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(有些不知道怎么翻译,我看得不是很懂)
it is a folded cascode topology.
identical to ths4012, except that ths4012 used gigahertz transistors laser matched to the nth degree, and costing just $1 for two on a chip.
折叠式恒流源科技,和运放THS4012的设计完全相同,但4012 使用激光匹配N次方的高精度MHZ级的晶体管,而集合成本不到1美元的两颗到同一块芯片片上
the folded cascode is a topology widely used in high speed voltage feedback opamps. it is a VAS using current transmission but outputs a voltage signal.
折叠式恒流源是一种广泛用于高速电压反馈运放的技术,是一个使用电流传输但输出电压信号的电路
in this particular case, the front end is a standard differential pair, followed by a folded cascode VAS - notice the two pnp transistors on top driving into a folded wilson current mirror? the output stage is a typical class B complimentary ops - ths4012 used a diamond buffer.
特定情况下,前端是一个标准的差分管,然后是折叠式恒流源电路 - 注意:顶部的两个PNP管驱动折叠式威尔逊电流镜,输出级是一个 B类运放,得到大家称赞的ths4012也是钻石缓冲输出的。
this will be a very fast amp, thus the designer used a few capacitors to slow it down.
这将是很快的放大器,因此设计者要用少量电容让它慢下来
some key performance stats for ths4012:
THS4012的一些关键数据统计:
290mhz bandwidth, 310v/us slew rate, -80db ths+n (at 1mhz!), 110ma output current (into a 20ohm load - it will drive your headphone to ear bleeding levels). |
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