Precision switchable bus terminator circuit

Details Precision switchable bus terminator circuit Precision switchable bus terminator circuit

1990-04-30

1991-07-02

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307475, 357 59, H03H 1128

Patent

active

050292846

ABSTRACT:
An active integrated termination circuit for providing a predetermined impedance at an output includes first and second resistors each having one end of which is commonly connected to the output. A first switching element is coupled between the other end of the first resistor and a first power supply conductor and is responsive to control signals for selectively coupling and de-coupling the first resistor to the first power supply conductor. A second switching element is coupled between the other end of the second resistor and a second power supply conductor and is responsive to the control signals for selectively coupling and de-coupling the second resistor to the second power supply conductor. The first and second resistors are polycrystalline silicon resistors and are trimmed to predetermined values by pulsing a high current unilaterally therethrough.

REFERENCES:
patent: 4748426 (1988-05-01), Stewart
patent: 4783603 (1988-11-01), Goforth et al.
patent: 4792920 (1988-12-01), Ogawa
patent: 4818901 (1989-04-01), Young et al.
patent: 4859877 (1989-08-01), Cooperman et al.
patent: 4881902 (1989-11-01), Papa et al.
patent: 4882554 (1989-11-01), Akaba et al.

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