Electronic circuit for a microphone and method of operating a microphone

1. An electronic circuit for processing a signal of a transducer microphone and for providing a processed output signal, the electric circuit comprising:

a first terminal; and a second terminal,

wherein the electronic circuit is selectively operable in a first mode and a second mode, wherein, in the first mode, the first terminal is configured for providing the processed output signal of the transducer microphone;

wherein, in the second mode, the second terminal is configured for providing the processed output signal of the transducer microphone;

wherein, in the first and second modes, the first terminal is configured for power supply; wherein the first mode is a two-terminal mode wherein power and output of the electronic circuit are provided at a single terminal and ground is provided at a further terminal; and wherein the second mode is a three-terminal mode wherein separate terminals are provided for each of power, ground and output.

2. The electronic circuit of claim 1 , further comprising a memory for setting the electronic circuit in the first or second mode.

3. The electronic circuit of claim 1 , further comprising at least one switchable resistor.

4. The electronic circuit of claim 3 , wherein, in the first mode, the switchable resistor is switched on.

5. The electronic circuit of claim 3 , further comprising a signal input for receiving a signal from a transducer, wherein the switchable resistor is located in an electric path between the signal input and the second terminal.

6. The electronic circuit of claim 1 , further comprising a third terminal configured for ground.

7. The electronic circuit of claim 6 , further comprising a signal input for receiving a signal from a transducer, wherein a switchable resistor is located in an electric path between the signal input and the third terminal.

8. The electronic circuit of claim 2 , further comprising at least one switch controllable by the memory for switching on a switchable resistor.

9. The electronic circuit of claim 3 , wherein the switchable resistor is tunable.

10. The electronic circuit of claim 9 , wherein a memory controls a tuning of the switchable resistor.

11. The electronic circuit of claim 1 , wherein the electronic circuit is an application-specific-integrated circuit (ASIC).

12. A microphone comprising:

a transducer; and

an electronic circuit for processing a signal of the microphone and for providing a processed output signal, the electric circuit comprising a first terminal and a second terminal;

wherein the electronic circuit is selectively operable in a first mode and a second mode;

wherein, in the first mode, the first terminal is configured for providing the processed output signal of the transducer microphone;

wherein, in the second mode, the second terminal is configured for providing the processed output signal of the transducer microphone;

wherein, in the first and second modes, the first terminal is configured for power supply;

wherein the first mode is a two-terminal mode wherein power and output of the electronic circuit are provided at a single terminal and ground is provided at a further terminal; and

wherein the second mode is a three-terminal mode wherein separate terminals are provided for each of power, ground and output.

13. The microphone of claim 12 , wherein the transducer is fabricated in MEMS (Micro-Electrical-Mechanical Systems) technology.

14. A method for operating the microphone of claim 12 , the method comprising:

selecting the first or second mode; and

operating the microphone in the selected mode.

15. The electronic circuit of claim 1 , further comprising an amplifier for amplifying a signal of the transducer microphone, wherein processing the signal includes an amplification of the signal.