Invensense, Inc.

Dusan Vecera

Igor Mucha

Miroslav Svajda

Technologies are provided for adaptive control of bias settings in a digital microphone. In some embodiments, a device includes a first component that provides data indicative of a clock frequency of operation in a functional mode of a digital microphone. The clock frequency clocks one or more microphone components having switching activity. The device also can include a second component that determines, using the clock frequency, an amount of bias current to supply to at least a first microphone component of the one or more microphone components. The device can further include a memory device that retains control parameters that include at least one of a first subset of parameters defining a relationship between current and frequency and a second subset of parameters defining a quantization of the relationship. The quantization including multiple bias current levels for respective frequency intervals.

Adaptive control of bias settings in a digital microphone

An analog-to-digital converter (ADC) with split-gate laddered-inverter quantizer is presented herein. The ADC converts, via the split-gate laddered-inverter quantizer, an analog input voltage into a digital output value. The split-gate laddered-inverter quantizer separately couples, during respective phases of a clock signal via respective capacitances, a reference voltage and an input voltage corresponding to the analog input voltage to P-type metal-oxide-semiconductor (PMOS) gates of a PMOS branch of the split-gate laddered-inverter quantizer and N-type metal-oxide-semiconductor (NMOS) gates of an NMOS branch of the split-gate laddered-inverter quantizer to optimize current flow at respective frequencies. Further, the split-gate laddered-inverter quantizer separately biases, during the respective phases of the clock signal, the NMOS gates and the PMOS gates at respective bias voltages to optimize the current flow at the respective frequencies.

Analog-to-digital converter with split-gate laddered-inverter quantizer

A low power bandgap circuit device that generates temperature independent reference voltages and/or zero temperature coefficient currents is disclosed. The circuit comprises a first pair of transistors, an amplifier, a star connected resistive network, and a second pair of transistors, wherein zero temperature coefficient currents are generated through mirroring and reuse of current from the star connected resistive network.

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Stupava, Slovakia

Dusan Vecera