Design of a novel wideband op amp with CCII structure

作者：Jia, Hua-yu^*; Lv, Yuxiang

来源：Analog Integrated Circuits and Signal Processing, 2015, 85(3): 445-449.

DOI：10.1007/s10470-015-0611-2

• Operation amplifier
• Pipelined ADC
• Current-mode
• Common-mode feedback

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.

• 出版日期2015-12
• 单位太原理工大学