If error is related to the phase loop, it can be in the forward gain stage
or anything related to the feed-back loop. Oftentimes, this happens when
someone tries to feed power into the RF OUTPUT and damages it. The forward
gain-block is the next most common fault.
Re: Demodulating QPSK ... I have a general-purpose PLL implemented as a primitive in a language where I can easily run signals through it, plot the outputs, and tweak its parameters: initial frequency, loop gain, loop bandwidth and I/Q filter bandwidth. ... When I process File1 through the PLL and observe the control frequency being fed back to the VFO (this would be the locked frequency), I see a brief transient while the loop acquires lock. ... (comp.dsp)
Re: Do you think NI can fix my PLL? ... Since there is a lot of work to do, I have considered contracting out the PLL design to a well known control expert outside of my company, so I can focus on building other subsystems of the project. ... Wheel to be driven directly by a Maxon 200W brushless DC motor with an Advanced Motion Controls B15A8 PWM servo driver running in open loop mode.... (sci.electronics.design)
Re: Do you think NI can fix my PLL? ... difficulties stabilizing the loop.... I have considered contracting out the PLL design to a well known control... driven directly by a Maxon 200W brushless DC motor with an Advanced ... (sci.electronics.design)
Re: Do you think NI can fix my PLL? ... 90' phase shift within the PLL loop so the maths is not like an ordinary ...electronic PLL, the conversion of rpm to phase difference unavoidably shifts ... certain frequency determined by mass of the flywheel and the series ... Yes, I have modeled the motor as an electronic equivalent circuit, and set up loop compensation to provide>45 deg phase margin at unity, also -6dB/oct slope through unity. ... (sci.electronics.design)
Re: Do you think NI can fix my PLL? ... I'm attempting to build another motor PLL system and running into some ... I have considered contracting out the PLL design to a well known control ... Motion Controls B15A8 PWM servo driver running in open loop mode.... certain frequency determined by mass of the flywheel and the series ... (sci.electronics.design)
