| 摘要 |
PURPOSE:To use a single image cancel mixer in accordance with the magnitude of a receiving frequency and a local oscillating frequency by constituting it so that a local oscillating terminal and a receiving input terminal can be replaced by rotating mechanically a mixer part by 180 deg.. CONSTITUTION:In an image cancel mixer consisting of a mixer MIX, a hybrid HYB, a phase delaying circuit, and a dummy resistance R, these respective component parts are formed as one body. Subsequently, the mixer having this unified structure is rotated by 180 deg. by using a dotted line containing an output terminal IF as an axis, and constituted so that positions of a local oscillating input terminal LO and a receiving input terminal RF can be replaced. In this way, an image cancel mixer which can cope easily with both upper heterodyne and down heterodyne can be offered by replacing the local oscillating terminal and the receiving input terminal in accordance with whether a receiving frequency is higher or lower than a local oscillating frequency. |
