Abstract
A wideband op amp for high speed pipelined analog to digital converter (ADC) is presented. The main amplifier adopts cascode structure and the auxiliary amplifier employs CCII structure. A current-mode feedback circuit is utilized to stabilize the out common mode voltage through adjusting the currents of the main amplifier. Test results show that the circuit has an open loop gain of 83.19 dB, a unity gain bandwidth of 1.6 GHz. Compared with traditional amplifier, the present op amp possesses lower power dissipation and higher response speed. A pipelined ADC for high-resolution video signal process using this op amp achieves a resolution of 10 bits and a sampling rate of 170 MS/s.
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