Control systems having an analog control unit that generates an analog value responsive to a digital value and having twice the resolution of the least significant bit of the digital value and methods of operating the same

摘要

A control system includes a digital control unit that is configured to generate a digital value responsive to a difference between an output analog value and a reference value. A control signal generating unit is configured to generate a control signal. An analog control unit includes a first circuit that is configured to generate a first analog value responsive to the digital value and a second circuit that is configured to generate a second analog value responsive to the control signal. The second circuit is configured to generate the second analog value at a resolution that is twice that of a resolution of the first circuit with respect to a least significant bit of the digital value. The analog control unit is configured to combine the first and second analog values to generate the output analog value.