| 摘要 |
<p>A frequency converter includes a multiplying circuit (1), a load circuit (2), and an output buffer circuit (3). The multiplying circuit (1) is arranged to multiply an RF signal and an LO signal and output a difference frequency signal with a frequency, which is the difference between the frequencies of the two signals, from its output terminal. The load circuit (2) is arranged to connect the output terminal of the multiplying circuit (1) to a power supply (Vcc). The output buffer circuit (3) is arranged to have an input terminal connected to the output terminal of the multiplying circuit (1), and an output terminal for outputting a signal to the next stage. A notch circuit (4) for removing an undesired signal frequency component is combined in the load circuit (2). The notch circuit (4) has an impedance characteristic in which the impedance is abruptly reduced to provide a valley point at the undesired signal frequency. <IMAGE></p> |
