Abstract: The disclosure relates to phase shifting in Delay Locked Loops (DLLs) and Phase-Locked Loops (PLLs). A charge pump in the DLL or PLL includes a capacitor connected in parallel to an output node. A primary current switching circuit charges the capacitor with a source current and discharges the capacitor with a sink current. A supplemental source circuit sources a positive phase shift producing current which has a range of magnitudes. A magnitude of the positive phase shift producing current is determined by at least one source selection signal. A supplemental sink circuit for sources a negative phase shift producing current which has a range of magnitudes. A magnitude of the negative phase shift producing current is determined by at least one sink selection signal.

Abstract: The disclosure relates to phase detectors. Charge up and charge down signals that are generated by a phase detector cause i) following detection of a first edge of a reference clock signal, switching on of a switching transistor of sink current; ii) following detection of an edge of a feedback clock signal falling within less than 180 degrees from the first edge, switching on of a switching transistor of source current and switching off of the switching transistor of sink current; and iii) following detection of an edge of another reference signal at a point in time about midway between the first edge and a next similar edge of the reference clock signal has past, switching off of the switching transistor of source current while maintaining the switching transistor of sink current switched off.

Abstract: The disclosure relates to phase detectors. Charge up and charge down signals that are generated by a phase detector cause i) following detection of a first edge of a reference clock signal, switching on of a switching transistor of sink current; ii) following detection of an edge of a feedback clock signal falling within less than 180 degrees from the first edge, switching on of a switching transistor of source current and switching off of the switching transistor of sink current; and iii) following detection of an edge of another reference signal at a point in time about midway between the first edge and a next similar edge of the reference clock signal has past, switching off of the switching transistor of source current while maintaining the switching transistor of sink current switched off.

Abstract: The disclosure relates to phase shifting in Delay Locked Loops (DLLs) and Phase-Locked Loops (PLLs). A charge pump in the DLL or PLL includes a capacitor connected in parallel to an output node. A primary current switching circuit charges the capacitor with a source current and discharges the capacitor with a sink current. A supplemental source circuit sources a positive phase shift producing current which has a range of magnitudes. A magnitude of the positive phase shift producing current is determined by at least one source selection signal. A supplemental sink circuit for sources a negative phase shift producing current which has a range of magnitudes. A magnitude of the negative phase shift producing current is determined by at least one sink selection signal.

Abstract: The disclosure relates to phase detectors. Charge up and charge down signals that are generated by a phase detector cause i) following detection of a first edge of a reference clock signal, switching on of a switching transistor of sink current; ii) following detection of an edge of a feedback clock signal falling within less than 180 degrees from the first edge, switching on of a switching transistor of source current and switching off of the switching transistor of sink current; and iii) following detection of an edge of another reference signal at a point in time about midway between the first edge and a next similar edge of the reference clock signal has past, switching off of the switching transistor of source current while maintaining the switching transistor of sink current switched off.

Abstract: A circuit for clamping current in a charge pump is disclosed. The charge pump includes switching circuitry having a number of switching circuitry transistors. Each of first and second pairs of transistors in the circuit can provide an additional path for current from its associated one of the switching circuitry transistors during off-switching of that transistor so that a spike in current from the switching circuitry transistor is only partially transmitted through a path extending between the switching circuitry transistor and a capacitor of the charge pump.