Hello everyone,
I found a charge pump topology as shown below.
    The control voltage of VCO is provided by the right-hand-side branch, instead of the left-hand-side. Have you seen this circuitry before? What is it called? I want to do some research on this.
    Furthermore, I think the capacitor C1 still affects the bandwidth of the PLL, even though it is not in the loop directly. Is that right?

Thanks,
Yutao Liu

Hello Raj,
Thanks for your quick reply.
The ckt in your reply is a classical current steering charge pump.
But why do you think my ckt is wrong?
In my opinion,  the current charging to/discharging from (right branch) the loop filter can represent the phase error all the same.

Thanks,
Yutao Liu

the circuit Raj shows is much more common and probably will work better.

Hello lex,
i guess it is not a patent, in 99% of products you see this circuit. I personally designed around 3 commercial circuits with the same charge pump some minor modification for matching.

Thanks,
raj,

Dear Yutao Liu ,
Problem is not on that side, in fact without bias it would have been better, but problem is other side(loop filter side)

Thanks,
Raj.

that's my definition of a patent that will never stand up in court.

the charge pump in the patent was in wide use 10 years or more prior to the patent.