Design of Spurious Dynamic Inverter-Based Level Shifter with Error Tolerance for Robotic Arm Controller

In robotic arm controllers, the ability to shift signal levels is crucial for interfacing between different voltage domains in a processor. The level shifter (LS) has been used to convert signals operating near threshold voltage to signals operating well above the threshold voltage. Researchers have developed current mirror-based LSs to employ current mirrors, which duplicate the current from one transistor and accurately replicate it in another, ensuring precise current matching. In this research, a dynamic inverter-based level shifter (DIBLS) with an error correction circuit is implemented. One of the main issues addressed by DIBLS is the problem of current disagreement. Current disagreement arises when multiple circuit components attempt to draw current from a common source, which leads to operational problems. Furthermore, DIBLS includes a feedback inverter controlled by the output node; this feedback inverter likely plays a pivotal role in controlling and stabilizing the output voltage of operation of the LS. The results demonstrate that DIBLS offers notable advantages on increased operational speed. This speed improvement has been achieved by circumventing the threshold voltage drop associated with the feedback of the inverter and by ensuring complete output swing, addressing stability issues. Voltage shifting between 0.3 V and 1.2 V at 1 MHz having power consumption is 16.57 nW, delay 0.22 ns, and energy per transition 32.25 fJ. The entire process is executed in 45 nm in CMOS technology.