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US 2003/0141924 A1Published application
Circuit for canceling thermal hysteresis in a current switch
AssigneeRaytheon Company
InventorAlbert E. Cosand
Life of this patent
Estimating the term…
Abstract
A current switch circuit including a current switch including a first transistor and a second transistor connected as a differential pair and receiving a differential logic signal at their bases, and logic signal controlling circuitry coupled to the first and second transistors for offsetting a transition starting point of the differential logic signal to offset a self-heating induced shift in a switching threshold of the current switch.
Claims17
A current switch circuit comprising:
- a current switch comprising a first transistor and a second transistor connected as a differential pair, said first transistor having a base terminal, said second transistor having a base terminal, said current switch receiving a differential logic signal at said base terminals;
- and
- logic signal controlling circuitry for replicating a thermal history of said first transistor and said second transistor to generate an offset voltage substantially equal to a shift in a switching threshold voltage of said current switch that is induced by self heating of said first and second transistors, said offset voltage adjusting said differential logic signal so as to substantially null said shift.
A current switch circuit comprising:
- a current switch comprising a first transistor and a second transistor connected as a differential pair, said first transistor having a base terminal, said second transistor having a base terminal, said current switch receiving a differential logic signal at said base terminals;
- and
- logic signal controlling circuitry coupled to said first and second transistors for offsetting a transition starting point of said differential logic signal to offset a self-heating induced shift in a switching threshold of said current switch.
A current switch circuit comprising:
- a current switch comprising a first transistor and a second transistor connected as a differential pair, said first transistor having a base terminal, said second transistor having a base terminal, said current switch receiving a differential logic signal at said base terminals;
- and
- a differential data latch providing a differential logic signal to said base terminals;
- said differential data latch including an output circuit comprised of a third transistor having an emitter terminal, a first load resistor connected between the emitter terminal of said third transistor and the base terminal of said first transistor, a fourth transistor having an emitter terminal, and a second load resistor connected between the emitter terminal of said fourth transistor and the base terminal of said second transistor;
- and
- said third and fourth transistors being configured to substantially replicate a thermal history of said first and second transistors so as to generate a voltage between said emitter terminal of said third transistor and said emitter terminal of said fourth transistor that is substantially equal to a shift in a threshold voltage of said current switch.
3 more elements
Dependencies are inferred from the claim text.