Low Noise Amplifier Gain Snr Diagram. It provides accurate pin selectable gains of 11 db to 31 db with a bandwidth of 90 mhz or 9 db to 51 db with a bandwidth of 9 mhz. The ad603 can drive a load impedance as low as 100 ω with.

The ad603 is a low noise voltage controlled amplifier for use in rf and if agc systems. Low noise amplifier are widely used in a variety of applications such as rf communication systems cellular telephone two way radio personal digital assistant pda bluetooth devices with other communication. According to the friis formula 6 if the preamplifier amplifier in the first stage has gain the noise from the following next amplifiers can be neglected and the preamplifier basically dominates the total noise factor of the whole receiving chain.

A schematic single stage amplifier is depicted in figure 3 13 the s parameter block represents an active device biased fet where some feedback may have been introduced to ease the trade off between otherwise contrasting goals noise gain input matching.

Any intermediate gain range may be arranged using one external resistor. A low noise amplifier lna is an electronic amplifier that amplifies a very low power signal without significantly degrading its signal to noise ratio an amplifier will increase the power of both the signal and the noise present at its input but the amplifier will also introduce some additional noise. Low noise amplifier are widely used in a variety of applications such as rf communication systems cellular telephone two way radio personal digital assistant pda bluetooth devices with other communication. The ad603 can drive a load impedance as low as 100 ω with.