KR20200034190A - Signal transmitting device having r-2r circuit and method of driving the same - Google Patents

Abstract

Disclosed are a signal transmitting device and a method driving the same capable of using 0.5 VDD as well as VDD and GND. The signal transmitting device comprises: a first resistor connected to a first node; a second resistor connected to a second node; and a third resistor connected between the first node and the second node, and when the resistance value of the third resistor is R, the resistance values of the first resistor and the second resistor are 2R respectively, here, a first input is applied to one end of the first resistor, and a second input is applied to one end of the second resistor, wherein the first input is of a first voltage, a second voltage, or a third voltage that is an average of the first voltage and the second voltage, and the second input is the first voltage, the second voltage, or the third voltage.

Description

Signal transmission device having an altoural resistance structure and a driving method therefor {SIGNAL TRANSMITTING DEVICE HAVING R-2R CIRCUIT AND METHOD OF DRIVING THE SAME}

The present invention relates to an R-2R resistance structure signal transmission device and a driving method thereof.

The voltage-based signal transmission device may be very complex in structure according to the voltage distribution law. In addition, only the power supply voltage (VDD) or ground voltage (GND) was used as the input. As a result, many input nodes have to be driven, so the size of the signal transmission device can be increased and power consumption can be increased.

KR 10-1878593 B

The present invention is to provide a signal transmission apparatus and a driving method thereof using 0.5 VDD as input as well as VDD and GND.

In order to achieve the above object, a signal transmission apparatus according to an embodiment of the present invention includes a first resistor connected to a first node; A second resistor connected to the second node; And

It includes a third resistor connected between the first node and the second node, and when the resistance value of the third resistor is R, the resistance values of the first resistor and the second resistor are 2R, respectively. Here, a first input is applied to one end of the first resistor and a second input is applied to one end of the second resistor, and the first input is a first voltage, a second voltage, or the first voltage and the second. It is a third voltage that is the average voltage of the voltage, and the second input is the first voltage, the second voltage, or the third voltage.

The signal transmission device according to another embodiment of the present invention has an R-2R resistance ladder structure, but is applied with 0.5VDD as well as a power supply voltage (VDD) and a ground voltage (GND) as one end of resistors having a resistance value of 2R. It is possible.

A method of driving a signal transmission device having an R-2R resistance ladder structure according to an embodiment of the present invention applies a power supply voltage (VDD) or a ground voltage (GND) to some of the resistances having a resistance value of 2R. To do; And applying 0.5VDD to another resistor.

Since the signal transmission apparatus according to the present invention uses not only VDD and GND, but also 0.5VDD, it is possible to output a large number of output voltages with a small input node. As a result, the size and power consumption of the signal transmission device can be reduced.

In particular, the size of the signal transmission device can be further reduced by connecting differential input nodes.

1 is a circuit diagram of a signal transmission apparatus according to an embodiment of the present invention.
2 is a circuit diagram of a signal transmission apparatus according to another embodiment of the present invention.
3 is a diagram illustrating a circuit of a signal transmission device according to another embodiment of the present invention.
4 is a diagram showing a partial circuit of the signal transmission apparatus of the present invention.
FIG. 5 is a table showing an input / output relationship for using the equalizer technique according to an embodiment of the present invention.
6 is a diagram illustrating an output voltage according to the signal transmission device of FIG. 4.

The singular expression used in this specification includes the plural expression unless the context clearly indicates otherwise. In this specification, terms such as “consisting of” or “comprising” should not be construed as including all of the various components, or various steps described in the specification, among which some components or some steps are It may not be included, or it should be construed to further include additional components or steps. In addition, terms such as “... unit” and “module” described in the specification mean a unit that processes at least one function or operation, which may be implemented in hardware or software, or a combination of hardware and software. .

The present invention relates to a signal transmission device using a digital analog converter (Digital Analog Converter, DAC), the digital analog converter has a R-2R ladder structure but the power supply voltage (VDD) and GND (ground voltage) as a node input In addition, 0.5VDD can be used.

