Patents by Inventor M. C. Ramesh

M. C. Ramesh has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for exponential gain variations with a linearly varying input code
    Patent number: 6940342
    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-304b and 306a-306b) may receive an analog input voltage through sample switches (308a-308b and 310a-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.
    Type: Grant
    Filed: April 7, 2003
    Date of Patent: September 6, 2005
    Assignee: Texas Instruments Incorporated
    Inventors: M. C. Ramesh, Feng Ying, Haydar Bilhan, Gary Lee, Yong Han, Ching-Yuh Tsay
  • Method and apparatus for exponential gain variations with a linearly varying input code
    Publication number: 20030201824
    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-304b and 306a-306b) may receive an analog input voltage through sample switches (308a-308b and 310a-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.
    Type: Application
    Filed: April 7, 2003
    Publication date: October 30, 2003
    Inventors: M.C. Ramesh, Feng Ying, Haydar Bilhan, Gary Lee, Yong Han, Ching-Yuh Tsay
  • Method and apparatus for exponential gain variations with a linearly varying input code
    Patent number: 6628164
    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-304b and 306a-306b) may receive an analog input voltage through sample switches (308a-308b and 310a-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.
    Type: Grant
    Filed: April 16, 2002
    Date of Patent: September 30, 2003
    Assignee: Texas Instruments Incorporated
    Inventors: M. C. Ramesh, Feng Ying, Haydar Bilhan, Gary Lee, Yong Han, Ching-Yuh Tsay
  • Method and apparatus for exponential gain variations with a linearly varying input code
    Publication number: 20020190788
    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-304b and 306a-306b) may receive an analog input voltage through sample switches (308a-308b and 310a-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.
    Type: Application
    Filed: April 16, 2002
    Publication date: December 19, 2002
    Inventors: M. C. Ramesh, Feng Ying, Haydar Bilhan, Gary Lee, Yong Han, Ching-Yuh Tsay