Patent ID: 7417513

Claim:
A system for modulating a phase component of an electromagnetic signal, comprising: a phase/frequency detector having a first phase/frequency detector input, a second phase/frequency detector input, and a phase/frequency detector output, the first phase/frequency detector input being configured to receive a reference signal; an oscillator having an oscillator input and an oscillator output, where the oscillator is configured to generate a desired oscillator output signal at the oscillator output; a divider configured to receive the oscillator output signal, where the divider has a divider count input and a divider carryout output, and where the divider carryout output is connected to the second phase/frequency detector input; a loop filter connected in series between the phase/frequency detector output and the oscillator input, where the loop filter has a transfer function including a frequency corresponding to a substantially maximum magnitude of the transfer function, a first frequency response rate change point, and a second frequency response rate change point, the first frequency response rate change point being between the frequency corresponding to the substantially maximum magnitude of the transfer function and the second frequency response rate change point; where the first frequency response rate change point and the second frequency response rate change point each correspond to a pole or a zero in the transfer function, and where the first frequency response rate change point corresponds to an initial roll-off from the frequency corresponding to the substantially maximum magnitude of the transfer function, the initial roll-off having a first slope, and the second frequency response rate change point corresponds to a secondary roll-off, the secondary roll-off having a second slope steeper than the first slope; and a pre-emphasis filter in communication with the divider and configured to compensate for the initial roll-off in the transfer function of the loop filter, the pre-emphasis filter having a substantially maximum gain of about at most 40 dB.