Author

# P.V. Ananda Mohan

Bio: P.V. Ananda Mohan is an academic researcher from Concordia University Wisconsin. The author has contributed to research in topics: Switched capacitor & Prototype filter. The author has an hindex of 4, co-authored 15 publications receiving 96 citations.

##### Papers

More filters

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01 Jun 1995

TL;DR: In this article, the authors present a detailed analysis of the Switched-Capacitor Ladder Filters based on Impedence Simulation and on Multiloop Feedback Concepts.

Abstract: MOS Technology and Sampled Data Filters. Analysis of Switched-Capacitor Networks. Passive Switched-Capacitor Networks. First-Order Active Switched-Capacitor Networks. Second-Order Active SC Filters. Switched-Capacitor Ladder Filters Based on Impedence Simulation. SC Filters Based on Operational Simulation of LC Ladders and on Multiloop Feedback Concepts. Switched-Capacitor N-Path Filters. Practical Considerations in the Design of Switched-Capacitor Networks and Their Applications. Appendices.

47 citations

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TL;DR: In this article, the active R realisation of bandpass and lowpass filters using lossy simulated inductors and capacitors is described. But the authors do not consider the use of capacitors.

Abstract: Active R realisation of bandpass and lowpass filters using lossy simulated inductors and capacitors is described.

12 citations

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TL;DR: A general first-order switched-capacitor network using one operational amplifier, insensitive to stray capacitances, is proposed and its application to realise an inverting bilinear lossy integrator and a circuit for realising finite zeros is discussed.

Abstract: A general first-order switched-capacitor network using one operational amplifier, insensitive to stray capacitances, is proposed. Its application to realise an inverting bilinear lossy integrator and a circuit for realising finite zeros is discussed.

12 citations

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TL;DR: A new stray-insensitive SC bandpass filter derived from Moschytz's modified Tarmy-Ghausi configuration is described, comparing it with the Fleischer-Laker biquad.

Abstract: A new stray-insensitive SC bandpass filter derived from Moschytz's modified Tarmy-Ghausi configuration is described. Design equations and comparison with the Fleischer-Laker biquad are presented.

6 citations

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01 Apr 1984TL;DR: An active RC filter capable of realising a general biquadratic transfer function, using two operational amplifiers with grounded noninverting inputs, and its application to the realisation of SC filters using 'p-transformation' is discussed.

Abstract: An active RC filter capable of realising a general biquadratic transfer function, using two operational amplifiers with grounded noninverting inputs, is described. Its application to the realisation of SC filters using 'p-transformation' is also discussed.

5 citations

##### Cited by

More filters

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TL;DR: A design methodology for synthesis of active N-path bandpass filters is introduced and a 0.1-to-1.2 GHz tunable 6th-order N- path channel-select filter in 65 nm LP CMOS is introduced, achieving a “flat” passband shape and high out-of-band linearity.

Abstract: A design methodology for synthesis of active N-path bandpass filters is introduced. Based on this methodology, a 0.1-to-1.2 GHz tunable 6th-order N-path channel-select filter in 65 nm LP CMOS is introduced. It is based on coupling N-path filters with gyrators, achieving a “flat” passband shape and high out-of-band linearity. A Miller compensation method is utilized to considerably improve the passband shape of the filter. The filter has 2.8 dB NF, +25 dB gain, +26 dBm wideband IIP3 ( MHz), an out-of-band 1 dB blocker compression point B1dB,CP of +7 dBm (Δf = +50 MHz) and 59 dB stopband rejection. The analog and digital part of the filter draw 11.7 mA and 3-36 mA from 1.2 V, respectively. The LO leakage to the input port of the filter is ≤-64 dBm at a clock frequency of 1 GHz. The proposed filter only consists of inverters, switches and capacitors and therefore it is friendly with process scaling.

156 citations

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TL;DR: A widely tunable 4th order BPF based on the subtraction of two 2nd order 4-path passive-mixer filters with slightly different center frequencies is proposed.

Abstract: A widely tunable 4th order BPF based on the subtraction of two 2nd order 4-path passive-mixer filters with slightly different center frequencies is proposed. The center frequency of each 4-path filter is slightly shifted relative to its clock frequency (one upward and the other one downward) by agm-C technique. Capacitive splitting of the input signal is used to reduce the mutual loading of the two 4-path BPFs and increase their quality factors. The filter is tunable from 0.4 GHz to 1.2 GHz with approximately constant bandwidth of 21 MHz. The in-band 1-dB compression point of the filter is -4.4 dBm while the in-band IIP3 of the filter is +9 dBm and the out-of-band IIP3 is + 29 dBm (Δf=+50 MHz). The ultimate rejection of the filter is >; 55 dB and the NF of the filter is 10 dB. The static and dynamic current consumption of the filter are 2.8 mA from 2.5 V and 12 mA from 1.2 V, respectively (at 1 GHz). The LO leakage power to the input port is <; - 60 dBm. The filter has been fabricated in CMOS LP 65 nm technology and the active area is 0.127 mm2.

131 citations

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Hitachi

^{1}TL;DR: In this paper, a switched-capacitor filter constituted in the form of a semiconductor integrated circuit has an input circuit which consists of at least one non-inversion-type switch and at least two inversion type switch.

Abstract: A switched-capacitor filter constituted in the form of a semiconductor integrated circuit has an input circuit which consists of at least one noninversion-type switched-capacitor and at least two inversion-type switched-capacitors that are connected in parallel with each other. The two inversion-type switched-capacitors have different writing timings and reading timings relative to each other. With this setup, capacitances of the switched-capacitors need not be extremely increased even when it is desired to maintain a zero-point frequency of the filter at a very low value. Further, there is no need of providing a circuit such as sample holding circuit which requires extra area and consumes additional electric power.

69 citations

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TL;DR: This work analyzes several examples of switched linear circuits and a switched spring-mass system to illustrate the physical manifestations of regressivity and nonregressivity for discrete and continuous time systems as well as hybrid discrete/continuous systems from a time scales perspective.

53 citations

01 Mar 1980

TL;DR: The frequency axes of the two filters are mapped into each other by the bilinear s{\leftrightarrow}z transformation; this results in advantageous sensitivity and selectivity properties for the resulting switched-capacitor circuit.

Abstract: The low sensitivity of a doubly loaded reactance ladder to element-value variations is preserved in a switched-capacitor filter with the same graph if a one-to-one replacement of branch impedances is used to derive the switched filter from the reactance ladder. This paper describes the design principles and some novel circuits based on this approach. The frequency axes of the two filters are mapped into each other by the bilinear s{\leftrightarrow}z transformation; this results in advantageous sensitivity and selectivity properties for the resulting switched-capacitor circuit. In addition, the number of active components is equal to the number of inductors replaced, and is hence small. This results in very economical realization for the integrated filter.

48 citations