CN216819824U - Isolation circuit for isolating non-powered threshold and powered threshold signals - Google Patents
Isolation circuit for isolating non-powered threshold and powered threshold signals Download PDFInfo
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- CN216819824U CN216819824U CN202122510105.XU CN202122510105U CN216819824U CN 216819824 U CN216819824 U CN 216819824U CN 202122510105 U CN202122510105 U CN 202122510105U CN 216819824 U CN216819824 U CN 216819824U
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Abstract
The utility model discloses an isolation circuit for isolating a non-power threshold and a power threshold signal, which comprises a selector, wherein the selector is connected between the non-power threshold circuit and the power threshold circuit, one input end of the selector is connected with the output end of the non-power threshold circuit, the output end of the selector is connected with the input end of the power threshold circuit, and an external fixed signal is input into the other input end of the selector. The isolation circuit for isolating the signal without the power threshold and the signal with the power threshold can effectively isolate the signal transmission between the circuit without the power threshold and the circuit with the power threshold in the low power consumption mode, avoids the X state transmission of the circuit without the power threshold to the circuit with the power threshold in the low power consumption mode, and ensures the normal work of the circuit with the power threshold.
Description
Technical Field
The present invention relates to the field of digital circuits, and more particularly to an isolation circuit for isolating non-powered and powered threshold signals.
Background
Electronic products play an extremely important role in our lives, and portable electronic devices are one of the most important. Portable devices require battery power and consume battery power. As is well known, electronic devices consume electric energy and generate heat, and the more the consumed energy is, the more the generated heat is, the more serious the heat is, the higher the thermal noise is, and further, the normal operation of the device is affected, so that the circuit cannot operate normally. Therefore, if the low power consumption design is not performed, the cost may be increased later, and the cost of the whole system may be increased. For example, the heat dissipation amount may increase without low power consumption design, and how to dissipate heat of the chip needs to be considered in packaging, thereby increasing the heat dissipation cost of the package. In addition, products designed with low power consumption can work for a longer time under the same power supply, so that the products with low power consumption are more popular.
The simplest and most effective way to achieve low power consumption is to turn off the power supply of the module that does not need to work, and after the power supply is turned off, the signal transmitted from the module without the power threshold to the module with the power threshold will be converted from an effective value (0 or 1) into an invalid value (X state), and the propagation of the X state may cause the functional disorder of the module with the power threshold, so that the device cannot work normally.
In the prior art, in order to ensure the normal operation of the equipment, the following two methods are generally adopted:
1. in small-scale processes (80nm and below), there is a special Cell (bank), Isolation Cell (Isolation bank) for signal Isolation between unpowered and powered threshold modules, to ensure proper operation of the device; in the cells of large-size process (more than 80 nm), the special Cell is not used for signal isolation at present, and then a process library with an isolated Cell of small process size is selected; however, the process library with the isolated Cell and small process size is selected, so that the production technical requirement is high, and the production cost is high.
2. The gating unit is used for closing the clock of the module and reducing the signal turnover, so that the dynamic power consumption is reduced; however, there is still static power consumption, and the larger the number of gates, the higher the static power consumption.
Therefore, there is a need to provide an isolation circuit for isolating unpowered and powered threshold signals in a large-scale process library application scenario to overcome the above-mentioned drawbacks.
SUMMERY OF THE UTILITY MODEL
The isolation circuit for isolating the signal with the power threshold and the signal without the power threshold can effectively isolate signal transmission between the circuit with the power threshold and the circuit with the power threshold in a low power consumption mode, avoids the circuit without the power threshold from transmitting an X state to the circuit with the power threshold in the low power consumption mode, and ensures the normal work of the circuit with the power threshold.
In order to achieve the above object, the present invention provides an isolation circuit for isolating a no power threshold and a power threshold signal, which is mainly applied to a large-sized process library, wherein the isolation circuit comprises a selector connected between the no power threshold circuit and the power threshold circuit, an input terminal of the selector is connected with an output terminal of the no power threshold circuit, an output terminal of the selector is connected with an input terminal of the power threshold circuit, and an external fixed signal is input to another input terminal of the selector; when the power-off threshold-free circuit is powered off, the power-off threshold-free circuit enters a low power consumption mode and outputs an invalid value, the input port of the selector connected with the power-off threshold-free circuit is not conducted, and the other input end of the selector is conducted to the output end of the selector.
Preferably, the selector is further provided with a control port, and the control port is connected with an external controller to control the conduction state of the two input ports of the selector.
Preferably, the fixed signal input to the other input terminal of the selector is 0 or 1.
Compared with the prior art, the isolation circuit for isolating the signal without the power threshold and the signal with the power threshold can output the signal of the input end with a fixed value of the selector to the circuit with the power threshold in the low power consumption mode, thereby effectively isolating the signal transmission between the circuit without the power threshold and the circuit with the power threshold, avoiding the disorder of the function of the circuit with the power threshold caused by the transmission of the X state to the circuit with the power threshold in the low power consumption mode of the circuit without the power threshold, ensuring the normal work of the circuit with the power threshold and ensuring the running stability of the whole system.
The utility model will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the utility model.
