CN116632002A - Resistor trimming circuit, design method and design device thereof - Google Patents
Resistor trimming circuit, design method and design device thereof Download PDFInfo
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- CN116632002A CN116632002A CN202310904376.4A CN202310904376A CN116632002A CN 116632002 A CN116632002 A CN 116632002A CN 202310904376 A CN202310904376 A CN 202310904376A CN 116632002 A CN116632002 A CN 116632002A
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Abstract
The invention discloses a resistor trimming circuit, a design method and a design device thereof. Wherein the resistance trimming circuit includes: the first end of the first resistor string is connected with the voltage input end; the second end of the second first resistor string is connected with the second resistor strings which are sequentially connected in series; the tail end of the second resistor string connected in series is connected in series with the ground through the second first resistor; the connection node between the adjacent second resistor strings is connected with the voltage output end through a switch unit; the connecting node between the tail end of the second resistor string connected in series and the second first resistor string is connected with the voltage output end through a switch unit; the first third resistor string is connected with the first second resistor string to the nth second resistor string in parallel; the second third resistor string is connected in parallel with the (n+1) th second resistor string to the (2 n) th second resistor string. The scheme provided by the invention reduces the matching number of trimming resistors, saves the layout design area and is beneficial to miniaturization design.
Description
Technical Field
The embodiment of the invention relates to the technical field of integrated circuit design, in particular to a resistor trimming circuit, a design method and a design device thereof.
Background
At present, the resistor trimming circuit is widely applied to various integrated circuits to improve the accuracy of output voltage. When the power supply voltage fluctuates, the power supply voltage is divided in advance through the trimming resistor, and the power supply exceeding the range of the subsequent circuit caused by overlarge amplitude is avoided, so that the more accurate power supply voltage is output through the resistor trimming circuit to cooperate with the reasonable operation of the subsequent circuit.
There are a number of conventional resistor trimming schemes in the prior art. The voltage adjustment is realized based on the resistor voltage division principle by serially connecting trimming resistors, but when the trimming precision requirement is higher, the number of designed resistors can be multiplied, so that the layout area is increased, and the miniaturization design is not facilitated.
Disclosure of Invention
The invention provides a resistor trimming circuit, a design method and a design device thereof, which are used for solving the defects in the prior art, realizing high-precision voltage trimming, simultaneously reducing the matching number of trimming resistors, saving the layout design area and being beneficial to miniaturized design.
In a first aspect, an embodiment of the present invention provides a resistor trimming circuit, including: at least two first resistor strings, 2n second resistor strings, at least two third resistor strings, and 2n switching units; wherein n is a positive integer;
a first end of a first resistor string is connected with a voltage input end; the second end of the second first resistor string is connected with the second resistor strings which are sequentially connected in series; the tail end of the second resistor string connected in series is connected in series with ground through the second first resistor;
the connecting node between the adjacent second resistor strings is connected with the voltage output end through a switch unit; the connecting node between the tail end of the second resistor string connected in series and the second first resistor string is connected with the voltage output end through the switch unit;
the first third resistor string is connected with the first second resistor string to the nth second resistor string in parallel; and the second third resistor string is connected with the (n+1) th second resistor string to the (2 n) th second resistor string in parallel, wherein the ratio of the total resistance value of the n second resistor strings to the total resistance value of the third resistor string is at least greater than 10.
Optionally, the first resistor string includes a trimming resistors, the second resistor string includes b trimming resistors, and the third resistor string includes c trimming resistors; a, b and c are positive integers;
trimming precision of the resistor trimming circuit is as follows:the method comprises the steps of carrying out a first treatment on the surface of the V1 is the input voltage.
Optionally, the trimming range of the resistor trimming circuit is as follows。
Optionally, the trimming resistors have equal resistance values.
Optionally, the switching unit is a field effect switching tube.
In a second aspect, an embodiment of the present invention provides a method for designing a resistor trimming circuit, which is used for designing the resistor trimming circuit according to any embodiment of the present invention, including:
according to the parallel relation between the third resistor string and n second resistor strings, determining the trimming range and trimming precision of the trimming circuit;
determining the number of the second resistor strings according to the trimming range of the trimming circuit, the target trimming range, the trimming precision of the trimming circuit and the target trimming precision;
according to the trimming range and the target trimming range of the trimming circuit, the number of trimming resistors in the first resistor string and the third resistor string is selected;
and selecting the number of trimming resistors in the second resistor strings by combining the number of the second resistor strings and the number of trimming resistors in the third resistor strings, and enabling the ratio of the total resistance value of n second resistor strings to the total resistance value of the third resistor strings to be at least greater than 10.
