Re: [請益] RF MIXER

看板comm_and_RF作者 (PTTuser)時間14年前 (2009/09/09 23:43), 編輯推噓6(6推 0噓 37→)
留言43則, 5人參與, 最新討論串1/3 (看更多)
※ 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 -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 123.195.2.141
推
09/10 00:31, , 1F
嗯嗯...謝謝你! 不過被動的MIXER也可以做
09/10 00:31, 1F
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09/10 00:31, , 2F
在TSMC 0.18um裡嗎??
09/10 00:31, 2F
推
09/10 05:43, , 3F
可以
09/10 05:43, 3F
推
09/10 10:53, , 4F
of course for .18 process
09/10 10:53, 4F
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09/10 10:54, , 5F
your MOSFETs just simply act as switch
09/10 10:54, 5F
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09/10 10:56, , 6F
but not sure with passive for low power
09/10 10:56, 6F
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09/10 10:57, , 7F
usually passive mixer need larger LO
09/10 10:57, 7F
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09/10 10:58, , 8F
larger LO driver can kill you in power
09/10 10:58, 8F
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09/10 10:59, , 9F
also linearity could be a concern
09/10 10:59, 9F
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09/10 11:00, , 10F
if really want to do passive in 0.18um
09/10 11:00, 10F
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09/10 11:01, , 11F
ask DNW option from your Boss
09/10 11:01, 11F
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09/10 11:03, , 12F
however, i am not expert of mixer
09/10 11:03, 12F
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09/10 11:03, , 13F
all above is only my suspicion
09/10 11:03, 13F
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09/10 17:45, , 14F
可以的 基本上也是用rfmos只是沒有流電流
09/10 17:45, 14F
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09/10 17:46, , 15F
但是你要設計好gate電壓 令LO swing可以對mos
09/10 17:46, 15F
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09/10 17:46, , 16F
造成switch的效果 device size也要選一下
09/10 17:46, 16F
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09/10 17:47, , 17F
會影響妳LO在你輸入的頻旅看到的阻抗
09/10 17:47, 17F
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09/10 17:49, , 18F
好像說錯了 不是gate電壓 是S/D電壓
09/10 17:49, 18F
推
09/11 00:27, , 19F
嗯~ 謝謝各位^^
09/11 00:27, 19F
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09/11 00:31, , 20F
再問一下喔~ IF 中頻 要去哪裡查?
09/11 00:31, 20F
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09/11 00:31, , 21F
我的意思是 如果我做2.4GHz的MIXER 那IF?
09/11 00:31, 21F
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09/11 00:32, , 22F
這要到哪裡才查的到??? 謝謝了!!
09/11 00:32, 22F
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09/11 00:38, , 23F
也許你應該先說妳到底要做什麼樣的系統?
09/11 00:38, 23F
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09/11 00:39, , 24F
不同調變方式需要不同的頻寬 這可能需要做
09/11 00:39, 24F
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09/11 00:40, , 25F
system或baseband的人來訂到底if的center
09/11 00:40, 25F
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09/11 00:41, , 26F
freq. 和band width是多少 然後決定DAC到
09/11 00:41, 26F
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09/11 00:41, , 27F
mixer間的LPF design
09/11 00:41, 27F
推
09/11 01:12, , 28F
不同的架構有不同的IF 同時也牽扯到Image
09/11 01:12, 28F
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09/11 01:12, , 29F
rejection的問題 還有filter的設計
09/11 01:12, 29F
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09/11 17:29, , 30F
image rejection感覺跟poly-phase filter
09/11 17:29, 30F
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09/11 17:30, , 31F
以及LO的I-Q error比較有關係ㄟ...
09/11 17:30, 31F
推
09/11 23:44, , 32F
Lary, you are talking about zero-IF sys
09/11 23:44, 32F
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09/12 11:53, , 33F
I am talking about low IF system
09/12 11:53, 33F
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09/12 12:02, , 34F
I'm not sure if the mixer design is differ
09/12 12:02, 34F
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09/12 12:02, , 35F
ent for zero-IF and low-IF. However, the
09/12 12:02, 35F
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09/12 12:03, , 36F
difficult part of zero-IF design would be
09/12 12:03, 36F
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09/12 12:04, , 37F
how to remove DC offset due to device mism
09/12 12:04, 37F
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09/12 12:04, , 38F
atch or other factors without affecting th
09/12 12:04, 38F
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09/12 12:05, , 39F
e wanted signal. A HPF with very low 3dB
09/12 12:05, 39F
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09/12 12:06, , 40F
freq will need a large layout area and lon
09/12 12:06, 40F
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09/12 12:07, , 41F
g stable time. I did not do it myself.
09/12 12:07, 41F
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09/12 12:09, , 42F
I do not know it very well and we can
09/12 12:09, 42F
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09/12 12:09, , 43F
discuss if you are interested.
09/12 12:09, 43F
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Re: [請益] RF MIXER Re: RF MIXER
Lary
14年前, 09/09
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