CN117978167A - Multi-operational amplifier rotation calibration method, calibration circuit and multi-channel driving system - Google Patents
Multi-operational amplifier rotation calibration method, calibration circuit and multi-channel driving system Download PDFInfo
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- CN117978167A CN117978167A CN202410383237.6A CN202410383237A CN117978167A CN 117978167 A CN117978167 A CN 117978167A CN 202410383237 A CN202410383237 A CN 202410383237A CN 117978167 A CN117978167 A CN 117978167A
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Abstract
The invention provides a multi-operational amplifier rotation calibration method, a calibration circuit and a multi-channel driving system using the same, wherein the multi-operational amplifier comprises a first operational amplifier to an N operational amplifier, and N is an integer larger than 1; when a jump edge is generated on a given clock signal, self-calibrating is sequentially carried out on the first operational amplifier to the Nth operational amplifier, and when the self-calibrating is carried out on the Kth operational amplifier, the set output signal of the wheel transfer amplifier is used as the output signal of the Kth operational amplifier; and obtaining an output signal of the rotary operational amplifier according to the input signal of the Kth operational amplifier before self-calibration of the Kth operational amplifier, wherein K is an integer which is more than 1 and less than or equal to N. The invention can calibrate a plurality of operational amplifiers in sequence in real time, eliminates the influence of temperature on offset voltage of each operational amplifier, and has simple structure.
Description
Technical Field
The invention relates to the field of power electronics, in particular to a multi-operational amplifier rotation calibration method, a calibration circuit and a multi-channel driving system.
Background
In automotive applications, multi-channel (e.g., three-channel) high-side driver chips are required to drive different types of loads, such as resistive, inductive, capacitive loads; compared with a single-channel high-side driving chip, the chip has the advantages that the number of loads which can be driven is more, and the occupied area is smaller. The chip generally needs to output a high-precision sampling current value, so that the output current can be accurately monitored on a system, and better protection is provided; in order to improve the accuracy of the sampling current, a high-accuracy sampling op-amp is required.
Because the current sampling circuits of each channel are mutually independent, in order to make the sampling precision of current/voltage higher, the sampling operational amplifier of each channel needs to be calibrated, and in the prior art, there are two main calibration modes of operational amplifier: ① Each sampling operational amplifier eliminates offset voltage in a trim mode; ② In order to ensure the continuity of sampling signals, each sampling operational amplifier eliminates offset voltage through a Ping-Pong self-zeroing calibration mode.
The offset voltage is eliminated in a trim mode, and the influence of temperature on the offset voltage cannot be offset; because trim can only be performed at a specific temperature, offset voltages at that temperature can only be eliminated. In the application, with the change of temperature, offset voltage can change, and the sampling precision is influenced by the change of the offset voltage. Each channel eliminates offset voltage through Ping-Pong self-zeroing calibration mode, each channel needs two sampling operational amplifiers to ensure that one operational amplifier can work normally when calibrating, taking 3 channels as an example, 6 sampling operational amplifiers are needed in total, the more the channels need more operational amplifiers, the more consumed chip area is, and the cost is higher.
Disclosure of Invention
The invention aims to provide a multi-operational amplifier rotation calibration method, a calibration circuit and a multi-channel driving system, which can calibrate the operational amplifier in real time, and have the advantages of simple mode and low cost.
The invention also provides a rotary calibration method of the multi-operational amplifier, which comprises a first operational amplifier to an N operational amplifier, wherein N is an integer larger than 1, when a jump edge is generated on a given clock signal, self calibration is sequentially carried out on the first operational amplifier to the N operational amplifier, and when self calibration is carried out on a K operational amplifier, a set output signal of the rotary amplifier is used as an output signal of the K operational amplifier;
And obtaining an output signal of the rotary operational amplifier according to the input signal of the Kth operational amplifier before self-calibration of the Kth operational amplifier, wherein K is an integer which is more than 1 and less than or equal to N.
