Adjustable voltage divider circuit and method

A circuit comprising:

• a first capacitive device coupled between a first node and a second node;
• a second capacitive device coupled between a third node and a fourth node;
• a first switching device coupled between the first node and a voltage node;
• a second switching device coupled between the second node and a reference voltage node;
• a third switching device coupled between the third node and the voltage node;
• a fourth switching device coupled between the fourth node and the reference voltage node;
• fifth through eighth switching devices coupled between the respective first through fourth nodes and an output node;
• and
• first and second variable capacitance devices coupled in parallel with one of a respective combination of:
• the sixth switching device and the eighth switching device, or
• the fifth switching device and the seventh switching device.

A method of operating a circuit, the method comprising:

• receiving an input voltage at a voltage node of the circuit, the circuit further comprising:
• a first capacitive device coupled between first and second nodes;
• a second capacitive device coupled between third and fourth nodes;
• a first switching device coupled between the first node and the voltage node;
• a second switching device coupled between the second node and a reference voltage node;
• a third switching device coupled between the third node and the voltage node;
• a fourth switching device coupled between the fourth node and the reference voltage node;
• fifth through eighth switching devices coupled between the respective first through fourth nodes and an output node;
• and
• first and second variable capacitance devices coupled in parallel with one of a respective combination of:
• the sixth switching device and the eighth switching device,
• the series of the first capacitance device and the second switching device and the series of the second capacitive device and the fourth switching device,
• the fifth switching device and the seventh switching device, or
• the second switching device and the fourth switching device;
• and
• generating an output voltage on the output node by alternatively switching the first, fourth, sixth, and seventh switching devices with the second, third, fifth, and eighth switching devices.