A 10 Bit All-Parallel A/D Converter

This paper describes a 10 bit all-parallel analog-to-digital converter with 20 MHz conversion rate. Static accuracy was achieved by suppressing the offset voltage of pair transistors to be below 0.5 mV, and by laser trimming technology to improve nonlinearity of the dc reference voltages. In regard to dynamic accuracy, an SNR of 53 dB was observed at input signal frequencies up to 1 MHz. A 3 µm bipolar process is adopted, which integrates nearly 40,000 elements onto a 9.2×9.8 mm chip.