CN110427066B - DDI IR voltage drop compensation circuit for digital operation - Google Patents
DDI IR voltage drop compensation circuit for digital operation Download PDFInfo
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- CN110427066B CN110427066B CN201910879883.0A CN201910879883A CN110427066B CN 110427066 B CN110427066 B CN 110427066B CN 201910879883 A CN201910879883 A CN 201910879883A CN 110427066 B CN110427066 B CN 110427066B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
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Abstract
The invention provides a DDI IR drop compensation circuit for digital operation, which comprises a reference voltage generator (1) and a digital power supply voltage regulator (2), wherein the digital power supply voltage regulator (2) comprises a first switching tube (MOS _ A), a second switching tube (MOS _ B) and a controller (21). The connection position of the ground end of the gain stage resistor is switched through the first switching tube (MOS _ A) and the second switching tube (MOS _ B), so that the aim of compensating the voltage applied to the digital domain is fulfilled. The invention can effectively solve the DDI IR pressure drop problem, and is particularly suitable for DDI for fine processing.
Description
Technical Field
The invention relates to a display driver chip (DDI), in particular to a DDI IR drop compensation circuit for digital operation.
Background
As chip fabrication processes are developed toward micromachining, line widths are reduced and power supply voltages are also reduced. The advantage of this approach is that a faster design can be achieved in a smaller area. However, as the line width decreases, the resistance of the power supply line increases, and due to the resistance of the power supply line and the power consumption of the logic unit, an IR drop problem occurs in which sufficient voltage cannot be supplied to the logic unit. This problem is particularly important on mobile devices.
The number of logic gates in a DDI increases with increased resolution (e.g., FHD, WQHD) and logic functions. Therefore, current consumption due to the operation of the digital domain is increasing.
The increase in current consumption due to the metal resistance component of the power supply line can cause voltage drops to propagate to the digital area, which causes the logic function to fail due to logic cell delay variations.
Disclosure of Invention
It is an object of the present invention to provide a DDI IR drop compensation circuit for digital operation that solves the above-mentioned drawbacks of the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a DDI IR voltage drop compensation circuit for digital operation comprises a reference voltage generator (1) and a digital power supply voltage regulator (2), wherein the ground terminal of the reference voltage generator (1) is connected with a first ground (VSS1), the output terminal of the reference voltage generator (1) is connected with the power supply terminal (A) of a digital domain through a first resistor (R1), the ground terminal (B) of the digital domain is connected with a second ground (VSS2) through a second resistor (R2), the digital power supply voltage regulator (2) comprises a first switching tube (MOS _ A), a second switching tube (MOS _ B) and a controller (21), the first switching tube (MOS _ A) is connected between the first ground (VSS1) and the ground terminals of gain stage resistors (R _ Up and R _ Down) of the reference voltage generator (1), and the second switching tube (MOS _ B) is connected between the ground terminal (B) of the digital domain and the gain stage resistors (R _ Up and R _ Down) of the reference voltage generator (1) Between the ground ends of a _ Down), the controller (21) is respectively connected with the control end of the first switch tube (MOS _ A) and the control end of the second switch tube (MOS _ B) and is used for selecting the conduction of the first switch tube (MOS _ A) or the conduction of the second switch tube (MOS _ B).
When the first switch tube (MOS _ A) is conducted and the second switch tube (MOS _ B) is cut off, the ground ends of the gain stage resistors (R _ Up and R _ Down) of the reference voltage generator (1) are connected with the first ground (VSS1), and the actual voltage applied to the digital domain is VOUT- (R1+ R2) Idc. When the second switch tube (MOS _ B) is conducted and the first switch tube (MOS _ A) is cut off, the ground ends of gain stage resistors (R _ Up and R _ Down) of the reference voltage generator (1) are connected with the ground end (B) of the digital domain, namely an IR voltage drop point, at the moment, the voltage of a feedback point FB _ P is reduced, and the output voltage VOUT of the reference voltage generator (1) is increased, so that the voltages at the two ends of the digital domain are compensated. By implementing the controller (21), it is enabled to select the on/off states of the first switching tube (MOS _ a) and the second switching tube (MOS _ B) according to the amount of IP (or specific IP operation) operating in the digital domain.