Compared to a signal transmission device using a digital-to-analog converter using only VDD and GND as input, the signal transmission device of the present invention using a digital-to-analog converter using VDD, GND and 0.5VDD as input has the same number of output voltages. When implemented, the number of node inputs may be small. As a result, the size and power consumption of the signal transmission device can be reduced, and various output voltages (amplitude) can be implemented with a small number of words.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a circuit diagram of a signal transmission apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the signal transmission apparatus 100 of the present embodiment may use a digital-to-analog converter having an R-2R resistance ladder structure (R-2R resistance circuit). In FIG. 1, the signal transmission device 100 has a differential circuit structure, but may not have a differential circuit structure.

The R-2R resistance circuit means a circuit in which a resistance having a resistance value of R and a resistance having a resistance value of 2R are repeatedly connected, and the sum of resistances may be 2R.

Looking at the specific structure, the first resistor R1 and the second resistor R2 are connected in parallel based on the first node n1, and the first resistor n1 is connected between the first node n1 and the second node n2. 3 resistor R3 is connected, the fourth resistor R4 is connected to the second node n2, the fifth resistor R5 is connected between the second node n2 and the third node n3, , The sixth resistor (R6) is connected to the third node (n3), the seventh resistor (R7) is connected between the third node (n3) and the transmission line, R1, R2, R3, R4, R5, R6 And R7 may have 2R, 2R, R, 2R, R, 2R and R, respectively.

That is, resistors R1, R2, R4, and R6 having a resistance value of 2R are connected between each node and the input terminal, and resistors R3, R5, R7 having a resistance value of R can be connected between the nodes. have. Here, a node input D _INP may be connected to one end of the resistors R1, R2, R4, and R6 having a resistance value of 2R.

If only the resistance structure is considered without a node input, the sum of the resistances is R because R1 and R2 are connected in parallel with the resistance value of 2R, respectively, and the sum of the resistances is 2R because these R and R3 (R) have a series structure. And 2R and R4 (2R) are connected in parallel, so the sum of resistance is R, and since R and R5 (R) have a series structure, the sum of resistance is 2R, and these 2R and R6 (2R) are parallel structures. Therefore, the sum of the resistances is R, and since these R and R7 (R) have a series structure, the final resistance is 2R. That is, when viewed from each node, a resistor having R and a resistor having 2R are connected in parallel.

According to an embodiment, the signal transmission device 100 may have a differential circuit structure. In this case, the resistors connected to the nodes n4, n5 and n6 may have a differential circuit relationship with the resistors connected to the nodes n1, n2 and n3.

In addition, one end of resistors having a resistance value of 2R may be respectively connected to the node inputs. For example, the first positive input D _INP [0] is connected to one end of the sixth resistor R6 connected to the third node n3, and the second positive input D _INP [1] is It is connected to one end of the fourth resistor R6 connected to the second node n2, and a third positive input D _INP [2] is connected to one end of the second resistor R2 connected to the first node n1. The fourth positive input D _INP [3] may be connected to one end of the first resistor R1 connected to the first node n1. In addition, the first negative input (D _INN [0]) is connected to one end of the 13th resistor R13 connected to the sixth node n6, and the second negative input (D _INN [1]) is the fifth Connected to one end of the eleventh resistor R11 connected to the node n5, the third negative input D _INN [2] is connected to one end of the ninth resistor R9 connected to the fourth node n4, , A fourth negative input D _INN [3] may be connected to one end of the eighth resistor R8 connected to the fourth node n4.

In this case, VDD, GND, or 0.5 VDD may be input to the positive inputs D _INP , respectively, and VDD, GND, or 0.5 VDD, respectively, may also be input to the negative inputs D _INN . Of course, since it is a differential structure, a differential voltage can be applied to corresponding inputs. For example, if D _INP [0] is VDD, D _INP [1] is GND, D _INP [2] is 0.5 VDD, and D _INP [3] is VDD, D _INN [0] is GND and D _INN [1] ] May be VDD, D _INN [2] may be 0.5 VDD, and D _INN [3] may be GND. Meanwhile, the inputs are digital values. Here, the differential voltage of VDD is GND, the differential voltage of GND is VDD, and the differential voltage of 0.5VDD may be 0.5VDD.

In the above, VDD, GND, and 0.5VDD were used as inputs, but the present invention can be extended to the first voltage, the second voltage, and the average voltage of the first voltage and the second voltage used as a node input. However, VDD, GND, and 0.5VDD are likely to be used as inputs due to chip design.

Referring back to FIG. 1, since there are 8 nodes (nodes, n1 to n7, output nodes), output voltages of (2 ^{K / 2} +1) may be generated. Here, K represents the number of nodes and is an integer of 2 or more. That is, 8 nodes are described above, but can be extended to K nodes.

