CN204304938U - The subtracter of rail-to-rail discharge circuit and formation - Google Patents
The subtracter of rail-to-rail discharge circuit and formation Download PDFInfo
- Publication number
- CN204304938U CN204304938U CN201420702058.6U CN201420702058U CN204304938U CN 204304938 U CN204304938 U CN 204304938U CN 201420702058 U CN201420702058 U CN 201420702058U CN 204304938 U CN204304938 U CN 204304938U
- Authority
- CN
- China
- Prior art keywords
- rail
- resistance
- voltage
- effect transistor
- field effect
- 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.)
- Active
Links
Landscapes
- Amplifiers (AREA)
Abstract
The subtracter that the utility model discloses rail-to-rail discharge circuit and utilize rail-to-rail discharge circuit to form; Described rail-to-rail discharge circuit, comprise operational amplifier, P raceway groove and N raceway groove mutual symmetry to drain output circuit, it is characterized in that: described P raceway groove and the N raceway groove mutual symmetry output circuit that drains comprises P channel MOS field effect transistor, N-channel MOS field effect transistor, the first resistance, the first voltage-stabiliser tube, the second voltage-stabiliser tube and the second resistance; Between the source electrode that first resistance, the first voltage-stabiliser tube, the second voltage-stabiliser tube and the second resistance are connected to P channel MOS field effect transistor after connecting in order and the source electrode of N-channel MOS field effect transistor; The connected node of the first resistance and the first voltage-stabiliser tube negative pole is connected with the grid of P channel MOS field effect transistor; The utility model utilizes P raceway groove and N raceway groove mutual symmetry to drain output circuit, and output voltage both can reach supply voltage, can be low to moderate 0.01V again, the rail-to-rail characteristic had, and can be applicable in thick film circuit and low-voltage linear measuring circuit.
Description
Technical field
The utility model relates to discharge circuit, is specifically related to the subtracter of rail-to-rail discharge circuit and formation.
Background technology
Operational amplifier is extensive use, has the circuit unit of superelevation multiplication factor.Can be made up of discrete device, also can be implemented in the middle of semiconductor chip.Along with the development of semiconductor technology, nowadays the amplifier of the overwhelming majority exists with the form of monolithic.Amplifier is of a great variety now, is widely used in the middle of nearly all industry.
Common rail-to-rail amplifier, when single supply works, the output stage of operational amplifier is triode, because triode exists saturation voltage drop; Make circuit working in Linear Amplifer state, then circuit can not enter saturation region, and therefore rail-to-rail characteristic is bad, and the pressure reduction of its distance power supply has more than 0.3V usually.
Utility model content
One of technical problem to be solved in the utility model is to provide a kind of rail-to-rail discharge circuit.
Two of technical problem to be solved in the utility model is to provide the subtracter adopting rail-to-rail discharge circuit to form.
In order to solve the problem, according to first technical scheme of the present utility model, rail-to-rail discharge circuit, comprises operational amplifier, P raceway groove and N raceway groove mutual symmetry and to drain output circuit, be characterized in:
Described P raceway groove and the N raceway groove mutual symmetry output circuit that drains comprises P channel MOS field effect transistor, N-channel MOS field effect transistor, the first resistance, the first voltage-stabiliser tube, the second voltage-stabiliser tube and the second resistance; Between the source electrode that first resistance, the first voltage-stabiliser tube, the second voltage-stabiliser tube and the second resistance are connected to P channel MOS field effect transistor after connecting in order and the source electrode of N-channel MOS field effect transistor; The connected node of the first resistance and the first voltage-stabiliser tube negative pole is connected with the grid of P channel MOS field effect transistor, the connected node of the second voltage-stabiliser tube positive pole and the second resistance is connected with the grid of N-channel MOS field effect transistor, and the connected node of the first voltage-stabiliser tube positive pole and the second voltage-stabiliser tube negative pole is connected with the output of operational amplifier; The drain electrode of P channel MOS field effect transistor is connected with the drain electrode of N-channel MOS field effect transistor and as the output of described rail-to-rail discharge circuit.