Optionally, before the self calibration of the kth operational amplifier, the in-phase input signal and the anti-phase input signal of the kth operational amplifier are respectively input to the in-phase input end and the anti-phase input end of the rotary operational amplifier.
Optionally, the rotary operational amplifier is self-calibrated before the kth operational amplifier is self-calibrated.
Optionally, after the first operational amplifier is powered up to the nth operational amplifier, the first operational amplifier is initialized and calibrated to the nth operational amplifier.
Optionally, the step of self-calibrating the kth op-amp includes: and acquiring the offset voltage of the Kth operational amplifier, and compensating the input signal or/and the output signal of the Kth operational amplifier according to the offset voltage.
Optionally, when the environmental temperature of the multi-operational amplifier changes, the clock signal is set to generate a jump edge within a certain time range.
Optionally, the clock signal is set to generate transition edges at intervals.
The invention also provides a multi-operational amplifier rotary calibration circuit, which comprises a first operational amplifier, a second operational amplifier, a third operational amplifier, a fourth operational amplifier and a fifth operational amplifier, wherein N is an integer greater than 1, and comprises a rotary amplifier and N switch switching circuits, and each operational amplifier corresponds to one corresponding switch switching circuit; when a given clock signal generates a jump edge, the first operational amplifier to the N operational amplifier are sequentially self-calibrated, and when the K operational amplifier is self-calibrated, the output signal of the rotary operational amplifier is switched into the output signal of the K operational amplifier through a corresponding switch switching circuit;
before self calibration of the Kth operational amplifier, the non-inverting input signal and the inverting input signal of the Kth operational amplifier are respectively input to the non-inverting input end and the inverting input end of the rotary operational amplifier, and K is an integer which is more than 1 and less than or equal to N.
Optionally, after the first operational amplifier is powered up to the nth operational amplifier, initializing and calibrating the first operational amplifier to the nth operational amplifier; and carrying out self calibration on the rotary operational amplifier before self calibration on the Kth operational amplifier.
Optionally, each of the switch switching circuits includes a first switch and a second switch, a first end of the first switch is connected to an output end of the corresponding operational amplifier, a second end of the first switch is connected to a first end of the second switch, and a second end of the second switch is connected to an output end of the rotary operational amplifier; when the Kth operational amplifier performs self calibration, the first switch is controlled to be turned off, the second switch is turned on, and a signal output by a common connection end of the first switch tube and the second switch is used as an output signal of the Kth operational amplifier.
Optionally, when the environmental temperature of the multi-operational amplifier changes, setting the clock signal to generate a jump edge within a certain time range; or sets the clock signal to generate a transition edge at intervals.
The invention also provides a multi-channel driving system which is used for driving various types of loads, and the multi-channel driving system comprises the multi-operational amplifier rotary calibration circuit, wherein the multi-operational amplifier is respectively in one-to-one correspondence with the various types of loads, and is respectively used for sampling electric signals on the various types of loads.
Compared with the prior art, the invention has the following advantages: the invention can carry out the round-robin calibration on each operational amplifier in real time by using the round-robin operational amplifier, can effectively eliminate the influence of various environments such as temperature/humidity and the like on the offset voltage of each operational amplifier, and improves the use precision of the operational amplifier; the invention can calibrate each operational amplifier by only setting one extra rotary operational amplifier, has small occupied area of the chip and low cost, and has more operational amplifiers to be calibrated and relatively obvious advantages.
Drawings
FIG. 1 is a schematic diagram of a multi-op-amp rotary calibration circuit according to the present invention;
FIG. 2 is a waveform diagram of a cyclic calibration operation of a multi-op amplifier of the present invention;
Fig. 3 is a schematic diagram of a multi-channel drive system of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
The invention is more particularly described by way of example in the following paragraphs with reference to the drawings. It should be noted that the drawings are in a simplified form and are not to scale in order to facilitate a clear and concise description of embodiments of the present inventions.