In summary, the digital-to-analog converter used in the signal transmission device 100 of this embodiment uses an R-2R resistor circuit, but 0.5VDD as well as VDD and GND may be used as inputs.

Based on the same number of output voltages, if VDD and GND as well as 0.5VDD are used, the number of nodes (nodes) can be lowered by less than half compared to using VDD and GND without using 0.5VDD, resulting in signal transmission The structure of the device 100 is simplified and the design area can be reduced.

Also, power consumption for driving node inputs for inputting to nodes may be reduced. In addition, since the number of power voltages to be transmitted increases when the number of nodes is increased, it may be applicable to a signal transmission apparatus for transmitting a high-speed signal, and may also be used as a low-power digital-to-analog high-speed converter with a small area.

2 is a circuit diagram of a signal transmission apparatus according to another embodiment of the present invention.

Referring to FIG. 2, unlike the inputs of VDD and GND in the signal transmission apparatus 100a of the present embodiment, 0.5VDD can be applied to a corresponding node without additional circuits using a differential circuit structure.

For example, as shown in FIG. 2, one end of a resistor connected to the second node n2 and one end of a resistor connected to the fifth node n5 are electrically connected, and the resistance of the resistor connected to the first node n1 is One end and one end of the resistor connected to the fourth node n4 are electrically connected, GND is input to the input terminal corresponding to the first node n1, and corresponds to the node n4 corresponding to the first node n1. VDD is input to the input terminal, VDD is input to the input terminal corresponding to the third node n3, and GND can be input to the input terminal corresponding to the node n6 corresponding to the third node n3. That is, the ends of the resistors having a differential structure are electrically connected to each other. As a result, 0.5 VDD may be formed at the node n7 to which resistors are connected due to the characteristics of the differential structure.

That is, even if there is no separate driving device for inputting 0.5VDD, 0.5VDD can be input to one end of the corresponding resistor.

In summary, VDD or GND is input to the ends of some resistors having a resistance value of 2R, and the ends of other resistors can be electrically connected to each other under a differential structure. As a result, there is no need for a separate driving device for generating 0.5 VDD, so the size of the signal transmission device can be further reduced.

3 is a diagram illustrating a circuit of a signal transmission device according to another embodiment of the present invention.

Referring to FIG. 3, the resistors have an R-2R resistor circuit, but two inputs may be selectively provided as resistors having a resistance value of 2R. For example, a specific voltage (VDD, GND) may be input through the first path or 0.5VDD may be selectively input through the second path as one end of the resistor 2R connected to the third node n3. Here, the first path may be a path in which a specific voltage (VDD, GND) is directly applied to one end of the resistor, and the second path may be a path in which 0.5VDD is selectively input through switching.

According to one embodiment, one end of the resistor connected to the third node n3 is connected to the input terminal to which the input D _INP [0] is applied, and one end of the resistor connected to the second node n2 is the input D _INP [1]) is connected to the input terminal to which it is applied, one end of the resistor connected to the first node n1 is connected to the input terminal to which the input D _INP [2] is applied, and another resistor connected to the first node n1 One end of is connected to the input terminal to which the input (D _INP [3]) is applied, and one end of the resistor connected to the sixth node (n6) is connected to the input terminal to which the input (D _INN [0]) is applied, and the fifth node One end of the resistor connected to (n5) is connected to the input terminal to which the input (D _INN [1]) is applied, and one end of the resistor connected to the fourth node (n4) is to the input terminal to which the input (D _INN [2]) is applied. One end of another resistor connected to the fourth node n4 may be connected to an input terminal to which the input D _INN [3] is applied. Also, one end of all resistors can be interconnected to the seventh node n7 through switches.

In this case, when VDD or GND is input to the input terminals, 0.5VDD is naturally applied to the seventh node n7 due to the characteristics of the differential signal.

In such a circuit structure, when VDD or GND is input to one end of a resistor, the corresponding switch is controlled by a control signal SEL to turn off, and when 0.5 VDD is input, a driving device that applies VDD or GND to the input terminal is not operated. It can be turned on by controlling the switch with the control signal SEL. As a result, VDD, GND or 0.5VDD may be input to the selection bottom as one end of the resistor.

