Multi-function linear threshold gate with input based adaptive threshold
An apparatus and configuring scheme where a capacitive input circuit can be programmed to perform different logic functions by adjusting the switching threshold of the capacitive input circuit. Digital inputs are received by respective capacitors on first terminals of those capacitors. The second terminals of the capacitors are connected to a summing node. A pull-up and pull-down device are coupled to the summing node. The pull-up and pull-down devices are controlled separately. During a reset phase, the pull-up and/or pull-down devices are turned on or off in a sequence, and inputs to the capacitors are set to condition the voltage on node n 1 . As such, a threshold for the capacitive input circuit is set. After the reset phase, an evaluation phase follows. In the evaluation phase, the output of the capacitive input circuit is determined based on the inputs and the logic function configured during the reset phase.
1. An apparatus comprising:
a first input;
a second input;
a summing node;
a first capacitor having a first terminal coupled to the first input and a second terminal coupled to the summing node;
a second capacitor having a third terminal coupled to the second input and a fourth terminal coupled to the summing node; and
a pull-up device coupled to the summing node and a power supply rail, wherein the pull-up device is controlled by a first control, wherein the first input, the second input, and the first control are set in a first operation mode to adjust a threshold of the apparatus, wherein the first control is to cause the pull-up device to be off in a second operation mode, and wherein the second operation mode occurs after the first operation mode.
2. The apparatus of claim 1 , wherein, in the first operation mode, the threshold of the apparatus is adjusted to 1 after the pull-up device is enabled, and the first input and the second input are set to logic 1.
3. The apparatus of claim 1 , wherein, in the first operation mode, the threshold of the apparatus is adjusted to 0 after the pull-up device is enabled, and the first input is set to logic 1 and the second input is set to logic 0.
4. The apparatus of claim 1 , wherein, in the first operation mode, the threshold of the apparatus is adjusted to 0 after the pull-up device is turned off, and the first input is set to logic 0 and the second input is set to logic 0.
5. The apparatus of claim 1 , wherein the first capacitor and the second capacitor include a linear dielectric material which includes one of: SiO 2 , Al 2 O 3 , Li 2 O, HfSiO 4 , Sc 2 O 3 , SrO, HfO 2 , ZrO 2 , Y 2 O 3 , Ta 2 O 5 , BaO, WO 3 , MoO 3 , or TiO 2 .
6. The apparatus of claim 1 , wherein the first capacitor and the second capacitor include:
a linear dielectric material includes one or more of: Si, Al, Li, Hf, Sc, Sr, Zr, Y, Ta, Ba, W, Mo, or Ti; and
a top electrode and a bottom electrode, wherein the linear dielectric material is between the top electrode and the bottom electrode, and wherein the top electrode or the bottom electrode include one or more of: Cu, Al, Ag, Au, W, or Co.
7. The apparatus of claim 1 , wherein capacitance of the first capacitor is substantially equal to the capacitance of the second capacitor.
8. The apparatus of claim 1 , wherein capacitance of the first capacitor is substantially different to the capacitance of the second capacitor.
9. An apparatus comprising:
a capacitive input circuit having a first input, a second input, and a first control, wherein the first control is to pull-down a voltage on a summing node to a ground, wherein the summing node is connected to a first capacitor and a second capacitor of the capacitive input circuit, wherein the first input is received by the first capacitor, and wherein the second input is received by the second capacitor; and
a circuit to configure the first input, the second input, and the first control during a reset phase to adjust a threshold of the capacitive input circuit.
10. The apparatus of claim 9 , wherein the circuit is to configure a logic function of the capacitive input circuit by adjusting the threshold of the capacitive input circuit.
11. The apparatus of claim 9 , wherein the first control turns off a pull-down device during an evaluation phase separate from the reset phase.
12. The apparatus of claim 11 , wherein, in the reset phase, the threshold of the apparatus is adjusted to 2 after the pull-down device is enabled and the first input and the second input are set to logic 0.
13. The apparatus of claim 11 , wherein, in the reset phase, the threshold of the apparatus is adjusted to 2 after the pull-down device is enabled and the first input and the second input are set to logic 1.
14. The apparatus of claim 11 , wherein, in the reset phase, the threshold of the apparatus is adjusted to 2 after the pull-down device is enabled and the first input is set to logic 1 and the second input are set to logic 0.
15. A system comprising:
a processor circuitry to execute one or more instructions;
a memory coupled to the processor circuitry, the memory to store the one or more instructions; and
a communication interface to allow the processor circuitry to communicate with another device, wherein the processor circuitry includes a configurable logic, wherein the configurable logic comprises:
a first input;
a second input;
a summing node;
a first capacitor having a first terminal coupled to the first input, and a second terminal coupled to the summing node;
a second capacitor having a third terminal coupled to the second input, and a fourth terminal coupled to the summing node;
a pull-up device coupled to the summing node and a power supply rail, wherein the pull-up device is controlled by a first control; and
a pull-down device coupled to the summing node and a ground, wherein the pull-down device is controlled by a second control, and wherein the first input, the second input, the first control, and the second control are set during a reset phase to adjust a threshold of the configurable logic.
16. The system of claim 15 , wherein the first control and the second control turn off the pull-up device and the pull-down device during an evaluation phase separate from the reset phase.
17. The system of claim 15 , wherein, in the reset phase, a threshold of the configurable logic is adjusted to 2 after the pull-down device is enabled and the pull-up device is turned off, and the first input and the second input are set to logic 0.
18. The system of claim 15 , wherein, in the reset phase, a threshold of the configurable logic is adjusted to 2 after the pull-down device is enabled and the pull-up device is turned off, and the first input is set to logic 1 and the second input is set to logic 0.
19. The system of claim 15 , wherein, in the reset phase, a threshold of the configurable logic is adjusted to 2 after the pull-down device is enabled and the pull-up device is turned off, and the first input is set to logic 1 and the second input is set to logic 1.
20. The system of claim 15 , wherein, in the reset phase, a threshold of the configurable logic is adjusted to 1 after the pull-down device is disabled and the pull-up device is turned on, and the first input is set to logic 1 and the second input is set to logic 1.