Feed forward circuit
AssigneeRockwell International Corporation
InventorAndrew F. Folkmann
Life of this patent
Estimating the term…
Abstract
A feed forward circuit that can be used as an isolator or filter includes a first and a second directional coupler that, depending on the application, either splits an applied signal into two paths or combines the two paths to obtain an output signal. One path includes an electronically tunable band reject filter (or notch filter) which may be bypassed by a switch in the isolator application, and an inverting amplifier. The second path includes a delay line that compensates for the time delay of the signal in the first path due to the time delay of the inverting amplifier and electronically tunable band reject filter.
Claims15
An isolation circuit comprising:
- a first signal means having first, second and third terminals for providing at said first terminal a signal which is the sum of the signals on said second and third terminals;
- amplifier means for amplifying a signal on said second terminal and providing an amplified output;
- and
- second signal means having fourth, fifth and sixth terminals for providing a signal on said sixth terminal which is the difference between a signal on said fourth and fifth terminals, said third terminal being coupled to said fourth terminal and said fifth terminal being coupled to receive said amplified output.
An isolation circuit comprising:
- a first signal means having first, second and third terminals for providing a signal on said first terminal which is the sum of signals on said second and third terminals;
- inverting amplifying means for amplifying a signal on said second terminal and providing an inverted amplified output;
- and
- a second signal means having fourth, fifth and sixth terminals for providing a signal at said sixth terminal which is the summation of signals at said fourth and fifth terminals, said third terminal being coupled to said fourth terminal and said fifth terminal being coupled to receive said inverted amplified output.
A feedforward system comprising:
- a first signal means having first, second and third terminals for providing at said first terminal a signal which is the sum of the signals on said second and third terminals;
- a band reject filter having an input coupled to said second terminal and providing a filtered output;
- means for amplifying said filtered output;
- and
- second signal means having fourth, fifth and sixth terminals for providing a signal on said sixth terminal which is the difference between a signal on said fourth and fifth terminals, said third terminal being coupled to said fourth terminal and said fifth terminal being coupled to receive the amplified filtered output.
A feedforward system comprising:
- a first signal means having first, second and third terminals and providing a signal on said first terminal which is the sum of signals on said second and third terminals;
- a band reject filter having an input coupled to said second terminal and providing a filtered output;
- inverting amplifying means for amplifying and inverting said filtered output;
- a second signal means having fourth, fifth and sixth terminals for providing a signal on said sixth terminal which is the summation of signals on said fourth and fifth terminals, said third terminal being coupled to said fourth terminal and said fifth terminal being coupled to receive the inverted amplified filtered output.
Dependencies are inferred from the claim text.