Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2006-06-27
2006-06-27
Nguyen, Patricia (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S069000, C330S254000
Reexamination Certificate
active
07068108
ABSTRACT:
An amplifier apparatus having a gain programmable in discrete increments includes: (a) an operational amplifier having a first and second input and an output; (b) a feedback circuit between the output and the second input; (c) a reference signal source and supply circuit coupled with the first input; (d) a first resistor network coupled between a first signal locus and the first input conveying a first input signal to the first input and including a first plurality of parallel-connected first resistors; selected first resistors being independently coupled in a first connecting with the first input; (e) a second resistor network coupled between a second signal locus and the second input conveying a second input signal to the second input and including a second plurality of parallel-connected second resistors; selected second resistors being independently coupled in a second connecting with the second input.
REFERENCES:
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patent: 6127893 (2000-10-01), Llewellyn et al.
patent: 6545534 (2003-04-01), Mehr
J.J.F. Rijns, “CMOS Low-Distortion High-Frequency Variable-Gain Amplifier”, IEEE Journal of Solid State Circuits, vol. 31, pp. 1029-1034, Jul. 1996.
L. Moldovan and H.H. Li, “A Rail-to-Rail Constant Gain Buffered Op- Amp or Real Time Video Applications”, IEEE Journal of Solid-State Circuits, vol. 32, pp. 169-176, Feb. 1997.
Thonmas H. Lee, “The Design of CMOS Radio-Frequency Integrated Circuits”, pp. 184-187; Cambridge University, Press, 1998.
Bilhan Haydar
Xu Gonggui
Brady III W. James
Nguyen Patricia
Stewart Alan K.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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