Invention Grant
US08761696B2 Highly linear and very low-noise down-conversion mixer for extracting weak signals in the presence of very strong unwanted signals 有权
高线性和非常低噪声的下变频混频器,用于在存在非常强的无用信号的情况下提取弱信号

Highly linear and very low-noise down-conversion mixer for extracting weak signals in the presence of very strong unwanted signals
Abstract:
A method and system for wireless communication is provided and may include mitigating blocker signals in transmitted RF signals in a wireless device including a transmitter front end. The mitigation may include up-converting a baseband signal, mixing the up-converted baseband signal with a feedback signal, and amplifying the mixed up-converted baseband signal and the feedback signal to generate an output signal. The feedback signal may be generated by down-converting the output signal, low-pass filtering the down-converted output signal, and up-converting the filtered down-converted signal for the summing. The blocker signals may correspond to receive frequencies for the wireless device and may be converted to DC via the down-converting. The wireless devices may operate in accordance with at least a CDMA standard. The mixed up-converted baseband signal and the feedback signal may be amplified utilizing a source follower amplifier, where the gain and/or linearity may be configured by varying coupling capacitors.
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