TWI275171B - Current mode trimming apparatus - Google Patents

Abstract

A current mode trimming apparatus for trimming a desire current is provided. The trimming apparatus includes a first transistor, a first resistor, an operational amplifier, a first controlled current source and a second controlled current source. The first and second controlled current sources adjust the output current thereof respectively in accordance with the trimming data. The desire current through the first transistor is trimmed with the manner of increasing/decreasing current. Therefore, the invention cans linear increase/decrease the desire current by controlling the controlled current sources with the trimming data to achieve the goal of trimming.

Description

1275171 IX. Description of the Invention: [Technical Field] The present invention relates to a trimins device, and more particularly to a current mode trimming device. [Prior Art] When the integrated circuit (1C) is manufactured, the electrical characteristics drift due to the multi-process. The drift of this electrical characteristic often creates a lot of uncertainty in designing the circuit. Therefore, in order to reduce the electrical drift factor, in addition to continuing to make progress in the process of manufacturing integrated circuits, there is another way to reinforce the drift, by adjusting the electrical characteristics of the drift by trimming steps. The technique of conventional trimming is nothing more than polycrystalline germanium fuse (p 〇丨y fu s e) or laser cut (Laser Cut). In the technology of Poly fuse,

1 electric 堙VKiil·, and its negative N-type transistor 120;: and pole 1275171 18657twf.doc/e

With the gate. The source of the transistor 120 is electrically coupled to the system voltage VCCA. The resistors 130, 141, 142, and 143 are connected in series between the drain of the N-type transistor 120 and the ground voltage GND. The resistors 141, 142, and 143 have resistance values of 4R Ω, 2R Q , and R Ω , respectively. The pads 151 to 153 and the fuses 161 to I63 are also connected in series between the drain of the N-type transistor 120 and the ground voltage GND t. The pads 152 and 153 are electrically connected to both ends of the resistor 142, respectively. Via the pads 151 to 153, it is possible to selectively burn any one of the fuses 161 to 163, thereby changing the connection state of the fuses 161 to 163. The total resistance value Rt 〇 t of the resistor strings 130, 141, 142, and 143 is determined by determining the connection state of the fuses 161 to 163. Since the target current u = VREF/Rtot, the target current It〇t of the transistor 120 can be rectified by trimming the resistor strings 13〇, (4), 142, and the total resistance value Rt〇t. Fig. 1B is a diagram showing the relationship between the total resistance value of the conventional trimming circuit of Fig. 1A and the target current 1. Please refer to FIG. 1A and FIG. 1B simultaneously, wherein the horizontal axis of FIG. 1B indicates the total resistance value of the resistor strings 13〇, 141, 142, and 143.

