| 摘要 |
PURPOSE: To obtain an arbitrary desired voltage-time gradient by controlling the rise and fall times of the output signal from a VLSI chip output circuit. CONSTITUTION: An on-chip logic circuit 12 generates an input signal VIN to an intermediate buffer 14, which couples this input signal VIN with a couple of time-dependent voltage generators 16 and 18. The outputs VP (t) and VN (t) of the voltage generators 16 and 18 are coupled with the gate inputs of a P-channel transistor 20 and an N-channel transistor 22. The voltage generator 16 has the rise time of its output signal VO controlled and the voltage generator 18 has the fall time of its output signal VO controlled, so independent control over output currents IOP and ION is secured. |