Optionally, the first resistor string includes a trimming resistors, the second resistor string includes b trimming resistors, and the third resistor string includes c trimming resistors; a, b and c are positive integers;
the number of trimming resistors in the first resistor string and the third resistor string is selected according to the trimming range and the target trimming range of the trimming circuit, and the trimming method comprises the following steps:
determining a first corresponding relation according to the trimming range of the trimming circuit and the target trimming range; wherein, the first correspondence is:the method comprises the steps of carrying out a first treatment on the surface of the K is a target trimming range;
and selecting the number of trimming resistors in the third resistor string to be 1, or 2, or 3, or 4 … … according to the first corresponding relation, and determining the number of trimming resistors in the first resistor string and the third resistor string to be selected when the number of trimming resistors in the first resistor string is an integer.
Optionally, the number of trimming resistors in the second resistor string is selected by combining the number of the second resistor strings and the number of trimming resistors in the third resistor string, and the ratio of the total resistance of n second resistor strings to the total resistance of the third resistor string is at least greater than 10, including:
and selecting the number of trimming resistors in the second resistor strings to be 1, or 2, or 3, or 4 … …, and combining the number of the second resistor strings to enable the ratio of the total resistance value of the n second resistor strings to the total resistance value of the third resistor string to be at least greater than 10.
In a third aspect, an embodiment of the present invention provides a device for designing a resistor trimming circuit, which is configured to design a resistor trimming circuit according to any embodiment of the present invention, including:
the determining module is used for determining the trimming range and trimming precision of the trimming circuit according to the parallel relation between the third resistor string and the n second resistor strings;
the first calculation module is used for determining the number of the second resistor strings according to the trimming range of the trimming circuit, the target trimming range, the trimming precision of the trimming circuit and the target trimming precision;
the second calculation module is used for selecting the number of trimming resistors in the first resistor string and the third resistor string according to the trimming range and the target trimming range of the trimming circuit;
the third calculation module is used for combining the number of the second resistor strings with the number of trimming resistors in the third resistor strings to select the number of trimming resistors in the second resistor strings, and enabling the ratio of the total resistance of n second resistor strings to the total resistance of the third resistor strings to be at least greater than 10.
Optionally, the second computing module includes:
the corresponding unit is used for determining a first corresponding relation according to the trimming range of the trimming circuit and the target trimming range; wherein, the first correspondence is:the method comprises the steps of carrying out a first treatment on the surface of the K is a target trimming range;
and the selection unit is used for selecting the number of trimming resistors in the third resistor string to be 1, or 2, or 3, or 4 … … according to the first corresponding relation, and determining the number of trimming resistors in the selected first resistor string and third resistor string when the number of trimming resistors in the first resistor string is an integer.
According to the technical scheme provided by the embodiment of the invention, the third resistor strings are connected in parallel on the n second resistor strings which are connected in series, so that the voltage trimming at high precision is realized according to the parallel relation between the second resistor strings and the third resistor strings, the matching number of trimming resistors is reduced, the layout design area is saved, and the miniaturization design is facilitated.
Drawings
FIG. 1 is a trimming circuit of resistor voltage division commonly used in the prior art;
FIG. 2 is a schematic diagram of a resistor trimming circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method for designing a resistor trimming circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a design apparatus for a resistor trimming circuit according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a schematic diagram of a trimming circuit for dividing a resistor commonly used in the prior art, in which trimming resistors are sequentially connected in series, and by way of example, for trimming a Vref/2 voltage, two voltage trimming directions may be set according to the trimming circuit. When the trimming accuracy requirement is low, for example, trimming the range from Vref/2-40% Vref to Vref/2+40% Vref is performed on the Vref/2 voltage, and each trimming step is 1% Vref, then according to the voltage division principle, 100 resistors R are required to match at this time, that is, the voltage division step controlled by each switch unit SW1 to SW2n is R/100 r=1%. That is, 100 resistors R0 are needed to realize the trimming of Vref/2 voltage from Vref/2-40% Vref to Vref/2+40% Vref, and the voltage is output by the output end Vout.