As shown in fig. 1, a schematic diagram of a rotary calibration circuit with multiple operational amplifiers of the present invention is illustrated, wherein the multiple operational amplifiers are at least two operational amplifiers, the schematic diagram of the present invention is illustrated by taking three operational amplifiers as examples, the three operational amplifiers are sequentially A1, A2 and A3, the corresponding rotary calibration circuit comprises a rotary operational amplifier B and three switch switching circuits U1, U2 and U3, and further comprises a plurality of switches k31, k32, k33, k41, k42 and k43, and the three switch switching circuits U1, U2 and U3 sequentially connect the output ends of the operational amplifiers A1, A2 and A3 with the output end of the rotary operational amplifier B respectively. The first input end of the operational amplifier A1 receives an input signal INP1, the second input end of the operational amplifier A1 receives an input signal INN1, and the output end of the operational amplifier A1 is connected with the output end of the rotary operational amplifier B through a switch switching circuit U1; the first input end of the operational amplifier A2 receives an input signal INP2, the second input end of the operational amplifier A2 receives an input signal INN2, and the output end of the operational amplifier A2 is connected with the output end of the rotary operational amplifier B through a switch switching circuit U2; the first input end of the operational amplifier A3 receives the input signal INP3, the second input end of the operational amplifier A3 receives the input signal INN3, and the output end of the operational amplifier A3 is connected with the output end of the rotary operational amplifier B through the switch switching circuit U3. The first input terminal of the rotary op-amp B is connected to the first input terminal of the op-amp A1 (i.e., receives the input signal INP 1) through the switch k31, the first input terminal of the op-amp A2 (i.e., receives the input signal INP 2) through the switch k32, the first input terminal of the op-amp A3 (i.e., receives the input signal INP 3) through the switch k33, the second input terminal of the rotary op-amp B is connected to the second input terminal of the op-amp A1 (i.e., receives the input signal INN 1) through the switch k41, the second input terminal of the op-amp A2 (i.e., receives the input signal INN 2) through the switch k42, and the second input terminal of the op-amp A3 (i.e., receives the input signal INN 3) through the switch k 43. The switch switching circuit U1 comprises a switch k11 and a switch k21, wherein a first end of the switch k11 is connected with the output end of the operational amplifier A1, a second end of the switch k11 is connected with a first end of the switch k21, a second end of the switch k21 is connected with the output end of the wheel transfer amplifier B, and an output signal OUT1 of the connection ends of the switch k11 and the switch k21 is used as an output signal of the operational amplifier A1; the switch switching circuit U2 comprises a switch k12 and a switch k22, wherein a first end of the switch k12 is connected with the output end of the operational amplifier A1, a second end of the switch k12 is connected with a first end of the switch k22, a second end of the switch k22 is connected with the output end of the wheel transfer amplifier B, and an output signal OUT2 of the connection ends of the switch k12 and the switch k22 is used as an output signal of the operational amplifier A2; the switch switching circuit U3 comprises a switch k13 and a switch k23, a first end of the switch k13 is connected with the output end of the operational amplifier A1, a second end of the switch k13 is connected with a first end of the switch k23, a second end of the switch k23 is connected with the output end of the wheel transfer amplifier B, and an output signal OUT3 of the connection ends of the switch k13 and the switch k23 is used as an output signal of the operational amplifier A3. The principle diagram of the wheel calibration circuit is described in connection with the operational waveform diagram illustrated in fig. 2. After the multi-operational amplifier is electrified, each operational amplifier is initially calibrated, and offset voltage of each operational amplifier after initial calibration under the current temperature/environment is eliminated/compensated. After initial calibration, when a set clock signal generates a jump edge, each operational amplifier performs self calibration in sequence, taking three operational amplifiers A1, A2 and A3 illustrated in the figure as examples, the operational amplifier A1 performs self calibration first, and then the operational amplifiers A2 and A3 perform self calibration in sequence. Taking self calibration of the operational