Accurate power sensing circuit for power amplifiers
First Claim
1. An amplifier circuit for amplifying radio frequency signals having temperature compensation and bias compensation, comprising:
- a) a radio frequency power amplifier to receive an input radio frequency signal and to output an amplified radio frequency signal;
b) a first transistor to perform as a detector diode, including i) a first base to receive the amplified radio frequency signal, a second DC bias input signal from a regulated DC source, and a third power-sensing signal; and
ii) a first collector connected to the first base; and
c) a second transistor to amplify the DC component of the RF signal from the first base, including i) a second base coupled to the first base; and
ii) a second collector to output the power-sensing signal, said power-sensing signal being coupled to the regulated DC source through a resistor.
2 Assignments
0 Petitions
Accused Products
Abstract
An amplifier circuit for amplifying radio frequency signals having temperature compensation and bias compensation includes a radio frequency power amplifier that receives an input radio frequency signal and outputs an amplified radio frequency signal, and a first transistor performing as a detector diode with its collector and base connected. The base of the first transistor receives the amplified radio frequency signal from the power amplifier, a second DC bias input signal from a regulated DC source, and a third power-sensing signal. The amplifier circuit further includes a second transistor to amplify the DC component of the RF signal from the base of the first transistor. The base of the second transistor is coupled to the base of the first transistor. The collector of the second transistor outputs the power-sensing signal, which is coupled to the regulated DC source through a resistor.
36 Citations
17 Claims
-
1. An amplifier circuit for amplifying radio frequency signals having temperature compensation and bias compensation, comprising:
-
a) a radio frequency power amplifier to receive an input radio frequency signal and to output an amplified radio frequency signal;
b) a first transistor to perform as a detector diode, including i) a first base to receive the amplified radio frequency signal, a second DC bias input signal from a regulated DC source, and a third power-sensing signal; and
ii) a first collector connected to the first base; and
c) a second transistor to amplify the DC component of the RF signal from the first base, including i) a second base coupled to the first base; and
ii) a second collector to output the power-sensing signal, said power-sensing signal being coupled to the regulated DC source through a resistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. A power sensing circuit for sensing radio frequency signals, comprising:
-
a) a first transistor to perform as a detector diode, including i) a first base to receive a first radio frequency input signal output, a second DC bias input signal from a regulated DC source, and a third power-sensing signal; and
ii) a first collector connected to the first base; and
b) a second transistor to amplify the DC component of the RF signal from the first base, including i) a second base coupled to the first base; and
ii) a second collector to output the power-sensing signal, said power-sensing signal being coupled to the regulated DC source through a resistor. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A power sensing circuit for sensing radio frequency signals, comprising:
-
a) a first transistor to perform as a detector diode, including i) a first base to receive a first radio frequency input signal output, a second DC bias signal from a regulated DC source coupled through a resistor, and a third 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, including i) 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 first 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.
-
Specification