When the trimming precision requirement is higher, for example, vref/2-4% Vref to Vref/2+4% Vref is performed on Vref/2 voltage, and each trimming step is 0.1% Vref, then 1000 resistors R are required to match according to the voltage dividing principle, that is, each switch control voltage dividing step is R/1000 R=0.1%, that is, 1000 resistors R are required to match, obviously, along with the improvement of trimming precision, the number of required resistors is increased, so that the increased layout design area cannot realize a good matching effect.
In view of this, fig. 2 is a schematic structural diagram of a resistor trimming circuit according to an embodiment of the present invention, referring to fig. 2, including: at least two first resistor strings 110, 2n second resistor strings 120, at least two third resistor strings 130, and 2n switching units SW; wherein n is a positive integer;
a first end of the first resistor string 110 is connected to the voltage input terminal; a second end of the second first resistor string 110 is connected to a second resistor string 120 which is sequentially connected in series; the end of the series connection of the second resistor string 120 is grounded through the second first resistor string 110;
wherein, the connection node between the adjacent second resistor strings 120 is connected with the voltage output terminal through a switch unit SW; the connection node between the end of the second resistor string 120 connected in series and the second first resistor string 110 is connected to the voltage output terminal through a switching unit SW;
the first third resistor string 130 is connected in parallel with the first to nth second resistor strings 120 to 120; the second third resistor string 130 is connected in parallel with the (n+1) th second resistor string 120 to the (2 n) th second resistor string 120, wherein the ratio of the total resistance of the n second resistor strings 120 to the total resistance of the third resistor string 130 is at least greater than 10.
Specifically, the first resistor string 110, the second resistor string 120 and the third resistor string 130 are resistor strings formed by trimming resistors connected in series, wherein a first end of the first resistor string 110 is connected to a voltage input end, a second end of the first resistor string 110 is connected to one end of the 2n second resistor strings 120 connected in series, and the other end of the second resistor string 120 connected in series is grounded through the second first resistor string 110, wherein in order to improve matching of trimming resistors of a layout, the number of the second resistor strings 120 is selected to be an even number. Illustratively, the second resistor string 120 connected to the first resistor string 110 is denoted as a first second resistor string 120, and by analogy, 2n second resistor strings 120 are connected in series, one end of the first switch unit SW1 is connected between the first second resistor string 120 and the second resistor string 120, the other end of the first switch unit SW1 is connected to the voltage output terminal, and similarly, one switch unit SW is connected between the voltage output terminal and the connection node between each adjacent second resistor string 120. The 2 n-th switching unit SW2n is connected between the voltage output terminal and the connection node of the 2 n-th second resistor string 120 and the second first resistor string 110. The n second resistor strings 120 are connected in parallel with the third resistor string 130, and when the total resistance of the n second resistor strings 120 is far greater than the total resistance of the third resistor string 130, the resistance of the n second resistor strings 120 connected in parallel with the third resistor string 130 is approximately equal to the total resistance of the third resistor string 130, so that the voltage trimming range of the trimming circuit can be determined according to the parallel resistance relationship. When the ratio of the total resistance of the n second resistor strings 120 to the total resistance of the third resistor string 130 is greater than or equal to 10, the total resistance of the n second resistor strings 120 may be considered to be substantially greater than the total resistance of the third resistor string 130. When the voltage is trimmed, the corresponding divided voltage is output at the voltage output end by closing the switch unit SW corresponding to the corresponding connection node.
For example, according to the resistor trimming circuit provided by the embodiment of the invention, when the trimming precision requirement is relatively high, for example, trimming of V1/2-4% V1 to V1/2+4% V1 is performed on the V1/2 voltage, and each trimming step is 0.1% V1, wherein V1 is the input voltage. The layout matching problem is considered during design, so that the number of trimming resistors in each resistor string is integer multiple, and 2 first resistor strings 110 and 2 third resistor strings 130 are arranged. Therefore, according to the parallel resistance value relationship, the trimming range is assigned to 8%, 40 second resistor strings 120 can be obtained through calculation, trimming in the positive direction and the negative direction can be achieved, in order to meet the requirement of setting trimming resistors as few as possible, 1 trimming resistor is set in the second resistor string 120, 23 trimming resistors are correspondingly obtained in the first resistor string 110,2 trimming resistors are set in the third resistor string 130, and the requirement of the trimming range can be met, so that trimming with the trimming stepping value of 0.1% can be completed only by 130 trimming resistors in the whole trimming circuit, and fewer trimming resistors are adopted in the high-precision trimming circuit to match, compared with the prior structure, the layout area is saved.
