Operational amplifier employing complementary field-effect transistors

An operational amplifier circuit comprising:

• first and second input terminals and an output terminal;
• first and second supply terminals for receiving operating potential;
• first and second differential amplifying means of first and second complementary conductivity types, respectively, each having first and second input connections to which said first and second input terminals respectively connect, and each having first and second output connections;
• first and second current mirror amplifying means of said second and first conductivity types, respectively, each having an output connection to which said output terminal connects, each having a respective common connection to which said first and second supply terminals respectively connect, and each having a respective input connection to which the second and first output connections of said first differential amplifying means respectively connect;
• and
• third and fourth current mirror amplifying means of said first and second conductivity types, respectively, each having an output connection to which said output terminal connects, each having a respective common connection to which said second and first supply terminals respectively connect, and each having a respective input connection to which the second and first output connections of said second differential amplifying means respectively connect.