JPS61192121A - Switch circuit for analog signal - Google Patents

Switch circuit for analog signal

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Publication number
JPS61192121A
JPS61192121A JP60030626A JP3062685A JPS61192121A JP S61192121 A JPS61192121 A JP S61192121A JP 60030626 A JP60030626 A JP 60030626A JP 3062685 A JP3062685 A JP 3062685A JP S61192121 A JPS61192121 A JP S61192121A
Authority
JP
Japan
Prior art keywords
mos
gate
signal input
switch circuit
power supply
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.)
Pending
Application number
JP60030626A
Other languages
Japanese (ja)
Inventor
Seizo Hata
畑 清三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
New Japan Radio Co Ltd
Original Assignee
New Japan Radio Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by New Japan Radio Co Ltd filed Critical New Japan Radio Co Ltd
Priority to JP60030626A priority Critical patent/JPS61192121A/en
Publication of JPS61192121A publication Critical patent/JPS61192121A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To eliminate the conductive phenomenon between a signal input terminal and a negative power supply when the title circuit is switched from OFF to ON state by disconnecting an NMOS gate of a CMOS inverter from a PMOS gate and connecting it to a control signal input terminal. CONSTITUTION:The gate G6 of an element N6 of the CMOS inverter 6 of the circuit is disconnected from the gate G6 of an element P6 and connected to the control signal input terminal 9. Through a change in the gate connection, when the switch is turned on from off-state by the input signal at the control signal input terminal 9, since the input signal from the control signal input terminal 9 is fed directly to the gate G6 of the element N6 earlier than the conductive state of the elements N1, N2, N3, the element N6 is conductive and the gate voltage to the element N7 is negative and the element N7 is turned off. Thus, the moment the switch is turned on from the off-state, the conductive state between signal output terminals 8a, 8b and the negative power supply is avoided.

Description

【発明の詳細な説明】 (産業上の利用分野〕 本発明は、C−MOSスイッチを用いてアナログ信号の
スイッチングを行なうスイッチ回路の改良に関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in a switch circuit that switches analog signals using a C-MOS switch.

(従来の技術) 従来、アナログ信号のスイッチングにQ工各種の素子が
使用されてきたが、半導体技術の発達につれて半導体素
子が使用されることが多(なり、特にC−MOSスイッ
チが盛んに使用されるようになった。C−MOSスイッ
チの特長を列記すると。
(Conventional technology) Conventionally, various types of Q-type devices have been used for analog signal switching, but as semiconductor technology develops, semiconductor devices are increasingly being used (C-MOS switches in particular are being used extensively). The features of C-MOS switches are listed below.

(1)  オン抵抗の入力信号による変動がきわめて少
ない。
(1) There is very little variation in on-resistance due to input signals.

(11)  ドライブ回路ではほとんど電力を消費しな
い。
(11) The drive circuit consumes almost no power.

輔 正負とも電源電圧と同電位までアナログ信号をスイ
ッチングできる。
Suke: Analog signals can be switched up to the same potential as the power supply voltage, both positive and negative.

Qψ 低価格になる。Qψ The price will be low.

MC−yrosを構成するN−MC8とP−MC8の相
補効果でリーク電流によるスイッチ切り替え時のスパイ
クなどが、他の方法と比べ少ない。
Due to the complementary effect of N-MC8 and P-MC8 that make up MC-yros, there are fewer spikes caused by leakage current when switching switches compared to other methods.

第3図は従来のC−MOSスイッチを用いたアナログス
イッチ回路の代表的な一例を示す回路図であり1図にお
いて1.2.3はC−MOSスイッチ、4,5.6はC
−MOSイ/バータ、7はN−MC8,8a8bはそれ
ぞれ信号入出力端、9はコントロール信号入力端である
Figure 3 is a circuit diagram showing a typical example of an analog switch circuit using conventional C-MOS switches.
-MOS i/verter, 7 is N-MC8, 8a8b are signal input/output terminals, and 9 is a control signal input terminal.

