Methods and apparatus for modulating, demodulating and amplifyin

Details Methods and apparatus for modulating, demodulating and amplifyin Methods and apparatus for modulating, demodulating and amplifyin

1997-11-24

1999-08-17

Grimm, Siegfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

330 10, 330103, 329308, 329325, 331 2, 332127, H04L 2736, H04L 2738, H03F 132, H03L 707

Patent

active

059399511

ABSTRACT:
An apparatus is disclosed for processing an input signal. The apparatus includes two feedback loops for generating output signal components from the input signal. Each loop contains an oscillator, which has a frequency or phase which is variable in response to a control signal, and a comparator for generating the control signal. The oscillator generates a loop output signal which forms one of the components of the output signal. The apparatus also includes a combiner for combining the loop output signals to produce the output signal. For each loop, the apparatus also produces a feedback loop operating signal, these signals being dependent on the output signal and in phase quadrature with one another. One input of the comparator in each loop receives the feedback loop operating signal, and the other input of the comparator receives a component of the input signal. The apparatus also continuously ensures that the output signal is stable whatever the phase of the output signal relative to that of the input signal.

REFERENCES:
patent: 5105168 (1992-04-01), DaSilva
patent: 5381108 (1995-01-01), Whitmarsh et al.
patent: 5469105 (1995-11-01), Sparks

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