern 5-1. Then the laser device 6 irradiates laser so as to trim a prescribed position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a method for adjusting an oscillation frequency in a voltage controlled oscillator.

(Prior Art) FIG. 1 shows a method of adjusting the oscillation frequency in a conventional voltage controlled oscillator. In FIG. 1, 1 is a voltage controlled oscillator configured by mounting electronic components (not shown) on a board;
No. 1 is an oscillation frequency adjustment pattern formed on the substrate constituting the voltage controlled oscillator 1 (hereinafter simply referred to as adjustment pattern); 2 is a device for measuring the oscillation frequency of the voltage controlled oscillator 1 (hereinafter referred to as adjustment pattern); 3 is a grinder.

In general, the initial oscillation frequency of this type of voltage controlled oscillator depends on the width and thickness of the pattern formed on the substrate constituting the voltage controlled oscillator, as well as the manufacturing or components of electronic components to be mounted, such as capacitors, transistors, and resistors. It is known that it fluctuates due to the variation in
In a voltage controlled oscillator in the 0 MHz band, the frequency may be so large as to exceed 50 MHz. On the other hand, the standard for the initial oscillation frequency required for voltage controlled oscillators is extremely strict, and may be set within ±] MHz, for example. Therefore, in this type of voltage controlled oscillator, the process of adjusting the oscillation frequency is essential.

The oscillation frequency of the lightning-controlled oscillator is basically determined by the following formula.

However, fo is the oscillation frequency, π is the circular index, L is the inductance, and C is the capacitance. Therefore, the adjustment of the oscillation frequency Rfo is to adjust the inductance L to j! It is known that this can be achieved by adding iHj and reducing the oscillation frequency fO, and that the pattern on the substrate constituting the voltage controlled oscillator can be trimmed to have a green width using a trimming method.

Next, adjustment of the oscillation frequency in a conventional voltage controlled oscillator will be explained using FIG. The conventional oscillation frequency adjustment shown in FIG. 1 is a trimming method, in which an operator operates a grinder 3 to trim an adjustment pattern 1-1, which is a f-line formed on a substrate, to obtain a desired result. The oscillation frequency is obtained. At this time, the operator operates the grinder 3 while monitoring the value of the oscillation frequency displayed on the measuring device 2, and gradually trims the adjustment pattern 1-1 many times.

FIG. 2 is a partially enlarged view of the adjustment pattern 1-1 partially trimmed by the above operation, and in the figure, 1-2 indicates the portion trimmed by the grinder 3.

As described above, the adjustment of the oscillation frequency according to the prior art is performed manually using mechanical means such as a grinder.
Therefore, it is difficult to perform accurate trimming, and much of it depends on the experience and intuition of the operator. For these reasons, (1)) IJ drilling requires skill.

(2) Since it depends on people, it requires a lot of man-hours and is not suitable for mass production.

(3) Because it depends on people, it cannot be stabilized or trimmed.

(4) It is necessary to remove pattern chips by trimming.

(5) During the trimming process, high vibrations and shocks are applied to the board, which adversely affects other parts.

There were many problems such as.

(Object of the Invention) The present invention has been developed in consideration of the above-mentioned points, and is capable of stable trimming and stable electrical characteristics.
Moreover, it is aimed at realizing adjustment of the emission frequency that can be performed automatically at low cost.

(Structure of the Invention) That is, in this type of voltage controlled oscillator, a strip-shaped adjustment pattern formed on a substrate is trimmed in stages using a laser to obtain a desired initial oscillation frequency. Thus, the above-mentioned purpose can be achieved.

The present invention will be explained below using the drawings.

(Embodiment of the Invention) FIG. 3 is a diagram illustrating an oscillation frequency adjustment method according to the present invention. In FIG. 3, 2 is a measuring device for measuring the oscillation frequency as in FIG. 1, 5 is a voltage controlled oscillator configured by mounting electronic components (not shown) on a board,
-1 is a pattern for adjusting the oscillation frequency of the voltage controlled oscillator 5 (hereinafter simply referred to as an adjustment main turn). 6
7 is a laser device that creates and emits a laser beam for trimming the turn in order to obtain a desired oscillation frequency, and 7 is a control unit that controls the entire system according to a predetermined procedure.

Next, a method for adjusting the oscillation frequency according to the present invention will be explained. First, the voltage controlled oscillator 5 whose initial oscillation frequency is to be set is set at a predetermined position. After this, the initial oscillation frequency Fo of the voltage controlled oscillator 5 that has been set is
is measured using measuring device 2. When the result of this measurement is obtained, the control unit 7 calculates the difference Δf between the desired initial emission values set in advance, and also sets the calculated difference Δf to the first reference value set in advance, in other words. , the coarse adjustment amount f + s which is set in advance, for example i
'j: ] Compare the size with OMHz. If the difference Δf calculated by the control unit 7 is larger than the rough adjustment amount f1, a control command is sent to the laser device 6, and the trimming point for rough adjustment, that is, the adjustment turn 5-1 is adjusted in advance. Commands coarse trimming of a determined unit area. As a result, the laser device 6 emits a laser and trims a predetermined location, but at this time, it does not contact the laser device 6 adjustment/e-turf 5-1, and is free from vibrations and It's not shocking. Next, the oscillation frequency FO' after trimming by the laser is measured, the difference Δf from the standard value FC is determined, and the magnitude thereof is compared with the coarse adjustment amount f1. Thereafter, the above operation is repeated until the difference Δf becomes smaller than the rough adjustment Mf+. Then, when the difference Δf is smaller than the 'Mi adjustment amount f1, or becomes smaller due to repetition of the above operation, the control section 7 sends a control command to the laser device 6 to adjust the trimming position for fine adjustment.
In other words, a command is given to trim a predetermined unit area on the adjustment groove 5-1. Fine trimming is performed according to this command, but the measuring instrument 2 measures the oscillation frequency Fo'' at that time each time trimming is performed, and the control unit 7 measures the measured oscillation frequency Fo''.
A comparison is made with the standard value Fc set above. These controls are based on the standard value F of the desired initial oscillation frequency.

