TW543290B - An circuit for amplifying the capacity - Google Patents

Abstract

This invention provides a circuit for amplifying the capacity. It decreases charge current and discharge current of the capacitor through the ratio N of current mirror circuit input/current output to make the capacitor with small capacitance equivalent to the capacitor with large capacitance. Moreover, it can adjust the parameter of the ratio N of the current mirror circuit input/current output and choose appropriately the capacitor with small capacitance to achieve the preferred capacitance/capacitor volume ratio and to fit the needs of the volumetric restriction of the integrated circuit.

Description

543290 V. Description of the invention (1) The technical field to which the invention belongs The present invention relates to a capacitor, and more particularly to an equivalent amplifier capacitor circuit device. This equivalent amplifier capacitor circuit device consists only of a small volume and a small capacitance value. Capacitors provide the function of a capacitor with a large capacitance value. In the prior art, according to the conventional capacitors, the size of the capacitor will affect the size of the capacitor. The larger the capacitor value, the larger the capacitor volume. In many applications, the application of integrated circuits is especially important. Circuits are important to consider. Therefore, the capacitors of integrated circuits are generally limited to hundreds of Pico-Farads in order to meet the volume requirements of integrated circuits, and then improve the method. If a capacitor with a larger capacitance value is required, it is limited to the volume. Considering that the technical problems on the capacitor volume are solved by reserving output pins and externally, it is often limited by the lack of pins or the ease of use of integrated circuits. This improvement method faces difficulties, such a phenomenon. It can be further improved to reduce the problem of large capacitors with large capacitance values. For the consideration of cost and technical improvement, it is really necessary for the relevant industry to improve the quantity. SUMMARY OF THE INVENTION The inventor of this case has been engaged in the design and improvement of circuit design related fields and products for many years. In view of the ideal characteristics of reducing the volume of large capacitors and increasing the difficulty and cost of implementation, it is necessary to actively develop its circuit structure.

543290 V. Description of the invention (2) Yes, it is the active research and improvement that led to the development of this invention. That is, the main object of the present invention is to provide an equivalent amplifying capacitor circuit device. The equivalent amplifying capacitor circuit device is to reduce the charging and discharging current of a capacitor through the characteristic of the current mirror circuit input / output current ratio N. A capacitor that achieves a small capacitance value is equivalent to a capacitor function with large capacitance characteristics. A secondary object of the present invention is to provide an equivalent amplifier capacitor circuit device, which can adjust the parameter of the current mirror circuit input / output current ratio to N and appropriately select a capacitor with a small capacitance value to achieve Those who get better characteristics of capacitance value / capacitor volume ratio. Embodiments An equivalent amplification capacitor circuit device of the present invention is mainly characterized by the characteristic C of the capacitor capacitance value. When this capacitance value is large, the charging time is relatively long. Based on this characteristic, a capacitor with a relatively small capacitance value will be charged. The current decreases its charging current according to a certain ratio to slow down the charging speed of the capacitor with a small capacitance value. When a capacitor with a small capacitance value is in the discharging state, it can also reduce its discharge current by a certain ratio to slow down the current for a small capacitance value. The discharge speed of the capacitor can reach a capacitor with a small capacitance value equivalent to a capacitor with a certain proportion of capacitance value amplification, and achieve the function of achieving a large capacitance value with a small volume. Please refer to the first figure. The equivalent amplification capacitor circuit device of the present invention has an output terminal and an input terminal 101 and 102, and is connected to an input control circuit 11, a first current mirror circuit 12, and a second current mirror circuit 13. And an output

