Cmos Arithmetic Circuits
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The document discusses various digital circuit techniques for arithmetic operations like addition and multiplication. It covers binary adders, full adders, ripple carry adders, carry lookahead adders, carry save adders, array multipliers, Wallace tree multipliers, and other basic datapath elements. The document also discusses design considerations like transistor count, critical path, performance, power, and layout strategies.
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Design of a High Speed, Rail-to-Rail input CMOS comparator
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High Speed Carryselect Adder
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Ofdma 1
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Area-Delay Efficient Binary Adders in QCAIJERA Editor In this paper, a novel quantum-dot cellular automata (QCA) adder design is presented that decrease the number
of QCA cells compared to previously method designs. The proposed one-bit QCA adder is based on a new
algorithm that requires only three majority gates and two inverters for the QCA addition. A novel 128-bit adder
designed in QCA was implemented. It achieved speed performances higher than all the existing. QCA adders,
with an area requirement comparable with the low RCA and CFA established. The novel adder operates in the
RCA functional, but it could propagate a carry signal through a number of cascaded MGs significantly lower
than conventional RCA adders. In adding together, because of the adopted basic logic and layout strategy, the
number of clock cycles required for completing the explanation was limited. As transistors reduce in size more
and more of them can be accommodated in a single die, thus increasing chip computational capabilities.
However, transistors cannot find much smaller than their current size. The quantum-dot cellular automata
approach represents one of the possible solutions in overcome this physical limit, even though the design of
logic modules in QCA is not forever straightforward.
4 bit manchester_adder
4 bit manchester_addertejaswinimedishetti This document presents the design of a 4-bit Manchester adder. It includes:
1) Circuit designs for the components of the adder including a C-chain, XNOR gate, and 1-bit adder. Simulations show the designs function correctly.
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3) Worst case testing to measure propagation delay, where all inputs are set to maximize delay. Simulations show the delay meets specifications.
Parte2 clase04 adc dca
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1) The characteristics of analog to digital converters including quantization error, linearity errors, offset and gain errors, and differential nonlinearity.
2) Measurement techniques for analyzing static characteristics such as code boundary testing and histogram testing.
3) Dynamic performance metrics including quantization noise, signal to noise ratio, and effective number of bits.
4) Different architectures for analog to digital converters including flash, folding, subranging, pipeline, successive approximation, dual slope, and delta-sigma converters.
5) Digital to analog converter design including resistor scaling, R2R ladders, and charge redistribution techniques.
200 m hz flash adc
200 m hz flash adcVũ Đình This summarizes a document describing a 6-bit 200MHz flash analog-to-digital converter (ADC) with redundancy. It uses small latched comparators and redundancy to reduce offset errors. Simulations show it achieves 5.3 effective number of bits, consumes 1.56mW of power, and has a figure of merit of 0.2 pJ/conversion step, making it suitable for applications requiring low power consumption. Redundancy allows selecting the closest comparator to the ideal threshold for each level, reducing offset effects.
Interconnection mechanisms
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IRJET- Comparison of Multiplier Design with Various Full Adders
IRJET- Comparison of Multiplier Design with Various Full AddersIRJET Journal This document compares the design of 4x4 array and Wallace tree multipliers using different full adders. It analyzes the power consumption, area, and delay of multipliers built with conventional, transmission function, transistor-based, and hybrid (12-transistor) full adders. Simulation results show the hybrid full adder achieves the lowest power consumption of 0.8946mW for the Wallace tree multiplier, demonstrating its benefit for building low power multipliers. In conclusion, replacing existing full adders in multipliers with the proposed hybrid full adder reduces area, power consumption, and transient time.
TINET_FRnOG_2008_public
TINET_FRnOG_2008_publicDavide Cherubini - The document discusses methods for estimating traffic matrices, which describe the flow of traffic between origin-destination pairs in a network.
- Early methods relied on direct measurements, which are computationally intensive. Recent approaches use inference based on link measurements and routing information.
- Current research looks at techniques like principal component analysis, Kalman filtering, and incorporating additional data like access link measurements to improve estimates while reducing measurement needs. Hybrid methods combining analysis and some direct measurements are also promising.
3BITFLASHADC
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Design and Hardware Implementation of Low-Complexity Multiuser Precoders (ETH...
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Cmos Arithmetic Circuits
- 3. Datapath circuit techniques for adders
- 4. Binary adder
- 5. Binary adder
- 6. Special trick for reducing No of transistor Cout = AB + C IN .(A + B) SUM = ABC CN + C ’ OUT (A + B + CIN) The advantage of these type realization is that transistor count is less as compared to earlier realization using expression of slide 5.
- 8. Mirror Adders As discussed is class, Mirror adder circuit is having symmetrical N block and P block.
- 10. Pipelined adder
- 13. Linear carry select adder
- 14. Linear carry select adder: critical path
- 16. Carry look-ahead circuit structures
- 17. Carry save (CSA) and carry propagate (CPA) adders
- 18. Adder delays
- 20. Datapath circuit techniques for multipliers
- 24. Array multiplier
- 25. MxN array multiplier critical path
- 26. Carry ripple vs. carry save array multiplier
- 28. Adder cells in array multiplier
- 36. Parallel vs. serial multipliers
- 37. Parallel vs. serial multipliers
- 42. Binary shifter
- 43. Barrel shifter
- 46. Power considerations in datapath structures
- 49. Architecture trade-offs: reference datapath
- 53. Glitching in NOR chain
- 54. Glitching in RCA
- 55. Switching activity in adders
- 56. Switching activity in multipliers
- 57. Layout strategy for datapath
- 58. Layout strategy for datapaths
- 59. Cell area: 2 vs. 3 metal layer process
- 60. Summary