Thanks Tom, The "front end" is still 75ALS176, but I put another simple transistor circuit from wenzel to to compare the performance. http://www.wenzel.com/wp-content/uploads/diffsqr.gif
2014-12-12 17:04 GMT+08:00, Tom Van Baak <[email protected]>: > This large posting is from Li Ang. > /tvb > > ----- Original Message ----- > From: Li Ang > To: Discussion of precise time and frequency measurement > Sent: Thursday, December 11, 2014 7:37 AM > Subject: Re: [time-nuts] Homebrew frequency counter, need help > > > Hi Bob, > I've sent the PCB to the factory and I am waiting for the new board. This > time, it's a 4-layer borad and changed from CPLD to FPGA. This is the first > time of FPGA & 4-layer project. Hope everthing be OK. > TPS79333 as the LDO for TDC. Better PSRR and noise spec than before > (XC6206). Analog and digital parts have their dedicated LDO. > > > While I'm waiting the the new board. I did a test with PRS10 & FE5650 > with current board. It's strange that the 20s adev of "without linear > regression" is better than "with linear regression". _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