なお、以下の説明においては、各C−MOSスイッチ1
,2.3 C−MOSインバータ4,5.6の各N−M
OS,P−MOS及びN−MC87をそれぞれ図に示す
記号N) *P1+N2+Pz+Na+Pa、N4+P
41N51P5#N61P61N7を用いて示すことと
する。
In addition, in the following explanation, each C-MOS switch 1
, 2.3 each N-M of C-MOS inverter 4, 5.6
Symbols N in the diagram for OS, P-MOS, and N-MC87 respectively) *P1+N2+Pz+Na+Pa, N4+P
41N51P5#N61P61N7 will be used to illustrate this.

コントロール信号入力端90入力信号が接地レヘル(負
電圧〕のとき&X、C−MOSインバータ4のP4は導
通状態v N4は遮断状態となり、出力電圧は正電圧V
l)Dとなり、各C−MOSスイッチ1.2.3のP 
1 * P 2 e P 3のゲートGKは正電圧VD
Dが加わる。
When the input signal at the control signal input terminal 90 is at the ground level (negative voltage) &
l) D and P of each C-MOS switch 1.2.3
1 * P 2 e The gate GK of P 3 is a positive voltage VD
D is added.

またC−MOSインバータ5は、入力電圧が正電圧VD
Dとなるため、P5は遮断状態、N5は導通状態となっ
て、出力電圧は負電圧v8sとなり。
Further, the C-MOS inverter 5 has an input voltage of a positive voltage VD.
D, P5 becomes cut off, N5 becomes conductive, and the output voltage becomes a negative voltage v8s.

各C−MOSスイッチ1,2.3のN1 + N2 +
 N3のゲ−)Gに9工負電圧Vil18が加わる。
N1 + N2 + of each C-MOS switch 1, 2.3
A negative voltage Vil18 is applied to the gate of N3.

従って、各C−MOSスイッチ1,2.3はP−MC8
N−MOSともに遮断状態となり、信号入出力端8a 
、 8b間(工断状態となる。
Therefore, each C-MOS switch 1, 2.3 is P-MC8
Both N-MOS are cut off, and the signal input/output terminal 8a
, 8b (work will be interrupted).

この場合、N−MC87のN7. Its導通状態とな
り。
In this case, N7. of N-MC87. Its becomes conductive state.

C−MOSスイッチlのN、のボディは負電源Vlls
側に接続する。
The body of N of C-MOS switch l is the negative power supply Vlls
Connect to the side.

コントロール信号入力端90入力信号が正電圧になると
前記接地レベルのときと反対にC−MOSインバータ4
のP4は遮断状態s N4は導通状態となり、出力電圧
は負電圧V81]となり、各C−MOSスイッチ1,2
.3のP 1 r P 2 + P 3のゲートGには
負電圧V88が加わる。
When the control signal input terminal 90 input signal becomes a positive voltage, the C-MOS inverter 4
P4 is in the cut-off state, N4 is in the conductive state, and the output voltage is a negative voltage V81], and each C-MOS switch 1, 2
.. A negative voltage V88 is applied to the gate G of P 1 r P 2 + P 3 of No. 3.

また、C−MOSインバータ5は1.入力電圧が負電圧
’/ssとなるため、 P5は導通状態+ N5は遮断
状態となって、8力電圧は正電圧VDDとなり。
Moreover, the C-MOS inverter 5 is 1. Since the input voltage becomes a negative voltage '/ss, P5 is in a conductive state + N5 is in a cut-off state, and the 8-power voltage becomes a positive voltage VDD.

各C−MOSスイッチ1,2.3のNl + N2 +
 N3のゲ−)GKは正電圧VDDが加わる。
Nl + N2 + of each C-MOS switch 1, 2.3
A positive voltage VDD is applied to the gate of N3 (GK).

従って、各C−MOSスイッチ1,2.3は、 p −
MC8N−MC8ともに導通状態となり、信号入出力端
8a、8b間Q工接状態となる。
Therefore, each C-MOS switch 1, 2.3 has p −
Both MC8N and MC8 become conductive, and a Q-connection state occurs between the signal input/output terminals 8a and 8b.

