Patent ID: 7283003

Claim:
A reset signal generator for a frequency-phase detector, the reset signal generator comprising: a first signal source circuit coupled to a pump-up signal of the frequency-phase detector, the first signal source circuit including a first load therein establishing a voltage level at a first node when a first current flows through the first load, the first signal source circuit being configured to activate the first current responsive to the pump-up signal; a second signal source circuit coupled to a pump-down signal of the frequency-phase detector, the second signal source circuit including a second load therein establishing a voltage level at a second node when a second current flows through the second load, the second signal source circuit being configured to activate the second current responsive to the pump-down signal; and a logic circuit configured to generate the reset signal responsive to the voltage levels at the first node and at the second node; wherein the first signal source circuit includes a first current source and wherein the second signal source signal includes a second current source and wherein the first and second current sources are configured to vary the first current and the second current substantially inversely proportional to variations in a resistance of the first and second load so that the first and second voltage levels have a substantially unchanged level within a range of variance of the resistances of the first and second load.