The output stage of operational amplifier of the present utility model adopts field effect transistor, it is low that field effect transistor has conducting resistance, off-resistances is tending towards infinitely-great feature, P raceway groove and N raceway groove mutual symmetry is utilized to drain output circuit, when providing suitable quiescent point for it, there is very large voltage ratio variable quantity, when single supply works, output voltage can be made both can to reach supply voltage, can 0.01V be low to moderate again, therefore there is good rail-to-rail characteristic.
According to second technical scheme of the present utility model, the subtracter utilizing rail-to-rail discharge circuit to form, is characterized in: this subtracter comprises described rail-to-rail discharge circuit, the three ~ seven resistance; Between the output being connected to described rail-to-rail discharge circuit after 5th resistance and the 3rd resistant series and ground; The connected node of the 5th resistance and the 3rd resistance connects the positive input terminal of operational amplifier; The signal being connected to subtracter after 7th resistance and the 4th resistant series inputs between ground, the connected node of the 7th resistance and the 4th resistance connects the negative input end of operational amplifier, the source electrode of P channel MOS field effect transistor connects positive source, the source ground of N-channel MOS field effect transistor.
The beneficial effect of the subtracter of rail-to-rail discharge circuit described in the utility model and formation is: the utility model utilizes P raceway groove and N raceway groove mutual symmetry to drain output circuit, output voltage can be made both can to reach supply voltage, can 0.01V be low to moderate again, there is good rail-to-rail characteristic; Further, utilize negative-feedback circuit, low-voltage output can be made to have good linear relationship, at low cost, just can reach desirable rail-to-rail amplifier performance; Can be applicable in thick film circuit and low-voltage linear measuring circuit.
Accompanying drawing explanation
Fig. 1 is rail-to-rail discharge circuit schematic diagram described in the utility model.
Fig. 2 is the subtraction circuit schematic diagram utilizing rail-to-rail discharge circuit to form.
Fig. 3 is the subtracter analogous diagram utilizing rail-to-rail discharge circuit to form.
Embodiment
See Fig. 1, rail-to-rail discharge circuit, comprises operational amplifier 101, P raceway groove and N raceway groove mutual symmetry and to drain output circuit 102, be characterized in:
Described P raceway groove and the N raceway groove mutual symmetry output circuit 102 that drains comprises P channel MOS field effect transistor Q1, N-channel MOS field effect transistor Q2, the first resistance R1, the first voltage-stabiliser tube D4, the second voltage-stabiliser tube D5 and the second resistance R2; Between the source electrode being connected to P channel MOS field effect transistor Q1 after first resistance R1, the first voltage-stabiliser tube D4, the second voltage-stabiliser tube D5 and the second resistance R2 connect in order and the source electrode of N-channel MOS field effect transistor Q2; The connected node of the first resistance R1 and the first voltage-stabiliser tube D4 negative pole is connected with the grid of P channel MOS field effect transistor Q1, the connected node of the second voltage-stabiliser tube D5 positive pole and the second resistance R2 is connected with the grid of N-channel MOS field effect transistor Q2, and the connected node of the first voltage-stabiliser tube D4 positive pole and the second voltage-stabiliser tube D5 negative pole is connected with the output of operational amplifier 101; The drain electrode of P channel MOS field effect transistor Q1 is connected with the drain electrode of N-channel MOS field effect transistor Q2 and as the output of described rail-to-rail discharge circuit; When duplicate supply inputs, the source electrode of P channel MOS field effect transistor Q1 connects positive supply, and the source electrode of N-channel MOS field effect transistor Q2 connects negative supply, and when single supply inputs, the source electrode of P channel MOS field effect transistor Q1 connects power supply, the source ground of N-channel MOS field effect transistor Q2.
