A novel high gain, high bandwidth CMOS differential front-end for wireless optical systems

Vasconcelos, E. de; Cura, J.L.; Aguiar, Rui L.; Santos, D.

doi:10.1109/iscas.1999.780034

Cited by 9 publications

(4 citation statements)

References 5 publications

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“…A number of applications, such as filters, oscillators, analog-digital converter, and analogue signal processing blocks based on current conveyors have been proposed [2][3][4]. Recently, current-mode circuits are well used in communication circuits and wireless optical systems due to their larger dynamic range and wider bandwidth [5][6].…”

Section: Introductionmentioning

confidence: 99%

Versatile Voltage-Mode Universal Filter Using Differential Difference Current Conveyor

Maheshwari¹,

Gangwar²

2011

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A novel four-input three-output voltage-mode differential difference current conveyor (DDCC) based universal filter is presented. The circuit uses three DDCCs as active elements, two resistors and two capacitors as passive elements. The circuit along with its versatility enjoys the advantage of minimum number of passive elements employment. SPICE simulation results are given to confirm the theoretical analysis. The proposed circuit is a novel addition to the existing knowledge on the subject.

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Section: Introductionmentioning

confidence: 99%

Versatile Voltage-Mode Universal Filter Using Differential Difference Current Conveyor

Maheshwari¹,

Gangwar²

2011

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“…Decreasing the amplifier input impedance seems to be a necessary step to increase bandwidth in systems with low cost optical sensors. The product of the PD (large) intrinsic capacitance and the (traditionally large) front-end input impedance establishes a dominant pole in most optical transimpedance front-ends [5]. As the PD is generally defined by global system requirements, it becomes crucial minimizing this front-end input impedance.…”

Section: Introductionmentioning

confidence: 99%

Untitled

Alves

Aguiar

Santos

2002

Analog Integrated Circuits and Signal Processing

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Abstract. This paper discusses bandwidth problems associated with second-generation current conveyors (CCII). In particular, our work is centered in high-capacitance applications, and has been oriented for wireless optical links and applied physics. We discuss techniques for improving bandwidth in these CCIIs, and develop a new CCII structure with larger bandwidth than traditional circuits. These circuits are then compared in terms of their noise and dynamic range characteristics. A test circuit was developed to verify these different bandwidth behaviors.

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“…The three stages are DC coupled to avoid baseline shift with signal input. Additionally a control block is added for gain switching purposes, with small variations of the circuit described in [4]. Electromagnetic interference is a major system issue for the desired gain values.…”

Section: Optical Front-endmentioning

confidence: 99%

“…For its minimization, the circuit has a differential input, to which low cost photodiodes (10 pF to 50 pF junction capacitance) will be connected in the targeted wireless system. Thus, for noise minimization considerations the transimpedance amplifier also presents an input stage with an equivalent 10 pF capacitance [4]. Input referred current noise was under 8.2 pA/√Hz.…”

Section: Optical Front-endmentioning

confidence: 99%