JPH0738058A - Variable electronic circuit - Google Patents

Abstract

PURPOSE:To provide a variable electronic circuit of such constitution that the adjustment can be made by voltage applied externally without using variable electronic circuit elements at trimming or individual sections when performing the adjustment of the values of the elements of an electronic circuit or the connection of circuit blocks. CONSTITUTION:A connection changing means, which has a conductor with fusing points lower than other junctions or a diode to break electric connection by the application of reverse bias, in short, a block Cq (q=1, 2,..., N-1), which controls the connection of the junction Tq+1.1 with circuit blocks Bq and Bq+1 composed of resistors and low fusing point conductors or diodes, is provided at the junction of circuit elements or circuit blocks requiring adjustment.

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable electronic circuit that requires adjustments such as changes in circuit element values and connection changes in circuit blocks.

[0002]

2. Description of the Related Art FIG. 6 is a schematic diagram of a laser trimmer disclosed in, for example, "Electronic Communication Information Handbook" (Second Edition, P.2840). In the figure, 11 is a computer for controlling the mechanism of the laser trimmer, 12 is a solid-state laser oscillator, 13 is a switch for the solid-state laser, 14 is an output beam of the solid-state laser, and 15 is an expander for enlarging the beam diameter of the output beam 14. , 16 is the laser beam expanded by the expander 15, 17a is a first mirror for reflecting the laser beam and guiding the laser beam to a predetermined position, and 17b.
is a second mirror for reflecting again the laser beam reflected by the first mirror 17a; 18a is a first angle adjustment mechanism for adjusting the reflection angle of the first mirror 17a; This is a second angle adjusting mechanism for adjusting the mirror 17b of the .

Reference numeral 19 denotes angle adjusting mechanisms 18a and 18b.
a beam positioner driver for adjusting the mirrors 17a and 17b via the second mirror 17b; Handler, 22 is a resistance element of a hybrid IC or integrated circuit as a sample, 23a is one electrode of the resistance element 22,
23b is the other electrode of the resistive element 22, 24 is a portion forming the resistance of the resistive element 22, 25a is a probe in contact with the electrode 23a for measuring the value of the resistive element,
25b is a probe also in contact with the electrode 23b;
27 is a parts handler driver for adjusting the position of the parts handler 21; 28 is a measuring instrument 26, parts handler driver 27, beam positioner 19, solid These are lines for connecting each of the laser switches 13 and the computer 11 .

[0004] Next, the operation will be described. For simplicity, let us consider the case of adjusting the resistance value of the hybrid IC. Hybrid IC for trimming parts handler 21
, and the parts handler driver 27 controls the lens 2
A 0 focus is set on the trimmed resistor element 22 portion of the hybrid IC. After setting, the probes 25a and 25b are brought into contact with the electrodes 23a and 23b of the resistance element 22, and the resistance value of the resistance element 22 is constantly measured by the measuring device 26. Then, the solid-state laser switch 13 is turned on to emit a laser beam. The resistance element 22 is irradiated to burn out the resistance pattern.

By repeating this procedure, the resistance can be adjusted to a predetermined value. These operations are performed by computer 11
can be automatically performed by inputting the resistance value to be set in the program. In the above example, the case of adjusting the resistance value was described, but the same technique can be used when changing the connection of the delay element, the capacitive element, or the circuit block.

[0006]Although different from FIG. 6, as one of the conventional techniques, instead of adjusting the resistance value by trimming, it is a common method in ordinary electronic equipment to use a variable resistor made up of individual parts. .

[0007]

In the conventional adjustment of circuit elements by trimming, the equipment is large and expensive, and in the case of an integrated circuit, the circuit pattern must be redrawn after trimming, which shortens the design period. There is a problem that it takes a long time and increases the design cost. Furthermore, when variable elements of discrete parts are used, there is a problem that the number of externally attached parts increases, resulting in an increase in the size of the circuit.

[0008] The present invention has been made to solve the above-described problems. An object of the present invention is to obtain a variable electronic circuit having a circuit configuration that can be adjusted by an externally applied voltage without using a variable electronic circuit.

[0009]

SUMMARY OF THE INVENTION A variable electronic circuit according to the present invention provides an electrical connection between circuit elements or circuit blocks requiring adjustment by applying a conductor having a melting point lower than that of other connections or by applying a reverse bias. A connection changing means having a diode for breaking the connection is provided.

