  The paper considers the calibration of control-bounded analog-to-digital
converters. It is demonstrated that variations of the analog frontend can be
addressed by calibrating the digital estimation filter. In simulations (both
behavioral and transistor level) of a leapfrog analog frontend, the proposed
calibration method restores essentially the nominal performance. Moreover, with
digital-filter calibration in mind, the paper reformulates the design problem
of control-bounded converters and thereby clarifies the role of sampling,
desired filter shape, and nominal conversion error.
