Infineon Technologies Ag

Hong Chen

Andreas Wiesbauer

Michael Reinhold

Juergen Roeber

Jose Luis Ceballos

Niccoló De Milleri

Dietmar Straeussnigg

Benno Muehlbacher

Bernhard Wotruba

Fulvio CiCiotti

Fulvio Ciciotti

Simon Gruenberger

A microphone includes a first resistor circuit for receiving a bias voltage; an offset reduction circuit coupled to the first resistor circuit; a second resistor circuit coupled to the offset reduction circuit; an amplifier coupled to the second resistor circuit configured for receiving an input signal and generating an output signal; and a capacitor circuit coupled to the amplifier, the offset reduction circuit, and the second resistor circuit.

Offset reduction for silicon microphones

According to an embodiment, a digital microphone includes an analog-to-digital converter (ADC) for receiving an analog input signal; a DC blocker component coupled to the ADC; a digital low pass filter coupled to the DC block component; and a nonlinear compensation component coupled to the digital low pass filter for providing a digital output signal.

Digital non-linearity compensation in a silicon microphone

A device includes a readout circuit coupled between an input node and an output node; a microelectromechanical systems (MEMS) device coupled to the input node; and a first charge controlled clamp circuit coupled between the input node and a first bias node.

Charge controlled clamp for MEMS readout circuits

A single-ended to differential converter includes a converter input, a first converter output, a second converter output, and an internal node, wherein the first converter output and the second converter output comprise a differential output; a non-inverting amplifier having an input coupled to the converter input, and an output coupled to the first converter output; an inverting amplifier having an input coupled to the first converter output, and an output coupled to the second converter output; a charge pump having a charge pump output capacitor coupled between the second converter output and the internal node; and a feedback capacitor coupled between the first converter output and the internal node.

Single to differential conversion in silicon microphone amplifiers

A microphone includes a MEMS device having an output node for generating an analog voltage in response to an input sound wave or vibration; a source follower having a control node coupled to the output node of the MEMS device, a current path coupled between a first controlled node and a second controlled node, and a bulk node, wherein the first controlled node is configured for providing a microphone output voltage, and wherein the second controlled node is coupled to a reference voltage; a current source coupled to the first controlled node; and a voltage differential between the first controlled node and the bulk node, wherein a nonzero value of the voltage differential is configured such that a first 1% total harmonic distortion (THD) cross-point of the microphone output voltage is greater than a second 1% THD cross-point of the microphone output voltage using a zero value voltage differential.

Linearization method applied to a MEMS microphone system

A microphone includes an amplifier coupled to an input node of the microphone; a shock detector coupled to the input node of the microphone; and a recovery circuit having an input coupled to an output of the shock detector, and an output coupled to the input of the microphone.

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Villach, Austria

Hong Chen