Patent ID: 7679422
Filing Date: 2010-03-16
Classification: G06G,G06J,H03H

Abstract:
1. An apparatus comprising: a switched-capacitor (SC) sampling circuit configured to receive an input signal and to selectively generate a sampled signal; an amplifier having differential input and differential outputs, wherein the differential inputs comprise a non-inverting and an inverting input configured to receive the sampled signal, and wherein the SC sampling circuit includes: a first and a second input port; a first input capacitor coupled between the input port and the non-inverting input of the amplifier; a second input capacitor coupled between the second input port and the inverting input of the amplifier; and a first cross-connect switch to selectively couple the first and second input capacitors together; an SC feedback circuit coupled between the differential inputs and the differential outputs to selectively control a feedback of the amplifier, wherein the SC feedback circuit comprises a feedback switch and a feedback variable capacitor coupled in series between the differential inputs and the differential outputs of the amplifier; and a comparator coupled to the differential outputs of the amplifier, wherein the SC sampling circuit and the SC feedback circuit are programmable to select between multiple analog functions of the apparatus; wherein the multiple analog functions comprises at least two analog functions selected from the group consisting of: an amplifier function, an integrator function, a comparator function, a modulator function, a variable gain amplifier function, a variable gain integrator function, a variable gain comparator function, and a variable gain modulator function.