Phase aligning phase locked loop (PLL) circuit

A signal phase aligning circuit, the circuit comprising:

• a signal generator circuit configured to generate a signal;
• a phase locked loop circuit configured to generate a phase locked loop signal based on the signal generated by the signal generator circuit, wherein the phase locked loop circuit comprises a phase detector, a loop filter, and a voltage controlled oscillator, wherein the voltage controlled oscillator is configured to generate the phase locked loop signal at a frequency proportional to a voltage of a filtered signal generated by the phase detector and filtered by the loop filter, wherein the phase detector is configured to generate a phase detector signal as a difference in phase between the phase locked loop signal and the signal generated by the signal generator circuit, wherein the loop filter is configured to generate the filtered signal based on the phase detector signal by filtering the phase detector signal;
• and
• a phase aligning circuit configured to receive a control input and align a phase locked loop signal phase of the phase locked loop signal with a signal phase of the signal generated by the signal generator circuit based on the control input, wherein the control input is the filtered signal, wherein the phase aligning circuit is a phase shifter, wherein the phase aligning circuit is configured to generate a shifted signal as a phase aligning circuit output based on the phase locked loop signal output by the voltage controlled oscillator, wherein a voltage controlled oscillator output of the voltage controlled oscillator and a loop filter output of the loop filter are both inputs to the phase aligning circuit.

An integrated circuit, the integrated circuit comprising:

• a first phase locked loop circuit configured to generate a first phase locked loop signal based on a signal generated by a signal generator, wherein the first phase locked loop circuit comprises:
• a phase detector circuit configured to generate a voltage signal wherein a value of the voltage signal is based on a relative difference in phase between the first phase locked loop signal and the signal generated by the signal generator;
• a loop filter configured to receive the voltage signal of the phase detector circuit as an input and generate a filtered signal as a loop filter output based on the voltage signal;
• and
• a voltage controlled oscillator, wherein the voltage controlled oscillator is configured to generate the first phase locked loop signal at a frequency proportional to a voltage of the filtered signal, the first phase locked loop signal generated as a voltage controlled oscillator output of the voltage controlled oscillator;
• a first phase aligning circuit configured to align a first phase locked loop signal phase of the first phase locked loop signal with a signal phase of the signal generated by the signal generator, wherein the first phase aligning circuit receives a control input, wherein the first phase aligning circuit receives the filtered signal as the control input, wherein the first phase aligning circuit is configured to shift the first phase locked loop signal phase of the first phase locked loop signal based on the control input, wherein the first phase aligning circuit comprises a phase shifter, wherein the phase shifter is configured to generate a shifted signal as a phase shifter output based on the phase locked loop signal output by the voltage controlled oscillator, wherein the voltage controlled oscillator output of the voltage controlled oscillator and the loop filter output of the loop filter are both inputs to the phase shifter;
• a second phase locked loop circuit configured to generate a second phase locked loop signal based on the signal generated by the signal generator;
• and
• a second phase aligning circuit configured to align a second phase locked loop signal phase of the second phase locked loop signal with the signal phase of the signal of the signal generator;
• wherein the first phase locked loop signal phase of the first phase locked loop signal is aligned with the second phase locked loop signal phase of the second phase locked loop signal.