Patent ID: 6163216
Filing Date: 2000-12-19
Classification: H03F

Abstract:
A wideband operational amplifier for use in integrated circuits, said operational amplifier comprising:an input stage comprising:a first input buffer having an input terminal and an output terminal;a second input buffer having an input terminal and an output terminal;a resistor network connected between said output terminal of said first input buffer and said output terminal of said second input buffer;a first pair of current mirrors, each current mirror of said first pair of current mirrors having an input terminal connected to at least one terminal of said first input buffer and having an output terminal connected to said output terminal of said second input buffer; and,a second pair of current mirrors, each current mirror of said second pair of current mirrors having an input terminal connected to at least one terminal of said second input buffer; andan output stage comprising an output buffer, said output buffer having an input terminal connected to said second input buffer; and an output terminal for providing a high output current and a high output voltage; andwherein said first pair of current mirrors is configured to facilitate the correction of voltage offset occurring at said output terminal of said output buffer.wherein said input terminal of said output buffer is connected to an output terminal of said each current mirror of said second pair of current mirrors.