作者Lary (PTTuser)
看板comm_and_RF
標題Re: [請益] RF MIXER
時間Wed Sep 9 23:43:22 2009
※ 引述《poppyya (yeh)》之銘言：
: 請教一下各位~
: 因為小妹之前沒接觸過MIXER
: 現在想做一個MIXER跟LNA的電路整合
: 但無從下手 PAPER 裡有提到 LO IF...等等
: 想請教一下這些是啥??
: 還是說哪邊可以查到MIXER的原理
: 拜託高手了!!
我覺得如果你對RF完全外行
你可以看一下Razavi的書瞭解一下RF system的架構
detail的mixer電路如果是CMOS製程的話
我個人推薦Thomas Lee的書
至於你要做的mixer要看你是用在怎樣的system
若是protable的話可能要找passve mixer
若是不考慮耗電的話可以找active mixer
differential signal
不需要產生IQ的話可以用Giber cell
若是要產生IQ的話可能要用double balance的結構
single signal的話只要一顆device
detail可能就要自己看書囉
我也不是很熟
一點點自己的看法
--
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◆ From: 123.195.2.141
1F：推 poppyya:嗯嗯...謝謝你! 不過被動的MIXER也可以做 114.46.144.226 09/10 00:31
2F：→ poppyya:在TSMC 0.18um裡嗎?? 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只是沒有流電流 123.195.2.141 09/10 17:45
15F：→ Lary:但是你要設計好gate電壓 令LO swing可以對mos 123.195.2.141 09/10 17:46
16F：→ Lary:造成switch的效果 device size也要選一下 123.195.2.141 09/10 17:46
17F：→ Lary:會影響妳LO在你輸入的頻旅看到的阻抗 123.195.2.141 09/10 17:47
18F：→ Lary:好像說錯了 不是gate電壓 是S/D電壓 123.195.2.141 09/10 17:49
19F：推 poppyya:嗯~ 謝謝各位^^ 114.46.113.58 09/11 00:27
20F：→ poppyya:再問一下喔~ IF 中頻 要去哪裡查? 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:這要到哪裡才查的到??? 謝謝了!! 114.46.113.58 09/11 00:32
23F：→ Lary:也許你應該先說妳到底要做什麼樣的系統? 123.195.2.141 09/11 00:38
24F：→ Lary:不同調變方式需要不同的頻寬 這可能需要做 123.195.2.141 09/11 00:39
25F：→ Lary:system或baseband的人來訂到底if的center 123.195.2.141 09/11 00:40
26F：→ Lary:freq. 和band width是多少 然後決定DAC到 123.195.2.141 09/11 00:41
27F：→ Lary:mixer間的LPF design 123.195.2.141 09/11 00:41
28F：推 Gocoba:不同的架構有不同的IF 同時也牽扯到Image 72.222.132.58 09/11 01:12
29F：→ Gocoba:rejection的問題 還有filter的設計 72.222.132.58 09/11 01:12
30F：→ Lary:image rejection感覺跟poly-phase filter140.113.228.149 09/11 17:29
31F：→ Lary:以及LO的I-Q error比較有關係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