June
2005, Issue 179
Precision
Frequency Meter
Cypress
PSoC High Integration Challenge 2004 Contest Winner
THINKING
AHEAD
The
meter works well as it is, but a possible enhancement
would involve using the crystal oven. You could mount
a voltage reference device in the oven and use the constant
voltage to reference a sigma-delta ADC. This would enable
you to use the system as an accurate voltage meter.
But it would require a means to measure the voltage
reference against a standard. There may be a free time
standard, but there isn’t a free voltage standard!