4 is a diagram showing a part of a circuit of the signal transmission apparatus of the present invention, Figure 5 is a diagram showing a table showing the input and output relationship for using the equalizer technique according to an embodiment of the present invention, Figure 6 is 4 is a diagram illustrating an output voltage according to the signal transmission device of FIG. 4.

As shown in Fig. 4, the input data IN [3: 0] is converted into a node input D [3: 0] by an encoder, and these node inputs D [3: 0] are used to measure the resistances. Through this, it can be input to the corresponding node (n1, n2 or n3).

In this case, as shown in FIG. 5, when input data IN [3: 0] is converted according to a specific rule, output voltages suitable for the equalizer technique may be generated as shown in FIG. 6. That is, it is possible to obtain uniform output voltages.

The encoding method can be variously modified, and this modification will belong to the scope of the present invention as long as the R-2R resistor circuit of the present invention is used.

On the other hand, the components of the above-described embodiments can be easily grasped from a process point of view. That is, each component can be identified by each process. Also, the process of the above-described embodiment can be easily grasped from the perspective of the components of the device.

In addition, the technical contents described above may be implemented in the form of program instructions that can be executed through various computer means and can be recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, or the like alone or in combination. The program instructions recorded on the medium may be specially designed and configured for the embodiments, or may be known and available to those skilled in computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical media such as CD-ROMs, DVDs, and magnetic media such as floptical disks. -Hardware devices specially configured to store and execute program instructions such as magneto-optical media, and ROM, RAM, flash memory, and the like. Examples of program instructions include high-level language code that can be executed by a computer using an interpreter, etc., as well as machine language codes produced by a compiler. The hardware device can be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

The above-described embodiments of the present invention have been disclosed for purposes of illustration, and those skilled in the art having various knowledge of the present invention will be able to make various modifications, changes, and additions within the spirit and scope of the present invention. It should be regarded as belonging to the following claims.

100: signal transmission device

Claims (9)

A first resistor connected to the first node;
A second resistor connected to the second node; And
A third resistor connected between the first node and the second node,
When the resistance value of the third resistor is R, the resistance values of the first resistor and the second resistor are 2R, respectively,
A first input is applied to one end of the first resistor and a second input is applied to one end of the second resistor,
The first input is a first voltage, a second voltage, or a third voltage that is an average voltage of the first voltage and the second voltage, and the second input is the first voltage, the second voltage, or the third voltage Signal transmission device, characterized in that. The signal transmission apparatus of claim 1, wherein the first voltage is a power supply voltage (VDD), the second voltage is a ground voltage (GND), and the third voltage is 0.5VDD. According to claim 2,
Further comprising a fourth resistor, a fifth resistor and a sixth resistor having a differential structure from the first resistor, the second resistor and the third resistor,
A third input is applied to one end of the fourth resistor, and a fourth input is applied to one end of the fifth resistor,
The third input or the fourth input is VDD, GND or 0.5VDD signal transmission device. The method of claim 3, wherein one end of the first resistor, one end of the second resistor, one end of the fourth resistor, and one end of the fifth resistor are electrically connected to apply 0.5 VDD for applying 0.5 VDD. Signal transmission device characterized in that there is no separate driving device. The method of claim 3, wherein one end of at least one of the first resistor, the second resistor, the fourth resistor, and the fifth resistor is a first path through which VDD or GND is input and a second through which 0.5VDD is input. The path is connected,
One end of the resistance is a signal transmission device, characterized in that electrically connected to each other through a corresponding switch on the second path. R-2R resistance ladder structure,
Signal transmission device, characterized in that the application of 0.5VDD as well as the power supply voltage (VDD) and ground voltage (GND) as one end of the resistor having a resistance value of 2R. 7. The signal transmission device of claim 6, wherein one end of the differential resistors to which 0.5 VDD is input is electrically connected to each other, and there is no separate driving device for generating 0.5 VDD. A method for driving a signal transmission device having an R-2R resistance ladder structure,
Applying a power supply voltage (VDD) or a ground voltage (GND) to some of the resistors having the resistance value of 2R; And
And applying 0.5 VDD with a different resistor. The method of claim 8, wherein the signal transmission device has a differential structure,
A method of driving a signal transmission device, wherein one end of the differential resistors to which 0.5 VDD is input is electrically connected to each other, so that there is no separate driving device for generating 0.5 VDD.

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