Monolithic amplifier with high-value, monolithically formed passive feedback resistor

摘要

A monolithic amplifier that has a high-value passive feedback resistor. The passive feedback resistor is formed from arsenic implanted polysilicon, that has a sheet resistivity on the order of 1 GOmega per square, and is connected to form a resistor of at least 1 GOmega, more preferably 7.5 GOmega or more. The resistor is connected as the feedback resistor of a cascode amplifier and a capacitor is formed in parallel with the feedback resistor. A low noise amplifier can therefore be formed that is DC coupled and uses a completely passive resistance feedback element.