Rt〇t, while the vertical axis represents the target current (8) flowing through the transistor 12〇. It can be clearly seen from Fig. 1B that the trimming result of the conventional trimming circuit of Fig. 1A is not linear and therefore will affect the accuracy of the trimming. Furthermore, since the fuses 161 to 163 are not blown before trimming (in this case, the total resistance value of the resistor string Rt 〇 t is the smallest), the conventional trimming circuit must be trimmed from the maximum value of the target current Itm. Therefore, when the target current Itw is smaller than expected: the current value is too small, this conventional trimming circuit cannot be applied because the target current _ cannot be increased. 〇t 1275171 18657twf.doc/e SUMMARY OF THE INVENTION It is an object of the present invention to provide a current mode trimming device for linear trimming results and to adjust or downgrade trimming results as needed . Based on the above and other objects, the present invention provides a current mode trimming device for trimming a target current. The trim device includes a first transistor, a first resistor, an operational amplifier, a first controlled current source, and a second controlled current source. The first resistor is coupled in series with the first transistor between the first voltage and the second voltage. The current flowing through the first transistor is the target current. The first input end of the differential amplifier receives the reference voltage, the second input end is electrically connected to the common node between the first resistor and the first transistor, and the output end of the operational amplifier is electrically connected to the first transistor The gate. The first receiving current source is electrically connected between the common node and the first voltage to provide a first current, and the first current is adjusted according to the received first trimming data. The second controlled current source is electrically connected between the common node and the second voltage to provide a second current, and adjusts the second current according to the received second trimming data. According to a preferred embodiment of the present invention, in the current mode trimming device, the control current source includes n constant current sources CS1 i and n switches swii, wherein csii represents the ith constant current source, swii represents The i-th switch, i is an integer greater than or equal to 〇 and less than n, and n is an integer greater than 〇. The constant current source CSli provides a current of 2 amps, where I is a real number. The switch SWli is connected in series with the 疋 current source csii between the first voltage and the common node. The switch SWli determines its opening and closing state according to the first trimming data. 1275171 18657twf.doc/e In accordance with a preferred embodiment of the present invention, a second mode controlled current source includes n constant current sources CS2i and n switches SW2i, wherein cS2i represents an ith predetermined Current source, SW2i represents the ith switch. The constant current source CS2i provides 23⁄4 amps of current. The switch and the constant current source CS2i are connected in series between the second voltage and the common node to determine the opening and closing state of each of the switches according to the second trimming data. In addition, the present invention changes the target current value by increasing or decreasing the current, that is, using the trimming data to control the controlled current source, so that the target current can be linearly increased or decreased according to the control of the repair data, thereby achieving The purpose of the trimming. The above and other objects, features, and advantages of the present invention will become more apparent from the aspects of the appended claims. [Embodiment] FIG. 2 is a diagram showing a trimming operation of a current mode in accordance with an embodiment of the present invention. Referring to FIG. 2, the trimming apparatus 200 includes an operational amplifier 210, a first transistor 220, a first resistor 230, a first controlled current source 240, and a second controlled current source 250. The transistor 220 and the resistor 230 are connected in series between the first voltage and the second voltage. In the present embodiment, the transistor 220 is, for example, an N-type transistor. The voltage of the transistor 220 is, for example, the system voltage VCCA, and the second voltage may be the ground voltage GND. The first input terminal (here, the positive input terminal) of the operational amplifier 210 receives the reference voltage VREF, and the second input terminal (here, the negative input terminal) of the operational amplifier 210 is electrically connected to the resistor 23〇 and the electric 1251711 18657twf.doc /e A common node CN between crystals 220. The output of the operational amplifier 21 is electrically connected to the gate of the transistor 220. Assuming that the resistance of the resistor 23 is R230, and the current flowing through the resistor 230 is Iosc, then U is two VREF / R230.

