We have developed very wide-band monolithic amplifiers, using an advanced silicon bipolar process called SST-2 which made it possible to lower base resistance and parasitic capacitance. Analog ICs, such as AGC and post amplifiers, for repeater circuits of a high speed optical fiber transmission system were fabricated, and the following excellent characteristics were obtained. (1) The gain and 3 dB down bandwidth of the post amplifier are 15 dB and 1.4 GHz, respectively. (2) The maximum gain, 3 dB down bandwidth and dynamic range of the AGC amplifier are 28 dB, 630 MHz and 30 dB, respectively.