JPS6132536A - Adjusting process of hybrid integrated circuit - Google Patents

Abstract

PURPOSE:To reduce the member of outer terminals exclusively for adjustment by a method wherein a contact to be measured and an outer terminal taking no part in a circuit operation in adjustment are preliminarily connected to each other by a conductive connecting member such as a resistor or a conductor to be disconnected after finishing the adjustment so that the outer terminal may be utilized for normal circuit operation. CONSTITUTION:A contact N to be measured and an output terminal 6 are connected to each other by a resistor R2 while no signal is transmitted to an input terminal 2 and then the DC voltage of output terminal 6 (i.e. the voltage of contact N) and that of outer terminals 3, 4 are measured to adjust resistors RT1- RT4 by means of laser trimming process. After finishing this adjustment, the resistor R2 is disconnected by laser beams etc. so that the output terminals 6 may be utilized for normal circuit operation.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a method for adjusting a hybrid integrated circuit device.

[Background of the invention]

Hybrid integrated circuit devices are busy with inspection processes, etc., and are tested to see if their functions, electrical characteristics, etc. satisfy specifications, and if they do not meet specifications, adjustments are made. When it comes to hybrid integrated circuits, the number of test items increases as the functionality increases, so testing is required.

There is a need to simplify testing procedures and methods without reducing accuracy.

However, in the past, a method has been adopted in which external terminals and wiring exclusively for testing have been provided in advance to the hybrid integrated circuit device for the purpose of facilitating inspection, but this method is not preferred as it increases the size and cost of the hybrid integrated circuit device. isn't it.

An example of a conventional adjustment method for such a hybrid integrated circuit device will be described below based on a hybrid integrated circuit device having a specific circuit configuration.

FIG. 1 is a circuit diagram of a hybrid integrated circuit device adjusted by a conventional adjustment method, in which 1 is a hybrid integrated circuit device constituting an amplifier with a built-in limiter circuit, 2 is an input terminal, and 3.
4 is an external terminal, 5 is a power supply terminal, 6 is an output terminal, AMPL
, AMP2 is an amplifier circuit, C1, C2 are internal capacitors, C51c4 is an external capacitor, Q+ is an NPN transistor, Qz is a PNP transistor, R1 is a resistor, RTl, RT2, RT3, RT4 are adjustment resistors. It is.

In this hybrid integrated circuit device, when a signal having a predetermined amplitude or more is supplied to input terminal 1, transistor Q1. Q* and the resistors RT1 to RT44C detect and output the clipped signal to the output terminal 6.

That is, when a signal with a predetermined amplitude or more shown in FIG. 2 is supplied, the upper level is amplitude limited by the base terminal voltage of transistor Q2 and its base-emitter voltage, and Since the amplitude of the lower level is limited by the voltage between the two, a signal having a clipped waveform shown in FIG. 3 is outputted to the output terminal 6.

Note that the upper voltage level v1 changes the voltage division ratio of the resistors RT3 and RT4, and the lower voltage level Vz changes the voltage division ratio of the resistors RT1 and RT4.
By changing the voltage division ratio of transistor Q1. Adjustment can be made by changing the base terminal voltage of Q2.

Next, in the hybrid integrated circuit device having such a configuration, both the upper and lower voltage levels V1*V2 are set to the same voltage V
The adjustment method when setting OK will be explained.

As an example of a conventional adjustment method, a large amplitude sine wave signal is supplied to the input terminal 1, the vertical symmetry of the output signal obtained from the output terminal 6 is measured, and the resistances of the resistors RT1 to RT4 are adjusted by laser trimming as appropriate. There are ways to adjust values and set voltage levels.

However, this method requires a measuring device that can measure the output signal at high speed.

As a result, the measuring device becomes expensive, leading to an increase in the price of the hybrid integrated circuit device, and in the case of high-frequency signals, the adjustment accuracy decreases depending on the performance of the measuring device.

Next, an example of a conventional adjustment method that eliminates the problems of the above adjustment method will be described.

In FIG. 1, the voltage at external terminal 3 (i.e., the voltage at the base terminal of transistor Q1) is set to VSS, and the voltage at external terminal 4 (i.e., the base terminal voltage of transistor Q2) is set to VSS.
4. Transistor Qs, (connection point N of emitter terminal of b
voltage of VN%) transistor Q1. Base φ of Q2
If the emitter voltage is Vni+ (0.7 V), the upper voltage level V and the lower voltage level V2 are expressed by the following equation.

