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AN4598 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN4598 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 12 page DocID026988 Rev 1 7/12 AN4598 Designing the circuit 12 5 Designing the circuit A typical pre-amplification circuit is shown in Figure 2. Figure 2. MEMS microphone amplification circuit R4 and R5 are used to generate a voltage reference to bias the input common mode voltage of the op amp at Vcc/2. C5 allows the noise of the power supply (and of the equivalent R4 and R5 resistors) to be reduced. Generally, this noise would be amplified by the op amp. R6 and C6 create a low pass filter which also helps to reduce noise, resulting in an overall second order, low-pass filtering. R1 and C1 allow AC coupling of the microphone signal. The op amp is DC biased by Vcc/2 and in AC i.e. above ~1/2π R1C1 (16 Hz) its input receives the microphone signal. Note that if the op amp is used with a dual supply configuration, ground is used as the input common mode voltage (R1 is directly connected to ground). R2 and C2 create a high-pass gain so as not to amplify the DC biasing of the op amp (including input offset voltage). The cutoff frequency is fhp = 1/2π R2C2 which is 59 Hz. |
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