Tunable filter network having DC accuracy

Details Tunable filter network having DC accuracy Tunable filter network having DC accuracy

1993-06-09

1995-06-20

Wambach, Margaret Rose

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Unwanted signal suppression

327 67, 327 73, 327311, H03K 522, H03K 5153

Patent

active

054263930

ABSTRACT:
A highly DC accurate filter network capable of implementing a transfer function of arbitrary complexity is disclosed herein. The filter network includes a differential integration and summation network having a first input port connected to an input terminal of the filter network, a second input port, and an output port. A filter circuit having a predefined transfer function is connected between the output port and an output terminal of the filter network. In addition, a feedback path connects the output terminal to the second input port of the differential integration and summation network. During operation of the filter network the filter circuit cooperates with the differential integration and summation network so as not to affect the amplitude of the DC component of an input signal applied to the input terminal. This results in high DC accuracy even if the filter circuit is implemented using, for example, active components. Moreover, the overall transfer characteristic of the filter remains highly DC accurate even when filter circuits having adjustable transfer characteristics, such as clock-tunable switched capacitor filters, are incorporated therein.

REFERENCES:
patent: 5331222 (1994-07-01), Lin et al.
Linear Technology Corporation; Initial Release "LT1211/1212 (14MHz, 7V/.mu., Single Supply Dual and Quad Precision Op Amps)"; Jan. 1993; pp. 1-8.

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