Pre-conditioning a node of a circuit
Pre-conditioning circuitry for pre-conditioning a node of a circuit to support a change in operation of the circuit, wherein the circuit is operative to change a state of the node to effect the change in operation of the circuit, and wherein the pre-conditioning circuitry is configured to apply a voltage, current or charge directly to the node to reduce the magnitude of the change to the state of the node required by the circuit to achieve the change in operation of the circuit.
1. Pre-conditioning circuitry for pre-conditioning a node of a circuit to support a change in operation of the circuit,
wherein the circuit is operative to change a state of the node to effect the change in operation of the circuit,
wherein the pre-conditioning circuitry is configured to apply a voltage, current or charge directly to the node to reduce the magnitude of the change to the state of the node required by the circuit to achieve the change in operation of the circuit,
wherein the pre-conditioning circuitry comprises:
monitor circuitry configured to monitor a voltage of the circuitry; and
control circuitry configured to:
receive a monitor output signal from the monitor circuitry; and
responsive to the monitor output signal, apply the voltage, current or charge to the node if a characteristic of the monitored voltage meets a predefined condition, wherein the node is coupled to a control node of an output device of the circuit, and wherein the voltage, current or charge applied directly to the node by the pre-conditioning circuitry increases a bias voltage at the control node of the output device.
2. Pre-conditioning circuitry according to claim 1 , wherein the change in operation of the circuit is in response to: start-up of the circuit; a transient in a supply voltage to the circuit; a change in the supply voltage to the circuit, a transient in a load of the circuit; or a change in the load of the circuit.
3. Pre-conditioning circuitry according to claim 1 , wherein the characteristic comprises a magnitude or rate of change of the monitored voltage.
4. Pre-conditioning circuitry according to claim 1 , wherein the voltage comprises a supply voltage or an output voltage of the circuit.
5. Pre-conditioning circuitry according to claim 1 , wherein the circuit comprises a low dropout regulator circuit.
6. Pre-conditioning circuitry according to claim 1 , wherein the node comprises an output node of the circuit.
7. Pre-conditioning circuitry according to claim 1 , wherein the node is coupled to a capacitor of the circuit.
8. Pre-conditioning circuitry according to claim 7 , wherein the capacitor is a miller capacitor.
9. Pre-conditioning circuitry according to claim 1 , wherein the voltage, current or charge applied to the node is equal to or close to a voltage, current or charge that would otherwise be applied to the node by the circuit to achieve the change in operation of the circuit.
10. Pre-conditioning circuitry according to claim 1 , wherein the node is associated with a capacitance, and wherein the voltage, current or charge applied to the node is configured to compensate for the effect of the capacitance.
11. Pre-conditioning circuitry according to claim 10 , wherein the capacitance is a parasitic capacitance.
12. Pre-conditioning circuitry according to claim 1 , wherein the pre-conditioning circuitry is configured to apply the voltage, current or charge to the node in response to detection of a trigger condition that will trigger the change in operation of the circuit.
13. Pre-conditioning circuitry according to claim 12 , further comprising look-ahead circuitry configured to detect the trigger condition.
14. An integrated circuit comprising the circuitry of claim 1 .
15. A device comprising the circuitry of claim 1 .
16. A device according to claim 15 , wherein the device comprises a portable device, a battery powered device, a mobile telephone, a tablet or laptop computer, a smart speaker, an accessory device, a headset device, smart glasses, headphones, earphones or earbuds.