Vs= (V4 + VBI) VN...
・・・・・・・・・・・・(1)■! = VN − (Vs
-VBB)...---(2)The relationship of the above formula 0) can be shown in the characteristic diagram shown in Figure 4, and the above formula (
The relationship 2) can be shown in the characteristic diagram shown in FIG.

Based on the button explanation above, measure the voltage at external terminal 6.4 and the voltage at connection point N, and use the above relational expressions (1) and (2).
Using , the voltage level v, t V, is the busy voltage V.

The resistors RTi to RT4 can be adjusted by laser trimming so that According to this method, since adjustment can be performed by measuring the DC voltage, highly accurate adjustment is easy and the measuring device is also inexpensive.

However, in order to implement this adjustment method, in advance,
Since it is necessary to provide an external terminal for measurement connected to the connection point N and extend the external terminal to measure the voltage at the connection point N, the hybrid integrated circuit device becomes large and
This was uneconomical because it required external terminals that were only used for measurements.

[Purpose of the invention]

An object of the present invention is to provide a method for adjusting a hybrid integrated circuit that allows the number of external terminals for measurement to be reduced.

[Summary of the invention]

In order to achieve the object, the present invention includes a contact point to be measured;
When making adjustments, connect external terminals that do not have any influence on circuit operation.
Connect in advance with a conductive connecting member such as a resistor or conductor, adjust by measuring the contact point via the external terminal, and after the adjustment is completed, disconnect the connecting member,
The present invention is characterized in that the external terminal is used for normal circuit operation.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 is a circuit diagram for explaining an embodiment of the method for adjusting a hybrid integrated circuit device according to the present invention, in which R2 is a resistor, and parts corresponding to those in FIG. 1 are given the same reference numerals. ing.

In this embodiment, during adjustment, the output terminal 6 is not used because it is not involved in the circuit operation, so the contact N to be measured and the output terminal 6 are connected through a resistor 82, and the measurement of the contact N is performed using the output terminal 6. ``That's how it is.''

As explained in the conventional example (Fig. 1), no signal is supplied to input terminal 2, and the DC voltage at output terminal 6 (that is, the voltage at contact N) and the DC voltage at external terminals 3 and 4 are measured. , the above equation θ), (2), the resistors RT1 to RT4 are adjusted by laser trimming so as to set the upper and lower levels VB + V2 for clipping at a predetermined voltage amplitude.

When this adjustment is completed, the resistor R2 is cut by a laser or the like, so that the output terminal 6 can be used for normal circuit operation.

Figures 7 and 8 show the resistor R2 used in this example.
The wiring pattern shown in FIG. 6 is shown, and parts corresponding to those in FIG.

In FIG. 7, the contact N to be measured and the output terminal 6 are connected through a resistor R2, and the voltage at the contact N can be measured by the output terminal 6. Figure 8 shows the adjustment completed ridge resistor R.
2 is disconnected, and the output terminal 6 is the amplifier circuit AMP.
The signal from 2 will be output.

In this example, it is only necessary to adjust the DC voltage, and the circuit can be adjusted with high precision using a simple measuring means. External terminals can be used.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to reduce the number of external terminals dedicated to adjustment and perform highly accurate circuit adjustment without requiring complicated and expensive adjustment means. A hybrid integrated circuit can be obtained.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing a hybrid integrated circuit device according to the conventional adjustment method, Figure 2' is a waveform diagram of the input signal, Figure 3 is a waveform diagram showing the characteristics of the output signal, and Figures 4 and 5. 6 is a characteristic diagram showing the characteristics of the clip voltage level, FIG. 6 is a circuit diagram showing a hybrid integrated circuit device according to an embodiment of the method for adjusting the amount of hybrid integrated circuit according to the present invention, and FIG. FIG. 8 is a plan view showing the wiring pattern of the hybrid integrated circuit device of FIG. 6 after adjustment. 3.4...External terminal, 6...Output terminal, N...
・Contact, R2...Resistor. 1. Illustration 2. Figure 3. Atsushi. Figure 5. V+v3.

Claims (1)

[Claims] 1. During adjustment, a conductive connecting member is provided to connect an external terminal that is not involved in circuit operation and a contact to be measured during adjustment, and the external terminal measures the voltage of the contact to perform adjustment. A method for adjusting a hybrid integrated circuit device, characterized in that by cutting the connecting member, an external terminal for measurement is no longer necessary.