19017326. AC Coupling Modules for Bias Ladders (pSemi Corporation)
AC Coupling Modules for Bias Ladders
Organization Name
Inventor(s)
Simon Edward Willard of Irvine CA US
Tero Tapio Ranta of San Diego CA US
Matt Allison of Oceanside CA US
Shashi Ketan Samal of San Diego CA US
AC Coupling Modules for Bias Ladders
This abstract first appeared for US patent application 19017326 titled 'AC Coupling Modules for Bias Ladders
Original Abstract Submitted
A positive-logic FET switch stack that does not require a negative bias voltage, exhibits high isolation and low insertion/mismatch loss, and may withstand high RF voltages. Embodiments include a FET stack comprising series-coupled positive-logic FETs (i.e., FETs not requiring a negative voltage supply to turn OFF), series-coupled on at least one end by an âend-capâ FET of a type that turns OFF when its Vis zero volts. The one or more end-cap FETs provide a selectable capacitive DC blocking function or a resistive signal path. Embodiments include a stack of FETs of only the zero Vtype, or a mix of positive-logic and zero Vtype FETs with end-cap FETs of the zero Vtype. Some embodiments withstand high RF voltages by including combinations of series or parallel coupled resistor ladders for the FET gate resistors, drain-source resistors, body charge control resistors, and one or more AC coupling modules.