[time-nuts] new tdc from Texas

Attila Kinali attila at kinali.ch
Thu Mar 5 13:56:08 EST 2015

On Thu, 05 Mar 2015 09:39:44 -0500
Ben Gamari <bgamari at physics.umass.edu> wrote:

> Is this just a function of the ring oscillator
> duty cycle being much smaller?

There has been some development on how to do ring oscillators for
TDC applications in recent years. Driven to a large part by the need
for better (longer measure time, higher resolution, better linearity)
TDCs for all digital PLLs (ADPLL).

I haven't read it completely yet, but Straayers dissertation [1]
gives a nice overview of a couple of methods on how to enhance
ring oscillators for the use as a TDC.

I also find [2] quite nice. They use delay lines to both store pulses
and to stretch them. This enables them to work similar to a
pipeline ADC. (I haven't read the paper completely either, so
i might have misunderstood some stuff)

			Attila Kinali

[1] "Noise Shaping Techniques for Analog and Time to Digital Converters
Using Voltage Controlled Oscillators", by Straayer, 2008

[2] "A 9 bit, 1.12ps Resolution 2.5b/Stage Pipelined Time-to-Digital
Converter in 65nm CMOS using Time-Register", by Kim, Yu, Cho, 2014

< _av500_> phd is easy
< _av500_> getting dsl is hard

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