US 11,943,592 B2
Single to differential conversion in silicon microphone amplifiers
Jose Luis Ceballos, Villach (AT); Hong Chen, Villach (AT); Fulvio CiCiotti, Villach (AT); and Andreas Wiesbauer, Poertschach (AT)
Assigned to INFINEON TECHNOLOGIES AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Apr. 11, 2022, as Appl. No. 17/658,716.
Prior Publication US 2023/0328433 A1, Oct. 12, 2023
Int. Cl. H04R 3/02 (2006.01); H03F 3/45 (2006.01); H04R 19/04 (2006.01); H04R 29/00 (2006.01)
CPC H04R 3/02 (2013.01) [H03F 3/45475 (2013.01); H04R 19/04 (2013.01); H04R 29/004 (2013.01); H03F 2200/03 (2013.01); H04R 2201/003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A single-ended to differential converter, comprising:
a converter input, a first converter output, a second converter output, and an internal node, wherein the first converter output and the second converter output comprise a differential output;
a non-inverting amplifier having an input coupled to the converter input, and an output coupled to the first converter output;
an inverting amplifier having an input coupled to the first converter output, and an output coupled to the second converter output;
a charge pump having a charge pump output capacitor coupled between the second converter output and the internal node; and
a feedback capacitor coupled between the first converter output and the internal node.