Current steering output circuit with switchable shunt resistor

Details Current steering output circuit with switchable shunt resistor Current steering output circuit with switchable shunt resistor

1997-09-29

1999-10-12

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Utilizing three or more electrode solid-state device

327108, 327310, 327374, 327389, 326 17, 326 27, 326 83, 307 52, H03K 1716, H03K 1704

Patent

active

059660422

ABSTRACT:
A current output circuit comprises a current driver that is switchably connected across two output nodes by a switching assembly and having a switchable shunt resistor connected across the current driver. The switchable shunt resistor may be switched between a non-conducting state and a resistive conducting state. In a first data state, the current driver is connected to the output nodes by the switching assembly and the switchable shunt resistor is non-conducting so that the supplied current will flow through a load attached to the output nodes. In a second data state, the current driver is disconnected from the output nodes and the switchable shunt resistor is in a resistive conducting state. In this state the current bypasses the load and is diverted through the switchable shunt resistor. Several current drivers with appropriate switching arrangements and one or more switchable shunt resistors may be provided to allow for asymmetric current outputs in various data states.

REFERENCES:
patent: 4308466 (1981-12-01), Cushman et al.
patent: 4742535 (1988-05-01), Hino et al.
patent: 4979089 (1990-12-01), Takase et al.
patent: 5333081 (1994-07-01), Mitsui
patent: 5808884 (1998-09-01), Teggatz et al.

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