[0010]

The variable electronic circuit according to the present invention burns out a conductor with a low melting point or destroys a junction of a diode with an externally applied voltage, thereby adjusting connections of circuit elements or circuit blocks inside the electronic circuit.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1 showing the first embodiment, 1 is an input terminal for inputting a high-potential power supply voltage, 2 is an input terminal for inputting a low-potential power supply voltage, and B _i (i=1, 2, . . . , N). is a circuit block, T _{1 ·j (} j=1, 2, . . . , m1) is an input terminal of the circuit block Bl,
1, 2, . . . , mp ( _p =2, 3, . . . , N)) are connections between circuit blocks B _k-1 and B _k ;
N-1) is a connecting portion T between circuit blocks _Bq and _Bq+1 , which is composed of a resistor and a low-melting-point conductor or diode.
A block controlling the connection of _q+1·l , V _k−1·l, is a control voltage (current) input terminal for controlling the l-th connection part of the connection control block C _k−1 .

In the embodiment shown in FIG. 1, for example, a predetermined voltage (current) is applied to the control voltage (current) input terminal V1 _{·1 of} the connection control block C1, and _a The circuit blocks _B1 and B2 are formed by burning out the low _- melting _- point conductor or by applying _a reverse bias to the diode from V1.1 to destroy the junction of the diode.
can be _switched from ON to OFF.

Similarly, by applying a predetermined voltage (current) to the control voltage input terminal _VK-1,l , the circuit block B
The connection _Tk,l between _{k -1} and Bk can be turned from ON to OFF. In this manner, by applying a predetermined voltage (current) to the control input terminal from the outside, any connecting portion can be switched from ON to OFF.

Next, FIG. 2 shows a second embodiment. In FIG. 2, parts with the same reference numerals as in FIG. 1 have the same functions. Figure 2
, the connection control block C _i (i=1, 2, . . . , N
−1) C _{i · j} (i = 1, 2, ..., mp
(p=1, 2, . . . N-1)) are circuit blocks B _i and B
A connection control unit connected in series to the junction T _i+1·j between _i +1 and having the configuration shown in FIG. In FIG. 3, 5 is a resistor having a resistance value of R _i·j·1 , similarly 6, 7 and 8 are resistance values of R _i·j·2 , R _{i·j· 3} and R, respectively.
A resistor with _i.j.4 , 9 is a conductor with a low melting point. again,
3B and 3C are modifications of FIG. 3A and have the same effect.

In FIGS. 2 and 3A, circuit block B
Ignoring the influence of the impedance of _i and B _i+1 , when an external voltage is applied to the power supply voltage input terminals 1 and 2, the ratio of R _i·j·1 and R _i·j·2 becomes If there is a difference in the ratio of R _i·j·3 and R _i·j·4 , current flows through the low melting point conductor 9 . When the voltage difference applied to the terminals 1 and 2 is increased, the low melting point conductor 9
When the amount of heat generated in the conductor 9 exceeds the melting point due to an increase in the current flowing through the circuit blocks B _i and B
The connection T i+ _{1 ·j} of i+1 goes from ON to OFF.

In the configurations of B and C in FIG. 3, similarly, the voltage applied to the power supply voltage terminals 1 and 2 can turn the corresponding circuit block connection portion from ON to OFF. This means that another connection control unit C _k.i.l (k.noteq.i, l.noteq.)
The same applies to j). In such a configuration,
By changing the resistance ratio shown in FIG.
2, the connection control (control from ON to OFF) of arbitrary circuit blocks can be prioritized, and the aspect of connection between circuit blocks can be controlled by the externally applied voltage.

[0017] In the above-described second embodiment, the turning ON and OFF of the connection is adjusted by the resistance ratio as shown in FIG. A similar effect can be obtained by connecting conductors in parallel, or changing the shape or composition of a low-melting-point conductor).

Next, FIG. 4 shows a third embodiment. In FIG. 4, parts with the same reference numerals as in FIG. 2 have the same functions. In FIG. 4, 3 and 4 are connection control blocks C _i (i=1,
2, . . . , N−1) and are not connected to circuit blocks B _j (j=1, 2, . . . , N).

5 shows the connection control unit C _i·l (l=1, 2, . . . mp (p=1, 2, . . . , mp) shown in FIG.
N-1)) is a circuit connection diagram showing the internal configuration, in which
Reference numeral 10 denotes a diode that causes junction breakdown by a predetermined reverse bias voltage. In FIG. 5, A is a basic configuration, and B and C are modifications thereof. In FIG. 5A, diode 10 (D
_i.l. ) is set so that the direction of the signals of the circuit blocks _B.sub.i and _{B.sub.i +1} (the direction of current flow in the case of direct current) is the forward direction, and the resistors _R.sub.i.l.1, R _i・l・2, R _i・l・3, R
The DC bias generated by the resistors R _i.l.1 to R _i.l.4 is appropriate for the diode 10 when the external voltage application terminals 3 and ₄ are connected to the power supply voltage terminals 1 and 2, respectively. Set the resistance ratio and resistance value so that a positive forward bias is obtained.

