AD9057
时间：04-11
整理：3721RD
点击：
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I got new problems in AD9057.
1. I use OSC to measure the bias voltage of AD9057.
I got 2.5~2.48 in two boards, and got 2.525 ~ 2.523 in another two boards.
Meanwhile, the sensitivity of 2.5~2.48 is -30dbm that is better than
2.525~2.523 that is -18dbm sensitivity.
Is it reasonable?
What kind reasons affect the bias voltage?
2. I calculate the mapping relationship between the bias voltage and sensitivity, I got an interesting phenomenon.
When the input signal Vp-p is 4mVp-p(4.98~5.02), the sensitivity is -44dbm, But, When the input signal is 12mVp-p(4.94~5.06), the sensitivity is -34dbm.
Please refer to
http://user52.starbeta.org/others/ad9057.xls
There is a big gap between the digital output is 7F and 7E.
May I have another type that amplification curve is exponential shape?
Does it useful in improving sensitivity?
I got new problems in AD9057.
1. I use OSC to measure the bias voltage of AD9057.
I got 2.5~2.48 in two boards, and got 2.525 ~ 2.523 in another two boards.
Meanwhile, the sensitivity of 2.5~2.48 is -30dbm that is better than
2.525~2.523 that is -18dbm sensitivity.
Is it reasonable?
What kind reasons affect the bias voltage?
2. I calculate the mapping relationship between the bias voltage and sensitivity, I got an interesting phenomenon.
When the input signal Vp-p is 4mVp-p(4.98~5.02), the sensitivity is -44dbm, But, When the input signal is 12mVp-p(4.94~5.06), the sensitivity is -34dbm.
Please refer to
http://user52.starbeta.org/others/ad9057.xls
There is a big gap between the digital output is 7F and 7E.
May I have another type that amplification curve is exponential shape?
Does it useful in improving sensitivity?