Amplifiers – With pilot frequency control means
Patent
1996-07-26
1998-06-23
Mottola, Steven
Amplifiers
With pilot frequency control means
330149, 330151, H03F 366, H03F 126
Patent
active
057709718
ABSTRACT:
A control arrangement and method for controlling a gain and phase adjuster used for controlling the gain and phase of a compensation signal for compensating for the distortion produced by a power amplifier is disclosed. The control arrangement makes use of a reference signal, of known frequency, which is amplified along with the desired carrier signals. The reference signal component of the amplified signal is then isolated and a comparison is made, either with the actual reference signal, e.g., by a QAM demodulator, or alternatively with the known frequency of the reference signal, e.g., by a FM discriminator, in order to determine the differences in gain and in phase of the reference signal component of the amplified signal in comparison with the reference signal. For example, a QAM demodulator is used for producing a first difference signal indicative of the phase switch difference, and a second difference signal indicative of the gain switch difference. These signals are then correlated with the signal envelope of the main signal in order to produce signals indicative of the sign and magnitude of the control signals used to adjust the gain and phase adjuster in a feed back loop.
REFERENCES:
patent: 4879519 (1989-11-01), Myer
patent: 4885551 (1989-12-01), Myer
patent: 5155448 (1992-10-01), Powell
patent: 5193224 (1993-03-01), McNicol et al.
patent: 5508657 (1996-04-01), Behan
patent: 5621354 (1997-04-01), Mitzlaff
Measures Jeffrey M.
Mottola Steven
Northern Telecom Limited
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