哪位老兄帮我翻译一下英文资料,谢谢了!

来源:百度知道 编辑:UC知道 时间:2024/06/09 03:38:58
1.RF/1st Conversion Stage (Front-End)

The MAX2741 RF front-end LNA and mixer are the most important in the signal path. This stage sets the noise figure for the receiver, defining the sensitivity, and mixes the 1575.42MHz L1-band GPS signal down to a 1st IF of 37.38MHz. The LNA itself has an NF of approximately 1.5dB; the cascaded NF of the front-end (including the mixer) is approximately 4.7dB, and the cascaded gainis typically 21dB.The image-reject mixer is set up for a high-side injected RFLO (1612.80MHz), and offers typically better than 30dB rejection of the image noise (1650.18MHz). The -30dBm input 3rd-order intercept (IIP3) of the RF strip, in conjunction with the GPS IF filter, provides excellent out-of-band interferer immunity.The 1st IF outputs (IFOUT±) are internally biased to approximately 2V, and have a differential source impedance of approximately 2.5kΩ. The IF filter can be
implemented as a discrete L/C filter, or as a monolithic SAW or ceramic if one i

1.rf/1st转换阶段(前完)
该max2741射频前端芯片低噪声放大器和混频器是最重要的,在信号路径。这一阶段设置隔音数字接收机,确定灵敏度,并混在1575.42mhz的L1波段GPS信号下降至一个如一日的37.38mhz 。该低噪声放大器自身具有的NF大约1.5分贝;级联的NF的前端(包括密炼机)约为4.7分贝,级联gainis通常21db.the镜像抑制混频器是成立了高规格的方注入rflo ( 1612.80mhz ) ,并提供一般优于30分贝排斥反应的图像噪声( 1650.18mhz ) 。 -为30 dBm输入三阶截取( iip3 )的射频带,要结合全球定位系统,如果过滤器,提供了优良的内外干扰immunity.the第一,如果产出( ifout ± ) ,是国内偏颇约2V的,并有一个微分源阻抗约2.5k ω 。如果该过滤器可
实施作为一个离散升/炭过滤器,或作为一个单片SAW或陶瓷如果一个人可用。
2.if/2nd转换阶段

第2次转换阶段包括一个活跃的混频器,可变增益放大器( VGA )和一个可调谐低通滤波器。该混频器,如果配置低边LO注入了,如果第二次的3.78mhz 。总增益,在此阶段是62分贝, VGA的优惠51分贝的增益调整。 VGA的,是典型的控制下,由基带IC通过SPI接口,以优化信号摆动,为数字化,由香港艺术发展局。该单晶片低通滤波器有一个可调截止频率,可编程从2.9mhz至7.7mhz在16个步骤。这LPF的进一步降低内外的噪音和带限信号,以艺发局,以确保取样的过程中不产生化名components.dc抵消补偿,在ADC输入,是由一个片4位DAC 。这弥补了任何直流误差推出晶体管错配问题,在微分阶段驱动ADC输入,让downconverted GPS卫星信号的直流电平将围绕内部门槛voltagesof艺展局。

2.if/2nd转换阶段

第2次转换阶段包括一个活跃的混频器,可变增益放大器( VGA )和一个可调谐低通滤波器。该混频器,如果配置低边LO注入了,如果第二次的3.78mhz 。总增益,在此阶段是62分贝, VGA的优惠51分贝的增益调整。 VGA的,是典型的控制下,由基带IC通过SPI接口,以优化信号摆动,为数字化,由香港