JPH0547410Y2 - - Google Patents
Info
- Publication number
- JPH0547410Y2 JPH0547410Y2 JP7566288U JP7566288U JPH0547410Y2 JP H0547410 Y2 JPH0547410 Y2 JP H0547410Y2 JP 7566288 U JP7566288 U JP 7566288U JP 7566288 U JP7566288 U JP 7566288U JP H0547410 Y2 JPH0547410 Y2 JP H0547410Y2
- Authority
- JP
- Japan
- Prior art keywords
- voltage dividing
- voltage
- dividing resistor
- resistor element
- input terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000010586 diagram Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Landscapes
- Measurement Of Current Or Voltage (AREA)
Description
【考案の詳細な説明】
「産業上の利用分野」
この考案は半導体集積回路試験装置における被
試験IC素子の出力を基準レベルと比較する比較
回路に関する。[Detailed description of the invention] "Industrial Application Field" This invention relates to a comparison circuit that compares the output of an IC element under test with a reference level in a semiconductor integrated circuit testing device.
「従来の技術」
従来のこの種の比較回路は第２図に示すように
入力端子１１、つまり被試験IC素子の出力端子
は高周波バツフア１２を通じて、抵抗素子１３，
１４よりなる分圧抵抗素子１５の一端に接続さ
れ、その分圧抵抗素子１５の分圧点は比較器１６
の一方の入力端に接続される。入力端子１１の基
準電位点１７は電圧ホロワ１８に接続され、電圧
ホロワ１８の出力側は基準電源１９を通じて比較
器１６の他方の入力側に接続される。基準電位点
１７は電圧ホロワ２１を通じて分圧抵抗素子１５
の他端に接続される。``Prior Art'' As shown in FIG. 2, in a conventional comparison circuit of this type, an input terminal 11, that is, an output terminal of an IC element under test, is connected to a resistive element 13 through a high frequency buffer 12.
The voltage dividing point of the voltage dividing resistor 15 is connected to one end of the voltage dividing resistor 15 consisting of the comparator 16.
is connected to one input end of the A reference potential point 17 of the input terminal 11 is connected to a voltage follower 18 , the output of which is connected to the other input of the comparator 16 via a reference power supply 19 . The reference potential point 17 is connected to the voltage dividing resistor element 15 through the voltage follower 21.
connected to the other end.
このようにして基準電位点１７を比較器１６の
位置にもつて来ているが、電圧ホロワ２１の出力
インピーダンスが高周波では大きくなるため、コ
ンデンサ２２を接続してインピーダンスを下げて
いるが、このために高周波領域では電圧ホロワ２
１がない場合と同様になつて、雑音２３の影響が
出て来る。 In this way, the reference potential point 17 is brought to the position of the comparator 16, but since the output impedance of the voltage follower 21 becomes large at high frequencies, a capacitor 22 is connected to lower the impedance. In the high frequency region, voltage follower 2
The effect of the noise 23 appears in the same way as when there is no 1.
「課題を解決するための手段」
この考案によれば入力端子は高周波バツフアを
通じて第１分圧抵抗素子の一端に接続され、その
第１分圧抵抗素子の分圧点が比較器の一方の入力
端に接続される。入力端子の基準電位点が第１分
圧抵抗素子の他端に接続され、また電圧ホロワに
接続される。その電圧ホロワの出力側は基準電源
を通じて第２分圧抵抗素子の一端に接続され、そ
の第２分圧抵抗素子の他端は第１分圧抵抗素子の
他端に接続され、第２分圧抵抗素子の分圧点は比
較器の他方の入力端に接続される。第１、第２分
圧抵抗素子の分圧比は互に等しく選定される。"Means for Solving the Problem" According to this invention, the input terminal is connected to one end of the first voltage dividing resistor element through a high frequency buffer, and the voltage dividing point of the first voltage dividing resistor element is connected to one input of the comparator. connected to the end. A reference potential point of the input terminal is connected to the other end of the first voltage dividing resistor element, and is also connected to the voltage follower. The output side of the voltage follower is connected to one end of the second voltage dividing resistor element through the reference power supply, the other end of the second voltage dividing resistor element is connected to the other end of the first voltage dividing resistor element, and the second voltage dividing resistor element is connected to the other end of the second voltage dividing resistor element. The voltage dividing point of the resistive element is connected to the other input terminal of the comparator. The voltage dividing ratios of the first and second voltage dividing resistive elements are selected to be equal to each other.
「実施例」
第１図はこの考案の実施例を示し、第２図と対
応する部分には同一符号を付けてある。この考案
においては分圧抵抗素子１５の他端は基準電位点
１７に接続され、また電圧ホロワ１８の出力側は
基準電源１９を通じて、抵抗素子３１，３２より
なる分圧抵抗素子３３の一端に接続され、分圧抵
抗素子３３の他端は分圧抵抗素子１５の他端に接
続され、分圧抵抗素子３３の分圧点は必要に応じ
て電圧ホロワ３４を通じて比較器１６の他方の入
力端に接続される。"Embodiment" FIG. 1 shows an embodiment of this invention, and parts corresponding to those in FIG. 2 are given the same reference numerals. In this device, the other end of the voltage divider resistor 15 is connected to a reference potential point 17, and the output side of the voltage follower 18 is connected to one end of a voltage divider resistor 33 made up of resistors 31 and 32 through a reference power supply 19. The other end of the voltage dividing resistor element 33 is connected to the other end of the voltage dividing resistor element 15, and the voltage dividing point of the voltage dividing resistor element 33 is connected to the other input terminal of the comparator 16 through a voltage follower 34 as necessary. Connected.
