Transistor body bias control circuit for SRAM cells
Abstract:
A semiconductor memory circuit includes a SRAM cell and a bias control circuit for biasing the SRAM cell. The SRAM cell includes pull-up, pull-down, and pass-gate transistors. The bias control circuit is connected to body terminals of the pull-down and pass-gate transistors for providing a bias voltage. The bias control circuit controls threshold voltages of the pull-down and pass-gate transistors by way of the bias voltage. The bias voltage, which is temperature dependent, is generated based on junction leakages at the body terminals of the pull-down and pass-gate transistors. The use of a temperature-dependent bias voltage to bias the body terminals of the pull-down and pass-gate transistors ensures that the write margin and the static noise margin (SNM) of the SRAM cell are relatively constant and above acceptable levels over a defined temperature range.
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