Patent ID: 7346327

Claim:
A wireless receiving circuit for downconverting high-frequency wireless signals received by an antenna and picking up a signal of a desired channel, the wireless receiving circuit comprising: a first element, a second element, and a third element serially connected in this order between a signal input terminal and a signal output terminal; a first capacitor, one terminal of which is connected to an input terminal of the second element; and a second capacitor, one terminal of which is connected to an output terminal of the second element, the first capacitor and the second capacitor functioning as a second order low-pass filter by being combined with output impedance of an element immediately preceding the first capacitor and the second capacitor, and input impedance of an element immediately following the first capacitor and the second capacitor wherein the first element is a mixer for downconverting the high-frequency wireless signals by mixing the high-frequency wireless signals with local oscillation signals.