Title :
A Multi-Path Gated Ring Oscillator TDC With First-Order Noise Shaping
Author :
Straayer, Matthew Z. ; Perrott, Michael H.
Author_Institution :
Cambridge Analog Technol., Inc., Bedford, MA
fDate :
4/1/2009 12:00:00 AM
Abstract :
An 11-bit, 50-MS/s time-to-digital converter (TDC) using a multipath gated ring oscillator with 6 ps of effective delay per stage demonstrates 1st-order noise shaping. At frequencies below 1 MHz, the TDC error integrates to 80 fs (rms) for a dynamic range of 95 dB with no calibration required. The 157 times 258 mum TDC is realized in 0.13 mum CMOS and, depending on the time difference between input edges, consumes 2.2 to 21 mA from a 1.5 V supply.
Keywords :
analogue-digital conversion; digital phase locked loops; noise; oscillators; GRO-TDC; current 2.2 mA to 21 mA; differential nonlinearity; digital PLL; first-order noise shaping; multi-path gated ring oscillator; time-to-digital converter; voltage 1.5 V; Charge pumps; Clocks; Digital circuits; Digital filters; Frequency synthesizers; Linearity; Noise shaping; Phase locked loops; Ring oscillators; Signal generators; Noise-shaping; phase detector; quantizer; ring oscillator; time-to-digital converter;
Journal_Title :
Solid-State Circuits, IEEE Journal of
DOI :
10.1109/JSSC.2009.2014709
