Patent ID: 7408330

Claim:
A modulated voltage generator circuit comprising: an input node for receiving an input voltage; an output node for providing a modulated voltage, said modulated voltage alternating between a low level and a high level, said high level being substantially greater than said input voltage; a first FET configured to isolate said output node from said input node when said modulated voltage is at said high level; wherein said high level of said modulated voltage is greater than a breakdown voltage of said first FET; said modulated voltage generator circuit further comprising a first capacitor having a first terminal and a second terminal, said first terminal being coupled to said output node and said second terminal being coupled to a ground when said modulated voltage is at said low level and said second terminal being coupled to said input node when said modulated voltage is at said high level; said modulated voltage generator circuit further comprising a second FET having a source terminal, a drain terminal, and a gate terminal, wherein said source terminal of said second FET is coupled to said output node, said drain terminal of said second FET is coupled to a gate terminal of said first FET, and said drain terminal of said second FET is coupled to said input node, wherein said high level of said modulated voltage is greater than a breakdown voltage of said second FET.