A dynamic current mode design approach of 2/3 prescaler for phase locked loop application

Author(s):  
Suraj Kumar Saw ◽  
Umakanta Nanda ◽  
Nivedita Laskar ◽  
Alak Majumder
2011 ◽  
Vol 2011 ◽  
pp. 1-10 ◽  
Author(s):  
N. A. Shah ◽  
F. A. Khanday

A generic design (GD) for realizing annth order log-domain multifunction filter (MFF), which can yield four possible stable filter configurations, each offering simultaneously lowpass (LP), highpass (HP), and bandpass (BP) frequency responses, is presented. The features of these filters are very simple, consisting of merely a few exponential transconductor cells and capacitors; all grounded elements, capable of absorbing the shunt parasitic capacitances, responses are electronically tuneable, and suitable for monolithic integration. Furthermore, being designed using log-domain technique, it offers all its advantages. As an example, 5th-order MFFs are designed in each case and their performances are evaluated through simulation. Lastly, a comparative study of the MFFs is also carried, which helps in selecting better high-order MFF for a given application.


1992 ◽  
Vol 27 (5) ◽  
pp. 701-713 ◽  
Author(s):  
B. Linares-Barranco ◽  
E. Sanchez-Sinencio ◽  
A. Rodriguez-Vazquez ◽  
J.L. Huertas

2008 ◽  
Vol 58 (3) ◽  
pp. 183-195 ◽  
Author(s):  
Chung-Yu Wu ◽  
Wen-Chieh Wang ◽  
Fadi R. Shahroury ◽  
Zue-Der Huang ◽  
Hao-Jie Zhan

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Eric Basham ◽  
David Parent

Neurons cultured directly over open-gate field-effect transistors result in a hybrid device, the neuron-FET. Neuron-FET amplifier circuits reported in the literature employ the neuron-FET transducer as a current-mode device in conjunction with a transimpedance amplifier. In this configuration, the transducer does not provide any signal gain, and characterization of the transducer out of the amplification circuit is required. Furthermore, the circuit requires a complex biasing scheme that must be retuned to compensate for drift. Here we present an alternative strategy based on thegm/Iddesign approach to optimize a single-stage common-source amplifier design. Thegm/Iddesign approach facilitates in circuit characterization of the neuron-FET and provides insight into approaches to improving the transistor process design for application as a neuron-FET transducer. Simulation data for a test case demonstrates optimization of the transistor design and significant increase in gain over a current mode implementation.


2010 ◽  
Vol 61 (1) ◽  
pp. 52-56 ◽  
Author(s):  
Roman Šotner ◽  
Josef Slezák ◽  
Tomáš Dostál ◽  
Jiří Petržela

Universal Tunable Current-Mode Biquad Employing Distributed Feedback Structure with MO-CCCIIOne possible application of the multiple-output electronically-tunable active building block as a universal filter with distributed feedback structure is presented. The suggested structure is less conventional than the well-known state-variable Kerwin-Huelsman-Newcomb but allows the same filter configurations with the similar properties. The major current-mode design approach disadvantage,ie, the necessity of multiple current outputs, is demonstrated. To date even a rather big line of the commercially available devices do not solve this problem. Some features of the active block used for modelling and transistor-level simulation are briefly discussed. The obvious chance for electronic tuning of the proposed filter is verified.


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