Circuits for providing power supply using floating capacitive supply
Various embodiments include methods and circuits for providing power supply to circuits using floating capacitive supply. A circuit includes a power supply, a capacitor, an analog circuit, a first plurality of switches communicatively coupled between the power supply and the capacitor, and a second plurality of switches communicatively coupled between the capacitor and the analog circuit. The first plurality of switches and the second plurality of switches are configured to implement a charging configuration in the circuit and a discharging configuration in the circuit.
1 . A circuit comprising:
a power supply;
a first capacitor;
a second capacitor,
a sub-circuit comprising an input port and an output port, the second capacitor being coupled opertatively coupled between the input port and the output port;
a first plurality of switches operatively coupling the power supply and the first capacitor in parallel; and
a second plurality of switches operatively coupling the first capacitor and the sub-circuit in parallel, the first plurality of switches and the second plurality of switches being operated in mutually exclusive states such that when the first plurality of switches is closed, the second plurality of switches is open, and vice versa;
during a discharging configuration:
the first plurality of switches being in an open state to prevent current from flowing from the power supply to the first capacitor; and
the second plurality of switches being in a closed state to allow current to flow from the first capacitor to the sub-circuit such that the sub-circuit is powered by a floating capacitive supply;
during a charging configuration:
the first plurality of switches being in a closed state to allowed current to flow from the power supply to the first capacitor; and
the second plurality of switches being in an open state to prevent current from flowing from the first capacitor to the sub-circuit.
2 . The circuit of claim 1 , wherein the sub-circuit comprises one or more analog components.
3 . The circuit of claim 1 , wherein the first plurality of switches and the second plurality of switches are controlled based on a clock signal.
4 . The circuit of claim 1 , further comprising:
a first set of capacitors that includes the first capacitor.
5 . The circuit of claim 4 , wherein capacitors in the first set of capacitors are operatively coupled in parallel during the charging configuration in the circuit.
6 . The circuit of claim 4 , wherein capacitors in the first set of capacitors are operatively coupled in series during the discharging configuration in the circuit.
7 . A method comprising:
receiving a first signal to charge a first capacitor in a system circuit, the system circuit comprising a power supply, the first capacitor, a second capacitor, a sub-circuit, a first plurality of switches operatively coupling the power supply and the first capacitor in parallel, and a second plurality of switches operatively coupling the first capacitor and the sub-circuit in parallel, the sub-circuit comprising an input port and an output port, the second capacitor being coupled operatively coupled between the input port and the output port, the first plurality of switches and the second plurality of switches being operated in mutually exclusive states such that when the first plurality of switches is closed, the second plurality of switches is open, and vice versa;
in response to receiving the first signal, configuring the first plurality of switches and the second plurality of switches to operate in a charging configuration, the charging configuration causing the first capacitor to charge using the power supply, the configuring of the first plurality of switches and the second plurality of switches to operate in the charging configuration comprising:
configuring the first plurality of switches in a closed state to allow current to flow from the power supply to the first capacitor; and
configuring the second plurality of switches in an open state to prevent current from flowing from the first capacitor to the sub-circuit;
receiving a second signal to supply power from the first capacitor to the sub-circuit; and
in response to receiving the second signal, configuring the first plurality of switches and the second plurality of switches to operate in a discharging configuration, the discharging configuration causing the first capacitor to discharge to the sub-circuit, the configuring of the first plurality of switches and the second plurality of switches to operate in the discharging configuration comprising:
configuring the first plurality of switches in an open state to prevent current from flowing from the power supply to the first capacitor; and
configuring the second plurality of switches in a closed state to allow current to flow from the first capacitor to the sub-circuit.
8 . The method of claim 7 , wherein the sub-circuit comprises one or more analog components.
9 . The method of claim 7 , wherein the first plurality of switches and the second plurality of switches are controlled based on a clock signal.
10 . The method of claim 7 , wherein the system circuit comprises a first set of capacitors that includes the first capacitor.
11 . The method of claim 10 , wherein capacitors in the first set of capacitors are operatively coupled in parallel during the charging configuration in the system circuit.
12 . The method of claim 10 , wherein capacitors in the first set of capacitors are operatively coupled in series during the discharging configuration in the system circuit.