Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Reexamination Certificate
2005-02-03
2008-10-21
Tra, Quan (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
C327S337000
Reexamination Certificate
active
07439777
ABSTRACT:
A sampling circuit and method are disclosed. The sampling circuit includes a buffer, a holding capacitor, a set of switches, and at least two voltage references. The buffer drives buffered analog input signal via a first switch to a first node of holding capacitor. A second switch connects a second node of the holding capacitor to a first reference voltage. A third switch connects the second node of the holding capacitor to a second reference voltage. When the first and second switches are closed, charge accumulates on the holding capacitor. Opening the second switch terminates charging. The third switch biases the charged capacitor to the second reference voltage and the sampled output is taken from the first node of the holding capacitor. A rotary clock and control circuit provide the precise timing for the switches, especially the opening of the second switch, which determines the end of the sampling time.
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Haideh Khorramabadi, “EE247 Lecture 17: Digital Converters,” UCB, Department of Electrical Engineering and Computer Sciences, 2004, http://www˜inst.eecs.berkeley.edu/˜ee247/fa04/lectures/L17—f04.pdf#search=′EECS%20247%20Lecture%2017%3A%20Data%20Converters′.
Multigig Inc.
Tra Quan
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