皮皮学，免费搜题
登录
logo - 刷刷题
搜题
【简答题】
用规定器材设计一个满足以下性能要求的用于某移动通信设备的锁相频率合成器，试画出框图。 性能要求： (1)工作频率范围880.4～924.4MHz。 (2)信道间隔100kHz。 (3)频率稳定度1×10 -5 。 规定器材清单： (1)VCO，频率调偕范围200～240MHz。 (2)鉴频/鉴相器，最高工作频率1MHz。 (3)吞脉冲频率合成器芯片MC145152。 (4)10MHz、12.8MHz、52MHz晶振，频率稳定度均为1×10 -6 。 (5)÷40/41双模分频器。 (6)可编程分频器，最高工作频率35MHz。 (7)组成各种带通、低通滤波器使用的电感、电容、电阻及。 (8)1GHz内的混频器。 (9)各种分频器、倍频器。
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
微信内点击右上角“…”即可分享
反馈
参考答案：
举一反三
【判断题】空气阻力在汽车低速时，对汽车动力性影响较大；汽车高速行驶时，对汽车动力性影响较小。
A.
正确
B.
错误
查看完整题目与答案
【简答题】显示卡的核心部件是()
查看完整题目与答案
【简答题】There is no ______ (rely) information about the child who was found missing almost a month ago.
查看完整题目与答案
【单选题】母乳中可对抗肠道病原体感染的物质主要是
A.
SIgA
B.
IgG
C.
IgM
D.
乳铁蛋白
E.
双歧因子
查看完整题目与答案
【单选题】A child ______ parents are dead is called an orphan.
A.
who
B.
who’s
C.
whose
D.
which
查看完整题目与答案
【单选题】Are the parents who let their child who is ______ walk in the dark alone at night considerate?
A.
young enough
B.
too young to
C.
not old enough to
D.
so young
查看完整题目与答案
【单选题】The person who is least likely to be a child-abusing parent is the one who____.
A.
was raised in abusive family situations himself
B.
creates a peaceful and supportive family environment for his children
C.
is unemployed or socially isolated
D.
is mentally ill
查看完整题目与答案
【单选题】I feel it is your husband who _______ for the spoiled child.
A.
is to blame
B.
is to excuse
C.
is to accuse
查看完整题目与答案
【简答题】显卡的核心部件是( ),将数字信号转换成模拟信号的部件是( ),用于暂时存放显示 芯片处理的数据的是( ).
查看完整题目与答案
【简答题】表达式17/2的结果是____________。表达式17%2的结果是____________。
查看完整题目与答案
相关题目：
【判断题】空气阻力在汽车低速时，对汽车动力性影响较大；汽车高速行驶时，对汽车动力性影响较小。
A.
正确
B.
错误
查看完整题目与答案
【简答题】显示卡的核心部件是()
查看完整题目与答案
【简答题】There is no ______ (rely) information about the child who was found missing almost a month ago.
查看完整题目与答案
【单选题】母乳中可对抗肠道病原体感染的物质主要是
A.
SIgA
B.
IgG
C.
IgM
D.
乳铁蛋白
E.
双歧因子
查看完整题目与答案
【单选题】A child ______ parents are dead is called an orphan.
A.
who
B.
who’s
C.
whose
D.
which
查看完整题目与答案
【单选题】Are the parents who let their child who is ______ walk in the dark alone at night considerate?
A.
young enough
B.
too young to
C.
not old enough to
D.
so young
查看完整题目与答案
【单选题】The person who is least likely to be a child-abusing parent is the one who____.
A.
was raised in abusive family situations himself
B.
creates a peaceful and supportive family environment for his children
C.
is unemployed or socially isolated
D.
is mentally ill
查看完整题目与答案
【单选题】I feel it is your husband who _______ for the spoiled child.
A.
is to blame
B.
is to excuse
C.
is to accuse
查看完整题目与答案
【简答题】显卡的核心部件是( ),将数字信号转换成模拟信号的部件是( ),用于暂时存放显示 芯片处理的数据的是( ).
查看完整题目与答案
【简答题】表达式17/2的结果是____________。表达式17%2的结果是____________。
查看完整题目与答案
参考解析：
知识点：
题目纠错 0
发布
创建自己的小题库 - 刷刷题