Amplifier module
An amplifier module includes a magnitude detector configured to detect a magnitude of a reflection coefficient, and a phase detector configured to detect a phase of the reflection coefficient The magnitude detector includes an incident signal amplifier configured to amplify an incident signal, an output level controller configured control a level of an output of the incident signal amplifier, a reflected signal amplifier configured to amplify a reflected signal, and a comparator configured to compare an output of the incident signal amplifier with an output of the reflected signal amplifier to output a comparison result indicating whether the magnitude of the reflection coefficient is equal to or greater than a threshold determined based on the control signal.
1. A phase detector for use in an RF device for detecting a phase of a reflection coefficient, comprising:
a first subtractor configured to output a phase reference voltage, the first subtractor comprising a non-inverting terminal configured to receive an incident signal and an inverting terminal connected to a ground node;
a control unit configured to generate a phase-shift control signal;
a phase shifter configured to output a reflected signal based on the phase-shift control signal, or to output a phase-shifted reflected signal by shifting a phase of the reflected signal based on the phase-shift control signal;
a second subtractor configured to output a phase comparison voltage by using a difference between the incident signal and an output of the phase shifter; and
a comparator configured to output a comparison result by comparing the phase reference voltage with the phase comparison voltage, the control unit being configured to: obtain a first comparison result of the comparator when the phase shifter outputs the reflected signal; obtain a second comparison result of the comparator when the phase shifter outputs the phase-shifted reflected signal; and detect a phase range to which the phase of the reflection coefficient belongs based on the first comparison result and the second comparison result.
2. The phase detector of claim 1 , wherein the second subtractor comprises:
a non-inverting terminal configured to receive the incident signal; and
an inverting terminal configured to receive the output of the phase shifter.
3. The phase detector of claim 1 , wherein the comparator is configured to output a first result value when the phase reference voltage is equal to or greater than the phase comparison voltage, and to output a second result value when the phase reference voltage is smaller than the phase comparison voltage.
4. The phase detector of claim 3 , wherein the control unit is configured to:
determine that the phase of the reflection coefficient belongs to a first region when the first comparison result is the first result value and the second comparison result is the first result value;
to determine that the phase of the reflection coefficient is included in a second region when the first comparison result is the first result value and the second comparison result is the second result value;
to determine that the phase of the reflection coefficient is included in a third region when the first comparison result is the second result value and the second comparison result is the first result value; and
to determine that the phase of the reflection coefficient is included in a fourth region when the first comparison result is the second result value and the second comparison result is the second result value.
5. The phase detector of claim 1 , further comprising:
a third subtractor configured to output an additional phase reference voltage, the third subtractor comprising a non-inverting terminal configured to receive the incident signal and an inverting terminal connected to a ground node;
a delay line configured to delay a phase of the output of the phase shifter;
a fourth subtractor configured to output an additional phase comparison voltage by using a difference between the incident signal and an output of the delay line; and
an additional comparator configured to output a comparison result by comparing the additional phase reference voltage with the additional phase comparison voltage,
wherein the control unit is configured to: obtain a third comparison result of the additional comparator when the phase shifter outputs the reflected signal; obtain a fourth comparison result of the additional comparator when the phase shifter outputs the phase-shifted reflected signal; and detect a phase range to which the phase of the reflection coefficient belongs based on the first comparison result, the second comparison result, the third comparison result, and the fourth comparison result.
6. An amplifier module for use in an RF device comprising the phase detector of claim 1 .
7. The amplifier module of claim 6 , wherein the second subtractor comprises:
a non-inverting terminal configured to receive the incident signal; and
an inverting terminal configured to receive the output of the phase shifter.
8. The amplifier module of claim 6 , wherein the comparator is configured to output a first result value when the phase reference voltage is equal to or greater than the phase comparison voltage, and to output a second result value when the phase reference voltage is smaller than the phase comparison voltage.
9. The amplifier module of claim 8 , wherein the control unit is configured to determine that the phase of the reflection coefficient belongs to a first region when the first comparison result is the first result value and the second comparison result is the first result value,
to determine that the phase of the reflection coefficient is included in a second region when the first comparison result is the first result value and the second comparison result is the second result value,
to determine that the phase of the reflection coefficient is included in a third region when the first comparison result is the second result value and the second comparison result is the first result value, and
to determine that the phase of the reflection coefficient is included in a fourth region when the first comparison result is the second result value and the second comparison result is the second result value.
10. The phase detector of claim 1 , wherein the non-inverting terminal of the first subtractor receives the incident signal through a resistor.
11. The phase detector of claim 10 , wherein the non-inverting terminal is a first non-inverting terminal, the resistor is a first resistor, and the second subtractor comprises a second non-inverting terminal for receiving the incident signal through a second resistor.
12. The phase detector of claim 1 , wherein the inverting terminal of the first subtractor is connected to a ground node through a resistor.
13. The phase detector of claim 12 , wherein the inverting terminal is a first inverting terminal, the resistor is a first resistor, and the second subtractor comprises a second inverting terminal for receiving the incident signal through a second resistor.
14. The phase detector of claim 1 , wherein the phase reference voltage has a constant value irrespective of a phase of a reflection coefficient.
15. The phase detector of claim 1 , wherein the phase comparison voltage varies as a phase of the reflection coefficient varies.
16. The phase detector of claim 1 , further comprising a low pass filter that is connected to an output terminal of the first subtractor and outputs the phase reference voltage.
17. The phase detector of claim 1 , further comprising a low pass filter that is connected to an output terminal of the second subtractor and outputs the phase comparison voltage.