Dual-mode design of fully differential circuits using fully balanced operational amplifiers

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Dual-mode design of fully differential circuits using fully balanced operational amplifiers

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Fully differential (F-D) analogue circuits are usually designed focusing only on their differential-mode (DM) behaviour, without considering common-mode (CM) responses. A technique is presented for the design of both DM and CM circuit responses, using fully balanced operational amplifiers (FBOAs) as analogue building blocks. FBOAs work with CM and DM voltages as a whole, having an ideally infinite gain for both modes. This allows independent design of CM and DM dynamics. Inverting and non-inverting F-D topologies can be implemented in a simple way, similar to the implementation of their single-ended counterparts. Some typical application circuits are analysed and discussed and, as a design example, a ‘double-mode oscillator’ (a circuit that has independent CM and DM oscillations) was built and experimentally evaluated.

Inspec keywords: integrated circuit design; operational amplifiers; network topology; analogue integrated circuits

Other keywords: dual-mode design; double-mode oscillator; fully differential analogue circuits; common-mode responses; differential-mode behaviour; analogue building blocks; fully balanced operational amplifiers

Subjects: Analogue circuit design, modelling and testing; Amplifiers; Network topology

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