Design of a CMOS differential difference amplifier and its applications in A/D and D/A converters

Author

Huang, Shu-Chuan ; Ismail, Mohammed

Author_Institution

Dept. of Electr. Eng., Tatung Inst. of Technol., Taipei, Taiwan

fYear

1994

fDate

5-8 Dec 1994

Firstpage

478

Lastpage

483

Abstract

The differential difference amplifier (DDA) is an extension of an opamp with two differential inputs. DDA-based circuits often provide high input impedance and simple external circuitry due to the feature of differential difference inputs. Therefore, DDA-based circuits are competitive alternatives to opamp-based circuits. In this paper, we will present the design of a DDA using a proposed linear V-I converter whose linearity is improved by the body effect. This DDA possesses almost rail-to-rail input common-mode range and output swing and is therefore suitable for low-voltage applications. The DDA was fabricated in a MOSIS 2 μm p-well process, and its simulation and experimental results are provided. Applications in A/D and D/A converters are discussed

Keywords

CMOS analogue integrated circuits; analogue-digital conversion; convertors; differential amplifiers; digital-analogue conversion; 2 micron; A/D converters; CMOS differential difference amplifier; D/A converters; MOSIS p-well process; body effect; linear V-I converter; low-voltage applications; rail-to-rail input common-mode range; Circuits; Differential amplifiers; Filters; Impedance; Linearity; MOSFETs; Rail to rail inputs; Telephony; Threshold voltage; Virtual colonoscopy;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1994. APCCAS '94., 1994 IEEE Asia-Pacific Conference on

Conference_Location

Taipei

Print_ISBN

0-7803-2440-4

Type

conf

DOI

10.1109/APCCAS.1994.514597

Filename

514597