Adjustable resistance device including first and second arrangem

Details Adjustable resistance device including first and second arrangem Adjustable resistance device including first and second arrangem

1995-02-24

1996-02-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327560, 330256, 330289, 330296, G06G 712

Patent

active

054932505

ABSTRACT:
An adjustable resistance device having a first parallel arrangement (1) of a first resistor and a first positive-feedback transconductor is provided with a control circuit (20) for controlling the controllable resistance section in the first parallel arrangement (1), which control circuit (20) includes a control loop including a second parallel arrangement (2) which is a copy of the first parallel arrangement (1). The control circuit (20) controls the controllable section of the second parallel arrangement (2) in such a manner that the negative resistance value formed by a second transconductor is substantially equal in magnitude to the resistance value of a second resistor, so that the second parallel arrangement (2) is bistable in the transition range. By selecting the positive resistance value in the first parallel arrangement (1) to be a factor smaller than the negative resistance value, which factor can be realized accurately in an integrated circuit, it is possible to obtain a higher effective resistance with a smaller spread.

REFERENCES:
patent: 4147989 (1979-04-01), Brolde
patent: 4456886 (1984-06-01), Nishioka et al.
patent: 4873492 (1989-10-01), Myer
patent: 5030925 (1991-07-01), Taylor
patent: 5220686 (1993-06-01), Kasperkovitz et al.
patent: 5394112 (1995-02-01), Alini et al.

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