DC-coupled peak detector

摘要

Techniques are disclosed relating to peak detection. In one embodiment, an apparatus is disclosed that includes an amplifier configured to amplify a signal. The apparatus further includes a peak detector DC coupled to an output of the amplifier. The peak detector includes a first comparator stage configured to perform subtraction of a threshold signal from the amplified signal. The peak detector further includes a second comparator stage is configured to amplify a differential output signal of the first comparator stage indicative of a result of the subtraction. In some embodiments, the amplifier and peak detector are included within automatic gain control system in a path for an in-phase or quadrature channel of the receiver chain.

主权项

1. An apparatus, comprising:
an amplifier configured to amplify a signal; a peak detector direct-current (DC) coupled to an output of the amplifier, wherein the peak detector includes:
a first comparator stage configured to perform subtraction of a threshold signal from the amplified signal; anda second comparator stage configured to amplify a differential output signal of the first comparator stage indicative of a result of the subtraction; and a digital-to-analog converter (DAC) configured to apply an offset compensation signal to an input of the amplifier, wherein the offset compensation signal reduces an offset of a receiver chain that includes the amplifier and the peak detector.