Patent ID: 9148184
Filing Date: 2015-09-29
Classification: H04B

Abstract:
1. A power detection circuit comprising: a variable frequency oscillator for oscillating a local oscillator frequency; a mixer for receiving the local oscillator frequency and a detection signal and converting a frequency of the detection signal using the local oscillator frequency; a complex bandpass filter for limiting a bandwidth of the detection signal whose frequency is converted to a predetermined detection bandwidth; and an energy detection circuit for detecting power of the predetermined detection bandwidth based on an output from the complex bandpass filter, wherein the local oscillator frequency is set so that the predetermined detection bandwidth of the detection signal whose frequency is converted is in a frequency range having low 1/f noise, wherein the predetermined detection bandwidth of the complex bandpass filter is variable, and wherein when the predetermined detection bandwidth of the complex bandpass filter is wider than a frequency range with high 1/f noise, the local oscillator frequency is set so that a central frequency of the detection signal whose frequency is converted is Direct Current (DC).