Satellite communications solid-state block upconverter with gain compensation
An apparatus including a circuit, a temperature sensor, a sensor and a control system. The circuit may be configured to receive an input signal and a configuration signal and generate an output signal in response to performing an upconversion of the input signal to a selected frequency band and an amplification of the input signal in response to the configuration signal. The temperature sensor may be configured to measure a temperature. The sensor may be configured to measure a sensor value. The control system may be configured to generate the configuration signal in response to the temperature and the sensor value. The configuration signal may be generated to maintain a gain of the amplification at a target level over a range of an operating condition during the upconversion. The target level of the gain for the operating condition may be determined in response to a pre-determined calculation.
1. An apparatus comprising:
a circuit configured to (i) receive an input signal and a configuration signal and (ii) generate an output signal in response to (a) an upconversion of said input signal to a selected frequency band and (b) an amplification of said input signal in response to a gain and said configuration signal;
a temperature sensor configured to measure a temperature value;
a sensor circuit configured to measure a sensor value; and
a control system configured to generate said configuration signal in response to (i) said temperature value and (ii) said sensor value, wherein
(a) said configuration signal is generated to maintain said gain of said amplification at a target level over a range of one or more operating conditions of said apparatus during said upconversion,
(b) said target level of said gain over said range of said operating conditions is determined in response to a pre-determined calculation, and
(c) said pre-determined calculation enables said configuration signal to adjust said amplification to prevent changes of said one or more operating conditions from having an effect on said gain.
2. The apparatus according to claim 1 , wherein (i) said apparatus further comprises a power amplifier, an upconverting mixer and at least one gain control element, (ii) said gain control element is configured to adjust said gain in response to said configuration signal and (iii) said control system comprises a monitor configured to read said temperature value and said sensor value.
3. The apparatus according to claim 2 , wherein said apparatus is a solid-state block upconverter of a satellite communications system.
4. The apparatus according to claim 1 , wherein said selected frequency band comprises at least one of (a) X-band frequency, (b) Ku-band frequency and (c) a Ka-band frequency.
5. The apparatus according to claim 1 , wherein said sensor circuit comprises a power detector configured to measure an output power of said output signal as said sensor value.
6. The apparatus according to claim 1 , wherein said sensor circuit comprises a power detector configured to measure an input power of said input signal as said sensor value.
7. The apparatus according to claim 1 , wherein said sensor circuit comprises a power detector configured to measure an intermediate power level of said apparatus as said sensor value.
8. The apparatus according to claim 1 , wherein said sensor circuit comprises a voltage monitor configured to measure a voltage as said sensor value.
9. The apparatus according to claim 1 , wherein said sensor circuit comprises a current monitor configured to measure a current as said sensor value.
10. The apparatus according to claim 1 , wherein said sensor circuit comprises a second temperature sensor configured to measure a second temperature value as said sensor value.
11. The apparatus according to claim 10 , wherein (i) said temperature value measured by said temperature sensor comprises a temperature of a power amplifier and (ii) said second temperature value measured by said second temperature sensor comprises a temperature of a second component of said apparatus.
12. The apparatus according to claim 1 , wherein said pre-determined calculation is performed by a processor of said control system in response to executing computer readable instructions comprising a first variable for said temperature value and a second variable for said sensor value.
13. The apparatus according to claim 1 , wherein results of said pre-determined calculation are stored in a lookup table.
14. The apparatus according to claim 1 , wherein (i) said sensor circuit comprises a plurality of measurement devices and (ii) said sensor value comprises a plurality of measurement values.
15. The apparatus according to claim 14 , wherein (i) said plurality of measurement devices comprise (a) a power detector and (b) a second temperature sensor and (ii) said measurement values comprise (a) an output power of said output signal and (b) a second temperature value.
16. The apparatus according to claim 1 , wherein said operating conditions comprise an ambient temperature and said temperature value.
17. The apparatus according to claim 1 , wherein said operating conditions comprise a power level of said output signal and said temperature value.
18. The apparatus according to claim 1 , wherein said operating conditions comprise a loss of power to an amplifier of said circuit and said temperature value.
19. The apparatus according to claim 1 , wherein said operating conditions comprise an amount of time after a sudden change in output power of said output signal and said temperature value.
20. The apparatus according to claim 1 , wherein said operating conditions comprise a combination of an ambient temperature, a power level of said output signal, an age of said apparatus and said temperature value.
21. The apparatus according to claim 1 , wherein said target level over said range of said operating conditions comprise adjusting said gain of said amplification to be substantially constant.
22. The apparatus according to claim 1 , wherein maintaining said target level over said range of said operating conditions enables a quiescent value for a power level of said output signal to be reached without observing an overshoot, an undershoot or an amount of oscillation of said power level of said output signal compared to a gain compensation performed using said temperature value alone.
23. The apparatus according to claim 1 , wherein (i) said effect of said one or more operating conditions on said gain is a thermal effect and (ii) said thermal effect is caused by a difference between gradual heating rate of a power amplifier compared with a heating of a different rate of other components of said apparatus.
24. The apparatus according to claim 1 , wherein (i) said one or more operating conditions comprise a sudden change in output power and said temperature value from powering on said apparatus and (ii) said effect prevented by said configuration signal comprises a gain transient.