Very Low Voltage MOS Translinear Loops Based on Flipped Voltage Followers

Circuits Syst Signal Process

2007

A technique for designing square-root domain elliptic filters that simulate the operation of the corresponding LC ladder prototypes is introduced in this paper. This is achieved by manipulating the equations that describe the operation of differentiation in such a way that only lossless integrator and weighted summation blocks are needed. The derived signal flow graph (SFG) is transposed to the corresponding one in the squareroot domain using an appropriate set of operators in order to preserve the linear operation of the whole filter. In order to demonstrate the validity of the proposed technique, a thirdorder elliptic lowpass filter was simulated and its behavior was evaluated using an HSPICE simulator.

Section: √ X-domain Building Blocksmentioning

confidence: 71%

Section: √ X-domain Building Blocksmentioning

confidence: 99%

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Square-Root Domain Operational Simulation of LC Ladder Elliptic Filters

Circuits Syst Signal Process

2007

“…A single power supply voltage V DD = 1.5 V is employed for biasing all the stages of the filter, while the dc current I o is chosen to be equal to 5 A. The FVFs used in geometric-mean and squarer/divider blocks [26] are biased at a dc current I B = 2 A, while the dc voltage V B has chosen to be equal to 0.8 V. Considering transistors models for the AMS 0.35 m S35 process, the MOS transistor aspect ratios for geometric-mean and squarer/divider blocks are summarized Tables II and III, respectively. The aspect ratios of nMOS transistors employed in integration, summation, and compression/expansion blocks were chosen to be 1.3/2 m. Thus, according to the formula R = 1/ √ 2K I o , the port resistance has a value equal to 34.48 k .…”

Section: Simulation Resultsmentioning

confidence: 99%

Square‐root domain linear transformation filters

Stoumpou

2011

Circuit Theory & Apps

SUMMARYA new systematic method for designing square-root domain (SRD) linear transformation (LT) filter is introduced in this paper. For this purpose, a substitution table containing the SRD LT equivalent of each passive element has been introduced. The proposed equivalents have been realized by employing appropriate SRD building blocks with low-voltage operation capability. As a design example, a 3rd-order SRD LT filter has been realized and its performance has been evaluated through simulation results. In addition, the most important performance factors of the SRD filter have been compared with those achieved by the SRD filters derived according to the leapfrog, wave, and topological emulation methods.

“…According to this, the geometric mean and squarer/divider blocks are given in Figures 11 and 12. An attractive characteristic of these topologies is their capability for very low-voltage operation [30,31]. In both configurations, the second-order translinear loops are established by the transistors Mn1-Mn4, while the employed FVFs are formed by the transistors Mn5, Mn7, and the dc current source I B .…”

Section: Srd Integrator Blocksmentioning

confidence: 99%

Design of square‐root domain filters by substituting the passive elements of the prototype filter by their equivalents

2007

Circuit Theory & Apps

SUMMARYA novel technique for designing square-root domain (SRD) filters is introduced in this paper. The concept of the proposed method is based on the substitution of the passive elements of the corresponding prototype filter by their SRD equivalents. The signal processing performed by the proposed SRD equivalents achieves that the voltage at each terminal of the SRD equivalent is the compressed version of the voltage at the corresponding terminal of the passive element, and that the current that flows through the SRD equivalent is the same as that flows through the passive element. The main attractive characteristic of the proposed method is that a quick procedure for designing SRD filters is offered. The validity of the proposed technique was verified by studying the behaviour of a 5th-order SRD low-pass filter. In order to demonstrate the benefits offered by the proposed technique, a SRD leapfrog filter was also designed and its performance is compared with that of the active filter that topologically simulates the same prototype filter.