Amplifiers – With amplifier bypass means
Patent
1991-11-25
1992-09-15
Mottola, Steven
Amplifiers
With amplifier bypass means
330149, H03F 132
Patent
active
051481170
ABSTRACT:
An adaptive feed-forward cancelling system obtains a reference signal and a sample signal from an amplifier by directional couplers. The sample signal essentially consists of an undistorted input signal component and a noise and distortion component. The reference and sample signals are provided to an adaptive interference canceller which performs an adaptive cancellation process. The interference canceller provides a cancellation signal essentially consisting of the signal component which is common to both the reference signal and the sample signal. The cancellation signal is injected into a transmission line which carries the sample signal so that only an error signal remains which essentially consists of the noise distortion component of the amplifier output signal. The error signal is then amplitude and phase adjusted to have substantially the same amplitude and to be substantially 180.degree. out of phase with the amplifier output signal. The amplitude and phase adjustment error signal is then injected by a directional coupler onto the transmission line which carries the amplifier output signal so that an amplified input signal is provided by the power amplifier without the noise and distortion components added by the amplifier.
REFERENCES:
patent: 3699444 (1972-10-01), Ghose
patent: 4389618 (1983-06-01), Baumann
patent: 5077532 (1991-12-01), Obermann et al.
An HF Dynamic Range Amplifier Using Feedforward Techniques, published in RF Design Magazine, Jul. 1987, pp. 50-59, authored by Jean Yamas.
Antenna Spacing Considerations In An Interference Canceller, by Ashok K. Talwar, published in IEEE Transactions On Broadcasting, vol. 36, No. 3, pp. 203-206, Sep. 1990.
Collocation Of Receivers And High-Power Broadcast Transmitters, by Rabindra Ghose, published in IEEE Transactions On Broadcasting, vol. 34, No. 2, Jun. 1988.
American Nucleonics Corporation
Mottola Steven
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