Current control circuit with current proportional circuit
AssigneeHitachi, Ltd.
InventorKunio Imai
Life of this patent
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Abstract
A current control circuit comprises a current proportional circuit having two terminals, the current of one terminal being a proportional relationship with the current of the other terminal. An output terminal coupled with the current proportional circuit and a load through which a controlled current flows, and a constant current source. A steering circuit to which a switching signal is applied, is provided between the two terminals of the current proportional circuit and the constant current source, in order to couple the constant current source to one of the two terminals in response to the switching signal.
Claims7
A current control circuit comprising:
- first means, having first and second terminals, for controlling currents such that the current flowing into the first terminal is in a proportional relationship with the current flowing into the second terminal;
- second means, connected between the first terminal of said first means and a common potential terminal, from which an output signal is delivered;
- third means for supplying a constant current to each of said first and second terminals;
- and
- fourth means connected between said first and third means for selectively steering the constant current from said third means to one of said first and second terminals of said first means in response to a first digital input information signal applied to said fourth means.
Dependencies are inferred from the claim text.