CN111580437B - Enabling control circuit and electronic equipment - Google Patents
Enabling control circuit and electronic equipment Download PDFInfo
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Abstract
The application discloses enable control circuit and electronic equipment, enable control circuit includes: the current source generation module comprises a first branch and a second branch, a third current generated in the third branch and a first current generated in the first branch are mirror images of each other, and the first branch and the second branch are both positive temperature coefficients or negative temperature coefficients, so that the influence of temperature change on the currents generated in the first branch, the second branch and the third branch is eliminated.
Description
Technical Field
The present application relates to the field of circuit design technologies, and more particularly, to an enable control circuit and an electronic device.
Background
In the field of semiconductor technology, an enable signal terminal of a chip is an input port for controlling the operation or the shutdown of the chip, for example, when the enable signal terminal of the chip receives a high level, the chip starts to operate, and when the enable signal terminal of the chip receives a low level, the chip stops operating.
The circuit for providing the enable signal to the enable signal terminal of the chip is called an enable control circuit, the enable control circuit receives the working power supply and the input signal, the enable control circuit does not output an active enable signal (for example, outputs a low level) until the input signal reaches a set value, and the enable control circuit outputs an active enable signal (for example, outputs a high level) after the input signal reaches the set value, which is usually called a flip level (or a transition level).
However, the inventor finds that, in the actual use process, due to the influence of temperature, device process angle, and the like, the flip level of the enable control circuit fluctuates with the change of temperature, so that part of the enable control circuits in the prior art cannot be applied to a circuit (for example, an undervoltage protection circuit) with a high requirement on the precision of the flip level.
Disclosure of Invention
In order to solve the technical problem, the application provides an enable control circuit and an electronic device, so as to achieve the purpose of improving the precision of the turning level of the enable control circuit and reduce the influence of temperature on the turning level.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
an enable control circuit comprising: the current source generating module, the third branch circuit and the output module; wherein,
the current source generation module includes: the input end of the first branch circuit is electrically connected with the input end of the second branch circuit, and the input end of the first branch circuit is used for receiving a working power supply; the output end of the first branch circuit is electrically connected with the output end of the second branch circuit and a fixed potential end, and the potential of the fixed potential end is smaller than that of the working power supply;
the first branch circuit is used for generating a first current when the potential of the working power supply exceeds a first preset threshold;
the second branch circuit is used for generating a second current which is a mirror image of the first current when the potential of the working power supply exceeds a first preset threshold; the first branch circuit and the second branch circuit are both positive temperature coefficients or both negative temperature coefficients;
the first input end of the third branch is electrically connected with the input end of the first branch and the input end of the second branch and is used for receiving the working power supply, the second input end of the third branch is used for receiving an input signal, the output end of the third branch is electrically connected with the input end of the output module, and the grounding end of the third branch is electrically connected with the fixed potential end;
the third branch circuit is used for generating a third current which is a mirror image of the first current when the potential of the working power supply exceeds the first preset threshold value, and is used for pulling down the potential of the output end of the third branch circuit to be the potential of the fixed potential end when the amplitude of the input signal is greater than or equal to a second preset threshold value;
and the output module is used for outputting an enable signal when the potential of the output end of the third branch circuit is pulled down to the potential of the fixed potential end.
Optionally, the first branch includes a first temperature compensation device;
the second branch comprises a second temperature compensation device;
the amplitudes of the first current and the second current are determined by the difference value between the voltage drop at two ends of the second temperature compensation device and the voltage drop between the control end and the output end of the first temperature compensation device, and the first temperature compensation device and the second temperature compensation device are both negative temperature coefficient devices or both positive temperature coefficient devices;
optionally, the third branch comprises a control device;
the control end of the control device is used as the second input end of the third branch circuit, and the output end of the control device is used as the grounding end of the third branch circuit; and the control device is used for pulling down the potential of the output end of the third branch circuit to the potential of the fixed potential end when the amplitude of the input signal is greater than or equal to a second preset threshold value.
