Now I' m designing a amplifying circuit for a 100MHz sine signal, and the floor noise of amplifying circuit should be ultralow. The following information is phase noise requirment of the amplifying circuit :10Hz：-115dBc/Hz，100Hz：-140dBc/Hz，1kHz：-165dBc/Hz，10kHz：-178dBc/Hz. Can you help and recommend some amplifers which satisfy the phase noise requirment? I also hope you can provide the recommanding application circuit for the recommand amplifers.
Hi Jie Zhang,
I am looking into this. I'll get back to you soon.
I looking forward your answer.
Sorry if I missed this thread. Phase noise is usually associate with RF amplifier. I move your questions on the RF and Microwave community. Someone here should be able to assist you on your query.
We will need more information on your application.
What is the:
What is your target output power on the output of the amplifier?
If I read your specification it is more about VCO specification. Usually the specification for the VCO is dBc/Hz, also the roll-off factor is ~40dB between 2 decades 100Hz...10kHz which corresponds more to VCO theory.
The spectral mask of amplifiers is determined by noise figure at far offsets and flicker noise at near offset. Thus noise figure defines of the amplifier the noise floor in principle. From my experience best phase noise performance has got Si components (BJT).
Also additional question: Input / output impedance is critical for your application?