Frequency-selective compensation in ranging receivers utilizing chirped waveforms

Abstract

An integrated circuit that includes an analog frequency-selective gain filter having a frequency-selective gain corresponding to a high-pass filter prior to an analog-to-digital converter (ADC) is described. During operation, the analog frequency-selective gain filter may provide frequency-selective gain (such as a high-pass filter characteristic) to an electrical signal corresponding to a received signal (such as a LiDAR signal, a sonar signal, an ultrasound signal and/or a radar signal) in a ranging receiver. Note that the received signal may correspond to a received frequency-modulated continuous-wave (FMCW) signal. Moreover, the integrated circuit may include a digital processing circuit after the ADC and control logic that instructs the digital processing circuit to characterize the frequency-selective gain (such as an amplitude and/or a phase at a frequency) during a calibration mode. Furthermore, the digital processing circuit may correct an output signal from the ADC based at least in part on the characterized frequency-selective gain.