Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Logarithmic
Patent
1993-02-10
1995-05-09
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Logarithmic
G06G 724
Patent
active
054143136
ABSTRACT:
A dual-mode successive detection amplifier for providing a first output signal corresponding to a logarithmic function of a RF input signal, and for providing a second limited RF output signal is disclosed herein. A RF input signal is applied to the first of a succession of amplification stages arranged along a RF signal path to cascade amplify the RF input signal into the limited RF output signal. A plurality of detector/limiter (D/L) circuits interposed between the amplification stages limit RF signal energy propagating along the RF signal path so as to prevent saturation of the amplification stages. The D/L modules also provide a succession of detection signals corresponding to video envelopes of the RF signal energy produced by each of the amplification stages. The detection signals are applied to a video summation line and therein summed to produce the logarithmic output signal.
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"Wide-band Limiting Amplifiers With Low Second Harmonic Distortion, Utilizing GaAs MMIC Limiters"; E. J. Crescenzi Jr. et al.; 1985 IEEE MTT-S Digest; 0149-645X/85/0000-0328; pp. 328-331.
Bamford Jonathan K.
Crescenzi, Jr. Emil J.
O'Mahoney Michael A.
Wandinger Titus J.
Dudek James A.
Sikes William L.
Watkins Johnson Company
Zimmer Kevin J.
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