作者Lary (PTTuser)
看板comm_and_RF
标题Re: [请益] RF MIXER
时间Wed Sep 9 23:43:22 2009
※ 引述《poppyya (yeh)》之铭言：
: 请教一下各位~
: 因为小妹之前没接触过MIXER
: 现在想做一个MIXER跟LNA的电路整合
: 但无从下手 PAPER 里有提到 LO IF...等等
: 想请教一下这些是啥??
: 还是说哪边可以查到MIXER的原理
: 拜托高手了!!
我觉得如果你对RF完全外行
你可以看一下Razavi的书了解一下RF system的架构
detail的mixer电路如果是CMOS制程的话
我个人推荐Thomas Lee的书
至於你要做的mixer要看你是用在怎样的system
若是protable的话可能要找passve mixer
若是不考虑耗电的话可以找active mixer
differential signal
不需要产生IQ的话可以用Giber cell
若是要产生IQ的话可能要用double balance的结构
single signal的话只要一颗device
detail可能就要自己看书罗
我也不是很熟
一点点自己的看法
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 123.195.2.141
1F：推 poppyya:嗯嗯...谢谢你! 不过被动的MIXER也可以做 114.46.144.226 09/10 00:31
2F：→ poppyya:在TSMC 0.18um里吗?? 114.46.144.226 09/10 00:31
3F：推 louisyan:可以 114.32.224.66 09/10 05:43
4F：推 carrack:of course for .18 process 72.130.190.120 09/10 10:53
5F：→ carrack:your MOSFETs just simply act as switch 72.130.190.120 09/10 10:54
6F：→ carrack:but not sure with passive for low power 72.130.190.120 09/10 10:56
7F：→ carrack:usually passive mixer need larger LO 72.130.190.120 09/10 10:57
8F：→ carrack:larger LO driver can kill you in power 72.130.190.120 09/10 10:58
9F：→ carrack:also linearity could be a concern 72.130.190.120 09/10 10:59
10F：→ carrack:if really want to do passive in 0.18um 72.130.190.120 09/10 11:00
11F：→ carrack:ask DNW option from your Boss 72.130.190.120 09/10 11:01
12F：→ carrack:however, i am not expert of mixer 72.130.190.120 09/10 11:03
13F：→ carrack:all above is only my suspicion 72.130.190.120 09/10 11:03
14F：→ Lary:可以的 基本上也是用rfmos只是没有流电流 123.195.2.141 09/10 17:45
15F：→ Lary:但是你要设计好gate电压 令LO swing可以对mos 123.195.2.141 09/10 17:46
16F：→ Lary:造成switch的效果 device size也要选一下 123.195.2.141 09/10 17:46
17F：→ Lary:会影响你LO在你输入的频旅看到的阻抗 123.195.2.141 09/10 17:47
18F：→ Lary:好像说错了 不是gate电压 是S/D电压 123.195.2.141 09/10 17:49
19F：推 poppyya:嗯~ 谢谢各位^^ 114.46.113.58 09/11 00:27
20F：→ poppyya:再问一下喔~ IF 中频 要去哪里查? 114.46.113.58 09/11 00:31
21F：→ poppyya:我的意思是 如果我做2.4GHz的MIXER 那IF? 114.46.113.58 09/11 00:31
22F：→ poppyya:这要到哪里才查的到??? 谢谢了!! 114.46.113.58 09/11 00:32
23F：→ Lary:也许你应该先说你到底要做什麽样的系统? 123.195.2.141 09/11 00:38
24F：→ Lary:不同调变方式需要不同的频宽 这可能需要做 123.195.2.141 09/11 00:39
25F：→ Lary:system或baseband的人来订到底if的center 123.195.2.141 09/11 00:40
26F：→ Lary:freq. 和band width是多少 然後决定DAC到 123.195.2.141 09/11 00:41
27F：→ Lary:mixer间的LPF design 123.195.2.141 09/11 00:41
28F：推 Gocoba:不同的架构有不同的IF 同时也牵扯到Image 72.222.132.58 09/11 01:12
29F：→ Gocoba:rejection的问题 还有filter的设计 72.222.132.58 09/11 01:12
30F：→ Lary:image rejection感觉跟poly-phase filter140.113.228.149 09/11 17:29
31F：→ Lary:以及LO的I-Q error比较有关系ㄟ...140.113.228.149 09/11 17:30
32F：推 carrack:Lary, you are talking about zero-IF sys 63.239.159.137 09/11 23:44
33F：→ Lary:I am talking about low IF system 60.250.197.166 09/12 11:53
34F：→ Lary:I'm not sure if the mixer design is differ 60.250.197.166 09/12 12:02
35F：→ Lary:ent for zero-IF and low-IF. However, the 60.250.197.166 09/12 12:02
36F：→ Lary:difficult part of zero-IF design would be 60.250.197.166 09/12 12:03
37F：→ Lary:how to remove DC offset due to device mism 60.250.197.166 09/12 12:04
38F：→ Lary:atch or other factors without affecting th 60.250.197.166 09/12 12:04
39F：→ Lary:e wanted signal. A HPF with very low 3dB 60.250.197.166 09/12 12:05
40F：→ Lary:freq will need a large layout area and lon 60.250.197.166 09/12 12:06
41F：→ Lary:g stable time. I did not do it myself. 60.250.197.166 09/12 12:07
42F：→ Lary:I do not know it very well and we can 60.250.197.166 09/12 12:09
43F：→ Lary:discuss if you are interested. 60.250.197.166 09/12 12:09