Amplifiers – With periodic switching input-output
Reexamination Certificate
2005-09-06
2005-09-06
Choe, Henry (Department: 2817)
Amplifiers
With periodic switching input-output
C330S069000
Reexamination Certificate
active
06940342
ABSTRACT:
A programmable gain amplifier using metal-oxide-semiconductor (MOS) devices to approximate exponential gain characteristic with linear control signals is disclosed. According to one embodiment, the programmable gain amplifier (300a-300b) may include a capacitive switching circuit (304a-304b), a capacitive switching circuit (306a-306b), and an operational amplifier (302a-302b). Capacitive switching circuits (304a-304band306a-306b) may receive an analog input voltage through sample switches (308a-308band310a-310b). Capacitive switching circuit (304a-304b) receives an output from operational amplifier (302a-302b) through feedback switch (312a-312b). The programmable gain amplifier (300a-300b) may include a few additional unit capacitors which can allow larger gain ranges or more steps for a given range without a large increase in chip size.
REFERENCES:
patent: 5479130 (1995-12-01), McCartney
patent: 5739720 (1998-04-01), Lee
Bilhan Haydar
Han Yong
Lee Gary
Ramesh M. C.
Tsay Ching-Yuh
Brady III Wade James
Choe Henry
Mosby April M.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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