(a) The articles of incorporation or a bylaw adopted by the shareholders may provide for a greater quorum or voting requirement for shareholders (or voting groups of shareholders) than is provided for by this Chapter. Any such bylaw adopted by the shareholders after the effective date of this section must be approved by a quorum and vote sufficient to amend the articles of incorporation for that purpose.
(b) Any provision in the articles of incorporation or bylaws prescribing the quorum or vote required for any purpose as permitted by this section may not itself be amended by a quorum or vote less than the quorum or vote therein prescribed.