| 摘要 |
There is a need for an inexpensive, high-performance, fully-integrable, multistandard transceiver, which suppresses spurious noise signals. The invention provides a topology that satisfies this need, providing a first mixer for receiving an input signal x(t), and mixing it with a multi-tonal mixing signal phi1 to generate an output signal phi1 x(t), and providing a second mixer for receiving the phi1 x(t) signal, and mixing it with a mono-tonal mixing signal phi2, to generate an output signal phi1 phi2 x(t). The two mixing signals emulate an LO signal because phi1 * phi2 has significant power at the frequency of the LO signal being emulated. The topology also includes a power measurement circuit for measuring the power of the output signal phi1 phi2 x(t). This power output signal is used to vary the characteristics of the mono-tonal mixing signal phi2 to reduce the power level of said output signal. |
