A ratio-independent algorithmic analog-to-digital converter combining current mode and dynamic techniques

Nairn, D.G.; Salama, C.A.T.

doi:10.1109/31.52725

Cited by 72 publications

(34 citation statements)

References 23 publications

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“…Reducing random errors implies using larger transistor sizes. Reducing systematic errors implies using more elaborate current mirror topologies that either reduce their output conductance (using cascode [15], regulated cascode [16], or gain-boosting [17] techniques), decrease their input impedance [18], or both [19]. The application we had in mind when we developed this circuit was a WTA for a multichip real time clustering system [11].…”

Section: Resultsmentioning

confidence: 99%

A High-Precision Current-Mode WTA-MAX Circuit with Multi-Chip Capability

Serrano-Gotarredona

Linares-Barranco

Andreou

1998

Adaptive Resonance Theory Microchips

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Abstract-This paper presents a circuit design technique suitable for the realization of winner-take-all (WTA), maximum (MAX), looser-take-all (LTA), and minimum (MIN) circuits. The technique presented is based on current replication and comparison. Traditional techniques rely on the matching of an N transistors array, where N is the number of system inputs. This implies that when N increases, as the size of the circuit and the distance between transistors will also increase, transistor matching degradation and loss of precision in the overall system performance will result. Furthermore, when multichip systems are required, the transistor matching is even worse and performance is drastically degraded. The technique presented in this paper does not rely on the proper matching of N transistors, but on the precise replication and comparison of currents. This can be performed by current mirrors with a limited number of outputs.Thus, N can increase without degrading the precision, even if the system is distributed among several chips. Also, the different chips constituting the system can be of different foundries without degrading the overall system precision. Experimental results that attest these facts are presented.

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Section: Resultsmentioning

confidence: 99%

A High-Precision Current-Mode WTA-MAX Circuit with Multi-Chip Capability

Serrano-Gotarredona

Linares-Barranco

Andreou

1998

Adaptive Resonance Theory Microchips

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“…3 [22]. It is obtained by simply cascading elementary 1-bit cells, and by properly terminating the last one with transistors MTa-MTb.…”

Section: B Current-mode Implementationmentioning

confidence: 99%

Current-mode A/D fuzzy converter

Giustolisi

Palumbo

Pennisi

2002

IEEE Trans. Fuzzy Syst.

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This paper presents a general architecture for an analog-to-digital (A/D) fuzzy converter which performs the A/D conversion and the fuzzification operation on the same functional block, through a programmable membership function. The solution uses as main blocks an A/D converter, a comparator, and some logic inverters and switches. It is characterized by good flexibility and programmability and, compared to conventional approaches, allows a significant amount of silicon area to be saved. The architecture proposed does not depend on the specific A/D converter adopted. However, low-voltage operation and reduced power dissipation as well as full compatibility with digital technologies can be achieved through the use of current-mode design techniques. A CMOS implementation is then proposed and nonidealities, limiting the resolution, are analytically evaluated in detail. Simulations based on a 0.35-m standard technology, which are in excellent agreement with the theoretical results, are also given.Index Terms-Analog-to-digital (A/D) conversion, CMOS analog integrated circuits, fuzzy logic, fuzzy systems, mixed analog-digital integrated circuits.

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“…We used a simple 3-transistor current mirror for the 2-output NMOS current mirror of each cell. However, we used active input current mirrors [5] for the N-output PMOS current mirror and for the extra NMOS assembling current mirrors [l], [2].…”

Section: Resultsmentioning

confidence: 99%

Experimental results on the current-mode WTA-MAX circuit with multi-chip capability

Serrano-Gotarredona

Linares-Barranco²

Proceedings of 1997 IEEE International Symposium on Circuits and Systems. Circuits and Systems in the Information Age ISCAS '97

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This paxer g e s e n t s experimental results on the current-mo e TA-MAX circuit with multi-chip capability presented recently 111, [2]. The circuit technique used is based on current replication, transport and comparison. Traditional techniques rely on the matching of an arra of N transistors, where N is the number of system inputs. $his im lies that when N increases, the size of the circuit and the %stance between transistors also increases, resulting in transistor matching degradation and loss of precision in the overall system performance. Furthermore, when multi-chip systems are required, the transistor matchin is even worse and erformance is drastically degradefi. The circuit presentetin this paper does not rely on the proper matching of N transistors, but on the precise re lication of currents, performed b current mirrors with a gmited number of outputs. Thus 3 can increase without degrading the precision, even if the system is distributed among several chips. Also, the different chips constituting the system can be of different foundries without de rading the overall system precision. Experimental res& are presented that attest these facts.

show abstract

A ratio-independent algorithmic analog-to-digital converter combining current mode and dynamic techniques

Cited by 72 publications

References 23 publications

A High-Precision Current-Mode WTA-MAX Circuit with Multi-Chip Capability

A High-Precision Current-Mode WTA-MAX Circuit with Multi-Chip Capability

Current-mode A/D fuzzy converter

Experimental results on the current-mode WTA-MAX circuit with multi-chip capability

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