Temperature-compensated power sensing circuit for power amplifiers
First Claim
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.
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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.
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Citations
10 Claims
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1. A power sensing circuit for sensing radio frequency (RF) signals, comprising:
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a first transistor to perform as a detector diode, including i) 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, 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 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 Dependent Claims (2, 3, 4, 5)
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6. A power sensing circuit for sensing radio frequency (RF) signals, comprising:
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a) a first transistor to perform as a detector diode, including 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, including; 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 diode coupled between the regulated DC source and the second collector. - View Dependent Claims (8, 9, 10)
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7. The circuit of claimed 6, further comprising a capacitor coupled to the first collector and the second base.
Specification