is repeated until satisfied.

FIG. 4 is a partially enlarged view showing an example of the adjustment pattern 5-1 whose frequency has been adjusted by the trimming,
In the figure, reference numerals 5-2 and 5-3 indicate trimmed portions, and here an example is shown in which trimming was performed on the adjustment hole and turn 5-1 soil in a grid pattern.

Figure 5 is a flowchart showing the operation and control procedure for obtaining the desired initial oscillation frequency as described above.Based on this, a program for adjusting the oscillation frequency is created and stored in advance in the control unit z. However, if the measuring instrument 2, laser device 6, and control unit 7 are linked together, and the set of voltage-controlled oscillators 5 is also controlled, a large amount of initial voltage of the voltage-controlled oscillators can be generated continuously without human intervention. It is clear that automation of wave number adjustment can be realized.

In addition, although the measuring instrument, the laser device, and the control section were treated individually in the above explanation, it is beyond the scope of the explanation to explain that the individual functions may be grouped together and configured and used as one device.

(Effects of the Invention) As explained in detail, according to the frequency adjustment method using the trimming method according to the present invention, trimming for frequency adjustment uses a laser.・Trimming can be performed without contacting the p-turn, so there is no vibration or impact, and there is no effect on other parts.Furthermore, minute adjustments can be made within a limited pattern space. Highly accurate and stable trimming can be performed without the need for experienced personnel. Furthermore, by combining and interlocking the measuring instrument, laser device, and control unit, it is possible to automatically adjust the initial oscillation frequency by automatically trimming the adjustment nozzle and measuring the oscillation frequency after trimming. The effects can be expected.

[Brief explanation of drawings]

Figure 1 is a diagram explaining the method of adjusting the oscillation frequency in a conventional voltage controlled oscillator, Figure 2 is a partially enlarged view of the adjustment groove, and Figure 3 is a diagram explaining the method of adjusting the oscillation frequency according to the present invention. Figure 4 is a partially enlarged view of the adjustment gear.
FIG. 5 is a chart showing the flow of the oscillation frequency adjustment method according to the present invention. 1.5 is a voltage controlled oscillator, 1-1.5-1 is an adjustment turn, 2 is a measuring device, 3 is a grinder, 6 is a laser device, and 7 is a control section. Patent Applicant: Oki Electric Industry Co., Ltd. Figure 5 Procedural Amendment (Toge) ] Case Indication 1982 Patent Application No. 185914 2 Name of Invention Method for Adjusting Oscillation Frequency in a Voltage Controlled Oscillator 3 Person Making the Amendment Related Patent Applicant Office (105) 1-7-12 Toranomon, Minato-ku, Tokyo
Name (029), 5 Chuo Electric Industry Co., Ltd. Representative Director and President Nankai Hashimoto 4 Agent Address (105) 1-7-12 Toranomon, Minato-ku, Tokyo
No. 5 Subject of amendment: “Claims” column in the specification,
``Detailed Description of the Invention'' column and curved surface ``No. 5, Figure'' ° Supplement? )MV,,,paper. 66 Amendment (1) The column "Claims" in the specification shall be amended as a separate sheet. (2) In the same book, page 9, line 15, the phrase "within the pattern space" is corrected to "within the pattern space." (3) Revise the drawing “Figure 5” as attached. Attachment 2 A standard value with a tolerance of the desired initial oscillation frequency and a standard value indicating the coarse adjustment amount of the patent claim are set, and the value of the oscillation frequency that has been completed by 1jll after assembly is the standard value. If the difference is greater than the reference value, the area for rough adjustment is trimmed until the value is equal to or less than the reference value, and then, by the measurement after the bird blowfish. If the value of the oscillation frequency is below the standard value, it will be compared with the standard value and the difference will be within the allowable range of the standard value. An oscillation frequency adjustment method in a voltage controlled oscillator, characterized in that a desired initial oscillation frequency is obtained by trimming the oscillation frequency.

Claims (1)

[Claims] A standard value with a tolerance for the desired initial oscillation frequency and a standard value indicating the rough adjustment level are set, and when the oscillation frequency value measured after assembly is compared with the standard value, the difference is greater than or equal to the standard value. In this case, trim the rough adjustment point on the iE turn until the value is below the reference value, and then if the measurement after trimming shows that the oscillation frequency value is below the reference value, then , compare with the standard value,
A method for adjusting an oscillation frequency in voltage-controlled oscillation, characterized in that a desired initial oscillation frequency is obtained by trimming a fine adjustment portion on a pattern with an ox so that the difference is within an allowable range of the standard value.