Control device for sensing power supply voltage of amplifier
Through voltage comparator and charging signal control, the problem of increasing power consumption of the sense amplifier when the delay time of the delay circuit becomes larger is solved, and the power consumption of the sense amplifier is reduced. By intelligently controlling the charging timing of the overdrive voltage, the voltage is ensured. Slowly drop when no longer needed, avoiding high potential operation.
Patent Information
- Application Number
- CN202420751162.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2034-04-12
AI Technical Summary
In the prior art, when the delay time of the sense amplifier becomes larger, the overdrive voltage usage time is extended, resulting in an increase in the power consumption of the sense amplifier and unable to effectively reduce the power consumption.
Design a control device for sensing the power supply voltage of the amplifier, compare the reference voltage with the overdrive voltage through a voltage comparator, control the overdrive voltage driver to stabilize the overdrive voltage at the reference voltage, and control the charging timing of the overdrive voltage through the charging signal. , turn off the overdrive voltage charging signal to reduce power consumption.
It effectively reduces the power consumption of the sensing amplifier. By integrating high control intelligence and high integration power supply signal circuits, it ensures that the overdrive voltage drops slowly when no longer needed, and avoids long-term high potential operation.
Smart Images
Figure CN222145804U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of memory, and in particular relates to a control device for sensing the power supply voltage of an amplifier. Background Art
[0002] Dynamic Random Access Memory (DRAM) is a common type of computer memory used to temporarily store data and instructions. Compared with static random access memory (SRAM), DRAM has higher storage density and lower cost, but has slower read and write speeds and requires regular refresh to retain data.
[0003] DRAM stores data by storing charge in capacitors. Each storage unit consists of a capacitor and an access transistor. When there is charge in the capacitor, it means that the stored value is 1, and when there is no charge, it means that the stored value is 0. Since capacitors naturally leak electricity, they need to be refreshed regularly to prevent data loss.
[0004] Since DRAM is a volatile memory, data will be lost after power failure, so it is usually used as main memory (memory) to temporarily store running programs and data. In modern computer systems, DRAM is usually inserted into the motherboard in the form of a module and communicates with the processor through a memory controller.
[0005] Sense amplifiers are common circuits in dynamic random access memory. The function of the sense amplifier inside the storage array in dynamic random access memory is to sense, amplify, and refresh the data value in the storage cell. When the storage cell shares charge with the bit line, the sense amplifier can compare the small voltage change on the bit line with the original voltage (equilibrium voltage) and amplify it to the voltage extreme value of logic 1 or 0, and then restore the amplified voltage value to the storage cell through the bit line to maintain the integrity of the data.
[0006] In order to reduce the time it takes to read data from the memory array, the sense amplifier is designed to first use a higher potential overdrive voltage as the power supply after it is turned on, allowing it to amplify the voltage change on the bit line more quickly, and then use a slightly lower voltage drive voltage as the power supply to save power consumption.
[0007] In the prior art, when the sensing amplifier is used normally, its potential changes as shown in FIG. Figure 1When the word line is turned on, the capacitor of the storage cell shares charge with the bit line, and the voltage of bit line 1 increases slightly (or may decrease, depending on the data value stored in the capacitor), and then the overdrive voltage and the ground voltage are used to power the sense amplifier. Since the potential of the overdrive voltage is higher, the method speed is also faster. When the potential of bit line 1 is close to the drive voltage, the overdrive voltage stops supplying power and switches to the drive voltage to start supplying power. Since the potential of the drive voltage is lower, the power consumption is lower.
[0008] At the same time, the duration of the overdrive voltage supplying power to the sense amplifier is controlled by the delay circuit inside the dynamic random access memory, and the delay time of the delay circuit is greatly affected by the manufacturing process, operating voltage and operating temperature. When the delay time of the delay circuit becomes longer, the time the sense amplifier uses the overdrive voltage will be greatly extended, causing the power consumption of the sense amplifier to increase when in use. For specific potential changes, see Figure 2 , Figure 2 The overdrive voltage of the existing sense amplifier is charged relative to the delay time of the delay circuit after the delay time becomes longer. Figure 1 There is a significant increase, which significantly increases the power consumption of the sense amplifier.