Optionally, the control device and the first temperature compensation device are devices of the same process.
Optionally, the first branch includes: a first transistor, a second transistor, a load unit; wherein,
the control end of the first transistor is electrically connected with the input end of the second temperature compensation device, the output end of the first transistor is electrically connected with the input end of the load unit, the input end of the first transistor is electrically connected with the control end of the second transistor and the output end of the second transistor, and the input end of the second transistor is the input end of the first branch circuit;
the output end of the load unit is electrically connected with the fixed potential end;
the first transistor is an N-type depletion MOS (metal oxide semiconductor) tube, the first transistor is a first temperature compensation device, and the first temperature compensation device is a negative temperature coefficient device;
the second transistor is a P-type enhancement type MOS transistor.
Optionally, the second branch includes: a fourth transistor and a first diode; wherein,
the control end of the fourth transistor is electrically connected with the control end of the second transistor, the input end of the fourth transistor is electrically connected with the input end of the second transistor, and the output end of the fourth transistor is electrically connected with the control end of the first transistor and the input end of the first diode;
the output end of the first diode is electrically connected with the fixed potential end, the first diode is used as the second temperature compensation device, and the second temperature compensation device is a negative temperature coefficient device;
the fourth transistor is a P-type enhancement MOS tube.
Optionally, the third branch includes a third transistor and a fifth transistor; wherein,
a control end of the third transistor is electrically connected with a control end of the second transistor, an input end of the third transistor is electrically connected with an input end of the second transistor and serves as an input end of the third branch, and an output end of the third transistor is electrically connected with an input end of the fifth transistor;
the control end of the fifth transistor is used for receiving the input signal;
the output end of the fifth transistor is electrically connected with the fixed potential end;
the third transistor is a P-type enhancement type MOS transistor, and the fifth transistor is an N-type enhancement type MOS transistor.
Optionally, the first preset threshold is a threshold voltage of the second transistor;
the second preset threshold is a threshold voltage of the fifth transistor.
Optionally, the load unit includes a first resistor and a second resistor; wherein,
one end of the second resistor is electrically connected with the output end of the first transistor, and the other end of the second resistor is connected with the first end of the first resistor;
the other end of the first resistor is electrically connected with the fixed potential end;
the connection node of the first resistor and the second resistor is the intermediate potential end;
the substrate of the fifth transistor is electrically connected to the terminal of intermediate potential so that the output signal of the terminal of intermediate potential provides a substrate bias potential for the fifth transistor.
Optionally, the fixed potential terminal is a zero potential terminal.
Optionally, the output module is an inverter.
An electronic device comprising an enable control circuit as claimed in any preceding claim.
As can be seen from the foregoing technical solutions, an embodiment of the present application provides an enable control circuit and an electronic device, where the enable control circuit includes: the current source generation module comprises a first branch and a second branch, a third current generated in the third branch and a first current generated in the first branch are mirror images of each other, and the first branch and the second branch are both positive temperature coefficients or negative temperature coefficients, so that the influence of temperature change on the currents generated in the first branch, the second branch and the third branch is eliminated.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of an enable control circuit in the prior art;
FIG. 2 is a schematic diagram of another enable control circuit in the prior art;
fig. 3 is a schematic structural diagram of an enable control circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an enable control circuit according to another embodiment of the present application.
Detailed Description
As described in the background, the flip level of the prior art enable control circuit may fluctuate within a certain range due to the influence of the operating power, temperature, and device process corner, and such fluctuations may not be tolerable for some high-precision application scenarios.
Therefore, for some circuits (for example, undervoltage protection circuits) with high requirements for the precision of the flip level, a circuit structure shown in fig. 1 is often adopted in the prior art, and the circuit structure is composed of a bandgap reference circuit BG, a comparator Comp, and a voltage division circuit composed of two resistors R.
