摘要： Vector modulator 矢量调制器：调整信号的幅度和相位 http://www.21ic.com/app/test/201805/762401.htm 阅读全文

摘要： 1 Mixer characterization DC input Bias voltage Bias Current RF input Lo input IF output 2 mixer device Schottky diode: BJT or FET ：参考集成IC的datasheet 3 阅读全文

摘要： Function： change the frequency of the incident RF key parameters 阅读全文

摘要： at someone's disposal任某人处理,供某人使用to some extent在某种程度上at the latest至迟, 最迟have to必须, 不得不either or adj. 按位加的(二者择一的)hear from v. 接到...的信, 受...批评drop in on 阅读全文

摘要： Several cryptocurrency exchanges are plagued by poor market surveillance, pervasive conflicts of interest and lack sufficient customer protections, th 阅读全文