[0009] Therefore, it is necessary to design an over-driving voltage control device that can stop charging the over-driving voltage when the over-driving voltage supplies power to the sensing amplifier, so as to reduce the power consumption of the sensing amplifier. Utility Model Content
[0010] The utility model provides a control device for the power supply voltage of a sensing amplifier, which can provide a high-potential over-driving voltage when the sensing amplifier starts to work according to operation requirements, and can reduce the power consumption of the sensing amplifier.
[0011] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.
[0012] In order to achieve one or part or all of the above purposes or other purposes, a control device for the power supply voltage of a sensing amplifier provided by a technical solution of the utility model includes an overdrive voltage connected to the sensing amplifier, the overdrive voltage is connected to the overdrive voltage driver; and also includes a comparison device, the comparison end of the comparison device is respectively connected to the overdrive voltage and the overdrive voltage reference voltage, the output end of the comparison device is connected to the overdrive voltage driver, and the comparison device is controlled to be turned on and off by the overdrive voltage charging signal. The beneficial effect of this technical solution is that the comparison device is used to compare the magnitude of the reference voltage and the overdrive voltage, and then the overdrive voltage is stabilized at the magnitude of the reference voltage through the overdrive voltage driver. At the same time, the charging timing of the overdrive voltage is controlled by the overdrive voltage charging signal, and the overdrive voltage charging signal is integrated into the power supply signal circuit of the sensing amplifier, which has the advantages of high integration and intelligent control. When the overdrive voltage supplies power to the sensing amplifier, the overdrive voltage charging signal is turned off, and the overdrive voltage slowly decreases, which can effectively reduce the power consumption of the sensing amplifier.
[0013] The overdrive voltage driver includes a power supply voltage outputting a voltage higher than the overdrive voltage;
[0014] a switch controller connected to an output terminal of the comparison device;
[0015] The power supply voltage is connected to the overdrive voltage to supply power to the overdrive voltage;
[0016] The switch controller is used to receive the output terminal signal of the comparison device to control the on and off of the power supply voltage to the over-driving voltage circuit.
[0017] The comparison device is a voltage comparator; the switch controller is a MOSFET switch.
[0018] The output terminal of the comparison device outputs high and low levels to the gate of the MOSFET switch.
[0019] A grounding resistor is also provided after the power supply voltage is connected to the over-driving voltage.
[0020] A capacitor is further provided between the over-driving voltage driver and the sensing amplifier, one end of the capacitor is connected to the over-driving voltage, and the other end is grounded.
[0021] Also included is a signal control circuit, the signal control circuit including a word line control signal input;
[0022] A ground voltage supply signal output, an overdrive voltage supply signal output, a drive voltage supply signal output, a word signal output and an overdrive voltage charging signal output respectively connected to the word line control signal input terminal;
[0023] The word line control signal is connected to the overdrive voltage charging signal through two signals;
[0024] A delay device a is provided between the word line control signal and the signal a in the two-path signal;
[0025] A NOT gate circuit is arranged on the signal a of the delay device, and the two signal output ends between the word line control signal and the over-driving voltage charging signal are commonly connected to the NAND gate circuit.
[0026] Two signals are provided between the word line control signal and the overdrive voltage supply signal, and a delay device b is provided between the word line control signal and a signal b in the two signals;
[0027] The signal b is also provided with a NOT gate circuit, and the two signal output ends between the word line control signal and the over-driving voltage supply signal are commonly connected to the NAND gate circuit.
[0028] The word line control signal input terminal and the over-drive voltage charging signal output terminal are both triggered by a high level; the over-drive voltage supply signal is triggered by a low level.
[0029] The delay device a is a delay device 1 and a delay device 3, and the delay device b is a delay device 1 and a delay device 2;
[0030] The delay time of the delay device 3 is longer than the delay time of the delay device 2.