The controlled current source 240 is electrically connected between the common node cn and the system voltage VCCA, and the controlled current source 250 is electrically connected between the common node CNv and the ground voltage GND. The controlled current sources 24〇 and 25〇 provide the first current 1240 and the second current 1250 according to the ::: trim data S1 and the second trim data S2, respectively. Since the target current 1 flowing through the transistor 220 is such as two 1·~ + 1250 _ 1240, the controlled current sources 240 and 250 can be controlled by the trimming data S1 and S2, thereby determining the magnitudes of the currents l25〇 and ΐ24〇, thus The purpose of trimming the target current 1_ is achieved. For example, 'the controlled current sources 24〇 and 250 can be controlled by the trimming data S1 and 82, and the currents 125〇 and l24〇 are both amps (or 125. = ", , the target current ItQt = IQse as the finishing device 2 (8) The initial value. When the slave adjusts the target current 1 to a small value, the current i24〇 is increased by the trimming data control device. Otherwise, when the target current It〇t is to be trimmed For larger values, the controlled current source 250 can be controlled to increase the current 125 by the trimming data 82. The controlled current sources 240 and 250 can be implemented with reference to Figure 3. Figure 3 illustrates a trimming device in accordance with the present invention. The example circuit diagram of FIG. 3, the different operation amplifier 210, the first transistor 220, the first resistor 230, the first controlled current source 240, and the second controlled current source 250 can be the same as in FIG. 2, and therefore will not be described again. In this embodiment, the controlled current source 24A includes n fixed-coating sources CS1〇~CSln_i and n switches swi〇~SWln", while the controlled 9 1275171 18657twf.doc/e current source 250 includes n constant currents. Source cS2〇~n switches SW2〇~SW2n_;i 〇 constant current The source CSli each provides a current of 21 amps, where i is an integer greater than or equal to 0 and less than η, n is an integer greater than 〇, and I is a real number. The switch SWli and the constant current source are connected in series with the system voltage VCCA. Between the nodes CN, the switch sW2i and the constant current source CS2i are connected in series between the ground voltage GND and the common node CN. The switch SWli and the switch φ SW2i are respectively determined according to the first trimming data S1 and the second trimming data S2. Fig. 4A is a circuit diagram showing another example of a trimming apparatus according to the present invention. The operational amplifier 210, the first transistor 220, the first resistor 230, the constant current source cS1 〇 CS CSln, and CS2 图 in Fig. 4A The second trimming data S1 and the second trimming data S2 each have the η+ι bit in the present embodiment, and the second trimming data S1 and the second trimming data S2 are respectively omitted. That is, the first trimming data S1 has trimming data bits S|n], /S[n-1], . . . , /S[l], /S[0], and the second trimming data S2 has trimming data bits. S[n], S[n_l], ..., S[l], S[0], where /S[n-1]~/S[0] is the inverse of S[n_l]~S[0] Figure 4B is a diagram showing an exemplary circuit diagram of a fuse unit 410-0, 41 (M, ..., 41〇-n in accordance with the present invention. Referring also to Figures 4A and 4B, in the present embodiment, trimming The data bits S[n], /S[n-1]~/S[0] and s[nl]~S[0] are from the fuse units 410-0, 410-1, ..., 410- n provided. The fuse units 41(H) to 410-n output the first trimming data S1 and the second trimming data S2 依据 according to the state of the internal fuse, and only the fuse single 1275171 18657twf.doc/e yuan 410-0 is For example, the remaining fuse units can be implemented with reference to the fuse unit 410-0. The fuse unit 410-0 includes a pad 411, a second resistor 414, a third resistor 413, a fuse 412, a first reverse gate 415, and a second reverse gate 416. The first end of the resistor 414 is electrically coupled to the system voltage vcca. The first end of the resistor 413 is electrically connected to the second end of the resistor 141, and the second end of the resistor 413 is electrically connected to the pad 411. The first end of the wire 412 is electrically connected to the resistor 413, and the other end of the wire 412 is electrically connected to the ground voltage GND. The input of the reverse gate 415 is electrically connected to the second end of the 414 resistor, and the output of the reverse gate 415 outputs the trim data bit /s[〇]. The input terminal of the reverse gate 41 is electrically connected to the output terminal of the reverse gate 415, and the wheel of the reverse gate 416 is outputted to output the trimming data bit S [〇]. When the fuse 412 is not blown, the trim data bit s[〇] is a logical volume, and the trim data bit /s[o] is a logic one. When the fuse 412 is to be blown, a blow current can be supplied via the pad 411, and the state of the fuse is changed by the fuse 412 by a large amount of blow current. Therefore, when the fuse 412 forms an open circuit, the trimming data bit s[〇] transitions to a logic 1 due to the pull-up resistor 414, and the trim data bit /S[0] is a logical chirp. " Hereinafter, only the switches SW1〇 and SW2◦ are used as an illustrative example, and the remaining switches SW11 to Swin-i can be implemented with reference to the switch SW1〇, and the switches SW2J to SW2lM can be implemented with reference to the switch SW2〇. The switch swi◦ includes a p-type transistor PT〇 and or a gate OR〇. The source and the drain of the transistor ρτ〇 are connected to the constant current source CS1〇 and the common node CN. Or the first round input end and the second input end of the gate r〇 receive the trimming data bits §[11] and 11 1275171^ /s[0], respectively, or the output end of the gate R0 is electrically connected to the transistor The gate of ρτ〇. The switch SW2G includes a bay type transistor NTg and a gate ANDg. The source and the drain of the transistor NT are electrically connected to the constant current source cS2() and the common node CN, respectively. The first input end and the second input end of the AND gate AND0 respectively receive the trimming data bits S[n] and s[0], and the output end of the AND gate AND0 is electrically connected to the gate of the transistor NT〇. The present invention will be more clearly explained for the month b. Hereinafter, the mode of the present invention will be described by taking n = 3 as an example. Figure 5A is a 4 inch illustration of the dressing device of Figure 4A in accordance with the present invention. Figure 5B is a diagram showing one example of the wire making unit of Figure 4B in accordance with the present invention. Please refer to FIG. 5A and FIG. 5 at the same time, wherein when the pad P3~P0 is applied to 3=, 1^ data, the target current ^ can be trimmed to the value of Γ吉姑1L. Table 1 shows a numerical table of Figures 5A and 5B in accordance with an embodiment of the present invention. Figure 6 is 77 依

