The inherently low input impedance of the transistor makes it necessary for special techniques to be used to raise this low impedance to values in the range of 1 to 30 megohms. This paper reviews a few of the techniques that allow high input impedance amplifiers to be realized. The main design criteria for these amplifiers are (1) high input impedance, (2) thermal stability, and (3) low noise figure. The various circuits that are presented will be discussed with respect to criteria (1) and (2) above. General comments will be made on the factors influencing noise figure.
(See document for exact affiliation information.)
https://aes2.org/publications/elibrary-page/?id=442
(441KB)
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member Join the AES. If you need to check your member status, login to the Member Portal.
