Patent ID: 6563342
Filing Date: 2003-05-13
Classification: H03K

Abstract:
A CMOS ECL output buffer having a buffer input and a buffer output, wherein the buffer output is arranged to provide an output signal to an ECL circuit in response to an input signal on the buffer input, the CMOS ECL output buffer comprising:a CMOS differential feedback amplifier having a reference input, a feedback input, and an output, wherein the reference input is held at a high-state reference voltage suitable for use as a high state voltage by the ECL circuit; a CMOS output circuit coupled between the output of the CMOS differential feedback amplifier and the buffer output; and, a negative feedback circuit coupled between the buffer output and the feedback input of the CMOS differential feedback amplifier; wherein the output signal has a high state and a low state, and wherein the high-state is at about the high-state reference voltage.