Log-Domain Filters Based on LC Ladder Synthesis
نویسندگان
چکیده
A design method is proposed for the synthesis of linear, high-order, continuous-time filters using a unique translinear integrator circuit. Unlike previous attempts at incorporating translinear circuits into filter design, the proposed theory makes explicit use of the exponential nature of the bipolar transistor. This technique is based on the operational simulation of LC ladders. A 5th-order Chebyshev filter is designed, simulated and verified experimentally. The filter shows good amplitude response as well as distortion levels comparable to other filtering schemes.
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AbstractLog-domain filters are an intriguing form of current-mode circuits. They are universally regarded as externally-linear internally-nonlinear circuits in which each bipolar junction transistor operates in the forward-active mode at all times and acts as a static exponential non-linearity relating the collector current to the base-emitter voltage. This paper establishes sufficient conditi...
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