Preferably, when the amount of the IP running in the digital domain is small, the first switching tube (MOS _ a) is turned on and the second switching tube (MOS _ B) is turned off; when the quantity of the IP operated in the digital domain is large, the first switch tube (MOS _ A) is cut off and the second switch tube (MOS _ B) is conducted.
Preferably, the reference voltage generator (1) comprises a first operational amplifier (Amp1) as a primary and a second operational amplifier (Amp2) as a secondary.
Preferably, the first switching tube (MOS _ a) and the second switching tube (MOS _ B) are field effect transistors.
Compared with the prior art, the invention has at least the following beneficial effects:
the invention adopts the combination of the controller, the first switch tube and the second switch tube, compensates the voltage applied to the digital domain by switching the connection position of the ground end of the gain stage resistor, and can effectively solve the DDI IR voltage drop problem. Particularly suitable for DDI for fine processing.
Drawings
Fig. 1 is a circuit diagram of an exemplary embodiment.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
The circuit of an exemplary embodiment is shown in FIG. 1, where the dotted line indicates the chip boundary, Load @ Digital is the Digital domain, IdcThe point A represents the power supply end of the digital domain, the point B represents the ground end of the digital domain, and the resistor R _ Up and the resistor R _ Down form a gain stage resistor.
Referring to fig. 1, the DDI IR drop compensation circuit for digital operation includes a reference voltage generator 1 and a digital power voltage regulator 2. The ground terminal of the reference voltage generator 1 is connected with a first ground VSS1, the output terminal of the reference voltage generator 1 is connected with a power supply terminal A of a digital domain through a first resistor R1, and the ground terminal B of the digital domain is connected with a second ground VSS2 through a second resistor R2. The digital power supply voltage regulator 2 comprises a first switching tube MOS _ a, a second switching tube MOS _ B and a controller 21, wherein the first switching tube MOS _ a is bridged between the first ground VSS1 and the ground of the gain stage resistor of the reference voltage generator 1, the second switching tube MOS _ B is bridged between the ground B of the digital domain and the ground of the gain stage resistor of the reference voltage generator 1, and the controller 21 is respectively connected with the control end of the first switching tube MOS _ a and the control end of the second switching tube MOS _ B and is used for selecting the first switching tube MOS _ a to be conducted or the second switching tube MOS _ B to be conducted.
When the first switch MOS _ A is turned on and the second switch MOS _ B is turned off, the ground terminal of the gain stage resistor of the reference voltage generator 1 is connected to the first ground VSS1, and the actual voltage applied to the digital domain is VOUT- (R1+ R2) Idc. When the second switch tube MOS _ B is conducted, the first switchWhen the MOS _ A is cut off, the ground end of the gain stage resistor of the reference voltage generator 1 is connected with the ground end B (namely an IR voltage drop point) of the digital domain, at the moment, the voltage of a feedback point FB _ P is reduced, and the output voltage VOUT of the reference voltage generator 1 is increased, so that the voltages at the two ends of the digital domain are compensated. By implementing the controller 21, it is enabled to select the on/off states of the first switching transistor MOS _ a and the second switching transistor MOS _ B according to the amount of IP (or specific IP operation) operated in the digital domain.
Further, the reference voltage generator 1 includes a first operational amplifier Amp1 as a primary side and a second operational amplifier Amp2 as a secondary side. The first switch tube MOS _ A and the second switch tube MOS _ B adopt field effect tubes.
In summary, in this embodiment, the controller 21, the first switching transistor MOS _ a and the second switching transistor MOS _ B are combined, and the voltage applied to the digital domain is compensated by switching the connection position of the ground terminal of the gain stage resistor, so that the DDI IR drop problem can be effectively solved. The present invention is particularly suited for DDI for fine processing.
The present invention has been described in detail with reference to the specific embodiments, and the detailed description is only for the purpose of helping those skilled in the art understand the present invention, and is not to be construed as limiting the scope of the present invention. Various modifications, equivalent changes, etc. made by those skilled in the art under the spirit of the present invention shall be included in the protection scope of the present invention.