543290 V. Description of the invention (3) Capacitor device 14 enables the output terminal ^ (^ for the wheel output of Teijin terminal 102 for the input of the charging current value of the person, so that the input terminal can be used only by her; The input control circuit 1 1 is connected with an output 钿 a current mirror circuit 12 input terminal is connected to the second current mirror circuit 13 input terminal at an output terminal and the other input control circuit 1 1 2 input terminal 1 is the input terminal 102, the input control circuit, and the input terminal 112 is connected to the m terminal. The input terminal of the han control f "circuit 11" and the output 5 input control circuit 1 1 'are run by XVI ^ ΡΜ 〇δθθθ M ^ # 22 ^-NMO ° S ^ n # 2 ^ 1 = In the present invention, the input terminal i 12 is respectively connected to the negative feedback input input 212 of the operational amplifier 21, the PMOS crystal element 仵 22 and the NMOS The source of the crystal element 23 is connected. The positive feedback input terminal 213 of the operational amplifier 21 is connected to the input terminal 111, so that the positive feedback input terminal 213 is connected to the output terminal 101. One output terminal 21 of the amplifier 21 is connected to the gate terminal of the pM0s crystal element 22 and the terminal 2 of a level adjustment voltage device 24, respectively. 4b, and is connected to the gate terminal of the NMOS crystal element 23 through the terminal 24a of the level adjustment voltage device 24. The drain terminal of the pMOS crystal element 22 is the input control circuit 1 1 and the output terminal is the terminal 1 1 3, the output terminal 1 1 3 is connected to the input terminal of the first current mirror circuit 12, the 08 crystal element 23 drain terminal is the input control circuit 11 the other output terminal is the terminal 114, the output terminal The terminal 11 4 is connected to the input terminal of the second current mirror circuit 丨 3. The first current mirror circuit 12 and the output terminal 121 of the second current mirror circuit 13 output terminal 131 and the input control circuit n input terminal 1丨 丨 are connected and form a terminal 1 4 1 connected to the output capacitor device 1 4, and the connection point 1 4 1 is connected

Description of the invention (4) Set the output terminal 101 of the wheel; the operational amplifier 21 is more than the output terminal 101 of 213 °, two j and the positive feedback input terminal 5 input terminal 102 voltage and the output capacitor device 14 ΐ ii 14 2 / point output capacitor \ ί 11 ί! The effective amplifier capacitor circuit device is in the state of charging or discharging the H! * 4 to achieve the function of the automatic PMOS sun opener 22 $ the NM0S crystal element 23 . % Motion WM〇Saa system inputs external voltage through this input terminal 102. In addition, the ratio ^ i ^ by electricity ^ is fed back to the wheel control circuit 1 1 through the input terminal 1 1. The m-amp capacitor capacitor device is in a capacitor charger to properly drive the functions of the first current mirror circuit 12 and the second electric circuit; when the first current mirror circuit 12 is driven, 10 9 ^ 1 is appropriate. Reduce proportionally the charging current value of the input terminal of the equivalent amplifier capacitor circuit device 10; achieve the function of slowing the charging current for the charging time of the output capacitor "/; when the second current mirror circuit 13 is driven A certain proportion of the equivalent amplification capacitor circuit device is reduced. The output current of the output terminal 1 is to reduce the discharge time of the output capacitor for the output capacitor ^, 14. The output capacitor device 14 is composed of a small capacitor value. The capacitor 1 42 is used to achieve the function of reducing the circuit volume. In the equivalent amplification capacitor circuit device of the present invention, when the voltage at the wheel-in terminal 102 is higher than the voltage at the terminal 141 of the capacitor 142 of the output capacitor device 14, the output capacitor Line 14 is set in a charging state, then a low output voltage 21 of the operational amplifier to drive the PMOS transistor element 22 is turned off and the NMOS transistor element 23, because of the

