Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Logarithmic
Reexamination Certificate
2007-03-27
2007-03-27
Wells, Kenneth B. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Logarithmic
C327S351000
Reexamination Certificate
active
11058085
ABSTRACT:
A logarithmic amplifier is compensated by a feedback loop. The feedback loop may control a series of detector cells in response to an output from one or more of the detector cells. The feedback loop may be used to provide frequency compensation to the log amp by adjusting the bias currents to the detector cells. One detector cell may be arranged to generate a limiting signal while another detector cell is arranged to generate a zero signal. By arranging the feedback loop to adjust the bias cell so as to maintain the difference between the limit signal and the zero signal at a constant value, the output swing of the detector cells is held constant, thereby stabilizing the slope of the log amp.
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Analog Devices Inc.
Marger Johnson & McCollom PC
Wells Kenneth B.
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