この場合、N−MC87のN7は遮断状態となり。In this case, N7 of N-MC87 is in a cut-off state.

N1のボディはN 2 + N 3のソースと同電位に
保たれる。
The body of N1 is kept at the same potential as the source of N2+N3.

この回路は、C−MOSスイッチ1ON、のボディがオ
ン時に、ソース同電位となり、オフ時に負電圧Vlls
側に接続されt Nlのオン抵抗が上昇しないように構
成したものである。
This circuit has the same potential as the source when the body of the C-MOS switch 1ON is on, and a negative voltage Vlls when it is off.
It is connected to the side so that the on-resistance of tNl does not increase.

(発明が解決しようとする問題点) 上記回路構成では、スイッチ(信号入出力端8a、8b
間〕がオフからオンに切り替わる場合。
(Problems to be Solved by the Invention) In the above circuit configuration, the switches (signal input/output terminals 8a, 8b
] is switched from off to on.

各C−MOSスイッチ1.2.3のN、、N2.N3が
C−MOSインバータ6の入力段階の信号によって導通
状態となり、N−MOS7のN7がC−MOSインバー
タ6の出力段階の信号によって導通状態から遮断状態に
切り替わるのでs N7が遮断状態に切り替わるタイミ
ングがs  N 1 * N 2 r N aの導通状
態になるタイミングより一瞬遅れ、瞬間、N2またはN
3とN7 とを介して信号入出力端8a、8bと負電源
VIIs間が導通状態になり、信号を減衰させたり、接
続されている他の回路へ信号の回り込みなどがあり悪影
響を与えるという問題があった。
N, , N2 . of each C-MOS switch 1.2.3. Since N3 becomes conductive by the signal at the input stage of the C-MOS inverter 6, and N7 of N-MOS7 switches from the conductive state to the cutoff state by the signal at the output stage of the C-MOS inverter 6, the timing at which N7 switches to the cutoff state is is momentarily delayed from the timing when s N 1 * N 2 r N a becomes conductive, instantaneous, N2 or N
3 and N7, the signal input/output terminals 8a, 8b and the negative power supply VIIs become conductive, causing the signal to be attenuated and the signal to go around to other connected circuits, resulting in an adverse effect. was there.

本発明は、簡単な回路変更によって上記問題点を解消し
ようとするものである。
The present invention attempts to solve the above problems by simple circuit changes.

(問題点を解決するための手段ン 第1の発明に係るスイッチ回路は、従来の回路(第3図
)のC−MOSインバータ6のN−MOS(N6)のゲ
ートG6をP−MOSPsのゲートG6から切り離して
コントロール信号入力端9に接続したものである。
(Means for Solving the Problem) The switch circuit according to the first invention replaces the gate G6 of the N-MOS (N6) of the C-MOS inverter 6 of the conventional circuit (FIG. 3) with the gate G6 of the P-MOSPs. It is separated from G6 and connected to control signal input terminal 9.

また第2の発明に係るスイッチ回路は第1ON−10N
−を有し、これは従来の回路(第3図)のC−MOSス
イッチ1のN1のボディBとC−MOSスイッチ2 、
34) N2 、N5(r)7− スSとボディBとを
接続し、かツN7ノゲートGYC−MOSインバータ6
の出力側に接続し、N7のボディBを負電源v81]側
に接続する。
Further, the switch circuit according to the second invention is the first ON-10N.
-, which has body B of N1 of C-MOS switch 1 and C-MOS switch 2 of the conventional circuit (Fig. 3),
34) Connect N2, N5(r)7- S and body B, and connect N7 gate GYC-MOS inverter 6
The body B of N7 is connected to the negative power supply v81] side.

また第2のN−MOS 7 aを有しv N7aのゲー
トGをC−MOSインバータ4の出方側に接続し。
It also has a second N-MOS 7a, and the gate G of the N7a is connected to the output side of the C-MOS inverter 4.