[0031] Compared with the prior art, the beneficial effects of the utility model mainly include: the utility model device compares the overdrive voltage with the reference voltage through a voltage comparator, and the overdrive voltage outputs a signal to the drive voltage driver, so that the output voltage is consistent with the reference voltage. At the same time, the opening timing of the voltage comparator is controlled by an overdrive voltage control signal. When the overdrive voltage starts to supply power to the sensing amplifier, the overdrive voltage charging signal is turned off, and the overdrive voltage slowly decreases. When the overdrive voltage completes supplying power to the sensing amplifier, the sensing amplifier is powered by a drive voltage with a lower potential, which can avoid the overdrive voltage from maintaining a high potential for a long time, thereby effectively reducing power consumption.
[0032] At the same time, the over-drive voltage charging signal is integrated into the power supply signal circuit of the sensing amplifier, which has the advantages of high integration and intelligent control.
[0033] In order to make the above and other purposes, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below with reference to the accompanying drawings for detailed description as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0034] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0035] Figure 1 It is a schematic diagram of the potential change of the sensing amplifier in the prior art during normal use.
[0036] Figure 2 It is a schematic diagram of the potential change of the sensing amplifier in the prior art after being affected by the delay time of the delay circuit.
[0037] Figure 3 It is a schematic diagram of the device of the utility model.
[0038] Figure 4 It is a schematic diagram of the overall device of a specific structure of the overdrive voltage driver in the utility model.
[0039] Figure 5 It is a schematic diagram of potential change when the sensing amplifier of the utility model is used.
[0040] Figure 6 This is a signal control circuit diagram of the device of the utility model.
[0041] Figure 7 for Figure 6 Schematic diagram of the pulse width of each waveform of each power supply signal in the circuit diagram. DETAILED DESCRIPTION
[0042] The above and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.
[0043] Example 1
[0044] Embodiment 1 provides a sensing amplifier power supply voltage control device, see Figure 3 , specifically including a voltage comparator, the comparison end of the voltage comparator inputs the reference voltage of the over-drive voltage and the over-drive voltage respectively, the voltage comparator stabilizes the over-drive voltage near the reference voltage and maintains it by comparing the over-drive voltage reference voltage and the over-drive voltage, and when the sensing amplifier is started up, the over-drive voltage driver stops working.
[0045] At the same time, a capacitor is connected between the overdrive voltage and the ground terminal. The capacitor is set between the sensing amplifier and the overdrive voltage driver. The capacitor can also play the role of powering the sensing amplifier, that is, the overdrive voltage driver is used to charge the capacitor, and the capacitor then charges the sensing amplifier, which can effectively reduce voltage fluctuations. At the same time, the capacitor can also be discharged during the period when the overdrive voltage driver stops working to ensure that the overdrive voltage potential remains unchanged or slowly decreases. In the following description of the signal control circuit, the overdrive voltage charging signal is turned off at delay time 1, and the overdrive voltage power supply is turned on at delay time 2. This is the reason.
[0046] Of course, in order to enable the overdrive voltage to respond quickly and charge quickly, the overdrive voltage should not be reduced too much, that is, the voltage comparator will not be turned off for a long time.
[0047] See also Figure 2 A specific structure of an overdrive voltage driver in the invention, the overdrive voltage driver includes a switch device, the switch device is a low-level triggered pmos, the output end of the voltage comparator is connected to the gate of the pmos, the switch device is arranged on a power supply voltage and an overdrive voltage connection circuit, wherein the power supply voltage has a higher potential than the overdrive voltage, and can charge the overdrive voltage to the potential of a reference voltage after the switch device is triggered. A grounding resistor is also arranged on the circuit connecting the power supply voltage to the drive voltage.
