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:
signal generation circuitry operable to generate an oscillating signal, wherein
the signal generation circuitry comprises time-tracking circuitry and phase generation circuitry, wherein:
the phase generation circuitry is operable to maintain phase continuity during a frequency change, and
a phase of the oscillating signal is determined according to time elapsed since a reference time, as determined by the time-tracking circuitry.
2. The system of claim 1 , wherein the signal generation circuitry comprises a register operable to store a time-tracking value, and wherein the time-tracking circuitry is operable to increment the time-tracking value on each cycle of a clock.
3. The system of claim 1 , wherein the signal generation circuitry comprises a hardware gate array.
4. The system of claim 1 , wherein the signal generation circuitry comprises a coordinate rotation circuit.
5. The system of claim 1 , wherein the signal generation circuitry is operable to alter a plurality of phase parameters over time to during the frequency change.
6. The system of claim 1 , wherein a plurality of phase parameters is generated according to a frequency offset signal.
7. The system of claim 6 , wherein the signal generation circuitry is operable to adjust the frequency offset signal according to a feedback signal.
8. The system of claim 1 , wherein the signal generation circuitry is operable to generate the desired frequency.
9. The system of claim 8 , wherein the signal generation circuitry is operable to alter the desired frequency according to a feedback signal.
10. The system of claim 1 , wherein each of a 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, via phase generation circuitry, a plurality of phase parameters according to time elapsed, as determined by time-tracking circuitry, since a reference time, wherein the plurality of phase parameters maintain phase continuity across changes in a desired frequency.
12. The system of claim 11 , wherein the function generator circuit comprises a register operable to store a time-tracking value, and wherein the time-tracking circuitry is operable to 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 plurality of phase parameters.
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 a phase parameter, of the plurality of phase parameters, over time during changes in a desired 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 desired frequency.
19. The system of claim 18 , wherein the function generator circuit is operable to alter the desired frequency according to a feedback signal.
20. The system of claim 11 , wherein the function generator circuit is operable to change the desired frequency from a first value to a second value and then back to the first value.