According to the technical scheme provided by the embodiment of the invention, the third resistor strings are connected in parallel on the n second resistor strings which are connected in series, so that the voltage trimming at high precision is realized according to the parallel relation between the second resistor strings and the third resistor strings, the matching number of trimming resistors is reduced, the layout design area is saved, and the miniaturization design is facilitated.
Based on the above embodiment, optionally, the first resistor string 110 includes a trimming resistors R, denoted as aR in fig. 2, the second resistor string 120 includes b trimming resistors R, denoted as bR in fig. 2, and the third resistor string 130 includes c trimming resistors R, denoted as cR in fig. 2; a, a step of,b and c are positive integers; the trimming precision of the resistor trimming circuit is as follows:the method comprises the steps of carrying out a first treatment on the surface of the V1 is the input voltage.
Specifically, a series trimming resistors R are set in the first resistor string 110, b series trimming resistors R are set in the second resistor string 120, c series trimming resistors R are set in the third resistor string 130, when the total resistance of the n second resistor strings 120 is far greater than that of the third resistor string 130, the resistance of the n second resistor strings 120 and the third resistor string 130 after being connected in parallel is nbR ×cr/(nbR +cr)/(cR) is equal to that of the first resistor string 110 and the third resistor string 130, and therefore, according to the voltage division principle, the voltage division of the third resistor string 130 is that. Thus, the trimming range of the trimming circuit can be determined as follows:
；
thereby the trimming precision is as follows:
wherein V1 is the input voltage of the voltage input terminal. For example, the trimming resistors R in the first resistor string 110, the second resistor string 120, and the third resistor string 130 may be identical resistors, for example, the parameters such as the resistance value, the model, etc. are identical, so as to further improve the design matching of the trimming resistor R in the trimming circuit.
Optionally, the switching unit SW may use a device with a switching function, such as a field effect switch tube, an electromagnetic switch, etc., and change the output voltage of the trimming circuit through the on/off function of the switching unit SW, so as to achieve the purpose of completing voltage trimming.
Fig. 3 is a schematic diagram of a design method of a resistor trimming circuit according to an embodiment of the present invention, where the method may be performed by a design device of the trimming circuit, and the device may be implemented in hardware and/or software. The method specifically comprises the following steps:
s110, determining a trimming range and trimming precision of the trimming circuit according to the parallel relation between the third resistor string and the n second resistor strings;
specifically, the first resistor string 110 includes a trimming resistors R, the second resistor string 120 includes b trimming resistors R, and the third resistor string 130 includes c trimming resistors R; a, b and c are positive integers;
the n second resistor strings 120 are connected in parallel with the third resistor string 130, and when the total resistance of the n second resistor strings 120 is far greater than the total resistance of the third resistor string 130, the resistance of the n second resistor strings 120 connected in parallel with the third resistor string 130 is approximately equal to the total resistance of the third resistor string 130, so that the voltage trimming range of the trimming circuit can be determined according to the parallel resistance relationship. When the ratio of the total resistance of the n second resistor strings 120 to the total resistance of the third resistor string 130 is greater than or equal to 10, the total resistance of the n second resistor strings 120 may be considered to be substantially greater than the total resistance of the third resistor string 130.
