Current transition rate control circuit

Details Current transition rate control circuit Current transition rate control circuit

1994-04-13

1996-07-09

Westin, Edward P.

Electronic digital logic circuitry

Signal sensitivity or transmission integrity

Output switching noise reduction

326 58, 326121, H03K 1716

Patent

active

055347908

ABSTRACT:
A current transition rate control circuit is provided, comprising first and second data inputs; first and second charge/discharge circuits for receiving the first and second data inputs; a first reference voltage circuit for sending a first control signal and a second reference voltage circuit for sending a second control signal to, respectively, the first and second charge/discharge circuits; and first and second output transistors coupled, respectively, to the outputs of the first and second charge/discharge circuits. The circuit controls the switching speed of the output transistors to minimize current spikes on the output. The circuit may include a pre-driver circuit for (i) receiving a single data input and outputting the first and second data inputs, and (ii) receiving a circuit disabling signal and placing the circuit in a high impedance state which turns off both of the output transistors. A test circuit is also provided for deactivating the first and second data inputs and for shutting off current flow in the first and second reference voltage circuits so that leakage current in the circuit may be measured.

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