Low noise AC coupled amplifier with low band-pass corner and...

Details Low noise AC coupled amplifier with low band-pass corner and... Low noise AC coupled amplifier with low band-pass corner and...

2007-08-21

2007-08-21

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S300000, C330S261000

Reexamination Certificate

active

11069030

ABSTRACT:
A low noise AC coupled amplifier having transistors sharing bias currents, and having a low band-pass corner frequency and consuming low power. The amplifier may be used in a magneto-resistive (MR) preamplifier to amplify a response from a MR sensor. Bipolar and MOS transistors are used in the front end, utilizing the advantages of each transistor type to achieve low noise as well as low band-pass corner. The amplifier has a modified structure achieving lower power by using a PNP transistor instead of an NPN transistor.

REFERENCES:
patent: 5382916 (1995-01-01), King et al.
patent: 6057972 (2000-05-01), Castellucci
patent: 6150876 (2000-11-01), Ngo
patent: 6831799 (2004-12-01), Pakriswamy et al.
patent: 6967525 (2005-11-01), Price, Jr.
patent: 7082004 (2006-07-01), Kajiyama et al.

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