When the total resistance of the n second resistor strings 120 is far greater than the total resistance of the third resistor string 130, the resistance of the n second resistor strings 120 and the third resistor string 130 after being connected in parallel is nbR ×cr/(nbR +cr) ×cr, which is equivalent to the series connection of the first resistor string 110 and the third resistor string 130, so that the voltage division of the third resistor string 130 is according to the voltage division principle. Thus, the trimming range of the trimming circuit can be determined as follows:
；
thereby the trimming precision is as follows:
。
s120, determining the number of the second resistor strings according to the trimming range of the trimming circuit, the target trimming range, the trimming precision of the trimming circuit and the target trimming precision;
specifically, an equality relationship is established between the trimming range of the trimming circuit and the target trimming range, an equality relationship is established between the trimming precision of the trimming circuit and the target trimming precision, and the number of the second resistor strings 120 is calculated by using the equality relationship. For example, according to the resistor trimming circuit provided by the embodiment of the invention, when the trimming precision requirement is relatively high, for example, trimming of V1/2-4% V1 to V1/2+4% V1 is performed on the V1/2 voltage, and each trimming step is 0.1% V1, the trimming range can be obtainedAccording to trimming precision, the +.>. It can be calculated that n is 40, i.e. the number of second resistor strings 120 is 80.
S130, selecting the number of trimming resistors R in the first resistor string and the third resistor string according to the trimming range and the target trimming range of the trimming circuit;
specifically, according to the designed target trimming range and the design requirement, the number of trimming resistors R in the first resistor string 110 and the third resistor string 130 needs to be ensured to be positive integers, so that the number of trimming resistors R in the first resistor string 110 and the third resistor string 130 can be selected according to the design requirement, for example, the number of trimming resistors R in the first resistor string 110 or the third resistor string 130 can be assumed to be a value, and the number in the other resistor string can be calculated. By taking the design requirement as the minimum number of R trimming resistors as an example, the trimming range can be obtainedAssuming that the number of trimming resistors R in the third resistor string 130 is 1, the number of trimming resistors R in the second resistor string 120 is calculated to be 11.5, which does not satisfy the requirement of a positive integer, and therefore, assuming that the number of trimming resistors R in the third resistor string 130 is 2, the number of trimming resistors R in the second resistor string 120 is calculated to be 23, and therefore, the number of trimming resistors R in the third resistor string 130 can be selected to be 2, and the second resistor stringThe number of trimming resistors R in 120 is 23.
And S140, selecting the number of trimming resistors R in the second resistor strings by combining the number of the second resistor strings and the number of the trimming resistors R in the third resistor strings, and enabling the ratio of the total resistance of the n second resistor strings to the total resistance of the third resistor strings to be at least greater than 10.
Specifically, according to the design requirement, the number of trimming resistors R in the second resistor string 120 needs to be ensured to be a positive integer, so the number of trimming resistors R in the second resistor string 120 can be selected according to the design requirement, and as an example, the design requirement is that the number of trimming resistors R is minimum, since the total resistance of n second resistor strings 120 is required to be far greater than the total resistance of the third resistor string 130, the number of trimming resistors R in the third resistor string 130 adopts the minimum number in the above steps. The number of trimming resistors R in the second resistor string 120 may be 1, and the ratio of the total resistance of 40 second resistor strings 120 to the total resistance of the third resistor string 130 may be 20, so as to meet the requirement of being far greater. Therefore, in the whole trimming circuit, trimming with the trimming stepping value of 0.1% can be completed only by 130 trimming resistors R, and fewer trimming resistors R are adopted for matching in the high-precision trimming circuit, so that the layout area is saved compared with the conventional structure.
Optionally, the number of trimming resistors R in the first resistor string 110 and the third resistor string 130 is selected according to the trimming range and the target trimming range of the trimming circuit, including:
determining a first corresponding relation according to the trimming range of the trimming circuit and the target trimming range; the first corresponding relation is as follows:the method comprises the steps of carrying out a first treatment on the surface of the K is a target trimming range;
and selecting the number of trimming resistors R in the third resistor string 130 to be 1, or 2, or 3, or 4 … … according to the first corresponding relation, and determining the number of trimming resistors R in the selected first resistor string 110 and third resistor string 130 when the number of trimming resistors R in the first resistor string 110 corresponds to an integer.
