Patent ID: 7081790
Filing Date: 2006-07-25
Classification: H03G,H03H

Abstract:
1. An adjustable bandwidth high pass filter, comprising: an input configured to receive a voltage signal; a first capacitor coupled to said input; a resistance ladder coupled between said first capacitor and a ground and configured to divide said voltage signal into a plurality of voltage levels at a plurality of outputs; a resistor coupled to said first capacitor; a transistor coupled in series with said resistor at a node; a second capacitor coupled between said node and a control terminal of said transitor; a first device coupled to said control terminal; and a second device coupled to said control terminal; wherein said resistor and said transistor are coupled in parallel with said resistance ladder, said transistor is configured to act as a switch, said first device is configured to switch said transistor between a conducting state and a nonconducting state, and said second capacitor and said second device are configured to maintain said transistor in said nonconducting state, when said transistor has been placed in said nonconducting state by said first device, regardless of a voltage received by said transistor.