×

Switchable up-conversion loop for a transmitting stage of a mobile phone

  • US 6,470,191 B1
  • Filed: 10/29/1999
  • Issued: 10/22/2002
  • Est. Priority Date: 11/06/1998
  • Status: Expired due to Term
First Claim
Patent Images

1. A switchable up-conversion loop device for a transmitting stage of a mobile phone having multiple transmit frequency bands, said up-conversion loop device comprising:

  • a phase detector (21) generating a phase detector output signal in response to a phase difference between an input signal and a mixing product signal, multiple switchable voltage controlled oscillators (35, 37;

    100, 101, 102;

    111, 112;

    120), each of said voltage controlled oscillators being connected to the phase detector (21) via a low pass filter (32) for generating an output oscillating signal at a frequency which depends on the phase detector output signal, and coupling means (44;

    110;

    119;

    121) for coupling the output oscillating signal to a mixer (26) for mixing said output oscillating signal with a locally generated oscillating signal to produce said mixing product signal.

View all claims
  • 5 Assignments
Timeline View
Assignment View
    ×
    ×