Specifically, V1/2-4% V1 to V1/2+4% V1 is trimmed for the V1/2 voltage, each trimmingIs 0.1% V1, can be obtained according to the trimming rangeAccording to trimming precision, the +.>. Since the total resistance of the n second resistor strings 120 is required to be far greater than the total resistance of the third resistor string 130, the number of trimming resistors R in the third resistor string 130 is the smallest possible number. Thus repair the scope->Assuming that the number of trimming resistors R in the third resistor string 130 is 1, the number of trimming resistors R in the second resistor string 120 is calculated to be 11.5, which does not satisfy the requirement of a positive integer, and therefore, assuming that the number of trimming resistors R in the third resistor string 130 is 2, the number of trimming resistors R in the second resistor string 120 is calculated to be 23, and therefore, the number of trimming resistors R in the third resistor string 130 can be selected to be 2, and the number of trimming resistors R in the second resistor string 120 is 23. If the number of trimming resistors R in the second resistor string 120 is calculated to not meet the requirement of the positive integer, it is further assumed that the number of trimming resistors R in the third resistor string 130 is 3 until the requirement is met.
Optionally, selecting the number of trimming resistors R in the second resistor string 120 by combining the number of the second resistor strings 120 and the number of trimming resistors R in the third resistor string 130, and making the ratio of the total resistance of the n second resistor strings 120 to the total resistance of the third resistor string 130 be at least greater than 5 includes:
the number of trimming resistors R in the second resistor string 120 is selected to be 1, or 2, or 3, or 4 … …, and the ratio of the total resistance of the n second resistor strings 120 to the total resistance of the third resistor string 130 is at least greater than 10 in combination with the number of the second resistor strings 120.
Specifically, according to the design requirement, the number of trimming resistors R in the second resistor string 120 needs to be ensured to be a positive integer, so the number of trimming resistors R in the second resistor string 120 can be selected according to the design requirement, and by taking the design requirement as an example with the least number of trimming resistors R being used, the number of trimming resistors R in the second resistor string 120 can be made to be 1, whether the ratio of the total resistance value of the n second resistor strings 120 to the total resistance value of the third resistor string 130 is at least greater than 10 is judged, if yes, the number of trimming resistors R in the second resistor string 120 is determined, if not, the number of trimming resistors R in the second resistor string 120 is continuously assumed to be 2, and continuing to judge until the requirement is met.
Fig. 4 is a schematic structural diagram of a design apparatus for a resistor trimming circuit according to an embodiment of the present invention, referring to fig. 4, including:
a determining module 410, configured to determine a trimming range and trimming precision of the trimming circuit according to the parallel relationship between the third resistor string 130 and the n second resistor strings 120;
the first calculation module 420 is configured to determine the number of the second resistor strings 120 according to the trimming range of the trimming circuit, the target trimming range, the trimming precision of the trimming circuit, and the target trimming precision;
the second calculation module 430 is configured to select the number of trimming resistors R in the first resistor string 110 and the third resistor string 130 according to the trimming range and the target trimming range of the trimming circuit;
the third calculation module 440 is configured to select the number of trimming resistors R in the second resistor string 120 by combining the number of the second resistor strings 120 and the number of trimming resistors R in the third resistor string 130, and make a ratio of a total resistance value of the n second resistor strings 120 to a total resistance value of the third resistor string 130 at least greater than 10.
Optionally, the second computing module includes:
the corresponding unit is used for determining a first corresponding relation according to the trimming range of the trimming circuit and the target trimming range; the first corresponding relation is as follows:the method comprises the steps of carrying out a first treatment on the surface of the K is a target trimming range;
the selecting unit is configured to select, according to the first correspondence, 1, 2, 3, or 4 … … of trimming resistors R in the third resistor string 130, and determine the number of trimming resistors R in the selected first resistor string 110 and third resistor string 130 when the number of trimming resistors R in the first resistor string 110 corresponds to an integer.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A resistor trimming circuit, comprising: at least two first resistor strings, 2n second resistor strings, at least two third resistor strings, and 2n switching units; wherein n is a positive integer;
a first end of a first resistor string is connected with a voltage input end; the second end of the second first resistor string is connected with the second resistor strings which are sequentially connected in series; the tail end of the second resistor string connected in series is connected in series with ground through the second first resistor;
the connecting node between the adjacent second resistor strings is connected with the voltage output end through one switch unit; the connecting node between the tail end of the second resistor string connected in series and the second first resistor string is connected with the voltage output end through the switch unit;
the first third resistor string is connected with the first second resistor string to the nth second resistor string in parallel; and the second third resistor string is connected with the (n+1) th second resistor string to the (2 n) th second resistor string in parallel, wherein the ratio of the total resistance value of the n second resistor strings to the total resistance value of the third resistor string is at least greater than 10.
