Load controlled ECL transient driver
First Claim
1. A circuit for driving a capacitive load, said circuit comprising:
- an output terminal coupled to the load;
logic means for providing first and second signals;
pull-up means coupled to said output terminal for selectively supplying a voltage thereto in response to said first signal;
pull-down means coupled to said output terminal for selectively sinking a current therefrom in response to a third signal;
comparator means responsive to a charge on the capacitive load and coupled to said output terminal for selectively providing a fourth signal having a time integral relative to said charge on the load; and
gate means coupled to said pull-down means, said logic means and said comparator means for providing said third signal in response to said second and fourth signals.
7 Assignments
0 Petitions
Accused Products
Abstract
An ECL transient driver discharges a capacitive load at the output of an emitter follower with a pulse whose amplitude and duration is determined by the charge on the load. A pull-up transistor is coupled to an output terminal for selectively supplying a voltage thereto in response to a first signal from a logic circuit. A pull-down transistor is coupled to the output terminal for selectively sinking a current therefrom in response to a second signal. A comparator circuit is coupled to the pull-down transistor, the logic circuit, and the output terminal, for selectively providing the second signal in response to the first signal and an output voltage on the output terminal.
-
Citations
23 Claims
-
1. A circuit for driving a capacitive load, said circuit comprising:
-
an output terminal coupled to the load; logic means for providing first and second signals; pull-up means coupled to said output terminal for selectively supplying a voltage thereto in response to said first signal; pull-down means coupled to said output terminal for selectively sinking a current therefrom in response to a third signal; comparator means responsive to a charge on the capacitive load and coupled to said output terminal for selectively providing a fourth signal having a time integral relative to said charge on the load; and gate means coupled to said pull-down means, said logic means and said comparator means for providing said third signal in response to said second and fourth signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A circuit for driving a capacitive load, said circuit comprising:
-
an output terminal coupled to the load; logic means for providing a first signal; pull-up means coupled to said output terminal for selectively supplying a voltage thereto in response to said first signal; pull-down means coupled to said output terminal for selectively sinking a current therefrom in response to a second signal; and comparator means responsive to a charge on the capacitive load and coupled to said pull-down means, said logic means, and said output terminal, for selectively providing said second signal in response to said first signal and an output voltage on said output terminal, said second signal having a time integral relative to said charge on the capacitive load. - View Dependent Claims (13, 14, 15, 16)
-
- 17. An improved ECL transient driver circuit including a logic means for providing a digital signal having first and second states in responsive to an input signal, a pull-up means coupled to said logic means for supplying current to a capacitive load during the first state, and a pull-down means for sinking current from the capacitive load during the second state, wherein the improvement comprises a comparator means coupled to said logic means, said load, and said pull-down means for enabling said pull-down means during the time period when the voltage on said load exceeds a predetermined relationship with the voltage of said digital signal during the second state.
Specification