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Arc-cosine phase modulators

  • US 4,095,196 A
  • Filed: 07/20/1977
  • Issued: 06/13/1978
  • Est. Priority Date: 07/20/1977
  • Status: Expired due to Term
First Claim
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1. A phase modulator responsive to an input signal and to a carrier signal comprising:

  • first means for developing a signal proportional to the inverse hyperbolic tangent of said input signal;

    second means, responsive to said first means and to said carrier signal for generating a signal which is proportional to a sum of two signals that are exponentially related to the output signal of said first means and which is amplitude modulated with said carrier signal; and

    third means for hard limiting the output signal of said second means.

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