Drawings
FIG. 1 is a circuit block diagram of an isolation circuit of the present invention for isolating unpowered and powered threshold signals.
Detailed Description
Embodiments of the present invention will now be described with reference to the drawings, wherein like element numerals represent like elements. As described above, the present invention provides an isolation circuit for isolating a passive threshold signal and a powered threshold signal, which can effectively isolate signal transmission between the passive threshold circuit and the powered threshold circuit in a low power consumption mode, prevent the passive threshold circuit from transmitting an X state to the powered threshold circuit in the low power consumption mode, and ensure the normal operation of the powered threshold circuit.
Referring to fig. 1, fig. 1 is a circuit diagram of an isolation circuit for isolating signals without a power threshold and with a power threshold according to the present invention. As shown in fig. 1, the isolation circuit for isolating the non-powered threshold and powered threshold signals of the present invention is mainly applied to a large-sized process library, and performs signal isolation between the non-powered threshold circuit and the powered threshold circuit in a low power consumption mode in the large-sized process library; a selector MUX is arranged between the circuit without power supply threshold and the circuit with power supply threshold, an input end I0 of the selector MUX is connected with an output end signal1 of the circuit without power supply threshold, an output end Z of the selector MUX is connected with an input end signal2 of the circuit with power supply threshold, and an external fixed signal is input into the other input end I1 of the selector MUX; when the unpowered threshold circuit is powered down, enters a low power consumption mode and outputs an invalid value, the input end of the selector MUX connected with the unpowered threshold circuit is not conducted, and the other input end I1 of the selector MUX is conducted to the output end Z of the selector MUX.
In addition, as a preferred embodiment of the present invention, the selector MUX is further provided with a control port S, the control port S is connected to an external controller to control the conduction states of two input ports of the selector MUX, that is, when the signal sleep on the control port S is invalid, the selector MUX selects the value of the input terminal I0 thereof to output to the output terminal Z thereof, that is, the output terminal signal1 of the no-power-supply threshold circuit is conducted to the input terminal signal2 of the power-supply threshold circuit through the input terminal I0 of the selector, and when the signal sleep on the control port S is valid, the selector MUX selects the value of the input terminal I1 thereof to output to the output terminal Z thereof, that is, the output terminal signal1 of the no-power-supply threshold circuit cannot be conducted to the input terminal signal2 of the power-supply threshold circuit through the input terminal I0 of the selector; further, the fixed signal input to the other input terminal I1 of the selector MUX is 0 or 1, so that the selector MUX outputs this fixed signal 0 or 1 from the output terminal Z to the powered threshold circuit when entering the low power mode.
Specifically, referring again to FIG. 1, in the present invention, the unpowered threshold circuit is powered by a power supply VDDA, and both the powered threshold circuit and the selector MUX are powered by a power supply VDDB;
in normal operating mode (non-low power mode), the signal sleep input at the control terminal S of the selector MUX is inactive, neither of the power supplies VDDA and VDDB are powered off, and the selector MUX selects as input the output signal1 of the unpowered threshold circuit and passes from the output terminal Z to the input signal2 of the powered threshold circuit.
When the power supply VDDA is powered off, when the whole system enters a low power consumption mode, an input signal sleep of a control end S of the selector MUX is effective, and an output end signal1 of the non-power threshold circuit outputs an X state; when the supply VDDB is normally supplied, the selector MUX selects the value (0 or 1) of the input terminal I1 as an input, so that the X state of the output terminal signal1 of the unpowered threshold circuit is effectively prevented from being transmitted to the input terminal signal2 of the powered threshold circuit, thereby causing the functional disorder of the powered threshold circuit.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.
Claims (3)
1. An isolation circuit for isolating signals without power supply threshold and with power supply threshold, which is mainly applied to large-size process libraries, is characterized by comprising a selector, wherein the selector is connected between the circuit without power supply threshold and the circuit with power supply threshold; when the power-off threshold-free circuit is powered off, the low-power-consumption mode is entered, and an invalid value is output, the input end of the selector connected with the power-off threshold-free circuit is not conducted, and the other input end of the selector is conducted to the output end of the selector.
2. An isolation circuit for isolating a no power threshold and a power threshold signal as claimed in claim 1, wherein the selector is further provided with a control port connected to an external controller for controlling the conduction state of the two inputs of the selector.
3. An isolation circuit for isolating a non-powered threshold signal from a powered threshold signal as claimed in claim 1, wherein the fixed signal input to the other input of the selector is 0 or 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122510105.XU CN216819824U (en) | 2021-10-19 | 2021-10-19 | Isolation circuit for isolating non-powered threshold and powered threshold signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122510105.XU CN216819824U (en) | 2021-10-19 | 2021-10-19 | Isolation circuit for isolating non-powered threshold and powered threshold signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216819824U true CN216819824U (en) | 2022-06-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122510105.XU Active CN216819824U (en) | 2021-10-19 | 2021-10-19 | Isolation circuit for isolating non-powered threshold and powered threshold signals |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216819824U (en) |
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2021
- 2021-10-19 CN CN202122510105.XU patent/CN216819824U/en active Active
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