Frequency generation in a quantum controller
View Patent ↗A system comprises time-tracking circuitry and phase parameter generation circuitry. The time-tracking circuitry is operable to generate a time-tracking value corresponding to time elapsed since a reference time. The phase parameter generation circuitry operable to: receive the time-tracking value; receive a control signal that conveys a frequency parameter corresponding to a desired frequency of an oscillating signal; and generate a plurality of phase parameters used for generation of an oscillating signal, wherein the generation of the plurality of phase parameters is based on the time-tracking value and the frequency parameter such that the oscillating signal maintains phase continuity across changes in the frequency parameter.
1. A system comprising:
an oscillator operable to generate an oscillating signal according to a plurality of phase parameters, wherein:
the plurality of phase parameters are generated according to a time-tracking value and a frequency;
the time-tracking value corresponds to time elapsed since a reference time; and
the oscillating signal maintains phase continuity across changes in the frequency.
2. The system of claim 1 , wherein the oscillator comprises a register operable to store the time-tracking value and increment the time-tracking value on each cycle of a clock.
3. The system of claim 1 , wherein the oscillator comprises a hardware gate array.
4. The system of claim 1 , wherein the oscillator comprises a coordinate rotation circuit.
5. The system of claim 1 , wherein the oscillator is operable to alter the plurality of phase parameters over time to change the frequency.
6. The system of claim 1 , wherein the plurality of phase parameters is generated according to a frequency offset signal.
7. The system of claim 6 , wherein the oscillator is operable to adjust the frequency offset signal according to a feedback signal.
8. The system of claim 1 , wherein the oscillator is operable to generate the frequency.
9. The system of claim 8 , wherein the oscillator is operable to alter the frequency according to a feedback signal.
10. The system of claim 1 , wherein each of the plurality of phase parameters has a phase offset relative to others of the phase parameters.
11. A system comprising:
a function generator circuit operable to generate a plurality of phase parameters according to a time-tracking value and a frequency, wherein:
the time-tracking value corresponds to time elapsed since a reference time; and
the plurality of phase parameters maintain phase continuity across changes in the frequency.
12. The system of claim 11 , wherein the function generator circuit comprises a register operable to store the time-tracking value and increment the time-tracking value on each cycle of a clock.
13. The system of claim 11 , wherein the function generator circuit is operable to generate an oscillating signal according to the phase parameter.
14. The system of claim 11 , wherein the function generator circuit comprises a coordinate rotation circuit.
15. The system of claim 11 , wherein the function generator circuit is operable to alter the phase parameter over time to change the frequency.
16. The system of claim 11 , wherein the plurality of phase parameters is generated according to a frequency offset signal.
17. The system of claim 16 , wherein the function generator circuit is operable to adjust the frequency offset signal according to a feedback signal.
18. The system of claim 11 , wherein the function generator circuit is operable to generate the frequency.
19. The system of claim 18 , wherein the function generator circuit is operable to alter the frequency according to a feedback signal.
20. The system of claim 11 , wherein the function generator circuit is operable to change the frequency from a first value to a second value and then back to the first value.