Northrop Grumman Systems Corporation

Philippe Pouliquen

Bouchaib Cherif

Isidoros Doxas

The proposed dynamic current-mode finite impulse response (FIR) filter includes a coefficient signal generator to generate a coefficient signal, an input signal generator to generate an input signal, a dynamic current multiplier configured to receive the input signal and the coefficient signal and to generate intermediate product terms that are multiplications of the coefficient values and reflected and shifted input values, and an accumulator configured to receive the intermediate product terms and to sequentially integrate the intermediate product terms over the coefficient values to produce output responses for the input values. The dynamic current multiplier includes a first dynamically configured transistor (DCT) having a first input node to receive the first input signal during a first phase of operation and a second input node to receive the second input signal during a second phase of operation, and a second DCT having an input node to receive a third input signal during a first phase of operation, and output the intermediate product terms during a second phase of operation.

Dynamic current-mode finite impulse response filter

According to some other aspects of the present disclosure, an electrical circuit comprises a first capacitive element, a first transistor, a second capacitive element, and a second transistor. The circuit receives a first input current, a second input current, a third input current, and an input voltage. The circuit is configured to generate a first voltage by providing the input voltage and the first input current to the first transistor. The first voltage difference is the difference between the first voltage and the input voltage, and is logarithmically related to the first input current. The circuit may also be configured to store the first voltage as the first charged state of the first capacitive element. The circuit is further configured to generate a second voltage by providing the second input current and the first charged state of the first capacitive element to the first transistor. The second voltage difference is the difference between the first voltage and the second voltage, and is logarithmically related to the second input current. The circuit is additionally configured to generate a third voltage by providing the second voltage and the third input current to the second transistor. The third voltage difference is the difference between the third voltage and the second voltage, and is logarithmically related to the third input current. The circuit may also be configured to store the third voltage as the second charged state of the second capacitive element. The circuit is further configured to generate an output current by providing the input voltage and the second charged state of the second capacitive element to the second transistor. The output current is exponentially related to the fourth voltage difference, which is the difference between the third voltage and the input voltage. The output current is equivalent to a ratio of a product of the first and third input currents to the second input current.

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Baltimore, MD, United States of America

Philippe Pouliquen