Multiplying digital-to-analog converter

A multiplying digital-to-analog converter (MDAC) having a first input terminal, a second input terminal, a first output terminal, and a second output terminal, the first input terminal and the second input terminal respectively receiving a first input signal and a second input signal, the first input signal being a common-mode voltage minus a signal component, the second input signal being the common-mode voltage plus the signal component, the MDAC comprising:

• an analog-to-digital converter (ADC) configured to generate a selection signal according to the first input signal and the second input signal;
• a selection circuit coupled to the ADC and configured to generate a first reference voltage and a second reference voltage according to the selection signal;
• an operational amplifier having an input port and an output port;
• a first switched capacitor (SC) circuit coupled to the first input terminal, the second input terminal, the input port, and the output port and configured to amplify the signal component;
• a second SC circuit coupled to the first input terminal, the second input terminal, the input port, and the output port and configured to amplify the signal component;
• a first switch coupled to the first output terminal and receiving the second reference voltage;
• a second switch coupled to the second output terminal and receiving the first reference voltage;
• a first load capacitor coupled to the output port and receiving the second reference voltage through the first switch;
• and
• a second load capacitor coupled to the output port and receiving the first reference voltage through the second switch.