US 12,449,455 B2 · Circuit for determining the frequency of a signal

Abstract

According to various embodiments, a circuit for determining the frequency of a signal is described, comprising an input configured to receive an analog input signal, an analog to digital converter configured to convert the analog input signal to a digital input signal, a digital mixer configured to generate a mixing result signal by mixing the digital input signal with a single bit binary signal having a reference frequency, a low pass filter configured to generate a filtered signal by filtering the mixing result signal, a measuring circuit configured to measure the period of the filtered signal and an output configured to output a value differing from the frequency of the single bit binary signal by the inverse of the measured period as the frequency to be determined.

Claims20

Dependent claims

A circuit for determining a frequency of a signal, comprising:

an input configured to receive an analog input signal;
an analog to digital converter configured to convert the analog input signal to a digital input signal;
a digital mixer configured to generate a mixing result signal by mixing the digital input signal with a single bit binary signal having a reference frequency;
a low pass filter configured to generate a filtered signal by filtering the mixing result signal;
a measuring circuit configured to measure a period of the filtered signal;
and
an output configured to output a value of the frequency of the signal, wherein the frequency of the signal differs from the frequency of the single bit binary signal by a frequency offset determined by an inverse of the measured period.

4 more elements

Dependencies are inferred from the claim text.

Circuit for determining the frequency of a signal

Life of this patent

Circuit for determining the frequency of a signal

Life of this patent

Abstract

Claims20