ボディBと接続したソースSを負電源v88側に接続し
、この第2のN−MOS7aを介して、負電源V8g側
に接続したものである。
The source S connected to the body B is connected to the negative power supply V88 side, and is connected to the negative power supply V8g side via this second N-MOS 7a.

(実施例) 以下9本発明の各・実施例を図について説明する。(Example) Each of the nine embodiments of the present invention will be described below with reference to the drawings.

第1図は第1の発明の一実施例を示す回路図である。構
成素子は従来のものと変りがない。
FIG. 1 is a circuit diagram showing an embodiment of the first invention. The components are the same as conventional ones.

従来の回路のC−MOSイyバータロのN6のゲートG
6をP6のゲートG6と切り離して、コントロール信号
入力端9に接続したものである。
Conventional circuit C-MOS Iy Bartalo N6 gate G
6 is separated from the gate G6 of P6 and connected to the control signal input terminal 9.

このゲートの接続の変更によってコントロール信号入力
端90入力信号でスイッチがオフからオンになるとき’
Is y N 1 * N 2 + N 3が導通状態
になるより早く、コントロール信号入力端9からの入力
信号が直接N6のゲートG6に加わるのでN6が導通状
態となり、N7は、ゲート電圧が負電圧となり、遮断状
態となる。
When the control signal input terminal 90 input signal changes the switch from off to on by changing the connection of this gate.
Before Is y N 1 * N 2 + N 3 becomes conductive, the input signal from the control signal input terminal 9 is directly applied to the gate G6 of N6, so N6 becomes conductive, and the gate voltage of N7 becomes a negative voltage. This results in a cutoff state.

従って、スイッチがオフからオンに切り替わる瞬間、信
号入出力端8a 、 8bと負電源D[lEl側が導通
状態になることがなくなる。
Therefore, the signal input/output terminals 8a, 8b and the negative power source D[lEl side will not become electrically connected at the moment the switch is turned from off to on.

スイッチオンからオフになるとき&! s N 1 +
 N 2 *N3が遮断状態となった後にyP6が導通
状態となり、 N7はゲート電圧が正電圧となり、導通
状態となる。
When switching from on to off &! s N 1 +
After N 2 *N3 enters the cutoff state, yP6 becomes conductive, and the gate voltage of N7 becomes positive and becomes conductive.

第2図は第2の発明の一実施例を示す回路図である。FIG. 2 is a circuit diagram showing an embodiment of the second invention.

第1 ON−MOS7(N7)&!ボディBを負電源V
[]s側に接続し、ゲートGをC−MOSインバータ6
の出力側に接続したままとし、このN7と負電源Vss
側どの間に第2ON−MOS7aを有し、このドレイン
DをN7のソースSに接続し、ボディBと接続したソー
スSを負電源V8[+側に接続し。
1st ON-MOS7 (N7) &! body B to negative power supply V
[ ] Connect to the s side and connect the gate G to the C-MOS inverter 6
Leave it connected to the output side of N7 and the negative power supply Vss.
A second ON-MOS 7a is provided between the sides, its drain D is connected to the source S of N7, and the source S connected to the body B is connected to the negative power supply V8 [+ side].

ゲートGをC−MOSインバータ4の出力側に接続した
ものである。
The gate G is connected to the output side of the C-MOS inverter 4.

上記のような回路構成にすると、スイッチがオフからオ
ンに切り替わるとき&X +  N1 、 N2 、 
N3が導通状態になるより早(、C−MOSインバータ
4の出力がN7aのゲートGに加わりN7aが遮断状態
となる。
With the above circuit configuration, when the switch changes from off to on, &X + N1, N2,
Before N3 becomes conductive (the output of C-MOS inverter 4 is applied to the gate G of N7a, N7a becomes cut off).

