Voltage amplifying source follower circuit

Details Voltage amplifying source follower circuit Voltage amplifying source follower circuit

1991-12-03

1995-03-21

Hellner, Mark

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330277, H03F 316

Patent

active

053999894

ABSTRACT:
A voltage amplifying source follower circuit provides an output gain characteristic greater than unity with low overall noise. The circuit typically comprises a source follower FET with additional FETs to sense the output voltage and change the load current in a direction opposite to a change in the input voltage. In response to an input voltage change, the load current is varied by the source follower circuit so that the corresponding output voltage change is amplified beyond that of the input voltage change. By varying the load current in a direction opposite to the effect of a load resistance, the source follower gain is increased to greater than unity. When the input voltage increases, the output voltage increases even more because the load current is decreased correspondingly. The compact amplifying circuit can be fabricated on an integrated circuit chip outside critical unit cell areas of a focal plane array.

REFERENCES:
patent: 5045808 (1991-09-01), Taylor
patent: 5083095 (1992-01-01), Madaffari
patent: 5155449 (1992-10-01), Ito

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