Overshoot control and damping circuit for high speed drivers
AssigneeNational Semiconductor Corporation
InventorPeyman Hojabri
Life of this patent
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Abstract
An overshoot and damping control circuit for high speed L-R-C drivers. By properly configuring four transistors in conjunction with a high speed driver, negative feedback can be utilized to generate a spike of current to correct for overshoot which results when driving an inductive load with high speed signals. This same configuration also provides the additional benefit of providing a signal which dampens the ringing which results from driving an inductive load with a high speed signal.
Claims17
An apparatus for reducing current overshoot, comprising:
- a first circuit coupled to a first node, wherein the first node is configured to couple to a first end of a load;
- wherein the first circuit includes a first voltage controlled current source circuit which senses a voltage at the first end of the load and in response to a transient voltage at the first node provides a first current to be injected into the first node.
A method for reducing current overshoot through a load connected between a first node and a second node, comprising the steps of:
- transmitting a first current through the load from the first node to the second node to compensate for a first current overshoot having a first polarity;
- and
- transmitting a second current through the load from the second node to the first node to compensate for a second current overshoot having a second polarity which is opposite to the first polarity.
Dependencies are inferred from the claim text.