Switched Capacitor Negative DC To Negative DC Voltage Doubler

The circuit is a switched capacitor negative DC to negative DC voltage doubler. When the clock output is negative the switch Sw is in position 1, this connects the positive electrode of the flying/charge pump capacitor Ccp to ground and the negative electrode of Ccp to the negative terminal of power supply Vsn. This charges capacitor Ccp to Vsn. When the clock output is at ground the switch Sw is in position 2, this connects the positive electrode of capacitor Ccp to the negative terminal of power supply Vsn and the negative electrode of Ccp to the negative terminal of reservoir capacitor Cres. Thus, Ccp is placed in series with the power supply effectively doubling the voltage available to the output. Output/reservoir capacitor Cres is charged to this stacked voltage which it will provide to the load when clock output returns negative.