Design of low noise programmable gain wide-band DC amplifier
Ke Tang · Modern Electronics Technique · 2012
The design philosophy and flow of low noise programmable gain wide-band DC amplifier are presented.The fabricated low noise amplifier was cascaded with low noise integrated programmable gain op-amp AD603 and high-frequency transistor 2N2219 and 2N2905 and other devices.The input voltage is less than 10 mV,the output signal is 10 V,pass band is 0～8 MHz,the maximum gain is 53 dB,and the gain in 0～50 dB,5 dB step can be controlled by the microcontroller.In addition,fluctuation in gain and bandwidth is less than 1dB of the two level wide-band low-noise DC amplifier.