FREQUENCY DETECTION CIRCUITS, RADIO FREQUENCY SIGNAL PROCESSING DEVICES AND METHODS FOR CALIBRATING INDUCTANCE AND CAPACITANCE

摘要

A frequency detection circuit includes a filter, a power detector and a voltage comparator. The filter receives and filters a converted signal to generate a filtered signal. The power of the filtered signal relates to a frequency of the converted signal. The power detector generates a voltage according to the power of the filtered signal. The voltage comparator compares the voltage with multiple reference voltages to generate multiple comparison results. At least one of the inductance and capacitance of an LC tank in an amplifier is adjusted according to the comparison results.

主权项

1. A frequency detection circuit, comprising:
a filter, receiving and filtering a converted signal to generate a filtered signal, wherein a power of the filtered signal relates to a frequency of the converted signal; a power detector, coupled to the filter for generating a voltage according to the power of the filtered signal; and a voltage comparator, comparing the voltage with a plurality of reference voltages to generate a plurality of comparison results, wherein at least one of an inductance and a capacitance of an LC tank in an amplifier is adjusted according to the comparison results.