专利汇可以提供Low noise receiver专利检索,专利查询,专利分析的服务。并且PURPOSE:To improve the noise figure and threshold value at a region having a low reception input, by turning off a switch circuit when a reception electric field is a prescribed value or over, and passing through a signal with a low reception level, without passing through a reception signal in a low noise amplifier. CONSTITUTION:A switch 3 is operated with information from a reception input electric field level monitoring circuit 7 at a region where a reception input level is high, and a signal from an input terminal 1 passes through a circulator 2 and is reflected at the switch 3. Since the signal is not amplified at a low noise amplifier 5 but amplified at a receiver 6 via the circulator 2, the receiver 6 is not saturated and not band-limited with a filter 4, the transmission characteristics are not deteriorated. At a region where the reception level is low, after the reception signal is amplified at an amplifier 5 through the circulator 2, the switch 3 and a BPF4, the signal is amplified at the receiver 6 through the BPF4, the switch 3 and the circulator 2 and the noise figure can remarkably be improved.,下面是Low noise receiver专利的具体信息内容。
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