A Low Settling Time Current-Mode Bandgap Reference Circuit for Low Noise Amplifiers
Sari Mohan Das and Kota Venkata Ramanaiah
In analog and mixed-signal circuit applications, the bandgap reference (BGR) circuit generates a reliable output. However, process, voltage, and temperature fluctuations all have an impact on output performance. Capacitors, resistors, and amplifiers increase the size of power supplies. As a result, the trimmer circuit is recommended for the BGR circuit to reduce fluctuations and process extension. Temperature compensation provides better temperature coefficients by adjusting the transistor voltage aspect ratio. The final characteristic curves are corrected to avoid slope variations, and temperature adjustment is required to provide the reference current in the BGR circuit. Temperature coefficients (TC) are calculated using electron mobility, voltage drop across the transistor, and threshold voltage factors. The temperature-dependent threshold voltage generates a low dependency drain current. Temperature reparation is achieved through temperature coefficients, and gate-source voltage is generated in the BGR circuit. Monte Carlo simulation beats efficient methods for identifying process variations and mismatches. Designing cascade current mirrors in the BGR circuit reduces the channel length modulation impact while increasing the resistance value. The trimmer current reference circuit outperforms the efficient reference current 21μ𝐴 at time of 110 to 150 μ𝑆 .
Keywords: Temperature coefficients, trimming circuit, bandgap reference circuit, transistors, and aspect ratio