Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Logarithmic
Patent
1993-08-05
1996-10-01
Nelms, David C.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Logarithmic
327351, 327352, 327563, G06F 7556, G06G 712
Patent
active
055613926
ABSTRACT:
A logarithmic amplification circuit is provided which is composed of a differential amplifier, a plurality of full-wave rectifiers including two half-wave rectifiers connected so as to have their input signals inverse in phase to each other and respectively receiving an output signal of the differential amplifier, and an adder for adding the output signals of the full-wave rectifier. Each of the half-wave rectifiers includes a differential transistor pair only one of which has an emitter resistor. Two sets of such differential transistor pair are arranged so that the collectors of transistors with emitter resistors are connected, the collectors of transistors without emitter resistors are connected, an output signal of the differential amplifier is applied to the base of one of the transistors having an emitter resistor and one of the transistors not having an emitter resistor, another output signal of the differential amplifier is applied to the base of the other of the transistors having an emitter resistor and the other of the transistors not having an emitter resistor, and the transistors of each pair are connected, respectively, to constant current sources.
REFERENCES:
patent: 4794342 (1988-12-01), Kimura
patent: 4972512 (1990-11-01), Garskamp
patent: 4990803 (1991-02-01), Gilbert
patent: 5049829 (1991-09-01), Garskamp
patent: 5057717 (1991-10-01), Kimura
patent: 5070303 (1991-12-01), Dent
patent: 5298811 (1994-03-01), Gilbert
patent: 5319264 (1994-06-01), Kimura
patent: 5319267 (1994-06-01), Kimura
Analog Dialogue, vol. 23, No. 3, 1989, by Barrie Gilbert, Bob Clarke, A. Paul Brokaw and Jeff Barrow "Monolithic DC-to-120-MHz Log-Amp is Stable and Accurate", pp. 1-9.
NEC Corporation
Nelms David C.
Phan Trong
LandOfFree
Logarithmic amplifier employing cascaded full-wave rectifiers in does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Logarithmic amplifier employing cascaded full-wave rectifiers in, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Logarithmic amplifier employing cascaded full-wave rectifiers in will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1504519