Patent ID: 11942937
Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 13:
14. A method of calibrating bias signals provided to operational reciprocal quantum logic (RQL) circuitry in an RQL integrated circuit (IC), the method comprising:
inputting a sample signal to RQL AC bias sampler wrapper circuitry comprising a plurality of RQL AC bias samplers, more than one of the plurality of AC bias samplers comprising:
a pulse generator driven by an AC bias signal derived from one or more AC clock resonators, the pulse generator having at least one of:
a weakened AC clock resonator bias tap to the one or more AC clock resonators of the RQL IC as compared to an AC clock resonator bias tap of a JTL in the operational RQL circuitry, or
a Josephson junction (JJ) having a larger critical current than a JJ in the operational RQL circuitry; and

an RQL gate having a first input coupled to an output of the pulse generator and a second input coupled to a sample signal input line comprising a JTL;

observing an output of the AC bias sampler wrapper circuitry;
varying an amplitude of an AC clock signal provided to the operational RQL circuitry via the AC clock resonator; and
determining that the varying the amplitude of the AC clock signal has moved the amplitude of the AC clock signal closer to an optimal bias point of the operational RQL circuitry.