Low distortion triangular wave generator circuit and low distortion triangular wave generation method

A low distortion triangular wave generator circuit, comprising:

• an integration circuit, which is configured to operably receive an external clock signal, wherein during a charging period and a discharging period within a switching period of the external clock signal, the integration circuit respectively performs integration on an integration capacitor by a charging current and a discharging current, so as to generate a triangular wave signal;
• wherein a time length of the charging period is identical to a time length of the discharging period;
• and
• an adjustment control circuit, which is configured to operably generate a common mode related signal according to the triangular wave signal, wherein the common mode related signal is related to a common mode characteristic of the triangular wave signal, and wherein the adjustment control circuit is configured to operably generate an adjusting signal with a gain according to a difference between the common mode related signal and a predetermined direct current (DC) level;
• wherein the adjusting signal is configured to operably adjust at least one of the charging current and the discharging current by feedback mechanism, such that the triangular wave signal is a symmetrical triangular wave and an average voltage of the triangular wave signal is equal to a target DC level.