Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1993-12-14
1996-11-26
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
327334, G06F 744, G06G 716
Patent
active
055789595
ABSTRACT:
In an integrated circuit an effective admittance is adjusted. The adjustment uses an admittance element in combination with a current multiplier circuit. The current multiplier circuit provides current I.sub.p proportional to a reference current I.sub.ref through the admittance element: I.sub.p =.alpha.I.sub.ref. The current I.sub.p flows through a terminal in parallel with the current I.sub.ref through the admittance element. This reduces the effective admittance to ground seen at the terminal. The proportionality coefficient .alpha. is modulated using a control circuit which sets the coefficient .alpha. in a non-linear dependence (a+bM)/(c+dM), or P(M)/Q(M), where P and Q are polynomials, on a control signal M. In this way various electronic parameters which depend non-linearly on the effective admittance can be given a linear dependence on the control signal.
REFERENCES:
patent: 3571763 (1971-03-01), Haase
patent: 4025867 (1977-05-01), Seidel
patent: 4109214 (1978-08-01), Main
patent: 4602224 (1986-07-01), Arimoto et al.
patent: 4638265 (1987-01-01), Lunn et al.
De Haas Laurens J.
Van Der Wal Robbert H.
Gatham Laurie E.
Tran Toan
U.S. Philips Corporation
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