ppgpsdo

ppgpsdo is a reference implementation for a GNSS-discipled oscillator.

Requisites:

• FPGA running with PulsePins design using external clock signal (EXT_CLK pin) fron a tunable oscillator (e.g. OXCO, TXCO)
• pulse-per-second signal from a GNSS received applied to PPS pin
• DAC on PP_PMOD controls the frequency of the tunable oscillators

Command line switches:

• -kp: coefficient for proportional part of PID