Continuous-time delta-sigma analog-to-digital converter and operation method thereof

An operation method of a continuous-time delta-sigma analog-to-digital converter, the operation method comprising:

• by a linear integrator, generating a first output signal corresponding to a preset input voltage based on an operation of a linear Gm circuit that receives the preset input voltage;
• by a quantizer, generating a second output signal corresponding to the first output signal based on an operation of a body-driven VCO that receives the first output signal;
• and
• by the quantizer, generating a digital output code corresponding to the second output signal based on an operation of a Frequency to Digital Converter (FDC) that receives the second output signal,
• wherein the operation method of the continuous-time delta-sigma analog-to-digital converter operates based on an input impedance determined by chopping frequency (fCH) at a node connected to an input terminal of the linear integrator and an input capacitor (CIN) provided between the input terminal of the linear integrator and a ground line.