Digital PLL Loop Filter

Hard MATLAB Control Asked at Marvell

Solve this problem

Design and simulate a second-order digital PLL loop filter, and verify that the loop locks to a frequency step within the expected settling time.

Constraints

Proportional-plus-integral loop filter.
Compute the coefficients from a target loop bandwidth and damping factor.
Simulate the phase error response to a frequency step.
Report the settling time to within 5 percent.
The loop must be stable for a damping factor of 0.707.
Fixed timestep simulation.

Starter codeMATLAB

1function result = pll_lock(bw_hz, zeta, fs, freq_step_hz)2% TODO3end