Patent ID: 7728649
Filing Date: 2010-06-01
Classification: H03K

Abstract:
1. An integrated analog switch, comprising: a first semiconductor device having first and second current terminals, a control terminal and a body, wherein said first and second current terminals are coupled to first and second switch terminals, respectively; wherein said first semiconductor device, when turned off, causes a first leakage current between said body of said first semiconductor device and said first switch terminal; a second semiconductor device comprising first and second current terminals, a control terminal and a body, wherein said first current terminal of said second semiconductor device is coupled to said first switch terminal and wherein said second current terminal of said second semiconductor device is coupled to said body of said first semiconductor device; wherein said second semiconductor device, when turned off, causes a second leakage current between said body of said second semiconductor device and said first switch terminal, wherein said second leakage current is proportional to said first leakage current; and a first current mirror circuit, coupled to said first switch terminal and to said body of said second semiconductor device, which mirrors and amplifies said second leakage current to provide a first cancellation current which is applied to said first switch terminal, wherein said first cancellation current is equivalent to a sum of said first and second leakage currents.