amplifier A1 as an example, before the operational amplifier A1 performs self calibration, the switch k31 and the switch k41 need to be turned on to input the input signals INP1 and INN1 of the operational amplifier A1 to the input end of the rotary operational amplifier B, that is, the first input end of the operational amplifier A1 is connected to the first input end of the rotary operational amplifier B, the second input end of the operational amplifier A1 is connected to the second input end of the rotary operational amplifier B, or the first input end of the rotary operational amplifier B receives the input signal INP1, and the second input end of the rotary operational amplifier B receives the input signal INN1, so that the output signal obtained when the rotary operational amplifier B enters the corresponding channel can be ensured to be more stable and smooth, and the output signal obtained when the operational amplifier A1 performs self calibration can still be continuous and accurate. The rotary op-amp B is also self-calibrated before the op-amp A1 is self-calibrated. When the operational amplifier A1 performs self-calibration, the switch switching circuit U1 is used for taking the output signal Vo of the rotary operational amplifier B as the output signal of the operational amplifier A1, specifically, in the switch switching circuit U1, the switch control signal TCAL 1/the control switch k11 is turned off, the switch k21 is controlled to be turned on through the switch control signal TCAL1 (opposite to the signal TCAL 1/the potential), the output signal OUT1 of the connecting end of the switch k11 and the switch k12 is equal to the output signal Vo of the wheel transfer amplifier B, namely, the output signal Vo of the wheel transfer amplifier B is taken as the output signal of the operational amplifier A1, so that the operational amplifier A1 still has an accurate output signal during self-calibration, and the output signal is ensured to be continuous and accurate before and after the self-calibration of the operational amplifier A1. The self calibration of the operational amplifier A2 and A3 is carried out by referring to the self calibration description of the operational amplifier A1, before the self calibration of the operational amplifier A2, the input signals INP2 and INN2 of the operational amplifier A2 are input to the corresponding input ends of the rotary operational amplifier B, when the operational amplifier A2 is self-calibrated, in a switch switching circuit U2, a switch k22 is controlled to be switched on by a switch control signal TCAL 2/a control switch k12, and an output signal Vo of the rotary operational amplifier B is switched into an output signal of the operational amplifier A2 by the switch control signal TCAL2 (opposite to the signal TCAL 2/potential); before the self calibration of the operational amplifier A3, input signals INP3 and INN3 of the operational amplifier A3 are input to corresponding input ends of the rotary operational amplifier B, when the operational amplifier A3 is self-calibrated, in a switch switching circuit U3, a switch control signal TCAL 3/a control switch k13 is turned off, and a switch control signal TCAL3 (opposite to the signal TCAL 3/potential) controls a switch k23 to be turned on so as to switch an output signal Vo of the rotary operational amplifier B into an output signal of the operational amplifier A3. Normally, a clock signal generates a jump edge at intervals, and each operational amplifier (A1, A2 and A3) is self-calibrated in sequence; in other cases, when the environment where each op amp is located, such as temperature, changes, a clock signal is also set to generate a jump edge, so as to trigger each op amp to perform round robin calibration. The self calibration of the operational amplifier is completed by eliminating the offset voltage of the operational amplifier, and specifically, the input signal or/and the output signal of the operational amplifier are compensated according to the offset voltage so as to offset the influence of the offset voltage on the output signal of the operational amplifier. When the number of the operational amplifiers is large, the rotation calibration can be carried out according to the operational amplifiers in turn, and only one extra rotation operational amplifier B is still needed. The multi-operational amplifier calibration method can be used for multi-operational amplifiers in various occasions, particularly in a multi-channel sampling circuit, a multi-channel control circuit and the like, can ensure that a plurality of sampling signals/control signals obtained through the multi-operational amplifier have no obvious change during the operational amplifier calibration switching, and the switching is smooth and steady, thereby ensuring the accurate monitoring of the signals and the normal operation of the system.