a ▽, the embodiment of the present invention illustrates the relationship between FIG. 5A and FIG. 5B applied between the pad 3 Ρ〇 3 Ρ〇 and the target current ItQt. The relationship between the same a ^ k whole data and the head 4 shows the current It 〇 t. As can be seen from Figure 6, the repair ~ is linear. 1 education

Truth table ρτ〇nt2 of FIG. 5B NT! NTo Itot off off off, off I〇sc on off off off I〇SC"I off off off off I -21 AOSC ϋ on off off off T -31 i〇SC 〇 Ff_ off off off I -41 lose H ^on off off off I -51 Aosc 12 1275171 18657twf.doc/e

4, according to the mosquito replies through the pad set trimming: and control the first - control electric disk two controlled current source to provide the first current and the second current, into:: two brother standard current itQt purpose . According to the present invention, the target current value is changed, that is, the second value = can be linearly increased or decreased according to the control of the trimming data to achieve the purpose of trimming. Although the present invention has been disclosed above in the preferred embodiments, (4) and the present invention is defined, any person who is familiar with this (four), in the sole and the scope, can be made a little more simple, so this date]: = range when This is subject to the definition of the scope of the patent application. A simple description of the f-style diagram of the brother 1A, showing the block diagram of the conventional trimming circuit. 13 1275171 18657twf.doc/e Figure IB is a diagram illustrating the relationship between the total resistance value 11_ of the conventional trimming circuit of Figure 1A and the target current It()t. 2 is a perspective view of a current mode trimming apparatus in accordance with an embodiment of the present invention. 3 is a circuit diagram showing an example of a finishing device in accordance with the present invention. Figure 4 is a circuit diagram showing another example of a finishing device in accordance with the present invention. - Figure 4 is an exemplary circuit diagram illustrating a fuse unit in accordance with the present invention. * Fig. 5A is a specific example of the Fig. 4 dressing device in accordance with the present invention. Figure 5A is a diagram showing a specific example of the fuse unit of Figure 4 in accordance with the present invention. Fig. 6 is a view showing the relationship between the trimming data applied to the pads Ρ3 to Ρ0 and the target current Itot in Figs. 5A and 5B according to an embodiment of the present invention. [Description of main component symbols] 110, 210: Operational amplifier 120, NT〇~NT" : N-type transistor • 130, 141, 142, 143 · Resistor 151 ～ 153, 4H, P0 to P3: pads 161 to 163 412: fuse 200: trimming device 220: first transistor 230: first resistor 240: first controlled current source 250: second controlled current source 14 1275171 18657twf.doc/e 410-0~410-n : fuse unit 414: second resistor 413: third resistor 415: first reverse gate 416: second reverse gate AND〇~ANDn]: and gate CSl〇~CSln4, CS2〇~CS2n]: constant current source OR〇 ~ORn]: or gate PT〇~PTw: P-type transistor swi〇~swinq, sw2〇~sway: switch