従って、スイッチがオフからオンに切り替する瞬間、信
号入出力端8a 、 8bと負電源VB2側が導通状態
になることがな(なる。
Therefore, the signal input/output terminals 8a, 8b and the negative power supply VB2 side do not become electrically connected at the moment the switch is switched from off to on.

スイッチがオンからオフになるときQ工+N1+N 2
 + N 3が遮断状態となった後にy N7が導通状
態となる。
When the switch goes from on to off, Q + N1 + N 2
After +N3 is cut off, yN7 becomes conductive.

(発明の効果) 以上述べたように2本発明によれば9回路の接続を一部
変更するか、または一つの素子を付加するという簡単な
変更によって、従来の回路におけるオフからオンへの切
り替え時の信号入出力端と負電源間の導通現象がな(な
り、この導通現象による信号の減衰、他の回路への悪影
響がな(なるという効果がある。
(Effects of the Invention) As described above, according to the present invention, switching from OFF to ON in the conventional circuit can be achieved by simply changing some of the connections of the 9 circuits or adding one element. This has the effect that there is no conduction between the signal input/output terminal and the negative power supply, and this conduction phenomenon eliminates signal attenuation and adverse effects on other circuits.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は第1の発明の一実施例を示す回路図。 第2図は第2の発明の一実施例を示す回路図。 第3図はC−MOSスイッチを用いた従来のアナログス
イッチ回路の代表例を示す回路図である。 ]、 、 2 、3・・・C−MOSスイッチ、4,5
.6・・・C−MOSインバータ、7−・・第1のN 
 MOS、  7a・−第2ON−MOS、  8a、
8b・・・信号入出力端、9・・・コントロール信号入
力端。
FIG. 1 is a circuit diagram showing an embodiment of the first invention. FIG. 2 is a circuit diagram showing an embodiment of the second invention. FIG. 3 is a circuit diagram showing a typical example of a conventional analog switch circuit using a C-MOS switch. ], , 2, 3...C-MOS switch, 4, 5
.. 6...C-MOS inverter, 7-...1st N
MOS, 7a--2nd ON-MOS, 8a,
8b...Signal input/output terminal, 9...Control signal input terminal.

Claims (2)

