Design and Analysis of Integrator-Based Log-Domain Filter by Gordon W. Roberts

By Gordon W. Roberts

This identify bargains with the layout and research of log-domain filter out circuits. It describes synthesis tools for constructing bipolar or BiCMOS clear out circuits with cut-off frequencies starting from the low kilohertz variety to a number of hundred megahertz. a number of examples offer measured experimental info from IC prototypes.

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Extra info for Design and Analysis of Integrator-Based Log-Domain Filter (THE KLUWER INTERNATIONAL SERIES IN ENGINEERING AND)

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Using this approach, Frey has successfully demonstrated the design of a biquadratic log-domain filter, and a seventh-order Chebyshev filter as a cascade of several biquads. Additional results based on these findings were later published in references [23]-[28]. Subsequently, a 12 Design and Analysis of Integrator-Based Log-Domain Filter Circuits high-speed log-domain biquad formed entirely of npn transistors was developed and is reported in [17]. To simplify the filter synthesis and extend the approach to any order, Perry and Roberts developed the log-domain signal-flow-graph (SFG) approach [29]-[30].

Seeing that a log-domain filter is essentially a linear system realized with intrinsically non-linear (exponential) bipolar devices, we reviewed the Translinear 26 Design and Analysis of Integrator-Based Log-Domain Filter Circuits Principle, which is a time-proven circuit technique that explicitly employs the diode characteristics for signal processing. We believe our log-domain research can benefit from the vast knowledge already developed in this area. In particular, it has come to our attention that the voltage-programmable current mirror seems to be a natural candidate to relate signals between the linear- and the log-domains.

As such, bipolar transistors and capacitors are used to realize the transformed state-space equation on a term by term basis. ) Using this approach, Frey has successfully demonstrated the design of a biquadratic log-domain filter, and a seventh-order Chebyshev filter as a cascade of several biquads. Additional results based on these findings were later published in references [23]-[28]. Subsequently, a 12 Design and Analysis of Integrator-Based Log-Domain Filter Circuits high-speed log-domain biquad formed entirely of npn transistors was developed and is reported in [17].

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