In a particular embodiment, operational amplifier 101 adopts LM324.In circuit, the drain electrode of Q1, Q2 forms the output of rail-to-rail discharge circuit.The quiescent point that first resistance R1, the first voltage-stabiliser tube D4, the second voltage-stabiliser tube D5 and the second resistance R2 form field effect transistor arranges circuit.When duplicate supply inputs, the dividing potential drop that R1, R2 and D4, D5 are formed makes the grid of Q1, Q2 obtain a slight quiescent voltage to source electrode, ensures that circuit static electric current is very little.The reason of employing voltage-stabiliser tube D4, D5 is: utilize voltage-stabiliser tube equivalent d.c. resistance large, the feature that AC equivalent resistance is little, improve the control ability of LM324.
See Fig. 2, utilize the subtracter that rail-to-rail discharge circuit is formed, this subtracter comprises rail-to-rail discharge circuit, the three ~ seven resistance; Described rail-to-rail discharge circuit comprises operational amplifier 101 and P raceway groove and N raceway groove mutual symmetry and to drain output circuit 102; Described P raceway groove and the N raceway groove mutual symmetry output circuit 102 that drains comprises P channel MOS field effect transistor Q1, N-channel MOS field effect transistor Q2, the first resistance R1, the first voltage-stabiliser tube D4, the second voltage-stabiliser tube D5 and the second resistance R2; Between the source electrode being connected to P channel MOS field effect transistor Q1 after first resistance R1, the first voltage-stabiliser tube D4, the second voltage-stabiliser tube D5 and the second resistance R2 connect in order and the source electrode of N-channel MOS field effect transistor Q2; The connected node of the first resistance R1 and the first voltage-stabiliser tube D4 negative pole is connected with the grid of P channel MOS field effect transistor Q1, the connected node of the second voltage-stabiliser tube D5 positive pole and the second resistance R2 is connected with the grid of N-channel MOS field effect transistor Q2, and the connected node of the first voltage-stabiliser tube D4 positive pole and the second voltage-stabiliser tube D5 negative pole is connected with the output of operational amplifier 101; The drain electrode of P channel MOS field effect transistor Q1 is connected with the drain electrode of N-channel MOS field effect transistor Q2 and as the output of described rail-to-rail discharge circuit; The in-phase input end of operational amplifier 101 is the inverting input of rail-to-rail discharge circuit, and the inverting input of operational amplifier 101 is the in-phase input end of rail-to-rail discharge circuit; The source electrode of P channel MOS field effect transistor Q1 connects power supply, and the source electrode of N-channel MOS field effect transistor Q2 connects ground; The source electrode of P channel MOS field effect transistor Q1 connects positive source, the source ground of N-channel MOS field effect transistor Q2;
Between the output that 5th resistance R5 is connected to described rail-to-rail discharge circuit after connecting with the 3rd resistance R3 and ground; The connected node of the 5th resistance R5 and the 3rd resistance R3 connects the in-phase input end of operational amplifier 101; 7th resistance R7 is connected to subtracter signal after connecting with the 4th resistance R4 inputs between ground, and the connected node of the 7th resistance R7 and the 4th resistance R4 connects the inverting input of operational amplifier 101.
When adopting single power supply, do emulation testing as following table to the subtracter utilizing rail-to-rail discharge circuit described in the utility model to form, analogous diagram is as Fig. 3.
As can be seen from test data, the linearity and output voltage is minimum, maximum is all ideal, has desirable rail-to-rail characteristic.
Claims (2)
1. rail-to-rail discharge circuit, comprises operational amplifier (101), P raceway groove and N raceway groove mutual symmetry and to drain output circuit (102), it is characterized in that:
Described P raceway groove and the N raceway groove mutual symmetry output circuit (102) that drains comprises P channel MOS field effect transistor (Q1), N-channel MOS field effect transistor (Q2), the first resistance (R1), the first voltage-stabiliser tube (D4), the second voltage-stabiliser tube (D5) and the second resistance (R2); First resistance (R1), the first voltage-stabiliser tube (D4), the second voltage-stabiliser tube (D5) and the second resistance (R2) are connected between the source electrode of P channel MOS field effect transistor (Q1) and the source electrode of N-channel MOS field effect transistor (Q2) after connecting in order; The connected node of the first resistance (R1) and the first voltage-stabiliser tube (D4) negative pole is connected with the grid of P channel MOS field effect transistor (Q1), the connected node of the second voltage-stabiliser tube (D5) positive pole and the second resistance (R2) is connected with the grid of N-channel MOS field effect transistor (Q2), and the first voltage-stabiliser tube (D4) positive pole is connected with the output of the same operational amplifier of connected node (101) of the second voltage-stabiliser tube (D5) negative pole; The drain electrode of P channel MOS field effect transistor (Q1) is connected with the drain electrode of N-channel MOS field effect transistor (Q2) and as the output of described rail-to-rail discharge circuit.