[0048] In order to control the power supply duration of the overdrive voltage, an overdrive voltage charging signal control circuit is also provided on the existing signal control circuit. The overdrive voltage charging signal is used to control the opening and closing of the voltage comparator. Figure 6 , Figure 6 The control signal circuit diagram in includes a word line control signal at the input end and a ground voltage supply signal, an overdrive voltage supply signal, a drive voltage supply signal, a word line signal, and an overdrive voltage charging signal at the output end respectively connected to the word line control signal. The word line control signal is a high level trigger. When the signal circuit starts working, the word line control signal outputs a high level, and after the signal passes through the internal delay circuit 1, the high level signal reaches the ground voltage supply signal output end after a delay time 1 (the time corresponding to the delay circuit 1), and the ground voltage supply signal is a high level trigger, and the ground voltage supply signal is output at this time.
[0049] The overdrive voltage supply signal and the drive voltage supply signal are both low-level triggered. When there is no high-level input of the word line control signal, the output end of the overdrive voltage supply signal and the NAND gate circuit of the drive voltage supply signal output a high level, and at this time, the overdrive voltage supply signal and the drive voltage supply signal are not output. When the word line control signal is input at a high level, after the delay time 1 of the delay circuit 1, the input ends of the NAND gate are both high levels, then the NAND gate outputs a low level to the overdrive voltage supply signal, and the overdrive voltage supply signal starts to output after being triggered (that is, it is a high-level output within the delay time 1). In order to ensure the integrity of the timing, the delay time 1 and the delay time 2 should be continuous. After the delay time 1, during the delay time 2, both ends of the NAND gate circuit are high-level inputs, and the NAND gate outputs a low level to the overdrive voltage supply signal, and at this time, the overdrive voltage supply signal starts to output. After the delay time 2 of the delay circuit, the NOT gate circuit on the delay circuit 2 outputs a low level to the NAND gate circuit, the NAND gate circuit input is a low level and a high level, and the NAND gate circuit outputs a high level to the overdrive voltage supply signal. Figure 7 In the pulse width diagram, the overdrive voltage supply signal is triggered at a low level during the delay time 2, and the overdrive voltage supplies power to the sense amplifier.
[0050] The output principle of the driving voltage supply signal is the same as the output of the overdriving voltage supply signal described above, and will not be repeated here.
[0051] The overdrive voltage charging signal in the utility model is a newly added power supply circuit based on the existing charging signal circuit (that is, the output end is the ground voltage power supply signal, the overdrive voltage power supply signal, the drive voltage power supply signal, and the word line), including two paths, one of which is connected to the delay circuit 3 after the word line control signal passes through the delay circuit 1, and a NOT gate circuit is connected to the NAND gate circuit on the path, and finally connected to the NAND gate circuit, and the other path is directly connected to the NAND gate circuit from the word line control signal, and finally the output end of the NAND gate is the overdrive voltage charging signal. The principle of realizing the overdrive voltage power supply duration control is: one end of the input end of the NAND gate circuit at the output end of the overdrive voltage charging signal is always a high-level signal, and only in the two time periods of delay circuit 1 and delay circuit 3 after the word line control signal becomes high, the NAND gate circuit will output a high level to the NAND gate circuit, at this time the NAND gate circuit outputs a low level, the overdrive voltage charging signal stops outputting, and the overdrive voltage charging signal is output at high levels at other times. That is, only during the delay time 1 and the delay time 3, the overdrive voltage charging signal will not turn on the voltage comparator. See Figure 7, in order to ensure the continuity of timing, delay time 1 and delay time 3 are continuous, and delay time 3 is longer than delay time 2. At this time, within delay time 1 + delay time 3, the overdrive voltage charging signal is turned off, and delay time 2 is the turn-on time of the overdrive voltage power supply signal. In the period before and after delay time 2, the voltage comparator will not be turned on, and the power supply voltage will stop charging the overdrive voltage. During delay time 2, the overdrive voltage supplies power to the sense amplifier through the capacitor, and its potential will slowly decrease to reduce energy consumption during delay time 2 (due to manufacturing process, delay circuit voltage and temperature). After delay time 3, the power supply voltage supplies power to the overdrive voltage, so that the overdrive voltage potential is maintained until the next charging cycle arrives.
