I have a question about the power-supply voltage of OP27.
Can the OP27 be used in +5V single power supply?
Switching the Op-Amp from OP27 to ideal removes the frequency error.
This is basically the bias current of the op-amp. Lower bias currents give lower frequency error.
I have not been able to replicate what you have described below. Could I please clarify that the situation you are describing when pin 3 is grounded and pin 6 is 14V is the same as the schematic attached "OP27 schematic.jpg".
My customer are designing PLL circuit with HMC698LP5 (PLL), HMC391LP4(VCO) and OP27 (OPAMP).
And the ouput frequency are 3.9GHz or 4.05Ghz and the reference frequency is 50MHz.
Q1) when they implement a charge pump of HMC698, can they implement…
Can I use OP27 instead of OP07 in my new application.
I don't know of any spice models from any manufacturer that model temp co of Vos.
Looking at the OP27 model, it appears it does include noise modeling.
The OP27 should drive that, but I would increase both, say 2.2k and put 10nF-100nF across RF.
The title is OP37, but your schematic shows OP27. The pc board photo looks like an OP37.
You are onlly running a noise gain 3-4 so you really need an OP27. The OP37 should oscillate.
If your board is not oscillating with an OP37, you got…