×

Temperature-compensated power sensing circuit for power amplifiers

  • US 7,071,783 B2
  • Filed: 09/10/2004
  • Issued: 07/04/2006
  • Est. Priority Date: 07/19/2002
  • Status: Active Grant
First Claim
Patent Images

1. A power sensing circuit for sensing radio frequency (RF) signals, comprising:

  • a first transistor to perform as a detector diode, includingi) a first base to receive a radio frequency input signal a DC bias signal from a regulated DC source coupled through a resistor, and a power-sensing signal; and

    ii) a first collector connected to the first base;

    b) a second transistor to amplify the DC component of the RF signal from the first base, includingi) a second base connected to the first base through a low-pass filter; and

    ii) a second collector to output the power-sensing signal to be coupled to the regulated DC source through a resistor, said power-sensing signal being substantially proportional to the strength of the radio frequency input signal; and

    c) an output port coupled to the second collector through a low-pass filter, to output the power-sensing signal and a capacitor coupled to the first collector and the second base.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×