The Designer's Guide Community Forum

The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl
Design >> Analog Design >> Ring oscillator based ADC f_signal/f_ref ratio
https://designers-guide.org/forum/YaBB.pl?num=1342321233

Message started by mixed_signal on Jul 14^th, 2012, 8:00pm

Title: Ring oscillator based ADC f_signal/f_ref ratio
Post by mixed_signal on Jul 14^th, 2012, 8:00pm

The counter in a ring oscillator based ADC
counts freq_signal x pulse_width_ref or time_period_ref x freq_signal. Now if the counter is 10 bits I am wondering if their ratio should be 1024 for 10 bit resolution. If freq_signal=3khz and freq_ref=4khz, how do i make them work?

Shall i use divide by N counters to reduce one make the ratio....or is it done by counting multiple times till the counter is full?

Title: Re: Ring oscillator based ADC f_signal/f_ref ratio
Post by mixed_signal on Jul 15^th, 2012, 9:32am

Which current controlled ring oscilator has better frequenc v/s current linearity? 3 stage or 5 stage..if possible can anone cite references?