Patent ID: 9513651
Filing Date: 2016-12-06
CPC Classification: G05F,H03M

Claim Text:
1. A delta-sigma modulator configured to digitize an input analog signal, the delta-sigma modulator comprising: a two port network device for receiving the input analog signal and outputting a first output analog signal; a feedback DAC for receiving a digital input signal and outputting a second output analog signal, wherein the first output analog signal and the second output analog signal combine to form an integrator input voltage; a first stage integrator generating a scaled integral voltage of the integrator input voltage, the first stage integrator including a substantially non-linear integrator that includes a Gm cell loaded by a capacitor; and a virtual ground node formed by connecting the two port network device, the feedback DAC, and the first stage integrator, the virtual ground node configured to reduce swing and improve linearity.