| 主权项 |
1. A switching circuit for an active mixer; the switching circuit comprising a first pair of switching devices (M1a, M1b) and a second pair of switching devices (M2a, M2b), the first and second pairs of switching devices being arranged such that:
a first switching device (M1a) of the first pair of switching devices is operably coupled in series with a first switching device (M2a) of the second pair of switching devices between an input node of the switching circuit at which an input current comprising a first input frequency signal is received and a first of a pair of differential output nodes of the switching circuit; a second switching device (M1b) of the first pair of switching devices is operably coupled in series with a second switching device (M2b) of the second pair of switching devices between the input node of the switching circuit and a second of the pair of differential output nodes of the switching circuit, the first pair of switching devices (M1a, M1b) are controlled by a second input frequency signal, the second input frequency signal comprising a differential signal pair, and the first and second switching devices (M1a, M1b) of the first pair of switching devices are controlled by respective complementary signal components of the differential signal pair of the second input frequency signal; the second pair of switching devices (M2a, M2b) are controlled by a phase-shifted counterpart of the second input frequency signal, and the first and second switching devices (M2a, M2b) of the second pair of switching devices are controlled by respective complementary signal components of a differential signal pair of the phase shifted counterpart of the second input frequency signal; and a common node between the first switching devices (M1a, M2a) of the first and second pairs of switching devices is electrically coupled to a common node between the second switching devices (M1b, M2b) of the first and second pairs of switching devices. |
