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When I use the Cadence spectre to run the "hb" simulation for 1dB-compression point of a receiver front-end, an error is encounted.
The simulation--output log gives the error information as follows:
Fatal error found by spectre at time=201.784ns during periodic steady state analysis, during...
when i use a resistive feedback ota as a TIA, i find that the feedback resistor leads to startup problem.
the ota is a 2nd-order opamp with miller compensation.
how to solve the startup problem?
thank you vphone
i determin to abort the single-balanced structre, because i have not find any single-balanced mixer applied in direct-conversion receiver.maybe it's too adventurous， especially when the correnlated offset is time-varient。
thank you again for your advice
thank you ,vfone!
the reason i choose the single-balanced structre because the LNA is single-ended output, and the noise figure of single-input double-balanced exceeds the tolorance of the LNA gain. that's to say , the NF charactoristic is the derect reason i choose the single-balanced structre...
the single-balanced mixer is applied in a 2.4GHz zero-IF receiver for low NF design with supply current of 2mA. Are there some serious disadvantages with the single-balanced mixer, except for the RF-IF leakage?
what about the dc-offset caused by the IM2 in the single-balanced structrue?
i design a differential input balanced Gilbert down-conversion mixer.The current bleeding technique is adopted in the mixer.
The simulated SSB NF@1MHz=21.5dB and the input 1dB compression point=13.7dB, when the supply cirrent equals 1.8mA.
Is the NF specification a little bad?
how can i...
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