Abstract:
The present invention relates to a condenser microphone assembly comprising an electro-acoustic transducer element comprising a diaphragm and a back plate, signal processing circuitry operatively connected to the transducer element so as to process signals generated by the transducer element, and a mode-setting circuitry for selectively setting the condenser microphone assembly in a test mode or an operational mode. The electro-acoustic sensitivity of the condenser microphone assembly, when operated in the test mode, is at least 40 dB lower than the corresponding electro-acoustic sensitivity of the assembly when operated in the operational mode. The present invention further relates to a method for determining a performance parameter of a signal processing circuitry mounted inside a housing of an assembled condenser microphone assembly.
Abstract:
The electronic circuit (10)comprises an input stage (Pre_amp)for pre-amplifying an electrical input signal of the electronic circuit (10)provided by a transducer (MEMS). Furthermore, the electronic circuit (10)comprises an output stage (T_amp)for providing a microphone output signal by processing an output signal of the input stage (Pre_amp). The electronic circuit (10)comprises an adjustable output load (RS)arranged and configured for setting a current draw of the output stage (T_amp). Additionally, the electronic cir- cuit (10)comprises a measurement circuit(P_det)configured to capture the output signal of the input stage (Pre_amp)and an automatic control circuit (ACC) configured to adjust the adjustable output load (RS)dependent on the captured output signal of the input stage (Pre_amp).
Abstract:
An integrated circuit arrangement (20) for a microphone (12) comprises an amplifier circuit (22) and a control unit (30). The amplifier circuit (22) comprises a first switchable network circuit (26) for adjusting an amplifier current of the amplifier circuit (22). The first switchable network circuit (26) comprises a plurality of switches (SW1, SWx) each coupled with a first control port of the first switchable network circuit (26). The control unit (30) is coupled with the first control port of the first switchable network circuit (26) and is configured to control a setting of the respective switches ( SW1, SWx) of the first switchable network circuit (26).
Abstract:
The impedance circuit (BigR) comprises a first current mirror circuit (CM1) with a first bias (pbias) serving as a current input terminal, a first output (outl) serving as a current output terminal and a first input (inl) for coupling with a pre-selected potential. Furthermore the impedance circuit (BigR) comprises a first charge pump (CP1) for biasing the first current mirror circuit (CM1) with a first reference current, wherein the first charge pump (CP1) comprises a first biasing output (biasl) coupled with the first bias (pbias) of the first current mirror circuit (CM1).
Abstract:
A charge pump assembly allowing MEMS microphones being temperature-compensated in a large temperature range and corresponding microphones are provided. An assembly comprises a charge pump and a bias circuit electrically connected to the charge pump. A bias voltage provided by the bias circuit has a temperature dependence.
Abstract:
A microphone assembly (1) is provided, the assembly comprising a transducer (2) and an electronic circuit (3) operatively connected to the transducer (2). The electronic circuit (3) comprises a test mode circuitry (12) for selectively setting the microphone assembly (1) in one or more test modes or an operational mode. The test modes enable determining at least one parameter of the transducer (2). Furthermore, a method is provided, the method enabling determining at least one parameter of a transducer (2) in a microphone assembly (1).
Abstract:
The present invention concerns a MEMS microphone assembly (1), comprising a MEMS transducer element (2) comprising a back plate (17) and a diaphragm (18) displaceable in relation to the back plate (17), a bias voltage generator (6) adapted to provide a DC bias voltage applicable between the diaphragm (18) and the back plate (17), an amplifier (7) for receiving an electrical signal from the MEMS transducer element (2) and for providing an output signal, the amplifier (7) being adapted to amplify the electrical signal from the MEMS transducer element (2) according to an amplifier gain setting, and a processor (8) adapted to carry out a calibration routine at power-on of the microphone assembly (1) determining information regarding the DC bias voltage and/or the amplifier gain setting. Furthermore, the present invention concerns a method of operating said MEMS microphone assembly.
Abstract:
The present invention relates to an integrated circuit comprising at least one supply voltage terminal (262) configured to receive a supply voltage for operation of the integrated circuit, at least one input terminal (122, 124, 222) configured to receive an analog input signal corresponding to an audio signal, and at least one output terminal (132, 134, 232) configured to provide an analog output signal. The integrated circuit further comprises a signal strength detector configured to detect the signal strength of the analog input signal. The integrated circuit is configured to amplify the audio signal based on the detected signal strength and to output a corresponding amplified signal at the at least one output terminal (132, 134), and a signaling circuit configured to indicate an amplification setting of the integrated circuit at the at least one supply voltage terminal (262) or the at least one output terminal (132, 134, 232). The invention further relates to a circuit assembly (100, 200, 300) comprising a signal source (110), a signal processing device (190, 390) and an amplification circuit and a method for operating such a circuit assembly (100, 200, 300).
Abstract:
An electronic circuit (1) for a microphone (2) comprises a first terminal (4) and a second terminal (8), wherein the electronic circuit (1) is selectively operable in a first mode and a second mode. In the first mode, the first terminal (4) is configured for microphone output and in the second mode, the second terminal (7) is configured for microphone output. Furthermore, a method of operating a microphone (2) is provided.
Abstract:
The present disclosure concerns a microphone assembly (1) comprising a MEMS dual backplate microphone (2) configured to provide a differential output signal, an ASIC (3) comprising a differential amplifier (9) configured to receive the differential output signal, and a control element (14) configured to adjust a setting of the MEMS dual backplate microphone (2) and/or of the ASIC (3). Further, the present disclosure concerns a method of manufacturing said microphone assembly.