US 12,483,207 B2
Circuitry, circuit module, system and method for impedance matching and signal attenuation
Daniel Schrögendorfer, Linz (AT); and Thomas Leitner, Pregarten (AT)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Mar. 24, 2023, as Appl. No. 18/189,588.
Claims priority of application No. 22168883 (EP), filed on Apr. 19, 2022.
Prior Publication US 2023/0336131 A1, Oct. 19, 2023
Int. Cl. H03F 1/32 (2006.01); H03F 1/26 (2006.01); H03F 3/195 (2006.01)
CPC H03F 3/195 (2013.01) [H03F 1/26 (2013.01); H03F 2200/294 (2013.01); H03F 2200/451 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A radio frequency front end (RFFE) circuit comprising:
a signal input configured to be coupled to an inductive matching element of the RFFE, the inductive matching element having a first output impedance for a radio frequency (RF) signal;
a signal output configured to be coupled to an input of an amplifier of the RFFE, the input of the amplifier having a first input impedance for the RF signal;
a reference output configured to be coupled to a reference potential;
a switchable capacitive element coupled between the signal input and the signal output when the circuit is in a first operating mode; and
a switchable resistive element coupled between the signal output and the reference output when the circuit is in the first operating mode, wherein:
the switchable capacitive element is configured to convert the first output impedance of the inductive matching element to a second output impedance at an output of the switchable capacitive element when the circuit is in the first operating mode, wherein the second output impedance is less than the first output impedance, and
the switchable resistive element is configured to convert the first input impedance of the amplifier at the signal output to the second output impedance at the output of the switchable capacitive element and to attenuate the RF signal provided from the inductive matching element to the amplifier, when the circuit is in the first operating mode, wherein the second output impedance is less than the first input impedance.