Title :
A 110-dB-THD, 18-mW DAC using sampling of the output and feedback to reduce distortion
Author :
Thomsen, Axel ; Kasha, Dan B. ; Wang, Lei ; Lee, Wai L.
Author_Institution :
Crystal Semicond. Div., Cirrus Logic Inc., Austin, TX, USA
fDate :
12/1/1999 12:00:00 AM
Abstract :
A one-bit digital-to-analog converter architecture is presented that reduces distortion through the use of feedback. The only critical circuit in this architecture is identical to the first integrator of a ΔΣ analog-to-digital converter. All other circuits in the system are embedded in the feedback loop, which reduces the effects of their nonidealities. Special attention was given to the distortion arising from the discrete-time to continuous-time interface. The feedback loop is a conditionally stable system using multipath feedforward compensation. A total harmonic distortion of -110 dB is achieved. The signal-to-noise ratio is 114 dB in 400 Hz, and out-of-band noise is below -50 dB using only one external component. The power consumption is 18 mW from a 5-V supply. Die area is 3.6 mm2 in 0.6-μm DPTM-CMOS technology
Keywords :
CMOS integrated circuits; circuit feedback; digital-analogue conversion; harmonic distortion; low-power electronics; 0.6 micron; 1 bit; 18 mW; 400 Hz; 5 V; DPTM-CMOS technology; circuit architecture; digital-to-analog converter; feedback; integrator; multipath feedforward compensation; out-of-band noise; output sampling; signal-to-noise ratio; total harmonic distortion; Circuits; Digital-analog conversion; Feedback loop; Logic; Low pass filters; Output feedback; Sampling methods; Semiconductor device noise; Signal to noise ratio; Total harmonic distortion;
Journal_Title :
Solid-State Circuits, IEEE Journal of