Referring to fig. 2, fig. 2 is another enable control circuit structure provided in the prior art, the circuit structure includes an inverter and first to eleventh transistors (denoted by M1-M11 in fig. 2), and the specific connection relationships refer to fig. 2, V in fig. 2DDIndicating the operating power supply, EN the input signal, and Vout the output signal of the enable control circuit.
The circuit structure shown in fig. 2 can make the fluctuation range of the flip level of the circuit smaller, but the specific value of the flip level of the circuit structure is still influenced by the process angle and the temperature change of the device, so that the precision of the flip level is still lower.
In view of this, an embodiment of the present application provides an enable control circuit, including: the current source generating module, the third branch circuit and the output module; wherein,
the current source generation module includes: the input end of the first branch circuit is electrically connected with the input end of the second branch circuit, and the input end of the first branch circuit is used for receiving a working power supply; the output end of the first branch circuit is electrically connected with the output end of the second branch circuit and a fixed potential end, and the potential of the fixed potential end is smaller than that of the working power supply;
the first branch circuit is used for generating a first current when the potential of the working power supply exceeds a first preset threshold;
the second branch circuit is used for generating a second current which is a mirror image of the first current when the potential of the working power supply exceeds a first preset threshold; the first branch circuit and the second branch circuit are both positive temperature coefficients or both negative temperature coefficients;
the first input end of the third branch is electrically connected with the input end of the first branch and the input end of the second branch and is used for receiving the working power supply, the second input end of the third branch is used for receiving an input signal, the output end of the third branch is electrically connected with the input end of the output module, and the grounding end of the third branch is electrically connected with the fixed potential end;
the third branch circuit is used for generating a third current which is a mirror image of the first current when the potential of the working power supply exceeds the first preset threshold value, and is used for pulling down the potential of the output end of the third branch circuit to be the potential of the fixed potential end when the amplitude of the input signal is greater than or equal to a second preset threshold value;
and the output module is used for outputting an enable signal when the potential of the output end of the third branch circuit is pulled down to the potential of the fixed potential end.
The enable control circuit includes: the current source generation module comprises a first branch and a second branch, a third current generated in the third branch and a first current generated in the first branch are mirror images of each other, and the first branch and the second branch are both positive temperature coefficients or negative temperature coefficients, so that the influence of temperature change on the currents generated in the first branch, the second branch and the third branch is eliminated.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides an enable control circuit, as shown in fig. 3, including: a current source generating module 100, a third branch 200 and an output module 300; wherein,
the current source generating module 100 includes: a first branch 110 and a second branch 120, an input terminal IN1 of the first branch 110 being electrically connected with an input terminal IN2 of the second branch 120, the input terminal IN1 of the first branch 110 being for receiving an operating power supply VDD; the output terminal OUT1 of the first branch 110 is electrically connected to the output terminal OUT2 of the second branch 120 and a fixed potential terminal, such as GND, which is lower than the potential of the operating power supply VDD;
the first branch circuit 110 is configured to generate a first current I1 when the potential of the working power supply VDD exceeds a first preset threshold;
the second branch circuit 120 is configured to generate a second current I2 that is a mirror image of the first current I1 when the potential of the working power supply VDD exceeds a first preset threshold; the first branch circuit 110 and the second branch circuit 120 both have positive temperature coefficients or negative temperature coefficients;
a first input terminal of the third branch 200 is electrically connected to both the input terminal of the first branch 110 and the input terminal of the second branch 120, and is configured to receive the working power supply VDD, a second input terminal of the third branch 200 is configured to receive an input signal EN, an output terminal of the third branch 200 is electrically connected to the input terminal of the output module 300, and a ground terminal of the third branch 200 is electrically connected to the fixed potential terminal;
the third branch circuit 200 is configured to generate a third current I3 that is a mirror image of the first current I1 when the potential of the operating power supply VDD exceeds the first preset threshold, and is configured to pull down the potential of the output terminal of the third branch circuit 200 to the potential of the fixed potential terminal when the amplitude of the input signal EN is greater than or equal to a second preset threshold;
the output module 300 is configured to output an enable signal when the potential of the output end of the third branch 200 is pulled down to the potential of the fixed potential end.
In fig. 3, VO represents an output terminal of the enable control circuit, where the input signal EN is used to control a state of the third branch circuit 200, and specifically, when the input signal EN reaches or exceeds a second preset threshold, the third branch circuit 200 pulls down a potential of the output terminal to a potential of the fixed potential terminal, and when a potential of the input terminal of the output module 300 is equal to the potential of the fixed potential terminal, the enable control circuit outputs an effective enable signal.
In this embodiment, since the first branch circuit 110 and the second branch circuit 120 have the same positive temperature coefficient or the same negative temperature coefficient, the influence of temperature variation on the current generated in the first branch circuit 110, the second branch circuit 120 and the third branch circuit 200 is eliminated.
In order to realize that the first branch circuit 110 and the second branch circuit 120 have both positive temperature coefficients or both negative temperature coefficients, the first branch circuit 110 includes a first temperature compensation device;
the second branch 120 comprises a second temperature compensation device.
The amplitudes of the first current I1 and the second current I2 are determined by the difference between the voltage drop at two ends of the second temperature compensation device and the voltage drop between the control end and the output end of the first temperature compensation device, and the first temperature compensation device and the second temperature compensation device are both negative temperature coefficient devices or both positive temperature coefficient devices.
In this embodiment, since the first temperature compensation device and the second temperature compensation device are both negative temperature coefficient devices or both positive temperature coefficient devices, the first branch circuit 110 and the second branch circuit 120 are both positive temperature coefficients or both negative temperature coefficients.
And since the amplitude of the first current I1 is determined by the difference between the voltage drop across the second temperature compensation device and the voltage drop between the control terminal and the output terminal of the first temperature compensation device, regardless of the operating power supply VDD, the influence of the operating power supply VDD on the currents generated in the first branch circuit 110, the second branch circuit 120 and the third branch circuit 200 is eliminated.
In addition, in an embodiment of the present application, the third branch includes a control device, a control terminal of the control device is used as the second input terminal of the third branch 200, and an output terminal of the control device is used as the ground terminal GND of the third branch 200; the control device is configured to pull down the potential of the output end of the third branch 200 to the potential of the fixed potential end when the amplitude of the input signal is greater than or equal to a second preset threshold, and the control device and the first temperature compensation device are devices of the same process.
Therefore, when the amplitude of the input signal is greater than or equal to a second preset threshold, the control device in the third branch pulls down the potential of the output end of the third branch, so that the output module of the enable control circuit outputs an enable signal.
In this embodiment, the fact that the potential of the fixed potential terminal is smaller than the potential of the operating power supply VDD means that the potential of the fixed potential terminal is smaller than the potential of the operating power supply VDD at any time, and optionally, the fixed potential terminal may be a zero potential terminal or a negative potential terminal as long as the potential of the fixed potential terminal is ensured to be smaller than the potential of the operating power supply VDD.
The first current generated by the first branch circuit 110 is determined by the first temperature compensation device and the second temperature compensation device, specifically, the amplitude of the first current generated by the first branch circuit 110 is determined by the difference between the voltage drop across the second temperature compensation device and the voltage drop between the control end and the output end of the first temperature compensation device, and since the first temperature compensation device and the second temperature compensation device are both negative temperature coefficient devices or both positive temperature coefficient devices, that is, the voltage drop between the control end and the output end of the first temperature compensation device and the voltage drop across the second temperature compensation device have the same trend of changing with temperature, the fluctuation of the first current caused by temperature change can be eliminated or reduced;
because the second current and the third current are both images of the first current, the fluctuation of the second current and the third current caused by temperature change can be eliminated or reduced;
still referring to fig. 3, before the amplitude of the input signal EN reaches the second preset threshold, the control device does not pull down the potential of the output terminal of the third branch 200 to the potential of the fixed potential terminal, at this time, the potential of the output terminal of the third branch 200 is the same as the potential of the operating power supply VDD, when receiving a high level equal to the potential of the operating power supply VDD, the output module 300 does not output a valid enable signal, when the amplitude of the input signal EN reaches or exceeds the second preset threshold, the control device pulls down the potential of the output end of the third branch 200 to the potential of the fixed potential end, at this time, the potential of the input end of the output module 300 is the potential of the fixed potential end, at this time, an effective enable signal is output, and accordingly, the second preset threshold is the flip level of the enable control circuit.
Since the control device for pulling down the output terminal potential of the third branch 200 has the same process as the first temperature compensation device, the influence of the device process corner on the flip level of the enable control circuit is eliminated or reduced.
A description is given below of possible structures of the respective branches or modules of the enable control circuit provided in the embodiments of the present application.
On the basis of the above embodiment, in an embodiment of the present application, still referring to fig. 3, the first branch includes: a first transistor M1, a second transistor M2, a load unit 111; wherein,
a control terminal of the first transistor M1 is electrically connected to an input terminal of the second temperature compensation device, an output terminal of the first transistor M1 is electrically connected to an input terminal of the load unit 111, an input terminal of the first transistor M1 is electrically connected to a control terminal of the second transistor M2 and an output terminal of the second transistor M2, and an input terminal of the second transistor M2 is an input terminal of the first branch;
the output end of the load unit 111 is electrically connected with the fixed potential end;
the first transistor M1 is an N-type depletion MOS transistor, the first transistor M1 is the first temperature compensation device, and the first temperature compensation device is a negative temperature coefficient device;
the second transistor M2 is a P-type enhancement MOS transistor.
The second branch circuit includes: a fourth transistor M4 and a first diode D1; wherein,
a control terminal of the fourth transistor M4 is electrically connected to a control terminal of the second transistor M2, an input terminal of the fourth transistor M4 is electrically connected to an input terminal of the second transistor M2, and an output terminal of the fourth transistor M4 is electrically connected to a control terminal of the first transistor M1 and an input terminal of the first diode D1;
the output end of the first diode D1 is electrically connected with the fixed potential end, the first diode D1 is used as the second temperature compensation device, and the second temperature compensation device is a negative temperature coefficient device;
the fourth transistor M4 is a P-type enhancement MOS transistor.
The third branch comprises a third transistor M3 and a fifth transistor M5; wherein,
a control terminal of the third transistor M3 is electrically connected to a control terminal of the second transistor M2, an input terminal of the third transistor M3 is electrically connected to an input terminal of the second transistor M2 as an input terminal of the third branch, and an output terminal of the third transistor M3 is electrically connected to an input terminal of the fifth transistor M5;
the control end of the fifth transistor M5 is used for receiving the input signal;
an output terminal of the fifth transistor M5 is electrically connected to the fixed potential terminal, and the fifth transistor M5 is the control device;
the third transistor M3 is a P-type enhancement MOS transistor, and the fifth transistor M5 is an N-type enhancement MOS transistor.
In fig. 3, the control terminals of the first transistor M1 and the fifth transistor M5 are gates, the input terminal is a drain, and the output terminal is a source; the control ends of the second transistor M2, the third transistor M3 and the fourth transistor M4 are gates, the input end is a source, and the output end is a drain.
In this embodiment, the first branch and the second branch jointly form a current source generating module, when the circuit starts to power up, the voltage at the node V1 in fig. 3 is 0, since the first transistor M1 is an N-type depletion MOS transistor, and its threshold voltage is less than 0, the first transistor M1 is in a conducting state, as the power-up process proceeds, the voltage of the operating power supply gradually increases, when the voltage of the operating voltage is greater than the threshold voltage of the second transistor M2, since the magnitude of the gate-source voltage of the second transistor M2 is equal to the voltage magnitude of the operating voltage, the branch in which the second transistor M2 is located (i.e. the first branch) is conducting, since the fourth transistor M4 of the second branch and the third transistor M3 of the third branch are mirror images of the second transistor M2, the second branch and the third branch are conducting, and the whole circuit starts to work normally, as can be seen from the above description, the circuit shown in fig. 3 can be self-activated, and the first predetermined threshold is the threshold voltage of the second transistor M2.
When the width-to-length ratio of the second transistor M2 and the third transistor M3 is 1, the first current, the second current, and the third current are determined by the following logarithmic equations:
wherein I is the first, second and third currents, k is the Boltzmann constant, T is the absolute temperature, I0Is the reverse leakage current, g, of the first diode D1m1Is the transconductance of the first transistor M1. The above equation is difficult to solve and the current of the second transistor M2 can be calculated by approximationExpressed as:
wherein, VbeIs the voltage drop across the first diode D1, VGS1Is the gate-source voltage, R, of the first transistor M11+R2Representing the total resistance of the load cell 111.
Since the voltage drop across the first diode D1 and the gate-source voltage of the first transistor M1 are both negative temperature coefficients, the voltage drop across the first diode D1 and the gate-source voltage of the first transistor M1 have the same trend of changing with temperature, so that the first current can be temperature compensated, and the change of the first current with temperature can be reduced or eliminated.
Since the second and third currents are mirror images of the first current, the variation of the second and third currents with temperature may be reduced or eliminated for the same reason.
In the circuit configuration shown in fig. 3, the first transistor M1, the second transistor M2, and the fourth transistor M4 form a positive feedback loop, and if the channel length modulation effect is neglected, the loop gain is:
wherein, VTIs the threshold voltage, g, of the first transistor M1m4Is the transconductance of the fourth transistor M4, gm2I represents the first current, the second current, or the third current, which is the transconductance of the second transistor M2.
In order to reduce power consumption, the total resistance of the load unit 111 is large, and therefore the loop gain is smaller than 1.
Considering that the first temperature compensation device of the current source generation module is an N-type device, in order to reduce the influence of the process corner on the inversion level, the fifth transistor M5 also adopts an N-type device, so that the parameters of the fifth transistor M5 and the parameters of the first transistor M1 have the same trend with the process corner, and the influence of the process corner on the inversion level is eliminated or reduced.
When the input signal received by the fifth transistor M5 is greater than or equal to the second preset threshold, the gate-source voltage of the fifth transistor M5 meets the turn-on requirement, the fifth transistor M5 is turned on, so that the potential of the output terminal of the third branch is pulled down to the potential of the fixed potential terminal, and the output module starts outputting an effective enable signal, as can be seen from the above description, the second preset threshold is the threshold voltage of the fifth transistor M5.
Assuming that the width-to-length ratio of the second transistor M2 and the third transistor M3 is 1, there are:
then correspondingly, the flipping level (i.e. the second preset threshold) is:
wherein Vtn is the threshold voltage of the fourth transistor M4, μnFor electron mobility, W and L are the width and length of the fourth transistor M4, respectively, and Cox is the gate capacitance per unit area.
Optionally, the output module may be an inverter, so that before the output terminal of the third branch is pulled down to the potential of the fixed potential terminal, an input of the inverter is at a high level (i.e., the working power supply potential), and outputs a low level (i.e., an inactive enable signal) after inversion, and after the output terminal of the third branch is pulled down to the potential of the fixed potential terminal, an input of the inverter is at a low level (i.e., the potential of the fixed potential terminal), and outputs a high level (i.e., an active enable signal) after inversion.
On the basis of the above-described embodiment, in another embodiment of the present application, as shown in fig. 4, the load unit 111 further includes an intermediate potential terminal;
the substrate of the fifth transistor M5 is electrically connected to the terminal of intermediate potential so that the output signal of the terminal of intermediate potential provides the substrate bias potential for the fifth transistor M5.
Wherein, still referring to fig. 4, the load unit 111 includes a first resistor R1 and a second resistor R2; wherein,
one end of the second resistor R2 is electrically connected with the output end of the first transistor M1, and the other end is connected with the first end of the first resistor R1;
the other end of the first resistor R1 is electrically connected with the fixed potential end;
and the connection node of the first resistor R1 and the second resistor R2 is the intermediate potential end.
The intermediate potential terminal is used for providing a substrate bias potential for the fifth transistor M5, so that a substrate bias effect exists in the fifth transistor M5, the phenomenon that a field induction junction and a source-substrate junction of the fifth transistor M5 are forward biased is avoided, and the situation that the fifth transistor M5 fails due to the phenomenon is avoided.
Similarly, in fig. 4, the control terminals of the first transistor M1 and the fifth transistor M5 are gates, the input terminal is a drain, and the output terminal is a source; the control ends of the second transistor M2, the third transistor M3 and the fourth transistor M4 are gates, the input end is a source, and the output end is a drain.
Accordingly, when the load cell 111 is composed of the first resistor R1 and the second resistor R2, R in formulas (1) to (5)1I.e. the resistance value of said first resistor R1, R2I.e. the resistance of said second resistor R2.
Correspondingly, an embodiment of the present application further provides an electronic device, including the enable control circuit according to any of the above embodiments.
To sum up, the embodiment of the present application provides an enable control circuit and an electronic device, wherein, the enable control circuit includes: the current source generating module comprises a first branch circuit and a second branch circuit, the third current generated in the third branch circuit and the first current generated in the first branch circuit are mirror images of each other, since the magnitude of the current generated in the first branch is determined by the difference between the voltage drop across the second temperature compensation device and the voltage drop between the control terminal and the output terminal of the first temperature compensation device, and the first temperature compensation device and the second temperature compensation device are both negative temperature coefficient devices or positive temperature coefficient devices, so that the influence of temperature change on the current generated in the first branch circuit, the second branch circuit and the third branch circuit is eliminated, the amplitude of the first current is irrelevant to the working power supply, so that the influence of the working power supply on the currents generated in the first branch circuit, the second branch circuit and the third branch circuit is eliminated;
in addition, when the amplitude of the input signal is greater than or equal to a second preset threshold, the control device in the third branch pulls down the potential of the output end of the third branch, so that the output module of the enable control circuit outputs an enable signal.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (12)
1. An enable control circuit, comprising: the current source generating module, the third branch circuit and the output module; wherein,
the current source generation module includes: the input end of the first branch circuit is electrically connected with the input end of the second branch circuit, and the input end of the first branch circuit is used for receiving a working power supply; the output end of the first branch circuit is electrically connected with the output end of the second branch circuit and a fixed potential end, and the potential of the fixed potential end is smaller than that of the working power supply;
the first branch circuit is used for generating a first current when the potential of the working power supply exceeds a first preset threshold;
the second branch circuit is used for generating a second current which is a mirror image of the first current when the potential of the working power supply exceeds a first preset threshold; the first branch circuit and the second branch circuit are both positive temperature coefficients or both negative temperature coefficients;
the first input end of the third branch is electrically connected with the input end of the first branch and the input end of the second branch and is used for receiving the working power supply, the second input end of the third branch is used for receiving an input signal, the output end of the third branch is electrically connected with the input end of the output module, and the grounding end of the third branch is electrically connected with the fixed potential end;
the third branch circuit is used for generating a third current which is a mirror image of the first current when the potential of the working power supply exceeds the first preset threshold value, and is used for pulling down the potential of the output end of the third branch circuit to be the potential of the fixed potential end when the amplitude of the input signal is greater than or equal to a second preset threshold value;
and the output module is used for outputting an enable signal when the potential of the output end of the third branch circuit is pulled down to the potential of the fixed potential end.
2. The enable control circuit of claim 1, wherein the first branch comprises a first temperature compensation device;
the second branch comprises a second temperature compensation device;
the amplitudes of the first current and the second current are determined by the difference between the voltage drop at the two ends of the second temperature compensation device and the voltage drop between the control end and the output end of the first temperature compensation device, and the first temperature compensation device and the second temperature compensation device are both negative temperature coefficient devices or both positive temperature coefficient devices.
3. The enable control circuit of claim 2, wherein the third branch comprises a control device;
the control end of the control device is used as the second input end of the third branch circuit, and the output end of the control device is used as the grounding end of the third branch circuit; and the control device is used for pulling down the potential of the output end of the third branch circuit to the potential of the fixed potential end when the amplitude of the input signal is greater than or equal to a second preset threshold value.
4. The enable control circuit of claim 3, wherein the control device and the first temperature compensation device are devices of the same process.
5. The enable control circuit of claim 3, wherein the first branch comprises: a first transistor, a second transistor, a load unit; wherein,
the control end of the first transistor is electrically connected with the input end of the second temperature compensation device, the output end of the first transistor is electrically connected with the input end of the load unit, the input end of the first transistor is electrically connected with the control end of the second transistor and the output end of the second transistor, and the input end of the second transistor is the input end of the first branch circuit;
the output end of the load unit is electrically connected with the fixed potential end;
the first transistor is an N-type depletion MOS (metal oxide semiconductor) tube, the first transistor is a first temperature compensation device, and the first temperature compensation device is a negative temperature coefficient device;
the second transistor is a P-type enhancement type MOS transistor.
6. The enable control circuit of claim 5, wherein the second branch comprises: a fourth transistor and a first diode; wherein,
the control end of the fourth transistor is electrically connected with the control end of the second transistor, the input end of the fourth transistor is electrically connected with the input end of the second transistor, and the output end of the fourth transistor is electrically connected with the control end of the first transistor and the input end of the first diode;
the output end of the first diode is electrically connected with the fixed potential end, the first diode is used as the second temperature compensation device, and the second temperature compensation device is a negative temperature coefficient device;
the fourth transistor is a P-type enhancement MOS tube.
7. The enable control circuit of claim 5, wherein the third branch comprises a third transistor and a fifth transistor; wherein,
a control end of the third transistor is electrically connected with a control end of the second transistor, an input end of the third transistor is electrically connected with an input end of the second transistor and serves as an input end of the third branch, and an output end of the third transistor is electrically connected with an input end of the fifth transistor;
the control end of the fifth transistor is used for receiving the input signal;
the output end of the fifth transistor is electrically connected with the fixed potential end, and the fifth transistor is the control device;
the third transistor is a P-type enhancement type MOS transistor, and the fifth transistor is an N-type enhancement type MOS transistor.
8. The enable control circuit of claim 7, wherein the first preset threshold is a threshold voltage of the second transistor;
the second preset threshold is a threshold voltage of the fifth transistor.
9. The enable control circuit of claim 7, wherein the load cell further comprises a first resistor and a second resistor; wherein,
one end of the second resistor is electrically connected with the output end of the first transistor, and the other end of the second resistor is connected with the first end of the first resistor;
the other end of the first resistor is electrically connected with the fixed potential end;
the connection node of the first resistor and the second resistor is an intermediate potential end;
the substrate of the fifth transistor is electrically connected to the terminal of intermediate potential so that the output signal of the terminal of intermediate potential provides a substrate bias potential for the fifth transistor.
10. The enable control circuit according to claim 1, wherein the fixed potential terminal is a zero potential terminal.
11. The enable control circuit of claim 1, wherein the output module is an inverter.
12. An electronic device comprising an enable control circuit according to any one of claims 1-11.
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