In such a configuration, the voltage applied to the external voltage application terminal 3 is set to be lower than the voltage applied to the terminal 4, and the voltage difference between the terminals 3 and 4 is gradually increased. , destroys the junction by increasing the reverse bias applied to diode 10, turning the electrical connection from ON to OFF. After the connection is turned off, the terminal 3 is connected to the terminal 1, and the terminal 4 is connected to the terminal 2.

Similarly, in the configurations of B and C in FIG. 5, the voltage applied to the external voltage application terminals 3 and 4 can turn the connection between the circuit blocks B _i and B _i+1 from ON to OFF. Also, as in the second embodiment, the above connection can be switched from ON to OFF by appropriately adjusting the ratio of the resistors forming the connection control unit Ci _·l and changing the resistance ratio for each unit. A ranking can be set.

[0022] Also, the ON to OFF state of the connection of the circuit blocks
As a method for adjusting the order of F, a plurality of diodes 10 in FIG.
The same effect as described above can be obtained by adjusting the reverse bias voltage for junction breakdown by changing the composition of .

[0023]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the connection state of circuit blocks in an electronic circuit can be adjusted by an externally applied voltage. There is an effect that a highly reliable product can be obtained against temperature, vibration, and the like.

[Brief description of the drawing]

1 is a block diagram showing a variable electronic circuit according to a first embodiment of the invention; FIG.

FIG. 2 is a block diagram showing variable electronic circuitry according to a second embodiment of the present invention;

3 is a circuit connection diagram showing details of main components in the embodiment of FIG. 2; FIG.

FIG. 4 is a block diagram illustrating variable electronic circuitry according to a third embodiment of the present invention;

5 is a circuit connection diagram showing details of the main components in the third embodiment of FIG. 4; FIG.

[Description of symbols]

1 power supply voltage application terminal 2 power supply voltage application terminal B _i (i=1, 2, . . . N) circuit block C _i (i=1, 2, . . . N−1) connection control block T _{1 ·k} (K=1, 2, . . . , m1) Input terminal T _p·q of the first circuit block (p=2, 3, .
(r=1, 2, . . . , N) Connection portion V _{j q} between circuit blocks B _p−1 and B _p (possible values of j and q are the same as above) Control voltage (current) input terminal C _{j・Connection control unit constituting q} connection control block C _j External voltage application terminal 4 External voltage application terminal 5 Resistor 6 Resistor 7 Resistor 8 Resistor 9 Low melting point conductor 10 Diode

──────────────────────────────────────────────────── ────

[Written Amendment]

[Submission date] August 23, 1991

[Procedural amendment 1]

[Name of document to be amended] Description

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction details]

[Procedural amendment 2]

[Name of document to be amended] Description

[Correction target item name] 0001

[Correction method] Change

[Correction details]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to variable electronic circuits that require adjustments such as changes in circuit element values and connection changes in circuit blocks.

[Procedural amendment 3]

[Name of document to be amended] Description

[Correction target item name] 0009

[Correction method] Change

[Correction details]

[0009]

SUMMARY OF THE INVENTION In a variable electronic circuit according to the present invention, a connection portion of a circuit element or circuit block requiring adjustment is provided with a conductor or a reverse bias that has a lower melting point than other connection portions . A connection change means is provided having a diode that cuts off the electrical connection by the application of ground .

[Procedural amendment 4]

[Name of document to be amended] Description

[Correction target item name] 0011

[Correction method] Change

[Correction details]

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1 showing the first embodiment, 1 is an input terminal for inputting a high-potential power supply voltage, 2 is an input terminal for inputting a low-potential power supply voltage, and B _i (i=1, 2, . . . , N). is a circuit block, T _{1 ·j} ( j =1, 2, . . . , m1) is an input terminal of the circuit block Bl, T _k .
1, 2, . . . , mp ( _p =2, 3, . . . , N)) are connections between circuit blocks B _k-1 and B _k ;
N-1) is a connecting portion T between circuit blocks _Bq and _Bq+1 , which is composed of a resistor and a low-melting-point conductor or diode.
A block controlling the connection of _q+1·l , V _k−1·l, is a control voltage (current) input terminal for controlling the l-th connection part of the connection control block C _k−1 .

