Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Logarithmic
Reexamination Certificate
2006-02-21
2006-02-21
Callahan, Timothy P. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Logarithmic
C327S351000, C327S352000
Reexamination Certificate
active
07002395
ABSTRACT:
A demodulating logarithmic amplifier rectifies a radio frequency signal prior to amplification through progressive stages. A full wave linear or squaring rectifier receives a waveform signal at the input and provides a rectified signal that is proportional to an envelope or a square of the envelope of the waveform signal at the output. The rectified signal is then fed to a series of limiting amplifier stages where the signal is progressively amplified. After each individual amplifier stage, the partially amplified signal is passed through a voltage-to-current converter to create a current signal. All the current signals are subsequently summed to produce an amplified current output signal that is representative of the logarithm of the envelope of the input signal.
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Callahan Timothy P.
Larson & Associates P.C.
Lavaque Michelle
Nguyen Hai L.
Yuantonix, Inc.
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