Amplifiers – With periodic switching input-output
Reexamination Certificate
2007-10-02
2007-10-02
Mottola, Steven J. (Department: 2817)
Amplifiers
With periodic switching input-output
C330S254000
Reexamination Certificate
active
11283915
ABSTRACT:
A switched-capacitor programmable gain amplifier (PGA) has improved circuit performance that avoids impracticably small capacitors, while providing low total harmonic distortion (THD) and reasonable gain linearity. The sampling capacitor (CS) in the PGA is designed with a C-2C capacitor array. Gain settings from the C-2C capacitor array arranged for selection with constant VGS switches. The gain of the resulting PGA corresponds to the ratio of the effective capacitance of the C-2C array and the effective capacitance value of the feedback capacitor (CF). The resulting performance of the PGA has reduced charge injection and clock feed-through errors, and thus reduced THD.
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Abo, Andrew M. et al., “A 1.5-V, 10-bit, 14.3-MS/s CMOS Pipeline Analog-to-Digital Converter,”IEEE Journal of Solid-State Circuits, 1999, (pp. 599-606).
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Hertzberg Brett A.
Merchant & Gould P,C,
Mottola Steven J.
National Semiconductor Corporation
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