Switched averaging error amplifier

摘要

A signal averaging circuit includes a plurality of switched weighted current sources to generate a total amount of charge. The total amount of charge is representative of a weighted sum of a plurality of input signal samples during an active period of a read enable signal. A timing control signal generator is coupled to receive an input signal and the read enable signal and sequentially switch the plurality of switched weighted current sources to adjust the total amount of charge in response to the input signal during the active period of the read enable signal. A storage circuit is coupled to the plurality of switched weighted current sources to convert the total amount of charge into a voltage representative of an output signal.

主权项

1. A signal averaging circuit, comprising:
a plurality of switched weighted current sources to generate a total amount of charge, wherein the total amount of charge is representative of a weighted sum of a plurality of input signal samples during an active period of a read enable signal; a timing control signal generator coupled to receive an input signal and the read enable signal, the timing control signal generator is further coupled to sequentially switch the plurality of switched weighted current sources to adjust the total amount of charge in response to the input signal during the active period of the read enable signal, wherein the timing control signal generator comprises:
a ramp generator to generate a plurality of ramp signals; anda plurality of comparators, wherein each one of the plurality of comparators is coupled to control a corresponding one of the plurality of switched weighted current sources in response to a comparison of a corresponding one of the plurality of ramp signals and the input signal; and a storage circuit coupled to the plurality of switched weighted current sources to convert the total amount of charge into a voltage representative of an output signal.