英语翻译A wideband amplifier is described which utilizes twodiff
英语翻译
A wideband amplifier is described which utilizes two
different channels for the amplification of the high- and
low-frequency components of the input signal.Due to
the unique feedback configuration,the low-frequency
channel contributes only where the gain of the highfrequency
channel decreases.Therefore,there is no need
for frequency splitting at the input.
Commercially available operational amplifiers,utilizing
either current or voltage feedback,are limited at
moderate gains of for instance ten-fold to an upper
frequency in the range of 100–300 MHz; which results in
transition times of from one to several nanoseconds.
They also have the drawback of possessing high input
currents.If wider frequency ranges and low input
currents are required,the described method for the
construction of a wideband dc-coupled amplifier becomes
appropriate,especially in as much as today
integrated microwave amplifiers with an upper frequency
of several gigahertz are available at low prices
as do transistors with transition frequencies in the
gigahertz range.