2. The resistor trimming circuit of claim 1, wherein the first resistor string comprises a trimming resistors, the second resistor string comprises b trimming resistors, and the third resistor string comprises c trimming resistors; a, b and c are positive integers;
trimming precision of the resistor trimming circuit is as follows:the method comprises the steps of carrying out a first treatment on the surface of the V1 is the input voltage.
3. The resistor trimming circuit according to claim 2, wherein the trimming range of the resistor trimming circuit is。
4. The resistor trimming circuit according to claim 2, wherein the trimming resistors have equal resistance values.
5. The resistor trimming circuit according to claim 1, wherein the switching unit is a field effect switching transistor.
6. A method for designing a resistance trimming circuit according to any one of claims 1 to 5, comprising:
according to the parallel relation between the third resistor string and n second resistor strings, determining the trimming range and trimming precision of the trimming circuit;
determining the number of the second resistor strings according to the trimming range of the trimming circuit, the target trimming range, the trimming precision of the trimming circuit and the target trimming precision;
according to the trimming range and the target trimming range of the trimming circuit, the number of trimming resistors in the first resistor string and the third resistor string is selected;
and selecting the number of trimming resistors in the second resistor strings by combining the number of the second resistor strings and the number of trimming resistors in the third resistor strings, and enabling the ratio of the total resistance value of n second resistor strings to the total resistance value of the third resistor strings to be at least greater than 10.
7. The method of claim 6, wherein the first resistor string comprises a trimming resistors, the second resistor string comprises b trimming resistors, and the third resistor string comprises c trimming resistors; a, b and c are positive integers;
the number of trimming resistors in the first resistor string and the third resistor string is selected according to the trimming range and the target trimming range of the trimming circuit, and the trimming method comprises the following steps:
determining a first corresponding relation according to the trimming range of the trimming circuit and the target trimming range; wherein, the first correspondence is:the method comprises the steps of carrying out a first treatment on the surface of the K is a target trimming range;
and selecting the number of trimming resistors in the third resistor string to be 1, or 2, or 3, or 4 … … according to the first corresponding relation, and determining the number of trimming resistors in the first resistor string and the third resistor string to be selected when the number of trimming resistors in the first resistor string is an integer.
8. The method of claim 7, wherein selecting the number of trimming resistors in the second resistor string by combining the number of the second resistor strings and the number of trimming resistors in the third resistor string, and making the ratio of the total resistance of the n second resistor strings to the total resistance of the third resistor string be at least greater than 10, comprises:
and selecting the number of trimming resistors in the second resistor strings to be 1, or 2, or 3, or 4 … …, and combining the number of the second resistor strings to enable the ratio of the total resistance value of the n second resistor strings to the total resistance value of the third resistor string to be at least greater than 10.
9. A design apparatus for a resistance trimming circuit for designing a resistance trimming circuit according to any one of claims 1 to 5, comprising:
the determining module is used for determining the trimming range and trimming precision of the trimming circuit according to the parallel relation between the third resistor string and the n second resistor strings;
the first calculation module is used for determining the number of the second resistor strings according to the trimming range of the trimming circuit, the target trimming range, the trimming precision of the trimming circuit and the target trimming precision;
the second calculation module is used for selecting the number of trimming resistors in the first resistor string and the third resistor string according to the trimming range and the target trimming range of the trimming circuit;
the third calculation module is used for combining the number of the second resistor strings with the number of trimming resistors in the third resistor strings to select the number of trimming resistors in the second resistor strings, and enabling the ratio of the total resistance of n second resistor strings to the total resistance of the third resistor strings to be at least greater than 10.
10. The apparatus for designing a resistance trimming circuit according to claim 9, wherein the second calculation module comprises:
the corresponding unit is used for determining a first corresponding relation according to the trimming range of the trimming circuit and the target trimming range; wherein, the first correspondence is:the method comprises the steps of carrying out a first treatment on the surface of the K is a target trimming range;
and the selection unit is used for selecting the number of trimming resistors in the third resistor string to be 1, or 2, or 3, or 4 … … according to the first corresponding relation, and determining the number of trimming resistors in the selected first resistor string and third resistor string when the number of trimming resistors in the first resistor string is an integer.
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