[Procedural amendment 5]

[Name of document to be amended] Description

[Correction target item name] 0014

[Correction method] Change

[Correction details]

Next, FIG. 2 shows a second embodiment. In FIG. 2, parts with the same reference numerals as in FIG. 1 have the same functions. Figure 2
, the connection control block C _i (i=1, 2, . . . , N
−1) C _{i · j} (i=1, 2, . . . , N−
1; j = 1, 2, ..., mp (p = 1, 2, ... N-1))
is a connection control unit connected in series to the junction T _i+1·j between the circuit blocks B _i and B _i+1 and having the configuration shown in FIG. In addition, in FIG. 3, 5 is the resistance value R
6, 7 and ₈ have resistance values R _i.j.2 , R _{i.j.3 and} R i.j.4 respectively; 9 is a low melting point conductor; is. Also, B and C in FIG. 3 are modifications of A in FIG. 3 and have the same effect.

[Procedural amendment 6]

[Name of document to be amended] Description

[Correction target item name] 0016

[Correction method] Change

[Correction details]

3B and 3C, the voltage applied to the power supply voltage terminals 1 and 2 can also turn the corresponding circuit block connecting portion from ON to OFF.
This also applies to other connection control units C _k·l (k≠l) . In such a configuration, by changing the resistance ratio shown in FIG. (Control from ON to OFF) can be prioritized, and the aspect of connection between circuit blocks can be controlled by an externally applied voltage.

[Procedural amendment 7]

[Name of document to be amended] Description

[Correction target item name] 0022

[Correction method] Change

[Correction details]

[0022] Also, the ON to OFF state of the connection of the circuit blocks
As a method for adjusting the order of F, a plurality of diodes 10 in FIG.
The same effect as described above can be obtained by adjusting the reverse bias voltage for junction breakdown by changing the composition of .

[Procedural amendment 8]

[Name of document to be amended] Description

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction details]

[Brief description of the drawing]

1 is a block diagram showing a variable electronic circuit according to a first embodiment of the invention; FIG.

FIG. 2 is a block diagram showing variable electronic circuitry according to a second embodiment of the present invention;

3 is a circuit connection diagram showing details of main components in the embodiment of FIG. 2; FIG.

FIG. 4 is a block diagram showing variable electronic circuitry according to a third embodiment of the present invention;

5 is a circuit connection diagram showing details of the main components in the third embodiment of FIG. 4; FIG.

FIG. 6 is a schematic diagram of a conventional laser trimmer;

[Explanation of symbols] 1 power supply voltage application terminal 2 power supply voltage application terminal B _i (i=1, 2, . . . N) circuit block C _i (i=1, 2, . . . N−1) connection control block T _l · _k (K=1, 2, . . . , m1) Input terminal T _p · _q of the first circuit block (p=2, 3, . . . , N; q=1, 2, .
(r=1, 2, . . . , N) Circuit block B _p−1 and B
V _j · _q (possible values of _j and q are the same as above) Control voltage (current) input terminal C _j · _q Connection control unit 3 constituting connection control block C _j External voltage application terminal 4 External voltage application terminal 5 Resistor 6 Resistor 7 Resistor 8 Resistor 9 Low melting point conductor 10 Diode

[Written Amendment]

[Submission date] September 22, 1993

[Procedural amendment 1]

[Name of document to be amended] Description

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction details]

[Brief description of the drawing]

1 is a block diagram showing a variable electronic circuit according to a first embodiment of the invention; FIG.

FIG. 2 is a block diagram showing variable electronic circuitry according to a second embodiment of the present invention;

3 is a circuit connection diagram showing details of main components in the embodiment of FIG. 2; FIG.

FIG. 4 is a block diagram showing variable electronic circuitry according to a third embodiment of the present invention;

5 is a circuit connection diagram showing details of the main components in the third embodiment of FIG. 4; FIG.

FIG. 6 is a schematic diagram of a conventional laser trimmer;

[Explanation of symbols] 1 power supply voltage application terminal 2 power supply voltage application terminal B _i (i=1, 2, . . . N) circuit block C _i (i=1, 2, . . . N−1) connection control block T ₁ · _k (K=1, 2, . . . , m1) Input terminal T _p · _q of the first circuit block (p=2, 3, . . . , N; q=1, 2, .
(r=1, 2, . . . , N) Circuit blocks B _p-1 and B _p
Connection V _j・_q (possible values of j and q are the same as above) Control voltage (current) input terminal C _j・_q Connection control unit 3 that constitutes connection control block C _j External voltage application terminal 4 External Voltage application terminal 5 Resistor 6 Resistor 7 Resistor 8 Resistor 9 Low melting point conductor 10 Diode

Claims (1)

[Claims] 1. A connection changing means having a conductor having a melting point lower than that of other connections or a diode for breaking electrical connection by applying a reverse bias is provided at a connection portion of a circuit element or circuit block requiring adjustment. A variable electronic circuit characterized by: