Research Article

FPGA Implementation of an Amplitude-Modulated Continuous-Wave Ultrasonic Ranger Using Restructured Phase-Locking Scheme

Table 1

Comparison of NCO frequency.

S. no.Input signal frequency (Hz)IPLL NCO frequency (Hz)RPLL NCO frequency (Hz)

14051155120
24557545760
35063946400
45570337040
56076727680