Patent ID: 6075383
Filing Date: 2000-06-13
Classification: H03K

Abstract:
A GTL output amplifier for coupling an input signal present at an input of the amplifier into a transmission line present at an output of the amplifier, comprising:a pull-down transistor, which applies a first potential to the output for a first value of the input signal;a pull-up transistor circuit having a series circuit formed by a first transistor, which is switched off during occurrence of the first value of the input signal and is switched on during occurrence of a second value of the input signal;a second transistor having an input connected to a delay circuit and which remains switched on for a delay time which is governed by the delay circuit, during a transition phase of the input signal from the first value to the second value;the delay circuit operatively connected between the input and the second transistor, the delay circuit switching off the second transistor when the second value of the input signal occurs and after the delay time governed by the delay circuit has elapsed;a third transistor connected between a junction point of the first and second transistors of the series circuit, the third transistor being switched on during occurrence of the first value of the input signal;the pull-up transistor circuit being supplemented by a control circuit, which has a first control transistor, a second control transistor and a third control transistor and switches the second transistor off when the third control transistor of the control circuit is switched on as soon as a potential of the output exceeds a threshold voltage of the third control transistor.