20volt bias voltage for sensor with a 10v voltage reference and Op-amp, is this circuit loos

The discussion centers on designing a 20V bias voltage circuit for a MEMS sensor using a 10V voltage reference and an operational amplifier. Key concerns include the selection and verification of resistor and component values. It was noted that the MAX876A voltage reference used has a maximum supply voltage of 18V, while the design applies 24V, which is problematic. Suggestions include using a 15V zener diode with a series resistor to regulate the supply voltage. The transistor Q1 requires a collector voltage higher than 20.6V to function correctly, recommending a 24V supply for proper headroom. The LT6274 op-amp can handle up to 32V supply, making it suitable for the 24V input, but pin connections and decoupling capacitor placement were initially incorrect and need correction. The emitter resistor value (200Ω) was questioned due to high quiescent current draw; increasing it to 1kΩ or higher was advised to improve output capability. The necessity of Q1 was questioned since the LT6274 can source/sink up to 15mA, potentially eliminating the transistor. Alternative voltage references like the Maxim REF01CSA+ were suggested for higher input voltage tolerance (up to 33V). The design aims for a precision, near-zero current 20V bias on a compact accel board for density studies, justifying the use of small, expensive components. Overall, the discussion highlights supply voltage constraints, component selection, correct pin configuration, and circuit optimization for stable, precise bias voltage generation.
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