Patent ID: 6856838

Claim:
A combination voltage converter circuit for performing multiple operating functions, the combination circuit comprising: an RF coil (L 1 ′) having a first end ( 72 ′), a second end ( 85 ), and a tap point ( 85 ′); a diode (D 1 ) connected between the first end ( 72 ′) of the RF coil (L 1 ′) and an output node ( 75 ′); a first capacitor (C 1 ) connected between the output node ( 75 ′) and ground potential ( 87 ); a first transistor switch (M 1 ′) connected between the second end ( 85 ) of the coil (L 1 ′) and a primary power source (VS); a second transistor switch (M 2 ) connected between the tap point ( 85 ) and the primary power source (VS); a second diode (D 2 ) connected between the tap point ( 85 ) and ground potential ( 87 ); a data amplifier (U 1 ) having an input and an output; a third diode (D 3 ) connected between the first end ( 72 ′) of the RF coil (L 1 ′) and the input of the data amplifier (U 1 ); a third transistor switch (M 3 ) connected between the input of the data amplifier (U 1 ) and ground potential ( 87 ); a tuning capacitor (C 3 ′) having a first side connected to the first end ( 72 ′) of the RF coil (L 1 ′) and a second side connected to the tap point ( 85 ′) through a fourth transistor switch (M 4 ); and a fifth transistor switch (M 5 ) connected between the tap point ( 85 ′) and ground potential ( 87 ).