Hi everyone,
I'm studying in deep a circuit I've found in a TechNote of Texas Instruments(amplifier for electret microphone) for my "Sensors and Transducers" examination. Could I know how describe the filtering operations and the filters model used in the two stage of the circuit? I didn't understand so well the the explanation. This is the comment in the description:
"This single-supply +5 V circuit uses both op amp channels to provide a total of 40 dB of gain (20 dB/stage) in combination with second-order high-pass and low-pass filters.....Low-pass filters are formed by combining the feedback capacitor and feedback resistor, which sets the cutoff frequencies to fc = 1/(2piRC). High-pass filters are formed by combining the amplifier’sinput impedance and the input capacitors setting the cutoff frequencies to fc = 1/(2piRC).A high-frequency low-pass filter is formed by combining the ECM load resistor and C3,the 33 pF shunt capacitor...". I insert the image of the circuit.
th0572.circuito.pdfanks!
regards.