Feedforward circuit structure with programmable zeros for provid

Details Feedforward circuit structure with programmable zeros for provid Feedforward circuit structure with programmable zeros for provid

1998-12-23

2000-10-03

Nuton, My-Trang

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Having specific delay in producing output waveform

327287, H03H 1126

Patent

active

061278734

ABSTRACT:
A feedforward circuit structure with programmable zeros for synthesizing continuous-time filters, delay lines, and the like is described. The circuit comprises a first cell and a second cell which are cascade-connected. Each one of the first and second cells comprises first and second pairs of bipolar transistors. The emitter terminals of the first pair of transistors are connected to a first current source, and the emitter terminals of the second pair of transistors are connected to a second current source. A first high-impedance element is connected between the first and second pairs of transistors, and a second high-impedance element is connected at an output of the second pair of transistors. A fifth transistor is connected between the collector terminal of a first transistor of the first pair of transistors and the collector terminal of a second transistor of the second pair of transistors. The base terminal of the fifth transistor receives a signal which is taken from the collector terminal of the first transistor of the first pair of transistors, with the signal being taken with a positive sign in the first cell and with a negative sign in the second cell, in order to determine a transfer function with a pair of singularities at the numerator. The second transistors of the first and second pairs of transistors are controlled respectively by third and fourth current sources which have mutually different values.

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Vainio, Olli, and Seppo J. Ovaska, "A Class of Active-RC Filters with Predictive Characteristics," IEEE, Apr. 1995, pp. 358-363.

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