Patent ID: 7692458

Claim:
A wide dynamic range charge pump comprising: a first, second, and third set of current sources, each set comprising: a top source connected to a first reference voltage and a top signal input, and an output to supply current responsive to a top signal; and, a bottom source connected to the top source output and a bottom signal input, and an output connected to a second reference voltage, different than the first reference voltage, to supply current in response to a bottom signal; a first capacitor having an input connected to the first set top source output, and an output connected to the second reference voltage; a first operational amplifier (op amp) having an input connected to the first set top source output, and an output connected to the second set top source output; a first resistor having a first end connected to the first op amp output and a second end connected to the third set top source output; a second capacitor having an input connected to the first resistor second end, and an output connected to the second reference voltage; wherein the first set receives a phase detector/phase-frequency detector (PHD/PFD) first output as the top signal and a PHD/PFD second output as the bottom signal input, to supply a first current (Iap) from the top source output in response to the difference between the top and bottom signal inputs; wherein the second set receives the PFD first output as the bottom signal and the PHD/PFD second output as the top signal input, to supply a second current (Ibp 2 ) from the top source output in response to the difference between the top and bottom signal inputs; and, wherein the third set receives the PHD/PFD first output as the top signal and the PHD/PFD second output as the bottom signal input, to supply a third current (Ibp 1 ) from the top source output in response to the difference between the top and bottom signal inputs.