Low-voltage rail-to-rail CMOS differential difference amplifier

Chung-Chih Hung*, Mohammed Ismail, Kari Halonen, Veikko Porra

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

22 Scopus citations


This paper introduces a low-voltage rail-to-rail wide range CMOS Differential Difference Amplifier (DDA). The input stage of this DDA comprises two rail-to-rail V-I converters with large signal handling capability. In each V-I converter, an N-type converter cell is connected in parallel with its P-type counterpart cell in order to cover all the operating range of the common-mode input voltage. Its constant transconductance is achieved through the use of two maximum-current selecting circuits and an output substraction stage. Simulation results of the DDA with 3 V supply show that the DDA has a rail-to-rail constant input transconductance, a rail-to-rail output swing, 66dB open-loop gain, and a 2.2 MHz bandwidth with CL = 30pF and RL = 250Ω. Low-voltage DDA-based circuits, such as an adder/substractor and an integrator, are given in this paper. They constitute basic blocks of modern low-voltage analog signal and information processing systems.

Original languageEnglish
Pages (from-to)145-148
Number of pages4
JournalProceedings - IEEE International Symposium on Circuits and Systems
StatePublished - 1 Jan 1997
EventProceedings of the 1997 IEEE International Symposium on Circuits and Systems, ISCAS'97. Part 4 (of 4) - Hong Kong, Hong Kong
Duration: 9 Jun 199712 Jun 1997

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