Title :
A 13-bit, 160 kHz, differential analog to digital converter
Author_Institution :
SGS-Thomson Microelectron., Grenoble, France
Abstract :
The author describes a 13-bit, 160-kHz differential ADC (analog-to-digital converter), and an 80-kHz version, both including a reference circuit delivering two voltages that are symmetrical with respect to the power supply midpoint. These circuits are implemented in the 1.2- mu m CMOS double-metal process using an extra n+ diffusion to accommodate poly/n+ capacitors. Starting from the k-bit linearity requirement for the capacitor array and considering previous results, the bits were partitioned into P=4 bits for the resistor-string and K=9 bits for the capacitor array. The fast Fourier transform (FFT) result is shown for a 5-kHz sine-wave full-scale input sampled at 160 kHz. The performance of the circuit is summarized.<>
Keywords :
CMOS integrated circuits; analogue-digital conversion; digital integrated circuits; 1.2 micron; 13 bit; CMOS double-metal process; FFT; bit partitioning; capacitor array; differential analog to digital converter; k-bit linearity requirement; n+ diffusion; poly/n/sup +/ capacitors; reference circuit; resistor-string; sine-wave full-scale input; Analog-digital conversion; Frequency conversion; Solid state circuits; Voltage;
Conference_Titel :
Solid-State Circuits Conference, 1989. Digest of Technical Papers. 36th ISSCC., 1989 IEEE International
Conference_Location :
New York, NY, USA
DOI :
10.1109/ISSCC.1989.48216
