Patent ID: 11888491
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A frequency detector for measuring and tuning a frequency of a controlled oscillator comprising:
a pulse generator for generating sampling pulses;
a sample circuitry for sampling output states of the controlled oscillator; and
a digital processing unit; wherein
the sample circuitry is configured to sub-sample the output states of the controlled oscillator at two or more sampling frequencies, and wherein the two or more sampling frequencies are lower than the frequency of the controlled oscillator; and
the digital processing unit is configured to calculate a frequency offset of the controlled oscillator based on the sampled output states and generate a control signal based on the frequency offset to tune the frequency of the controlled oscillator.