US 11,854,643 B2
Signal processing system capable of performing voltage and frequency calibration
Cheng-Pin Chang, HsinChu (TW); and Tsung-Peng Chuang, HsinChu (TW)
Assigned to Realtek Semiconductor Corp., HsinChu (TW)
Filed by Realtek Semiconductor Corp., HsinChu (TW)
Filed on May 16, 2021, as Appl. No. 17/321,484.
Claims priority of application No. 109116684 (TW), filed on May 20, 2020.
Prior Publication US 2021/0365097 A1, Nov. 25, 2021
Int. Cl. G11C 29/50 (2006.01)
CPC G11C 29/50004 (2013.01) [G11C 2029/5004 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A signal processing system comprising:
a digital signal processing circuit;
a power management unit coupled to the digital signal processing circuit and configured to provide a first voltage to the digital signal processing circuit; and
a digital control circuit coupled to the digital signal processing circuit and the power management unit, and comprising a non-volatile memory, the digital control circuit being configured to, when in a calibration mode:
control the power management unit to set the first voltage at a minimum preset value;
control the digital signal processing circuit to operate under a first calibration target frequency;
trigger the digital signal processing circuit to perform a built-in self-test;
raise the first voltage when the built-in self-test fails;
trigger the digital signal processing circuit to perform the built-in self-test again; and
store the first calibration target frequency and a value of the first voltage corresponding to the first calibration target frequency to the non-volatile memory when the built-in self-test has succeeded.