As shown in FIG. 2, the waveform diagram of the rotary calibration operation of the multi-operational amplifier is shown, and after the operational amplifiers A1, A2 and A3 are powered on, initial calibration is performed first, so that the influence of the current environment on offset voltage of each operational amplifier is eliminated. Before self calibration of the operational amplifier A1, input signals of the operational amplifier A1 are respectively input to the input end of the rotary operational amplifier B, in addition, the rotary operational amplifier B needs to be self-calibrated to eliminate the influence of the current environment and previous input changes on offset voltage of the rotary operational amplifier, when the clock signal CLK generates a jump edge, the operational amplifier A performs self calibration, at the moment, output signals of the rotary operational amplifier B serve as output signals of the operational amplifier A, and the phase corresponds to a first channel, namely self calibration of the operational amplifier A1 and preparation before self calibration are completed in the first channel. After the self calibration of the operational amplifier A1, the operational amplifier B performs self calibration again and inputs the input signal of the operational amplifier A2 to the input terminal of the operational amplifier B (the sequence between the self calibration of the operational amplifier B and the switching of the input signal is not limited), so as to prepare for the self calibration of the operational amplifier 2, and after the self calibration of the operational amplifier A2 is completed, the self calibration of the operational amplifier A3 is performed again, which is not described in further detail herein. After the self calibration of the operational amplifiers A1-A3 is completed, the completion of one-time round-robin calibration of each operational amplifier is indicated, and the next jump edge of the clock signal CLK is triggered temporarily to trigger the next round-robin calibration of each operational amplifier. The time at which the clock signal CLK generates the transition edges and the time interval between the respective transition edges may be set as required for calibration.
As shown in fig. 3, a schematic diagram of a multi-channel driving system is illustrated, where a multi-op amp and the above-mentioned rotation calibration technique are applied, and three channels are taken as an example in the drawing, and the multi-channel driving system includes a first channel 01, a second channel 02 and a third channel 03, and is used for driving different types of loads, such as resistive loads, inductive loads and capacitive loads. Each channel is provided with a sampling module and a driving tube, taking the first channel 01 as an example, the sampling module comprises a first sampling module 101 and a driving tube NMOS1, the driving tube NMOS1 is connected between an input power source VIN and a corresponding first load 102, when the driving tube NMOS1 is opened, the input power source VIN drives the first load 102 to normally work, the first sampling module 101 comprises a first sampling operational amplifier A1 for sampling current on the first load 102 and a first sampling current output module 1011, and the first sampling current output module 1011 obtains corresponding sampling current according to the output result of the first sampling operational amplifier A1. The channel selector 04 selects the corresponding sampling current VCS output according to the load current to be monitored/controlled. The multichannel driving system further comprises a rotary operational amplifier B, the sampling operational amplifiers in the channels are sequentially self-calibrated through the rotary operational amplifier B, so that sampling currents obtained by the channels are accurate, no obvious change of the sampling currents can be ensured when the sampling operational amplifiers are self-calibrated, and the sampling currents are kept stable and smooth. The respective sampling op-amp is not limited to use for sampling load current, but may also be used for sampling load voltage, or other electrical signals in a multi-channel system. The multi-operational amplifier is not limited to be used in multi-channel signal sampling, but also can be used in circuit control, and in short, the application range of the multi-operational amplifier is not limited.
Although the embodiments have been described and illustrated separately above, and with respect to a partially common technique, it will be apparent to those skilled in the art that alternate and integration may be made between embodiments, with reference to one embodiment not explicitly described, and reference may be made to another embodiment described.
The above-described embodiments do not limit the scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the above embodiments should be included in the scope of the present invention.