15

Claims (1)

1275171 18657twf.doc/e X. Patent application scope: 1. A current mode trimming device for trimming - target current, the trimming device comprising: a brother-one transistor through which the first transistor flows The current is the target current; a first resistor connected in series with the first transistor between a first voltage and a second voltage; an operational amplifier having a first input receiving a reference voltage The second input end is electrically connected to a common node between the first resistor and the first transistor, and the output end of the operational amplifier is electrically connected to the gate of the first transistor; a current control source electrically connected between the common node and the first voltage for providing a first current, and adjusting the first current according to one of the received first trimming data; and a second controlled The current source is electrically connected between the common node and the second voltage to provide a second current, and the second current is adjusted according to the received one of the second trimming data. 2. The current mode trimming device of claim 1, wherein the first voltage is a system voltage and the second voltage is a ground voltage. 3. The current mode trimming device of claim 1, wherein the first transistor is an N-type transistor, and the drain and the source are electrically connected to the first voltage and the common node, respectively. 16 1275171 18657twf.doc/e 4. The current mode trimming device according to claim 1, further comprising at least one fuse unit, wherein the fuse unit outputs the first trim according to the state of the internal fuse Information and the second trimming information. 5. The current mode trimming device of claim 4, wherein the fuse unit comprises: a second resistor, the first end of which is electrically connected to the first voltage; and a third resistor, the first of which The second end of the fuse is electrically connected to the second end of the third resistor, and the second end of the fuse is electrically connected to the second end a first reverse gate, the input end is electrically connected to the second end of the third resistor, and the output end of the first reverse gate outputs the first trimming data and one of the second trimming data; And a second reverse gate, wherein the input end is electrically connected to the output end of the first reverse gate, and the output end of the second reverse gate outputs the first trimming material and the other trimming material. 6. The current mode trimming device of claim 5, wherein the fuse unit further comprises a pad electrically connected to the first end of the fuse. 7. The current mode trimming device according to claim 1, wherein the first controlled current source comprises: 17 1275171 18657 twf.doc/en a constant current source CSli for respectively providing ampere current, wherein CSli Representing the i-th constant current source, i is an integer greater than or equal to 0 and less than η, η is an integer greater than 0, and I is a real number; and n switches SWli, the switch SWli is connected in series with the constant current source CSli The first voltage and the common node are used to determine the opening and closing state of the first voltage according to the first trimming data, wherein SWli represents the ith switch. 8. The current mode trimming device according to claim 7, wherein the first trimming data has a 0th bit to an nth bit, and the switch SWli comprises: a P-type transistor PTi, the source thereof Electrically connected to the constant current source CSli and the common node, wherein PTi represents an i-th P-type transistor; and a OR gate ORi, the first input end and the second input end respectively receive the first The nth bit and the i th bit of the data are trimmed, and the output of the OR gate is electrically connected to the gate of the P-type transistor PTi, wherein ORi represents the ith or gate. 9. The current mode trimming device according to claim 1, wherein the second controlled current source comprises: n fixed current sources CS2i for respectively supplying 2 amps of current, wherein CS2i represents the ith a constant current source, i is an integer greater than or equal to 〇 and less than η, η is an integer greater than 0, and I is a real number; and 18 1275171 18657 twf.doc/en switches SW2i, the switch SW2i and the constant current source CS2i Connected between the second voltage and the common node, for determining the open/close state according to the second trimming data, wherein SW2i represents the ith switch. 10. The current mode trimming device of claim 9, wherein the second trimming data has a 0th bit to an nth bit, and the switch SW2i comprises: an N-type transistor NTi, the source thereof The first input terminal and the second input terminal respectively receive the first Second, trimming the nth bit and the i th bit, and the output of the AND gate is electrically connected to the gate of the N-type transistor NTi, wherein AND i represents the i-th gate. 19