入力端子１１の電圧をVi、基準電源１９の電
圧をVi、抵抗素子１３，１４，３１，３２の各
抵抗値をR1，R2，R3，R4、雑音２３をＥとする
と、分圧抵抗素子１５の分圧出力V3、電圧ホロ
ワ３４の出力V4はそれぞれ次式となる。 If the voltage of the input terminal 11 is Vi, the voltage of the reference power supply 19 is Vi, the resistance values of the resistive elements 13, 14, 31, and 32 are R 1 , R 2 , R 3 , R 4 , and the noise 23 is E, then The divided voltage output V 3 of the piezoresistive element 15 and the output V 4 of the voltage follower 34 are each expressed by the following equations.
V3＝１／１＋R1／R2Vi＋１／１＋R2／R1Ｅ
V4＝１／１＋R3／R4Vi＋１／１＋R4／R3Ｅ
この考案においては分圧抵抗素子１５の分圧比
R1／R2、分圧抵抗素子３３の分圧比R3／R4は互
に等しく選定されている。従つて雑音Ｅにより電
圧V3が上昇すると、その上昇と同一量だけ電圧
V4も上昇し、これらは比較器１６で互に打消さ
れる。なお電圧ホロワ３４は直流的なインピーダ
ンスを下げるためのものであり、必要に応じて省
略してもよい。 V 3 =1/1+R 1 /R 2 Vi+1/1+R 2 /R 1 E V 4 =1/1+R 3 /R 4 Vi+1/1+R 4 /R 3 E In this invention, the voltage dividing ratio of the voltage dividing resistor element 15
R 1 /R 2 and the voltage dividing ratio R 3 /R 4 of the voltage dividing resistance element 33 are selected to be equal to each other. Therefore, when the voltage V 3 increases due to noise E, the voltage increases by the same amount as the increase.
V 4 also rises and these cancel each other out in comparator 16. Note that the voltage follower 34 is for lowering DC impedance, and may be omitted if necessary.
「考案の効果」
以上述べたようにこの考案によれば、雑音によ
る影響は比較器の入力側において互に打消されて
現われない。"Effects of the Invention" As described above, according to this invention, the effects of noise are canceled out on the input side of the comparator and do not appear.
第１図はこの考案の実施例を示す接続図、第２
図は従来の比較回路を示す接続図である。
Figure 1 is a connection diagram showing an embodiment of this invention, Figure 2
The figure is a connection diagram showing a conventional comparison circuit.
Claims (1)
抗素子の一端に接続され、 その第１分圧抵抗素子の分圧点が比較器の一方
の入力端に接続され、 上記入力端子の基準電位点が上記第１分圧抵抗
素子の他端に接続され、 上記入力端子の基準電位点が電圧ホロワに接続
され、 その電圧ホロワの出力側は基準電源を通じて第
２分圧抵抗素子の一端に接続され、 その第２分圧抵抗素子の他端は上記第１分圧抵
抗素子の他端に接続され、 上記第２分圧抵抗素子の分圧点が上記比較器の
他方の入力端に接続され、 上記第１、第２分圧抵抗素子の各分圧比は互に
等しく選定されている比較回路。[Claims for Utility Model Registration] The input terminal is connected to one end of a first voltage dividing resistor element through a high frequency buffer, the voltage dividing point of the first voltage dividing resistor element is connected to one input end of a comparator, and the above A reference potential point of the input terminal is connected to the other end of the first voltage dividing resistor element, a reference potential point of the input terminal is connected to a voltage follower, and the output side of the voltage follower is connected to a second voltage dividing resistor through a reference power supply. the other end of the second voltage dividing resistor element is connected to the other end of the first voltage dividing resistor element, and the voltage dividing point of the second voltage dividing resistor element is connected to the other end of the comparator. A comparator circuit connected to an input terminal, wherein the voltage dividing ratios of the first and second voltage dividing resistive elements are selected to be equal to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7566288U JPH0547410Y2 (en) | 1988-06-06 | 1988-06-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7566288U JPH0547410Y2 (en) | 1988-06-06 | 1988-06-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01179276U JPH01179276U (en) | 1989-12-22 |
| JPH0547410Y2 true JPH0547410Y2 (en) | 1993-12-14 |
Family
ID=31300721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7566288U Expired - Lifetime JPH0547410Y2 (en) | 1988-06-06 | 1988-06-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0547410Y2 (en) |
-
1988
- 1988-06-06 JP JP7566288U patent/JPH0547410Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01179276U (en) | 1989-12-22 |
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