Voltage follower circuit

Details Voltage follower circuit Voltage follower circuit

2005-03-01

2005-03-01

Mis, David (Department: 2817)

Demodulators

Amplitude modulation demodulator

C329S311000, C329S353000, C327S073000, C327S562000, C375S320000, C375S340000, C375S346000

Reexamination Certificate

active

06861901

ABSTRACT:
A voltage follower comprising a first field-effect transistor (MN1) whose gate forms the input of the voltage follower. Further provided is a second field-effect transistor (MN2) whose drain connected to the gate forms the output of the voltage follower. The sources of the two field-effect transistors (MN1, MN2) are connected to each other and to the drain of a third field-effect transistor (MN3) serving as current source and to the gate of which a predefined bias voltage is applied. The invention employs in addition a fourth field-effect transistor (MN4) whose source-drain path is circuited between the output of the voltage follower and the drain of the third field-effect transistor (MN3) and whose gate is connected to the gate of the third field-effect transistor (MN3). As compared to prior art voltage followers the voltage follower in accordance with the invention comprises a wider voltage range in which it can be put to use. This can be made use of e.g. in amplitude shift-keyed (ASK) demodulators incorporating the voltage follower in accordance with the invention and which need to be operated with particularly small supply voltages.

REFERENCES:
patent: 4714845 (1987-12-01), Devecchi et al.
patent: 5847606 (1998-12-01), Shacter
patent: 6005439 (1999-12-01), Fong

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