Page 10 543290 V. Description of the invention (5) 'The PM0S crystal element 22 is turned on, and the current at the input terminal 102 passes through the first current mirror circuit 12. The first current mirror circuit 12 \ output current ratio is N / 1 is composed of a current mirror circuit, and the input terminal 102 is charged to the output capacitor device 14 at a current value that is reduced by N times the current value of the output capacitor device 14 to reduce the charging current. . On the contrary, when the voltage at the input terminal 102 is lower than the voltage at the terminal 141 of the output capacitor device 14 and the capacitor 142 is set, the output capacitor device 14 is in the & discharge state, and the operational amplifier 21 passes the high output voltage through the standard. The bit adjustment voltage is set to 24 and the voltage is pulled up to drive the NMOS crystal element 23 and cut off the! > ^ Crystal element 2 2 'Because the N M 0 S crystal element 2 3 is turned on, the current at the input terminal 10 is input to the second current mirror circuit 13 through the terminal 1 1 4, and the second current mirror The circuit 1 3 is composed of a current mirror circuit with an input / output current ratio of N / 1. The output terminal 1 1 current can be reduced by N times the current value. The output capacitor 1 1 4 is used to release the pen. The function of slowing the discharge current for the discharge time of the wheel-out capacitor device 1 4. " The above is a description of the action mode of decomposition action, in order to make those skilled in this art more familiar with the month > the month is to understand the 'the entire circuit of the present invention as a negative feedback system is described as follows: The level adjustment voltage The device 24 provides a potential difference Vab across the nodes 24a and 24b, and Vab must be greater than the absolute value of the starting voltage of the PMOS crystal element 22 plus the absolute value of the starting voltage of the NMOS crystal element 23, that is, Vab > | Vthp | + I Vthn |. In this way, the PMOS crystal element 22 and the NMOS crystal element 23 can be

543290 V. Description of the invention (6) Simultaneous conduction under normal operation, so that the entire circuit is established as a negative feedback system dominated by the operational amplifier 21. Since the negative feedback system has been established, the potentials of the two input terminals 212, 213 of the operational amplifier 21 will be automatically adjusted to the same potential value, that is, the potential of the negative feedback input terminal 212 will follow the potential of the positive feedback input terminal 213; The negative feedback input terminal 2 1 2 is the input point 1 0 2, so it can be said that the potential of the input point 1 2 of this circuit is equal to the potential of the capacitor 1 4 2 terminal 1 4 1, but from the input point 1 0 2 The current charged or discharged is attenuated by the current mirror circuit at a ratio of 1 / N to charge or discharge the capacitor 142, so looking at the terminal 141 is like seeing a capacitor that is N times larger than the capacitor 142. . The capacitance value / capacitor volume ratio (capacitance value refers to the equivalent capacitance value of the equivalent amplification capacitor circuit device of the present invention; capacitor refers to the volume of capacitor 142), which is a capacitor 1 with a small capacitance value of the output capacitance device 14. 42 'The input / output current ratio N of the first current mirror circuit 12 and the second current mirror circuit 13 is determined. The user can obtain the required capacitance value / capacitor volume ratio by proper trimming to meet the product Demanders of bulk circuit volume constraints. In summary, the equivalent amplifying capacitor circuit device of the present invention, the equivalent amplifying capacitor circuit device is to reduce the charging and discharging current of the capacitor through the characteristic of the current mirror circuit input / output current ratio N to achieve a small capacitance value. The capacitor is equivalent to a capacitor with large capacitance characteristics, and the parameter of the current mirror circuit input / output current ratio is N, and a capacitor with a small capacitance value can be selected appropriately to achieve a better capacitance value / capacitor volume ratio and a consistent product. The requirement of the volume limit of the body circuit, this feature produces a practical power tool

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Page 543290 The diagram is briefly explained in order to make it easier for your reviewers to understand the purpose, features, and functions of the present invention. Here is a preferred implementation example, and the accompanying diagram is as follows: The first diagram is the first diagram of the present invention. A schematic circuit diagram of a preferred embodiment. The figure numbers indicate the equivalent amplification capacitor circuit device ... 10 Outputs ... 101 Inputs ... ............... 1 02 Input control circuit ......... 11 End point ......... ......... 111 Endpoint ......... 112 Endpoint ... ............................................................................... .... 114 The first current mirror circuit ............ 12 Output terminal ............ 121 Second current mirror circuit ... 13 Output end ......... 131 Output capacitor device. ........ 14 End point ............... 141 Capacitor ... ..... 142 Operational Amplifier ..... 21 Output ... ........ 211