Claims (12)
1. The utility model provides a round robin calibration method of many operational amplifier, many operational amplifier include first operational amplifier to N operational amplifier, N is the integer more than 1, its characterized in that: when a jump edge is generated on a given clock signal, self-calibrating is sequentially carried out on the first operational amplifier to the Nth operational amplifier, and when self-calibrating is carried out on the Kth operational amplifier, the set output signal of the wheel transfer amplifier is used as the output signal of the Kth operational amplifier;
And obtaining an output signal of the rotary operational amplifier according to the input signal of the Kth operational amplifier before self-calibration of the Kth operational amplifier, wherein K is an integer which is more than 1 and less than or equal to N.
2. The multi-op-amp rotation calibration method of claim 1, wherein: before the self calibration of the Kth operational amplifier, the non-inverting input signal and the inverting input signal of the Kth operational amplifier are respectively input to the non-inverting input end and the inverting input end of the rotary operational amplifier.
3. The multi-op-amp rotation calibration method of claim 2, wherein: and carrying out self calibration on the rotary operational amplifier before self calibration on the Kth operational amplifier.
4. The multi-op-amp rotation calibration method of claim 2, wherein: and after the first operational amplifier to the Nth operational amplifier are electrified, carrying out initialization calibration on the first operational amplifier to the Nth operational amplifier.
5. The multi-op-amp rotation calibration method of claim 2, wherein: the step of self-calibrating the kth op-amp includes: and acquiring the offset voltage of the Kth operational amplifier, and compensating the input signal or/and the output signal of the Kth operational amplifier according to the offset voltage.
6. The multi-op-amp rotation calibration method of claim 1, wherein: and when the environmental temperature of the multi-operational amplifier changes, setting the clock signal to generate a jump edge within a certain time range.
7. The multi-op-amp rotation calibration method of claim 1, wherein: the clock signal is set to generate a transition edge at intervals.
8. A multi-op cyclic calibration circuit, the multi-op cyclic calibration circuit comprising a first op to an nth op, N being an integer greater than 1, characterized in that: the device comprises a wheel transfer amplifier and N switch switching circuits, wherein each operational amplifier corresponds to one corresponding switch switching circuit; when a given clock signal generates a jump edge, the first operational amplifier to the N operational amplifier are sequentially self-calibrated, and when the K operational amplifier is self-calibrated, the output signal of the rotary operational amplifier is switched into the output signal of the K operational amplifier through a corresponding switch switching circuit;
before self calibration of the Kth operational amplifier, the non-inverting input signal and the inverting input signal of the Kth operational amplifier are respectively input to the non-inverting input end and the inverting input end of the rotary operational amplifier, and K is an integer which is more than 1 and less than or equal to N.
9. The multi-op-amp rotary calibration circuit of claim 8 wherein the first op-amp to the nth op-amp is initially calibrated after the first op-amp to the nth op-amp is powered up; and carrying out self calibration on the rotary operational amplifier before self calibration on the Kth operational amplifier.
10. The multi-op amp rotary calibration circuit according to claim 8, wherein each of the switch switching circuits comprises a first switch and a second switch, a first end of the first switch being connected to an output of the corresponding op amp, a second end of the first switch being connected to a first end of the second switch, a second end of the second switch being connected to an output of the rotary op amp; when the Kth operational amplifier performs self calibration, the first switch is controlled to be turned off, the second switch is turned on, and a signal output by a common connection end of the first switch tube and the second switch is used as an output signal of the Kth operational amplifier.
11. The multi-op-amp, round robin calibration circuit of claim 8, wherein: when the environmental temperature of the multi-operational amplifier changes, setting the clock signal to generate a jump edge within a certain time range; or sets the clock signal to generate a transition edge at intervals.
12. A multi-channel drive system for driving multiple types of loads, characterized by: a rotary calibration circuit comprising a plurality of operational amplifiers according to any one of claims 8-11, said plurality of operational amplifiers being in one-to-one correspondence with said plurality of types of loads, respectively, said plurality of operational amplifiers being for sampling electrical signals on said plurality of types of loads, respectively.
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