VCO-ADC with frequency-controlled switched-capacitor feedback for linearization
AssigneeInfineon Technologies AG
InventorsLuis Hernandez, Ruben Garvi Jimenez-Ortiz, Andreas Wiesbauer
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Abstract
An analog-to-digital converter (ADC) includes a first controlled oscillator (CO) for generating at least one phase signal, and wherein the at least one phase signal generates a first output signal of the ADC; and at least one first frequency-controlled resistor (FDR) for receiving the at least one phase signal generated by the first CO, wherein the first CO and the at least one first FDR are coupled together at a first subtraction node of the ADC, and wherein the first subtraction node receives a first input signal.
Claims20
An analog-to-digital converter (ADC) comprising:
- a first controlled oscillator (CO) configured for generating at least one phase signal, and wherein the at least one phase signal is configured for generating a first output signal of the ADC;
- and
- at least one first frequency-controlled resistor (FDR) configured for receiving the at least one phase signal generated by the first CO,
- wherein the first CO and the at least one first FDR are coupled together at a first subtraction node of the ADC, and wherein the first subtraction node is configured for receiving a first input signal.
A digital microphone comprising:
- a microelectromechanical system (MEMS) device;
- an application-specific integrated circuit (ASIC), wherein the ASIC comprises an analog-to-digital converter (ADC) coupled to the MEMS device, and at least one digital signal processing component coupled to the ADC, wherein the ADC comprises a first controlled oscillator (CO) coupled to a first plurality of frequency-controlled resistors (FDRs), configured for receiving phase signals generated by the first CO, and wherein the first CO and the first plurality of FDRs are coupled to a first subtraction node of the ADC.
A method comprising:
- generating a first plurality of phase signals in a first controlled oscillator (CO) in response to a first input signal;
- controlling a first plurality of frequency-dependent resistors (FDRs) with the phase signals generated by the first CO;
- coupling the first CO and the first plurality of FDRs to a first feedback node;
- and
- generating a first output signal with at least one of the first plurality of phase signals.
Dependencies are inferred from the claim text.