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Claims (1)

543290 6. Scope of patent application ~ j 1. An equivalent amplifier capacitor circuit device, which is mainly an input control circuit, one output terminal is connected to a first current mirror circuit, and the other output terminal is connected to a second current mirror circuit. An output capacitor device is connected to a current mirror circuit and an output terminal of the second current mirror circuit. The connection point is the output terminal of the equivalent amplifier capacitor circuit device, and one input terminal of the input control circuit is the input terminal of the equivalent amplifier capacitor circuit device. The other input terminal is connected to the output terminal of the equivalent amplifying capacitor circuit device; its main characteristics are: the input control circuit is to determine whether the output capacitor device is in the capacitance after comparing the external voltage input through the input terminal with the output terminal voltage. Charge or discharge state to appropriately drive the first current mirror circuit and the second current mirror circuit to perform the functions of input charging current value and output terminal discharge current value; the first current mirror circuit is reduced by a certain appropriate ratio The charging current value is input to the input end of the equivalent amplification capacitor circuit device, which reduces the charging current. The function of the charging time of the output capacitor device; The second current mirror circuit is a function of reducing the discharge current value of the output terminal of the equivalent amplification capacitor circuit device by a certain proportion to achieve the function of slowing down the discharge time of the output capacitor device. . 2. For the device of the scope of patent application, the input control circuit is connected to the source stage of a PM0S crystal element and an NM0S crystal element by the negative feedback input terminal of an operational amplifier, and the positive return of the operational amplifier The input terminal is connected to the output terminals of the first and second current mirror circuits, and the output terminal of the operational amplifier is respectively connected to the gate terminal of the PM0S crystal element, and is connected to the gate terminal of the NMOS crystal element through a level adjustment voltage device; The PM0S crystal Page 16 543290 VI. Scope of patent application The drains of the body element and the NM0S crystal element are connected to the input terminals of the first and second current mirror circuits, respectively. 3. For the device in the scope of patent application, the operational amplifier compares the external input voltage input from the negative feedback input terminal with the output terminal voltage of the positive feedback input terminal to determine whether it is charging or discharging the output capacitor device. State, to achieve the function of driving the PMOS crystal element and the NMOS crystal element. 4. For the device in the third scope of the patent application, the PM0S crystal element is the one that drives the function of the first current mirror circuit when the output capacitor device is in the charging state; the NMOS crystal element is the output When the capacitor device is in the discharging state, it achieves the function of driving the second current mirror circuit. 5. For the device in the second scope of the patent application, the level adjustment voltage device provides a sufficient potential difference to allow a pair of source-connected NM0S and PM0S crystal elements to be turned on at the same time to establish the entire circuit as a negative loop. Granted by the system. 6. The device according to item 1 of the patent application scope, wherein the first current mirror circuit is composed of a current mirror circuit with an input / output current ratio of N / 1, so as to reduce N times the charging current of the output capacitor device. Functional person. 7. The device according to item 1 of the patent application scope, wherein the second current mirror circuit is composed of a current mirror circuit with an input / output current ratio of N / 1 to reduce the discharge current of the output capacitor device by N times. Functional person. 8. The device according to item 1 of the scope of patent application, wherein the output capacitor device is composed of a capacitor with a small capacitance value to achieve the function of reducing the circuit volume. Page 17 543290 6. Application scope of patent 9. If the device of the scope of patent application is item 1 or 6 or item 7 or item 8, where the capacitance value / capacity volume ratio is determined by the small capacitance of the output capacitor device The value of the capacitor, the input / output current ratio N of the first current mirror circuit and the second current mirror circuit are determined, and the user can obtain the function of the required capacitance value / capacitor volume ratio through appropriate trimming. 10. The device of item 1 or item 5 in the scope of patent application, wherein the level adjustment voltage device makes the entire circuit a negative feedback system, so that the potential of the input terminal of the equivalent amplification capacitor circuit is automatically equal to a small amount within it. Capacitor terminal potential. Page 18