【特許請求の範囲】[Claims] (1)C−MOS1、2、3からなるスイッチ回路と、
C−MOS4、5、6からなるインバータ回路及びこれ
ら両回路間に挿入接続されたN−MOS7とからなるス
イッチ回路において、前記C−MOSインバータ6のN
−MOS(N6)のゲートG6をP−MOS(P6)の
ゲートG6から切り離して、N6のゲートG6をコント
ロール信号入力端に接続する回路構成によって、本スイ
ッチ回路がオフからオンになるときC−MOS1、2、
3のN−MOS(N_1、N_2、N_3)が導通状態
になる以前に、前記コントロール信号入力端からのコン
トロール信号が前記インバータ回路6のN−MOS(N
6)のゲートG6に加わるようにしてN6を導通状態と
し、N−MOS7のN7のゲート電圧を負電圧として遮
断状態とし、信号入出力端子間と負電源側が導通状態に
なることを防止するようにしたことを特徴とするアナロ
グ信号のスイッチ回路。
(1) A switch circuit consisting of C-MOS 1, 2, and 3,
In a switch circuit consisting of an inverter circuit consisting of C-MOS 4, 5, and 6 and an N-MOS 7 inserted and connected between these two circuits, the N of the C-MOS inverter 6 is
- By separating the gate G6 of MOS (N6) from the gate G6 of P-MOS (P6) and connecting the gate G6 of N6 to the control signal input terminal, when this switch circuit is turned on from off, C- MOS1, 2,
Before the N-MOS (N_1, N_2, N_3) of the inverter circuit 6 becomes conductive, the control signal from the control signal input terminal is applied to the N-MOS (N_3) of the inverter circuit 6.
6) to make N6 conductive so as to apply it to gate G6, and set the gate voltage of N7 of N-MOS7 to a negative voltage to make it cut off, thereby preventing conduction between the signal input/output terminal and the negative power supply side. An analog signal switch circuit characterized by:
(2)C−MOS1、2、3からなるスイッチ回路と、
C−MOS4、5、6からなるインバータ回路及びこれ
ら両回路間に挿入接続された第1のN−MOS7とから
なるスイッチ回路において、前記第1のN−MOS(N
7)のボディBを負電源側に接続し、ゲートGをC−M
OSインバータ6の出力側に接続し、また前記N7と負
電源側との間に第2のN−MOS7aを挿入接続し、そ
のドレインDをN7のソースSに接続し、またそのボデ
ィBと接続したソースSを負電源側に接続し、さらにそ
のゲートGをN−MOSインバータ4の出力側に接続す
る回路構成によって、本スイッチ回路がオフからオンに
切り替わるときC−MOS1、2、3のN−MOS(N
_1、N_2、N_3)が導通状態になる以前にC−M
OSインバータ4の出力が第2のN−MOS7a(N7
a)のゲートGに加わるようにしてN7aを遮断状態と
し、信号入出力端子間と負電源側が導通状態になること
を防止するようにしたことを特徴とするアナログ信号の
スイッチ回路。
(2) a switch circuit consisting of C-MOS 1, 2, and 3;
In a switch circuit consisting of an inverter circuit consisting of C-MOSs 4, 5, and 6 and a first N-MOS 7 inserted and connected between these two circuits, the first N-MOS (N
7) Body B is connected to the negative power supply side, and gate G is connected to C-M.
It is connected to the output side of the OS inverter 6, and a second N-MOS 7a is inserted and connected between the N7 and the negative power supply side, its drain D is connected to the source S of N7, and its body B is connected. With the circuit configuration in which the source S is connected to the negative power supply side and the gate G is connected to the output side of the N-MOS inverter 4, when this switch circuit is switched from off to on, the N of C-MOS 1, 2, and 3 is -MOS(N
_1, N_2, N_3) becomes conductive.
The output of the OS inverter 4 is connected to the second N-MOS 7a (N7
An analog signal switch circuit characterized in that N7a is cut off so as to be applied to the gate G of a) to prevent conduction between the signal input/output terminals and the negative power supply side.
JP60030626A 1985-02-20 1985-02-20 Switch circuit for analog signal Pending JPS61192121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60030626A JPS61192121A (en) 1985-02-20 1985-02-20 Switch circuit for analog signal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60030626A JPS61192121A (en) 1985-02-20 1985-02-20 Switch circuit for analog signal

Publications (1)

Publication Number Publication Date
JPS61192121A true JPS61192121A (en) 1986-08-26

Family

ID=12309058

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60030626A Pending JPS61192121A (en) 1985-02-20 1985-02-20 Switch circuit for analog signal

Country Status (1)

Country Link
JP (1) JPS61192121A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01198823A (en) * 1988-02-03 1989-08-10 Nec Corp Input circuit
JPH06169247A (en) * 1992-11-30 1994-06-14 New Japan Radio Co Ltd Analog switch
DE102008023959A1 (en) * 2008-05-16 2009-12-10 Austriamicrosystems Ag Switch arrangement for switchable connection of two connectors, has auxiliary switch connected with connection point and with connector, and sub-switch connected with connection point and with supply potential

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57192128A (en) * 1981-05-20 1982-11-26 Jido Keisoku Gijutsu Kenkiyuukumiai Analog switch circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57192128A (en) * 1981-05-20 1982-11-26 Jido Keisoku Gijutsu Kenkiyuukumiai Analog switch circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01198823A (en) * 1988-02-03 1989-08-10 Nec Corp Input circuit
JPH06169247A (en) * 1992-11-30 1994-06-14 New Japan Radio Co Ltd Analog switch
DE102008023959A1 (en) * 2008-05-16 2009-12-10 Austriamicrosystems Ag Switch arrangement for switchable connection of two connectors, has auxiliary switch connected with connection point and with connector, and sub-switch connected with connection point and with supply potential

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