This paper describes a new SC method to reduce the capacitor mismatching error and finite-gain error in an ADC. Through the use of switched-capacitor techniques, the proposed new ADC is insensitive to the capacitor-ratio accuracy as well as the finite gain and the offset voltage of the operational amplifiers. The switching error becomes the only major error source. Moreover, the cycle time for n-bit conversion is reduced to 4n-clock time. Both SWITCAP and Hspice simulations have been performed to verify the performance of the new ADC. It is shown that a 15-bit resolution at the sampling frequency of 20 KHz can be achieved when the capacitor ratios have a variation of 1% and the finite gain of the op amps is only 66 dB.
|Number of pages||4|
|Journal||Proceedings - IEEE International Symposium on Circuits and Systems|
|State||Published - 1 Dec 1994|
|Event||Proceedings of the 1994 IEEE International Symposium on Circuits and Systems. Part 3 (of 6) - London, England|
Duration: 30 May 1994 → 2 Jun 1994