Patent ID: 6362763
Filing Date: 2002-03-26
Classification: H03M

Abstract:
An analog-to-digital converter modulator circuit comprising:an input conductor; an output conductor; at least one integrator stage having: an operational amplifier comprising a first restore switch coupled between an inverting input and a non-inverting input; and a second restore switch coupled between an inverting output and a non-inverting output; a first integrating capacitor coupled between the inverting input and non-inverting output; and a second integrating capacitor coupled between the non-inverting input and inverting output; a feedforward conductor coupled to the outputs of each integrator stage; a first summing junction configured to receive and sum data signals carried on the feedforward conductors, and to generate an output signal on the output conductor; a second summing junction configured to receive and sum data signals carried on the input conductor and a feedback conductor coupled to the output conductor and to generate an output signal to an input of one of the at least one integrator stage; and an unstable condition detector coupled to the output conductor and configured to generate a signal to activate each of the first and second restore switches upon detection of an unstable condition on the output conductor.