Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1995-05-15
1997-01-21
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327345, 327558, 327563, 330253, 330260, H03K 522, H03F 345
Patent
active
055962890
ABSTRACT:
A differential-difference current conveyor combines features of a differential-difference amplifier and a current conveyor. The differential-difference current conveyor receives four input signals (1, 2, 3, X) and outputs one output signal Z. There is a defined relationship of voltages and currents, wherein V.sub.X =V.sub.1 -V.sub.2 +V.sub.3 ; I.sub.1 =I.sub.2 =I.sub.3 =0; and I.sub.X =I.sub.Z. The differential-difference current conveyor has a first differential pair, in which a non-inverting input terminal and an inverting input terminal are coupled to the third and second input signals, respectively; a second differential pair, in which a non-inverting input terminal and an inverting input terminal are coupled to the first and fourth input signals, respectively, and a non-inverting output terminal and an inverting output terminal of the second differential pair are connected to an inverting output terminal and a non-inverting output terminal of the first differential pair, respectively; a load connected between a high voltage source and a joint terminal of the output terminals of the first and second differential pairs; a negative feedback circuit, connected to the non-inverting output terminal of the second differential pair and the non-inverting input terminal of the second differential pair; and a tracking circuit for tracking a current value from the fourth input signal to the output signal, which is connected between the high voltage source and the low voltage source.
REFERENCES:
patent: 4228366 (1980-10-01), Huttemann et al.
patent: 4338527 (1982-07-01), Nagano
patent: 4929908 (1990-05-01), Imanishi
patent: 5130666 (1992-07-01), Nicollini
patent: 5196742 (1993-03-01), McDonald
patent: 5394026 (1995-02-01), Yu et al.
Callahan Timothy P.
Englund Terry L.
National Science Council
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