| 摘要 |
A frequency converter comprises a first differential circuit formed with first and second transistors M1, M2 and optionally a second differential circuit formed with third and fourth transistors M3, M4. The first and second differential circuits are driven by equal values of constant current. An input alternating current signal is supplied between the gates of the first and second transistors with an offset voltage difference. Also, an input alternating current signal is supplied between the gates of the third and fourth transistors with an offset voltage difference. Then, the differential outputs of the first and second differential circuits are connected in cross-connection to selectively extract frequency component double of the frequency of the input alternating current signal. The offset voltage may be provided by DC bias, a pair of transistors or a transistor resistor combination. <IMAGE>
|