[0052] When the sensing amplifier of the utility model is used, the potential changes as follows Figure 5 As shown, when the over-drive voltage supplies power to the sensing amplifier, the over-drive voltage charging signal is turned off (the over-drive voltage charging signal is turned off for longer than the over-drive voltage supply time), causing the potential of the over-drive voltage to slowly decrease. After the over-drive voltage stops supplying power to the sensing amplifier, the over-drive voltage charging signal is turned on, causing the potential of the over-drive voltage to return to the reference potential value.
[0053] The above is a detailed introduction to a sensing amplifier power supply voltage control device provided by the utility model. This article uses specific examples to illustrate the structure and working principle of the utility model. The description of the above embodiments is only used to help understand the method and core idea of the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.
Claims
1. A control device for sensing the supply voltage of an amplifier, comprising an overdrive voltage connected to the sensing amplifier, characterized in that: The overdrive voltage is connected to an overdrive voltage driver; It also includes a comparison device, wherein the comparison end of the comparison device is respectively connected to the over-driving voltage and the over-driving voltage reference voltage, the output end of the comparison device is connected to the over-driving voltage driver, and the comparison device is controlled to be turned on and off by the over-driving voltage charging signal.
2. The control device for sensing the power supply voltage of an amplifier according to claim 1, characterized in that: The overdrive voltage driver includes a power supply voltage outputting a voltage higher than the overdrive voltage; a switch controller connected to an output terminal of the comparison device; The power supply voltage is connected to the overdrive voltage to supply power to the overdrive voltage; The switch controller is used to receive the output terminal signal of the comparison device to control the on and off of the power supply voltage to the driving voltage circuit.
3. The control device for sensing the power supply voltage of an amplifier according to claim 2, characterized in that: The comparison device is a voltage comparator, and the switch controller is a MOSFET switch.
4. The control device for sensing the power supply voltage of an amplifier according to claim 3, characterized in that: The output terminal of the comparison device outputs high and low levels to the gate of the MOSFET switch.
5. The control device for sensing the power supply voltage of an amplifier according to claim 2, characterized in that: A grounding resistor is also provided after the power supply voltage is connected to the over-driving voltage.
6. The control device for sensing the power supply voltage of an amplifier according to claim 1, characterized in that: A capacitor is further provided between the over-driving voltage driver and the sensing amplifier, one end of the capacitor is connected to the over-driving voltage, and the other end is grounded.
7. The control device for sensing the power supply voltage of an amplifier according to claim 1, characterized in that: Also included is a signal control circuit, the signal control circuit including a word line control signal input; A ground voltage supply signal output, an overdrive voltage supply signal output, a drive voltage supply signal output, a word signal output and an overdrive voltage charging signal output respectively connected to the word line control signal input terminal; The word line control signal is connected to the overdrive voltage charging signal through two signals; A delay device a is provided between the word line control signal and the signal a in the two-path signal; A NOT gate circuit is arranged on the signal a of the delay device, and the two signal output ends between the word line control signal and the over-driving voltage charging signal are commonly connected to the NAND gate circuit.
8. The control device for sensing the power supply voltage of an amplifier according to claim 7, characterized in that: Two signals are provided between the word line control signal and the overdrive voltage supply signal, and a delay device b is provided between the word line control signal and a signal b in the two signals; The signal b is also provided with a NOT gate circuit, and the two signal output ends between the word line control signal and the over-driving voltage supply signal are commonly connected to the NAND gate circuit.
9. The control device for sensing the power supply voltage of an amplifier according to claim 8, characterized in that: The word line control signal input terminal and the over-drive voltage charging signal output terminal are both triggered by a high level; the over-drive voltage supply signal is triggered by a low level.
10. The control device for sensing the power supply voltage of an amplifier according to claim 7, characterized in that: The delay device a is a delay device 1 and a delay device 3, and the delay device b is a delay device 1 and a delay device 2; The delay time of the delay device 3 is longer than the delay time of the delay device 2.