Systems and methods for generating stagger delays in memory devices
View Patent ↗A semiconductor device may include a number of memory banks, an output buffer that couples to the memory banks, a number of switches that couple a voltage source to the output buffer, and a stagger delay circuit. The stagger delay circuit may include a resistor-capacitor (RC) circuit that outputs a current signal that corresponds to a data voltage signal received by the RC circuit. The stagger delay circuit may also include a logic circuit that determines a strength of the current signal and sends a first gate signal to a first portion of the switches based on the strength.
1. A logic circuit, configured to:
receive a current signal from a resistor-capacitor (RC) circuit, wherein the current signal corresponds to data received by the RC circuit, wherein the output buffer is configured to be written or read via one or more memory banks;
determine a strength of the current signal;
transmit a first gate signal to a first set of switches configured to couple a voltage source to an output buffer configured to couple to the one or more memory banks in response to the strength being above a first threshold; and
transmit a second gate signal to a second set of switches configured to couple the voltage source to the output buffer in response to the strength being below the first threshold.
2. The logic circuit of claim 1 , configured to transmit a third gate signal to a third set of switches configured to couple the voltage source to the output buffer in response to the strength being below a second threshold.
3. The logic circuit of claim 2 , wherein a first time interval between the transmission of the first gate signal and the second gate signal is substantially equal to a second time interval between the transmission of the second gate signal and the third gate signal.
4. The logic circuit of claim 1 , wherein the first threshold is determined based on a target slew rate of a voltage signal provided to the output buffer.
5. The logic circuit of claim 1 , wherein each switch of the first set of switches and the second set of switches is coupled to each other in parallel.
6. The semiconductor device of claim 1 , wherein the strength of the current signal corresponds to a current value of the current signal.
7. A method, comprising:
receiving, via a circuit, a current signal that corresponds to data to be written or read via one or more memory banks;
transmit, via the circuit, a first gate signal to a first set of switches configured to couple a voltage source to an output buffer, wherein the output buffer is configured to couple to the one or more memory banks in response to the strength of the current signal being above a first threshold;
transmit, via the circuit, a second gate signal to a second set of switches configured to couple the voltage source to the output buffer in response to the strength of the current signal being below the first threshold; and
transmit, via the circuit, a third gate signal to a third set of switches configured to couple the voltage source to the output buffer in response to the strength being below a second threshold.
8. The method of claim 7 , wherein the first threshold and the second threshold are determined based on a target slew rate of a voltage signal applied to the output buffer via the voltage source, the first set of switches, the second set of switches, and the third set of switches.
9. The method of claim 8 , wherein the target slew rate comprises a range of slew rates between a minimum slew rate and a maximum slew rate associated with the one or more memory banks.
10. The method of claim 7 , wherein the first threshold and the second threshold are determined based on a first time interval between the transmission of the first gate signal and the second gate signal and a second time interval between the transmission of the second gate signal and the third gate signal.
11. The method of claim 7 , wherein the strength of the current signal corresponds to a current value of the current signal.
12. The method of claim 7 , wherein the current signal is configured to decrease in value while charging a capacitor of a resistor-capacitor (RC) circuit configured to receive the data.