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Current mode phase shifter, mixer and amplifier

  • US 20070058703A1
  • Filed: 09/12/2005
  • Published: 03/15/2007
  • Est. Priority Date: 09/08/2005
  • Status: Active Grant
First Claim
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1. An integrated circuit radio transceiver, comprising:

  • a baseband processor operable to process ingoing digital communication signals and to produce outgoing digital communication signals;

    a transmitter front end operable to process and transmit outgoing RF signals based upon the outgoing digital communication signals;

    a receiver front end operable to receive ingoing RF signals and to process the ingoing RF signals to produce the ingoing digital communication signals to the baseband processor, wherein the receiver front end further includes a current mixing and amplification stage for generating an amplified frequency shifted output signal to at least a portion of one of the transmitter and receiver front ends, the current mixing and amplification stage further including;

    a current mixer operable to produce a frequency shifted output current signal based upon an oscillation and an input signal, the current mixer characterized by an output impedance; and

    an amplifier block operably disposed to produce an amplified signal based upon the frequency shifted output current signal, the amplifier block consisting of an amplifier with at least one feedback resistor wherein gain of the amplifier block is based substantially upon a product of a gain characteristic of the current mixer and a resistance value of the at least one feedback resistor and further wherein the at least one feedback resistor is coupled directly to an input of the amplifier and to a mixer output of the current mixer.

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