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Quadrature modulator and calibration method

  • US 7,893,758 B2
  • Filed: 06/15/2009
  • Issued: 02/22/2011
  • Est. Priority Date: 04/24/2003
  • Status: Expired due to Term
First Claim
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1. A synchronous envelope detector, comprising:

  • a) a Gilbert cell having at least one differential transistor pair in an upper tree and at least one transistor in a lower tree, the upper and lower trees interconnected and each of the upper and lower branches having input terminals;

    b) a resistor divider network connected between the input terminals of the upper tree and the input terminals of the lower tree, the resistive values of the network selected such that a selected input signal having a signal level sufficient to saturate the at least one transistor pair of the upper tree is attenuated so as to not saturate the at least one transistor pair of the lower tree; and

    c) a low pass filter connected to the upper tree, with an output signal of the detector provided to the low pass filter.

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