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1. (WO2018200523) CONTROLLING NOISE TRANSFER FUNCTION OF SIGNAL PATH TO REDUCE CHARGE PUMP NOISE

Pub. No.:    WO/2018/200523    International Application No.:    PCT/US2018/029137
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 25 01:59:59 CEST 2018
IPC: H03F 3/213
H03F 3/187
H03F 1/02
Applicants: CIRRUS LOGIC INTERNATIONAL SEMICONDUCTOR, LTD.
DHANANJAY, Pradeep
Inventors: DHANANJAY, Pradeep
DAS, Tejasvi
MANOLA, Bhupendra
DUEWER, Bruce E.
Title: CONTROLLING NOISE TRANSFER FUNCTION OF SIGNAL PATH TO REDUCE CHARGE PUMP NOISE
Abstract:
An apparatus may include a delta-sigma modulator for quantization noise shaping of a digital signal, a digital-to-analog converter configured to generate an analog signal from the digital signal, and an amplifier configured to amplify the analog signal and powered from a charge pump, wherein the charge pump is configured to operate at a switching frequency approximately equal to a zero of a modulator noise transfer function of the delta-sigma modulator, such that the impact of charge pump noise on a total harmonic distortion noise of the apparatus is minimized.