A photoelectric DC servo replaces the gate-bias resistor in capacitive preamps, achieving 11 dBA self-noise in a 12 pF ECM capsule by using a custom zinc photocathode sensor and lag-lead compensation.
A 0.3 nV/√Hz input-referred-noise analog front-end for radiation-induced thermo-acoustic pulses
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Self-Noise Reduction for Capacitive Sensors via Photoelectric DC Servo: Application to Condenser Microphones
A photoelectric DC servo replaces the gate-bias resistor in capacitive preamps, achieving 11 dBA self-noise in a 12 pF ECM capsule by using a custom zinc photocathode sensor and lag-lead compensation.