| 前馈型轨到轨恒跨导恒增益CMOS运算放大器 |
| |
| 引用本文： | 张为,彭彦豪,齐步坤,姜宇.前馈型轨到轨恒跨导恒增益CMOS运算放大器[J].华中科技大学学报(自然科学版),2011(1):19-23. |
| |
| 作者姓名： | 张为 彭彦豪 齐步坤 姜宇 |
| |
| 作者单位： | 天津大学电子信息工程学院; |
| |
| 基金项目： | 天津市科技支撑计划重点资助项目(10ZCKFGX3600); 天津大学自主创新基金资助项目 |
| |
| 摘 要： | 设计了一种恒跨导恒增益的轨到轨运算放大器.输入级采用一倍电流镜控制的互补差分对结构,实现轨到轨和恒跨导.通过分析运算放大器电压增益随共模电压变化的原因,提出了一种前馈型恒增益控制模块,可以根据共模电压开启或关闭附加电流源,使运算放大器电压增益保持恒定.输出级采用前馈型AB类输出结构,以达到轨到轨输出效果.采用Chartered公司0.35μm工艺进行流片,仿真及测试结果表明:该运算放大器的直流开环增益为125dB,单位增益带宽为8.879MHz,在整个共模范围内电压增益最大变化率为1.69%.
|
| 关 键 词： | 运算放大器 前馈控制 恒增益 恒跨导 轨到轨 |
Feedforward rail to rail constant-gm constant gain CMOS operational amplifiers |
| |
| Zhang Wei Peng Yanhao Qi Bukun Jiang Yu.Feedforward rail to rail constant-gm constant gain CMOS operational amplifiers[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2011(1):19-23. |
| |
| Authors: | Zhang Wei Peng Yanhao Qi Bukun Jiang Yu |
| |
| Institution: | Zhang Wei Peng Yanhao Qi Bukun Jiang Yu(School of Electronic and Information Engineering,Tianjin University,Tianjin 300072,China) |
| |
| Abstract: | A rail-to-rail operational amplifier(OPA) with constant transconductance(gm) and constant gain was introduced.The input stage was a complementary differential pair controlled by the unity current mirror to realize rail-to-rail common-mode input and constant gm.Based on the relationship between the voltage gain and the common mode level,a novel feedforward constant gain control block was presented,turning on or off an additional current source to maintain the voltage gain unchanged.The feedforward class-AB s... |
| |
| Keywords: | operational amplifier forward control constant transconductance constant gain rail-to-rail |
| 本文献已被 CNKI 等数据库收录！ |
