Abstract: An RC calibration method and an RC calibration circuit are provided. The method includes: providing an RC calibration circuit; calculating a ratio of an input period of an input clock signal to an initial period, and configuring the processing circuit to perform a calibration process including: adjusting a first current source, a second current source, and/or an adjustment factor of the input period according to the ratio, so as to satisfy a specified RC product, or adjusting a resistance and/or a capacitance of the specified RC product; controlling the first current source to charge a to-be-calibrated capacitor; and determining whether a comparison signal indicates that first and second voltages meet a calibration completion condition, and if not, adjusting the to-be-calibrated resistor and/or the to-be-calibrated capacitor until the comparison signal indicates that the first and second voltages meet the calibration completion condition.

Abstract: A radio frequency receiving circuit includes a first amplification circuit, an oscillation circuit, a frequency mixing and amplification circuit and a dividing circuit. The first amplification circuit is configured to amplify an input signal so as to generate an amplified input signal. The oscillation circuit is configured to provide a local oscillation signal. The frequency mixing and amplification circuit is configured to mix and amplify the amplified input signal according to the local oscillation signal. The dividing circuit is configured to form a dividing loop at a preset frequency for the amplified input signal according to the local oscillation signal when the dividing circuit is driven. A chip including the radio frequency receiving circuit and a main circuit is also provided. The main circuit is configured to drive the dividing circuit when the second input signal is determined to include a signal of the preset frequency.

Abstract: A radio frequency receiving circuit includes a first amplification circuit, an oscillation circuit, a frequency mixing and amplification circuit and a dividing circuit. The first amplification circuit is configured to amplify an input signal so as to generate an amplified input signal. The oscillation circuit is configured to provide a local oscillation signal. The frequency mixing and amplification circuit is configured to mix and amplify the amplified input signal according to the local oscillation signal. The dividing circuit is configured to form a dividing loop at a preset frequency for the amplified input signal according to the local oscillation signal when the dividing circuit is driven. A chip including the radio frequency receiving circuit and a main circuit is also provided. The main circuit is configured to drive the dividing circuit when the second input signal is determined to include a signal of the preset frequency.