| 摘要 |
An apparatus, having as an input an analog signal, is provided. The apparatus comprises a first circuit comprising an impedance transferring circuit configured to band pass filter the input signal, obtaining a filtered signal; the impedance transferring circuit comprising: a transconductance amplifier (1102), and a switching arrangement (1106, 1108) and an impedance circuit (404) connected in series, the switching arrangement being configured to switch the impedance of the impedance circuit of the impedance transferring circuit from base band to the frequency of the input signal. The apparatus further comprises a second circuit (1112) configured to perform down mixing to the filtered signal obtaining a base band signal and a feedback loop connecting the base band signal to the switching arrangement (1114, 1116) and the impedance circuit, the signal of the feedback loop configured to control the properties of the first circuit.
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