2. include a subtracter for rail-to-rail discharge circuit according to claim 1, it is characterized in that: this subtracter comprises described rail-to-rail discharge circuit, the three ~ seven resistance;
Between the output that 5th resistance (R5) is connected to described rail-to-rail discharge circuit after connecting with the 3rd resistance (R3) and ground; 5th resistance (R5) connects the positive input terminal of operational amplifier (101) with the connected node of the 3rd resistance (R3); 7th resistance (R7) is connected to subtracter signal after connecting with the 4th resistance (R4) inputs between ground, 7th resistance (R7) connects the negative input end of operational amplifier (101) with the connected node of the 4th resistance (R4), the source electrode of P channel MOS field effect transistor (Q1) connects positive source, the source ground of N-channel MOS field effect transistor (Q2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420702058.6U CN204304938U (en) | 2014-11-19 | 2014-11-19 | The subtracter of rail-to-rail discharge circuit and formation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420702058.6U CN204304938U (en) | 2014-11-19 | 2014-11-19 | The subtracter of rail-to-rail discharge circuit and formation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204304938U true CN204304938U (en) | 2015-04-29 |
Family
ID=53110442
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420702058.6U Active CN204304938U (en) | 2014-11-19 | 2014-11-19 | The subtracter of rail-to-rail discharge circuit and formation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204304938U (en) |
-
2014
- 2014-11-19 CN CN201420702058.6U patent/CN204304938U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102722207B (en) | Low dropout regulator (LDO) | |
| CN108646837A (en) | A kind of transient response for low pressure difference linear voltage regulator improves circuit | |
| CN103036516B (en) | Low supply voltage high cmrr operational amplifier | |
| CN104426491B (en) | Operational amplification circuit, active electrode and electricity physiological signal acquisition system | |
| CN102480276B (en) | Foldable cascade operational amplifier | |
| CN103457554B (en) | Rail-to-rail operational amplifier | |
| CN202713239U (en) | Capacitance amplifying circuit | |
| CN204304938U (en) | The subtracter of rail-to-rail discharge circuit and formation | |
| CN103647519A (en) | Input stage of operational amplifier | |
| CN203405751U (en) | Novel voltage stabilizer circuit structure | |
| CN206505339U (en) | A kind of reference circuit of low compensating electric capacity value | |
| CN204496325U (en) | A kind of band-gap reference circuit | |
| CN203013736U (en) | MOS tube electrical resistor | |
| CN204244532U (en) | A kind of LDO circuit for LED driver | |
| CN104299647A (en) | Negative pressure converting circuit | |
| CN101562426A (en) | Power amplification circuit | |
| CN204810238U (en) | Auto bias CMOS difference amplifier and integrator | |
| CN203457134U (en) | Metal-oxide field-effect transistor and bipolar transistor-contained mixed common-source common-base circuit | |
| CN207752400U (en) | A kind of compensation circuit for reference voltage source | |
| CN202887043U (en) | Low-dropout voltage stabilizing circuit | |
| CN204334504U (en) | Easy Resistance and Capacitance Coupled Amplification Circuit | |
| CN110445482A (en) | A kind of comparator of the high Slew Rate of low-power consumption | |
| CN203289404U (en) | CMOS buffer circuit capable of driving high capacitive load | |
| CN202535312U (en) | Small signal capacitance amplifying circuit device | |
| CN104124933A (en) | Amplification circuit, circuit board and electronic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |