CN114326917B - Current reference temperature compensation circuit - Google Patents
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Abstract
The invention discloses a current reference temperature compensation circuit, which comprises an output current mirror, at least one positive segment compensation current circuit and at least one negative segment compensation current circuit; each positive segment compensation current circuit and each negative segment compensation current circuit are connected with the input end of the output current mirror; the positive segment compensation current circuit is used for carrying out current injection on the input end of the output current mirror when the temperature reaches and exceeds the set positive segment compensation temperature, and the current injected into the input end of the output current mirror by the positive segment compensation current circuit increases along with the temperature increase; the negative segment compensation current circuit is used for carrying out current drawing on the input end pair of the output current mirror when the temperature reaches and exceeds the set negative segment compensation temperature, and the current drawn by the negative segment compensation current circuit on the input end of the output current mirror increases along with the temperature. The invention has the advantages of simple circuit structure, strong expandability and capability of designating the temperature coefficient of any temperature section.
Description
Technical Field
The invention relates to the field of integrated circuits, in particular to a current reference temperature compensation circuit.
Background
Current reference temperature compensation circuits are typically required to have a near zero temperature coefficient in the field of analog integrated circuit design, while current reference temperature compensation circuits are typically required to have a higher temperature coefficient in the field of radio frequency integrated circuit design. Therefore, in the prior art, corresponding current reference temperature compensation circuits are usually developed according to different application environments, and the development and design are troublesome.
Disclosure of Invention
The invention aims to provide a current reference temperature compensation circuit which has the advantages of simple circuit structure, strong expandability and capability of specifying the temperature coefficient of any temperature section.
In order to achieve the above object, the solution of the present invention is:
a current reference temperature compensation circuit comprising an output current mirror, at least one positive segment compensation current circuit, at least one negative segment compensation current circuit; each positive segment compensation current circuit and each negative segment compensation current circuit are connected with the input end of the output current mirror; the positive segment compensation current circuit is used for carrying out current injection on the input end of the output current mirror when the temperature reaches and exceeds the set positive segment compensation temperature, and the current injected into the input end of the output current mirror by the positive segment compensation current circuit increases along with the temperature increase; the negative segment compensation current circuit is used for carrying out current drawing on the input end pair of the output current mirror when the temperature reaches and exceeds the set negative segment compensation temperature, and the current drawn by the negative segment compensation current circuit on the input end of the output current mirror increases along with the temperature.
The current reference temperature compensation circuit also comprises an initial current source, and the output end of the initial current source is connected with the input end of the output current mirror.
The positive segmentation compensation current circuit comprises a positive segmentation low-temperature current source, a positive segmentation high-temperature current source, a first positive segmentation current mirror, a second positive segmentation current mirror, a third positive segmentation current mirror and a positive segmentation diode circuit; the temperature coefficient of the positive segmentation high-temperature current source is larger than that of the positive segmentation low-temperature current source, the first positive segmentation current mirror is a P-type current mirror, and the second positive segmentation current mirror and the third positive segmentation current mirror are N-type current mirrors; the input end of the positive segmentation high-temperature current source, the input end of the positive segmentation low-temperature current source and the power end of the first positive segmentation current mirror are connected with a power supply, the output end of the positive segmentation high-temperature current source is connected with the input end of the second positive segmentation current mirror, the output end of the second positive segmentation current mirror is connected with the input end of the first positive segmentation current mirror, the output end of the positive segmentation low-temperature current source is connected with the input end of the third positive segmentation current mirror, the output end of the third positive segmentation current mirror and the output end of the first positive segmentation current mirror are connected with the positive electrode of the positive segmentation diode circuit, the negative electrode of the positive segmentation diode circuit is connected with the input end of the output current mirror, and the grounding ends of the second positive segmentation current mirror and the third positive segmentation current mirror are grounded.
The positive segment diode circuit is a positive segment NPN triode adopting a diode connection mode.
The negative segment compensation current circuit comprises a negative segment high-temperature current source, a negative segment low-temperature current source, a first negative segment current mirror, a second negative segment current mirror, a third negative segment current mirror and a negative segment diode circuit; the temperature coefficient of the negative-segment low-temperature current source is smaller than that of the negative-segment high-temperature current source, the first negative-segment current mirror is a P-type current mirror, and the second negative-segment current mirror and the third negative-segment current mirror are N-type current mirrors; the input end of the negative segmentation low-temperature current source, the input end of the negative segmentation high-temperature current source and the power end of the first negative segmentation current mirror are connected with a power supply, the output end of the negative segmentation low-temperature current source is connected with the input end of the second negative segmentation current mirror, the output end of the second negative segmentation current mirror is connected with the input end of the first negative segmentation current mirror, the output end of the negative segmentation high-temperature current source is connected with the input end of the third negative segmentation current mirror, the output end of the third negative segmentation current mirror and the output end of the first negative segmentation current mirror are connected with the negative electrode of the negative segmentation diode circuit, the positive electrode of the negative segmentation diode circuit is connected with the input end of the output current mirror, and the grounding ends of the second negative segmentation current mirror and the third negative segmentation current mirror are grounded.
The negative segment diode circuit is a negative segment NPN triode adopting a diode connection mode.
The positive segment compensation current circuits and the negative segment compensation current circuits are the same in number, and one positive segment compensation current circuit and one negative segment compensation current circuit form a current compensation unit; the positive segmentation compensation current circuit comprises a positive segmentation low-temperature current source, a positive segmentation high-temperature current source, a first positive segmentation current mirror, a second positive segmentation current mirror, a third positive segmentation current mirror, a fourth positive segmentation current mirror and a positive segmentation diode circuit; the negative segment compensation current circuit comprises a negative segment low-temperature current source, a first negative segment current mirror, a second negative segment current mirror and a negative segment diode circuit; the temperature coefficient of the positive segmentation high-temperature current source is larger than that of the positive segmentation low-temperature current source, the temperature coefficient of the negative segmentation low-temperature current source is lower than that of the positive segmentation high-temperature current source, the first positive segmentation current mirror, the fourth positive segmentation current mirror and the first negative segmentation current mirror are P-type current mirrors, and the second positive segmentation current mirror, the third positive segmentation current mirror and the second negative segmentation current mirror are N-type current mirrors; in a current compensation unit, the input end of the positive segmentation high-temperature current source, the input end of the positive segmentation low-temperature current source, the power end of the first positive segmentation current mirror, the power end of the fourth positive segmentation current mirror, the input end of the negative segmentation low-temperature current source and the power end of the first negative segmentation current mirror are connected with a power supply, the output end of the positive segmentation high-temperature current source is connected with the input end of the second positive segmentation current mirror, the output end of the second positive segmentation current mirror is connected with the input end of the first positive segmentation current mirror and the positive electrode of the negative segmentation diode circuit, and the output end of the positive segmentation low-temperature current source is connected with the input end of the third positive segmentation current mirror; the output end of the first positive segmentation current mirror and the output end of the third positive segmentation current mirror are connected with the positive electrode of the positive segmentation diode circuit, the output end of the third positive segmentation current mirror is also connected with the input end of the fourth positive segmentation current mirror, the negative electrode of the positive segmentation diode circuit and the output end of the fourth positive segmentation current mirror are connected with the input end of the output current mirror, the output end of the negative segmentation low-temperature current source is connected with the input end of the second negative segmentation current mirror, the output end of the second negative segmentation current mirror is also connected with the negative electrode of the negative segmentation diode circuit, the positive electrode of the negative segmentation diode circuit is connected with the input end of the output current mirror, and the grounding of the second positive segmentation current mirror, the third positive segmentation current mirror and the second negative segmentation current mirror is grounded.
The output current mirror is an N-type current mirror or a P-type current mirror.
The N-type current mirror comprises a first resistor, a first NMOS tube, a second NMOS tube, a third NMOS tube and a fourth NMOS tube; the first end of the first resistor is connected with the grid electrode of the first NMOS tube and the grid electrode of the second NMOS tube and is used as the input end of the N-type current mirror, the second end of the first resistor is connected with the drain electrode of the first NMOS tube, the grid electrode of the third NMOS tube and the grid electrode of the fourth NMOS tube, the source electrode of the first NMOS tube is connected with the drain electrode of the third NMOS tube, the drain electrode of the second NMOS tube is used as the output end of the N-type current mirror, the source electrode of the second NMOS tube is connected with the drain electrode of the fourth NMOS tube, and the source electrode of the third NMOS tube is connected with the source electrode of the fourth NMOS tube and is used as the grounding end of the N-type current mirror.
The P-type current mirror comprises a second resistor, a first PMOS tube, a second PMOS tube, a third PMOS tube and a fourth PMOS tube; the source electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube and is used as the power end of the P-type current mirror, the grid electrode of the first PMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the third PMOS tube and the first end of the second resistor, the drain electrode of the first PMOS tube is connected with the source electrode of the third PMOS tube, the drain electrode of the second PMOS tube is connected with the source electrode of the fourth PMOS tube, the grid electrode of the third PMOS tube is connected with the grid electrode of the fourth PMOS tube and the second end of the second resistor and is used as the input end of the P-type current mirror, and the drain electrode of the fourth PMOS tube is used as the output end of the P-type current mirror.
After the scheme is adopted, the positive segment compensation current circuit is used for carrying out current pouring on the input end of the output current mirror to improve the temperature coefficient of the output current mirror when the temperature reaches and exceeds the set positive segment compensation temperature, and the negative segment compensation current circuit is used for carrying out current pulling on the input end pair of the output current mirror to reduce the temperature coefficient of the output current mirror when the temperature reaches and exceeds the set negative segment compensation temperature; the invention can realize the function of specifying the temperature coefficient of any temperature section by selecting different numbers of positive segmentation compensation current circuits and negative segmentation compensation current circuits, and has simple circuit structure and strong expandability.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a positive segment compensation current circuit according to a first embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of a negative segment compensation current circuit according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram showing the temperature characteristics of the output current mirror according to the first embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a second embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a third embodiment of the present invention;
fig. 7 is a schematic diagram showing the temperature characteristics of the output current mirror according to the third embodiment of the present invention;
FIG. 8 is a schematic circuit diagram of an N-type current mirror of the present invention;
fig. 9 is a schematic circuit diagram of a P-type current mirror of the present invention.
Detailed Description
As shown in fig. 1 to 9, the present invention discloses a current reference temperature compensation circuit, which comprises an output current mirror Ia, at least one positive segment compensation current circuit 1, at least one negative segment compensation current circuit 2; each positive segment compensation current circuit 1 and each negative segment compensation current circuit 2 are connected with the input end of the output current mirror Ia; the positive segment compensation current circuit 1 is used for carrying out current injection on the input end of the output current mirror Ia when the temperature reaches and exceeds the set positive segment compensation temperature, and the current injected by the positive segment compensation current circuit 1 on the input end of the output current mirror Ia increases along with the temperature; the negative segment compensation current circuit 2 is used for carrying out current drawing on the input end pair of the output current mirror Ia when the temperature reaches and exceeds the set negative segment compensation temperature, and the current drawn by the negative segment compensation current circuit 2 on the input end of the output current mirror Ia increases with the temperature.
The positive segment compensation current circuit 1 is used for carrying out current pouring on the input end of the output current mirror Ia to improve the temperature coefficient of the output current mirror Ia when the temperature reaches and exceeds the set positive segment compensation temperature, and the negative segment compensation current circuit 2 is used for carrying out current pulling on the input end pair of the output current mirror Ia to reduce the temperature coefficient of the output current mirror Ia when the temperature reaches and exceeds the set negative segment compensation temperature; the invention can realize the function of specifying the temperature coefficient of any temperature section by selecting different numbers of positive segment compensation current circuits 1 and negative segment compensation current circuits 2, and has simple circuit structure and strong expandability.
In order to further explain the technical scheme of the invention, the invention is explained in detail by specific examples.
Embodiment one:
referring to fig. 1 to fig. 4, in a first embodiment of the present invention, the number of the positive segment compensation current circuit 1 and the number of the negative segment compensation current circuit 2 are both one, the positive segment compensation temperature T1 is smaller than the negative segment compensation temperature T2, and the current reference temperature compensation circuit further includes an initial current source I0, and an output end of the initial current source I0 is connected to an input end of the output current mirror Ia; the current of the initial current source I0 is I 0 (T), T is the temperature; the output current mirror Ia is an N-type current mirror.
In the first embodiment of the present invention, the positive-segment compensation current circuit 1 includes a positive-segment low-temperature current source I1, a positive-segment high-temperature current source I2, a first positive-segment current mirror P1, a second positive-segment current mirror N1, a third positive-segment current mirror N2, and a positive-segment diode circuit; the temperature coefficient of the positive segmentation high-temperature current source I2 is larger than that of the positive segmentation low-temperature current source I1, the first positive segmentation current mirror P1 is a P-type current mirror, and the second positive segmentation current mirror N1 and the third positive segmentation current mirror N2 are N-type current mirrors; the input end of the positive segmentation high-temperature current source I2, the input end of the positive segmentation low-temperature current source I1 and the power end of the first positive segmentation current mirror P1 are connected with a power supply VDD, the output end of the positive segmentation high-temperature current source I2 is connected with the input end of the second positive segmentation current mirror N1, the output end of the second positive segmentation current mirror N1 is connected with the input end of the first positive segmentation current mirror P1, the output end of the positive segmentation low-temperature current source I1 is connected with the input end of the third positive segmentation current mirror N2, the output end of the third positive segmentation current mirror N2 and the output end of the first positive segmentation current mirror P1 are connected with the positive electrode of the positive segmentation diode circuit, the negative electrode of the positive segmentation diode circuit is connected with the input end of the output current mirror Ia, and the grounding ends of the second positive segmentation current mirror N1 and the third positive segmentation current mirror N2 are grounded; the positive segment diode circuit is a positive segment NPN triode Q1 adopting a diode connection mode.
In the positive segment compensation current circuit according to the first embodiment of the present invention, the positive segment low-temperature current source I1 provides a current output after passing through the third positive segment current mirror N2, and the current value thereof is In2 (T); the positive-segment high-temperature current source I2 provides a current output after passing through the second positive-segment current mirror N1 and the first positive-segment current mirror P1, and the current value is Ip1 (T). In2 (T) and Ip1 (T) sink current Iout1 (T) outward through the positive segmented diode circuit. Since the temperature coefficients of the positive-stage low-temperature current source I1 and the positive-stage high-temperature current source I2 are different, the values of In2 (T) and Ip1 (T) are different at the same temperature except for the set positive-stage compensation temperature T1. The first positive segment current mirror P1 and the third positive segment current mirror N2 are connected together and then compete, so that under the limited voltage margin, the current Ip1N2 (T) of the branch connected by the positive electrode of the positive segment diode circuit is the one with the small current value of In2 (T) and Ip1 (T), that is, ip1N2 (T) =min (Ip 1 (T), in2 (T)); when In2 (T) > Ip1 (T), ip1n2 (T) is subordinate to Ip1 (T), the positive-segment diode circuit is turned off, and the forward-segment diode circuit outputs a sink current Iout1 (T) =0; when Ip1 (T) > In2 (T), ip1n2 (T) is subordinate to In2 (T), the forward-segmented diode circuit is turned on, and the forward-segmented diode circuit sinks current Iout1 (T) =ip1 (T) -In2 (T) outward. The forward segmented diode circuit sink current Iout1 is therefore a piecewise function, specifically:
in the first embodiment of the present invention, the negative-segment compensation current circuit 2 includes a negative-segment high-temperature current source I3, a negative-segment low-temperature current source I4, a first negative-segment current mirror P2, a second negative-segment current mirror N3, a third negative-segment current mirror N4, and a negative-segment diode circuit; the temperature coefficient of the negative segmentation low-temperature current source I4 is smaller than that of the negative segmentation high-temperature current source I3, the first negative segmentation current mirror P2 is a P-type current mirror, and the second negative segmentation current mirror N3 and the third negative segmentation current mirror N4 are N-type current mirrors; the input end of the negative segmentation low-temperature current source I4, the input end of the negative segmentation high-temperature current source I3 and the power end of the first negative segmentation current mirror P2 are connected with a power supply VDD, the output end of the negative segmentation low-temperature current source I4 is connected with the input end of the second negative segmentation current mirror N3, the output end of the second negative segmentation current mirror N3 is connected with the input end of the first negative segmentation current mirror P2, the output end of the negative segmentation high-temperature current source I3 is connected with the input end of the third negative segmentation current mirror N4, the output end of the third negative segmentation current mirror N4 and the output end of the first negative segmentation current mirror P2 are connected with the negative electrode of the negative segmentation diode circuit, the positive electrode of the negative segmentation diode circuit is connected with the input end of the output current mirror Ia, and the grounding ends of the second negative segmentation current mirror N3 and the third negative segmentation current mirror N4 are grounded; the negative segment diode circuit is a negative segment NPN triode Q2 adopting a diode connection mode.
In the negative-segment compensation current circuit 2 according to the first embodiment of the present invention, the negative-segment low-temperature current source I4 provides a current output through the second negative-segment current mirror N3 and the first negative-segment current mirror P2, and the current value thereof is Ip2 (T); the negative-segment high-temperature current source I3 provides a current output after passing through the third negative-segment current mirror N4, and the current value is In4 (T). Ip2 (T) and In4 (T) are pulled inward by a diode circuit with current Iout2 (T). Since the negative-segment high-temperature current source I3 and the negative-segment low-temperature current source I4 are different in temperature coefficient, lp2 (T) and ln4 (T) values are different at the same temperature except for the set negative-segment compensation temperature T2. The first negative segmented current mirror P2 and the third negative segmented current mirror N4 are connected together to generate competition, and under the limited voltage margin, the current Ip2N4 (T) of the branch connected by the negative electrode of the negative segmented diode circuit is the one with the small current value of lp2 (T) and ln4 (T), namely Ip2N4 (T) =min (Ip 2 (T), in4 (T)); when Ip2 (T) > In4 (T), ip2n4 (T) is subordinate to In4 (T), the negative segmented diode circuit is turned off, and the negative segmented diode circuit pulls In current Iout2 (T) =0; when In4 (T) > Ip2 (T), the negative segmented diode circuit operates, and the negative segmented diode circuit pulls In the current Iout2 (T) =in4 (T) -Ip2 (T). The pull current Iout2 (T) is therefore a piecewise function, specifically:
in the first embodiment of the present invention, the output current Ibias of the output current mirror is:
from the above, the invention can realize three temperature sectional settings with different temperature coefficients through a positive sectional compensation current circuit 1 and a negative sectional compensation current circuit 2; therefore, the function of specifying the temperature coefficient of any temperature section can be realized by adjusting the quantity of the positive segment compensation current circuit 1 and the negative segment compensation current circuit 2, and the circuit has simple structure and strong expandability.
Embodiment two:
with reference to fig. 5, in the second embodiment of the present invention, the circuit structure of the first embodiment is optimized to simplify the circuit; in particular. In the second embodiment of the present invention, the number of the positive segment compensation current circuits 1 and the number of the negative segment compensation current circuits 2 are the same, and one positive segment compensation current circuit 1 and one negative segment compensation current circuit 2 form one temperature compensation current unit Ic; specifically, in the second embodiment of the present invention, the number of the temperature compensation current units Ic is one; the positive segment compensation current circuit 1 comprises a positive segment low-temperature current source I1, a positive segment high-temperature current source I2, a first positive segment current mirror P1, a second positive segment current mirror N1, a third positive segment current mirror N2, a fourth positive segment current mirror P3 and a positive segment diode circuit, wherein the positive segment diode circuit is also a positive segment NPN triode Q1 adopting a diode connection mode; the negative segment compensation current circuit 2 comprises a negative segment low-temperature current source I4, a first negative segment current mirror P2, a second negative segment current mirror N3 and a negative segment diode circuit, wherein the negative segment diode circuit is also a positive segment NPN triode Q2 adopting a diode connection mode; the temperature coefficient of the positive segmentation high-temperature current source I2 is larger than that of the positive segmentation low-temperature current source I1, the temperature coefficient of the negative segmentation low-temperature current source I4 is lower than that of the positive segmentation high-temperature current source I2, the first positive segmentation current mirror P1, the fourth positive segmentation current mirror P3 and the first negative segmentation current mirror P2 are P-type current mirrors, and the second positive segmentation current mirror N1, the third positive segmentation current mirror N2 and the second negative segmentation current mirror N3 are N-type current mirrors; in a temperature compensation current unit Ic, an input end of the positive segmentation high-temperature current source I2, an input end of the positive segmentation low-temperature current source I1, a power end of the first positive segmentation current mirror P1, a power end of the fourth positive segmentation current mirror P3, an input end of the negative segmentation low-temperature current source I4 and a power end of the first negative segmentation current mirror P2 are connected with a power supply VDD, an output end of the positive segmentation high-temperature current source I2 is connected with an input end of the second positive segmentation current mirror N1, an output end of the second positive segmentation current mirror N1 is connected with an input end of the first positive segmentation current mirror P1 and an anode of the negative segmentation diode circuit, and an output end of the positive segmentation low-temperature current source I1 is connected with an input end of the third positive segmentation current mirror N2; the output end of the first positive segmentation current mirror P1 and the output end of the third positive segmentation current mirror N2 are connected with the positive electrode of the positive segmentation diode circuit, the output end of the third positive segmentation current mirror N2 is also connected with the input end of the fourth positive segmentation current mirror P3, the negative electrode of the positive segmentation diode circuit and the output end of the fourth positive segmentation current mirror P3 are connected with the input end of the output current mirror Ia, the output end of the negative segmentation low-temperature current source I4 is connected with the input end of the second negative segmentation current mirror N3, the output end of the second negative segmentation current mirror N3 is also connected with the negative electrode of the negative segmentation diode circuit, the positive electrode of the negative segmentation diode circuit is connected with the input end of the output current mirror Ia, and the grounding terminals of the second positive segmentation current mirror N1, the third positive segmentation current mirror N2 and the second negative segmentation current mirror N3 are grounded; the output current mirror Ia is an N-type current mirror.
In the second embodiment of the present invention, the current output after the positive-segment low-temperature current source I1 of the positive-segment compensation current circuit 1 of the second embodiment of the present invention passes through the third positive-segment current mirror N2 and the fourth positive-segment current mirror P3 is used as the initial current source I0 in the first embodiment; the positive segment compensation current Iout1 (T) of the second embodiment is the same as that of the first embodiment.
In the second embodiment of the present invention, the current output by the positive segment high temperature current source I2 of the positive segment compensation current circuit 1 of the second embodiment of the present invention after passing through the second positive segment current mirror N1 is supplied to the negative segment compensation current circuit 2 for use, and the current output by the positive segment high temperature current source I2 of the positive segment compensation current circuit 1 of the second embodiment of the present invention after passing through the second positive segment current mirror N1 is equivalent to the negative segment high temperature current source I3 of the first embodiment, and the current value thereof is in1_2 (T). The negative-segment low-temperature current source I4 of the negative-segment compensation current circuit 2 provides a current output after passing through the second negative-segment current mirror N3 and the first negative-segment current mirror P2, and the current value is Ip2 (T). In1_2 (T) and Ip2 (T) pull-In current Iout2 (T) through the negative segmented diode. Since the negative-stage low-temperature current source I4 and the positive-stage high-temperature current source I2 are different In temperature coefficient, the values of in1_2 (T) and Ip2 (T) are different at the same temperature except for the set positive-stage compensation temperature T2. The first negative-segment current mirror P2 and the second positive-segment current mirror N1 are connected together to compete, so that under a limited voltage margin, the current ip2n1_2 (T) of the branch connected to the negative electrode of the negative-segment diode circuit is the one of in1_2 (T) and ip2 (T) with the smaller current value, that is, ip2n1_2 (T) =min (ip2 (T), in1_2 (T)); when ip2 (T) > in1_2 (T), ip2n1_2 (T) is subordinate to in1_2 (T), the negative segmented diode circuit is turned off, and the negative segmented diode circuit pulls In current Iout2 (T) =0; when in1_2 (T) > Ip2 (T), the negative segmented diode circuit operates, and the negative segmented diode circuit pulls In the current Iout2 (T) =in1_2 (T) -Ip2 (T). The pull current Iout2 (T) is therefore a piecewise function, specifically:
in the second embodiment of the present invention, the output current Ibias of the output current mirror is:
therefore, on the premise of ensuring the original function, the embodiment of the invention can reduce two current sources compared with the embodiment by multiplexing the current sources and adjusting the proportion of the current mirror, thereby greatly simplifying the circuit structure.
Embodiment III:
in the third embodiment of the present invention, as shown in fig. 6 and fig. 7, the number of the positive segment compensation current circuits 1 is extended to N, the number of the negative segment compensation current circuits 2 is extended to M, N and M are integers greater than or equal to 2, and the current reference temperature compensation circuit further includes an initial current source I0; the output current mirror Ia is an N-type current mirror. In the third embodiment of the present invention, the circuit structures of the positive segment compensation current circuit 1 and the negative segment compensation current circuit 2 are the same as those of the first embodiment.
In the third embodiment of the present invention, the present invention may provide n+m temperature segmentation points, that is, the present invention may provide n+m+1 temperature segmentation with different temperature coefficients, so as to implement the characteristics of any temperature coefficient of any temperature segment.
In the present invention, the output current mirror Ia is not limited to the N-type current mirror, and the output current mirror Ia may be a P-type current mirror.
To facilitate understanding and implementation of the present invention, a circuit design of an N-type current mirror and a P-type current mirror is provided below. Specifically, as shown in fig. 8, the N-type current mirror includes a first resistor R1, a first NMOS transistor NM1, a second NMOS transistor NM2, a third NMOS transistor NM3, and a fourth NMOS transistor NM4; the first end of the first resistor R1 is connected with the grid electrode of the first NMOS tube NM1 and the grid electrode of the second NMOS tube NM2 and is used as the input end of the N-type current mirror, the second end of the first resistor R1 is connected with the drain electrode of the first NMOS tube NM1, the grid electrode of the third NMOS tube NM3 and the grid electrode of the fourth NMOS tube NM4, the source electrode of the first NMOS tube NM1 is connected with the drain electrode of the third NMOS tube NM3, the drain electrode of the second NMOS tube NM2 is used as the output end of the N-type current mirror, the source electrode of the second NMOS tube NM2 is connected with the drain electrode of the fourth NMOS tube NM4, and the source electrode of the third NMOS tube NM3 is connected with the source electrode of the fourth NMOS tube NM4 and is used as the grounding end of the N-type current mirror. With reference to fig. 9, the P-type current mirror includes a second resistor R2, a first PMOS tube PM1, a second PMOS tube PM2, a third PMOS tube PM3, and a fourth PMOS tube PM4; the source electrode of the first PMOS tube PM1 is connected with the source electrode of the second PMOS tube PM2 and is used as a power end of the P-type current mirror, the grid electrode of the first PMOS tube PM1 is connected with the grid electrode of the second PMOS tube PM2, the drain electrode of the third PMOS tube PM3 and the first end of the second resistor R2, the drain electrode of the first PMOS tube PM1 is connected with the source electrode of the third PMOS tube PM3, the drain electrode of the second PMOS tube PM2 is connected with the source electrode of the fourth PMOS tube PM4, the grid electrode of the third PMOS tube PM3 is connected with the grid electrode of the fourth PMOS tube PM4 and the second end of the second resistor R2 and is used as an input end of the P-type current mirror, and the drain electrode of the fourth PMOS tube PM4 is used as an output end of the P-type current mirror.
The above examples and drawings are not intended to limit the form or form of the present invention, and any suitable variations or modifications thereof by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (7)
1. A current reference temperature compensation circuit, characterized by: comprises an output current mirror, at least one positive segment compensation current circuit and at least one negative segment compensation current circuit; each positive segment compensation current circuit and each negative segment compensation current circuit are connected with the input end of the output current mirror;
the positive segment compensation current circuit is used for carrying out current injection on the input end of the output current mirror when the temperature reaches and exceeds the set positive segment compensation temperature, and the current injected into the input end of the output current mirror by the positive segment compensation current circuit increases along with the temperature increase;
the negative segment compensation current circuit is used for carrying out current pulling on the input end pair of the output current mirror when the temperature reaches and exceeds the set negative segment compensation temperature, and the current pulled by the negative segment compensation current circuit on the input end of the output current mirror increases along with the temperature increase;
the output current mirror is an N-type current mirror or a P-type current mirror;
the N-type current mirror comprises a first resistor, a first NMOS tube, a second NMOS tube, a third NMOS tube and a fourth NMOS tube; the first end of the first resistor is connected with the grid electrode of the first NMOS tube and the grid electrode of the second NMOS tube and is used as the input end of the N-type current mirror, the second end of the first resistor is connected with the drain electrode of the first NMOS tube, the grid electrode of the third NMOS tube and the grid electrode of the fourth NMOS tube, the source electrode of the first NMOS tube is connected with the drain electrode of the third NMOS tube, the drain electrode of the second NMOS tube is used as the output end of the N-type current mirror, the source electrode of the second NMOS tube is connected with the drain electrode of the fourth NMOS tube, and the source electrode of the third NMOS tube is connected with the source electrode of the fourth NMOS tube and is used as the grounding end of the N-type current mirror;
the P-type current mirror comprises a second resistor, a first PMOS tube, a second PMOS tube, a third PMOS tube and a fourth PMOS tube; the source electrode of the first PMOS tube is connected with the source electrode of the second PMOS tube and is used as the power end of the P-type current mirror, the grid electrode of the first PMOS tube is connected with the grid electrode of the second PMOS tube, the drain electrode of the third PMOS tube and the first end of the second resistor, the drain electrode of the first PMOS tube is connected with the source electrode of the third PMOS tube, the drain electrode of the second PMOS tube is connected with the source electrode of the fourth PMOS tube, the grid electrode of the third PMOS tube is connected with the grid electrode of the fourth PMOS tube and the second end of the second resistor and is used as the input end of the P-type current mirror, and the drain electrode of the fourth PMOS tube is used as the output end of the P-type current mirror.
2. A current reference temperature compensation circuit according to claim 1, wherein: the output end of the initial current source is connected with the input end of the output current mirror.
3. A current reference temperature compensation circuit according to claim 2, wherein: the positive segmentation compensation current circuit comprises a positive segmentation low-temperature current source, a positive segmentation high-temperature current source, a first positive segmentation current mirror, a second positive segmentation current mirror, a third positive segmentation current mirror and a positive segmentation diode circuit; the temperature coefficient of the positive segmentation high-temperature current source is larger than that of the positive segmentation low-temperature current source, the first positive segmentation current mirror is a P-type current mirror, and the second positive segmentation current mirror and the third positive segmentation current mirror are N-type current mirrors;
the input end of the positive segmentation high-temperature current source, the input end of the positive segmentation low-temperature current source and the power end of the first positive segmentation current mirror are connected with a power supply, the output end of the positive segmentation high-temperature current source is connected with the input end of the second positive segmentation current mirror, the output end of the second positive segmentation current mirror is connected with the input end of the first positive segmentation current mirror, the output end of the positive segmentation low-temperature current source is connected with the input end of the third positive segmentation current mirror, the output end of the third positive segmentation current mirror and the output end of the first positive segmentation current mirror are connected with the positive electrode of the positive segmentation diode circuit, the negative electrode of the positive segmentation diode circuit is connected with the input end of the output current mirror, and the grounding ends of the second positive segmentation current mirror and the third positive segmentation current mirror are grounded.
4. A current reference temperature compensation circuit according to claim 3, wherein: the positive segment diode circuit is a positive segment NPN triode adopting a diode connection mode.
5. A current reference temperature compensation circuit according to claim 2, wherein: the negative segment compensation current circuit comprises a negative segment high-temperature current source, a negative segment low-temperature current source, a first negative segment current mirror, a second negative segment current mirror, a third negative segment current mirror and a negative segment diode circuit; the temperature coefficient of the negative-segment low-temperature current source is smaller than that of the negative-segment high-temperature current source, the first negative-segment current mirror is a P-type current mirror, and the second negative-segment current mirror and the third negative-segment current mirror are N-type current mirrors;
the input end of the negative segmentation low-temperature current source, the input end of the negative segmentation high-temperature current source and the power end of the first negative segmentation current mirror are connected with a power supply, the output end of the negative segmentation low-temperature current source is connected with the input end of the second negative segmentation current mirror, the output end of the second negative segmentation current mirror is connected with the input end of the first negative segmentation current mirror, the output end of the negative segmentation high-temperature current source is connected with the input end of the third negative segmentation current mirror, the output end of the third negative segmentation current mirror and the output end of the first negative segmentation current mirror are connected with the negative electrode of the negative segmentation diode circuit, the positive electrode of the negative segmentation diode circuit is connected with the input end of the output current mirror, and the grounding ends of the second negative segmentation current mirror and the third negative segmentation current mirror are grounded.
6. A current reference temperature compensation circuit according to claim 5 and wherein: the negative segment diode circuit is a negative segment NPN triode adopting a diode connection mode.
7. A current reference temperature compensation circuit according to claim 1, wherein: the positive segment compensation current circuits and the negative segment compensation current circuits are the same in number, and one positive segment compensation current circuit and one negative segment compensation current circuit form a current compensation unit;
the positive segmentation compensation current circuit comprises a positive segmentation low-temperature current source, a positive segmentation high-temperature current source, a first positive segmentation current mirror, a second positive segmentation current mirror, a third positive segmentation current mirror, a fourth positive segmentation current mirror and a positive segmentation diode circuit; the negative segment compensation current circuit comprises a negative segment low-temperature current source, a first negative segment current mirror, a second negative segment current mirror and a negative segment diode circuit; the temperature coefficient of the positive segmentation high-temperature current source is larger than that of the positive segmentation low-temperature current source, the temperature coefficient of the negative segmentation low-temperature current source is lower than that of the positive segmentation high-temperature current source, the first positive segmentation current mirror, the fourth positive segmentation current mirror and the first negative segmentation current mirror are P-type current mirrors, and the second positive segmentation current mirror, the third positive segmentation current mirror and the second negative segmentation current mirror are N-type current mirrors;
in a current compensation unit, the input end of the positive segmentation high-temperature current source, the input end of the positive segmentation low-temperature current source, the power end of the first positive segmentation current mirror, the power end of the fourth positive segmentation current mirror, the input end of the negative segmentation low-temperature current source and the power end of the first negative segmentation current mirror are connected with a power supply, the output end of the positive segmentation high-temperature current source is connected with the input end of the second positive segmentation current mirror, the output end of the second positive segmentation current mirror is connected with the input end of the first positive segmentation current mirror and the positive electrode of the negative segmentation diode circuit, and the output end of the positive segmentation low-temperature current source is connected with the input end of the third positive segmentation current mirror; the output end of the first positive segmentation current mirror and the output end of the third positive segmentation current mirror are connected with the positive electrode of the positive segmentation diode circuit, the output end of the third positive segmentation current mirror is also connected with the input end of the fourth positive segmentation current mirror, the negative electrode of the positive segmentation diode circuit and the output end of the fourth positive segmentation current mirror are connected with the input end of the output current mirror, the output end of the negative segmentation low-temperature current source is connected with the input end of the second negative segmentation current mirror, the output end of the second negative segmentation current mirror is also connected with the negative electrode of the negative segmentation diode circuit, the positive electrode of the negative segmentation diode circuit is connected with the input end of the output current mirror, and the grounding of the second positive segmentation current mirror, the third positive segmentation current mirror and the second negative segmentation current mirror is grounded.
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| CN114326917A (en) | 2022-04-12 |
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