Claims (3)
1. A DDI IR voltage drop compensation circuit for digital operation, comprising a reference voltage generator (1) and a digital supply voltage regulator (2), wherein a ground terminal of the reference voltage generator (1) is connected to a first ground (VSS1), an output terminal of the reference voltage generator (1) is connected to a power supply terminal (a) of a digital domain through a first resistor (R1), a ground terminal (B) of the digital domain is connected to a second ground (VSS2) through a second resistor (R2), the digital supply voltage regulator (2) comprises a first switch (MOS _ a), a second switch (MOS _ B) and a controller (21), the first switch (MOS _ a) is connected across the first ground (VSS1) and a gain stage resistor (R _ Up) of the reference voltage generator (1)R _ Down), the second switch tube (MOS _ B) is bridged between the ground terminal of the digital domain and the ground terminals of the gain stage resistors (R _ Up and R _ Down) of the reference voltage generator (1), the controller (21) is respectively connected with the control terminal of the first switch tube (MOS _ A) and the control terminal of the second switch tube (MOS _ B) and is used for selecting the first switch tube (MOS _ A) to be conducted or the second switch tube (MOS _ B) to be conducted, when the quantity of IP operated in the digital domain is small, the first switch tube (MOS _ A) is conducted and the second switch tube (MOS _ B) is cut off, the ground terminal of the gain stage resistor of the reference voltage generator is connected with the first ground, and the actual voltage applied to the digital domain is VOUT- (R1+ R2) IdcVOUT is the output voltage of the reference voltage generator, IdcRepresenting the current of the digital domain; when the quantity of the IP running in the digital domain is large, the first switch tube (MOS _ A) is cut off, the second switch tube (MOS _ B) is conducted, the ground end of the gain stage resistor of the reference voltage generator is connected with the ground end of the digital domain, at the moment, the voltage of a feedback point FB _ P is reduced, the output voltage VOUT of the reference voltage generator is increased, and therefore the voltages at the two ends of the digital domain are compensated.
2. A DDI IR-drop compensation circuit for digital operation according to claim 1, wherein the reference voltage generator (1) comprises a first operational amplifier (Amp1) as a primary and a second operational amplifier (Amp2) as a secondary.
3. A DDI IR-drop compensation circuit for digital operation according to claim 1, wherein the first switching transistor (MOS _ a) and the second switching transistor (MOS _ B) are field effect transistors.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879883.0A CN110427066B (en) | 2019-09-18 | 2019-09-18 | DDI IR voltage drop compensation circuit for digital operation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910879883.0A CN110427066B (en) | 2019-09-18 | 2019-09-18 | DDI IR voltage drop compensation circuit for digital operation |
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| CN110427066A CN110427066A (en) | 2019-11-08 |
| CN110427066B true CN110427066B (en) | 2020-12-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07212641A (en) * | 1994-01-20 | 1995-08-11 | Fujitsu General Ltd | Cable loss compensation circuit |
| CN201332359Y (en) * | 2008-12-03 | 2009-10-21 | 鸿松精密科技股份有限公司 | Output voltage compensating device |
| TWI412219B (en) * | 2009-08-13 | 2013-10-11 | Niko Semiconductor Co Ltd | Power control circuit with wire compensation and wire compensation method of the same |
| CN105094189B (en) * | 2014-05-14 | 2018-03-30 | 登丰微电子股份有限公司 | Cable loss compensator circuit and the power circuit with cable loss compensator |
| CN206585328U (en) * | 2017-03-23 | 2017-10-24 | 深圳市诚芯微科技有限公司 | A kind of Novel cable voltage-drop compensation circuit |
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Inventor after: Zheng Chengbi Inventor after: Wang Dong Inventor before: Zheng Chengbi Inventor before: Wang Dong |
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Address after: 526070 Room 127, Building B, Zhaoqing Investment Development Co., Ltd., North Eight District, Guicheng New Town, Dinghu District, Zhaoqing City, Guangdong Province Applicant after: Guangdong Shenghe Microelectronics Co., Ltd Address before: 526070 Room 127, Building B, Zhaoqing Investment Development Co., Ltd., North Eight District, Guicheng New Town, Dinghu District, Zhaoqing City, Guangdong Province Applicant before: Guangdong Shenghe Technology Co.,Ltd. |
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Address after: 526000 room 5, 203, building C1, maker business center, Zhanqian Avenue, Zhaoqing New District, Dinghu District, Zhaoqing City, Guangdong Province Patentee after: Shenghe Microelectronics (Zhaoqing) Co.,Ltd. Address before: 526070 Room 127, Building B, Zhaoqing Investment Development Co., Ltd., North Eight District, Guicheng New Town, Dinghu District, Zhaoqing City, Guangdong Province Patentee before: Guangdong Shenghe Microelectronics Co., Ltd |