Amplifiers – With semiconductor amplifying device – Including gain control means
Reexamination Certificate
2005-01-25
2005-01-25
Mottola, Steven J. (Department: 2817)
Amplifiers
With semiconductor amplifying device
Including gain control means
C330S136000
Reexamination Certificate
active
06847261
ABSTRACT:
A constant output signal can be achieved by controlling a gain variable amplifier2based on a level of an output signal which is derived by variably amplifying a receiving signal S1(input signal). An AGC output signal S11is detected by a detector circuit3, then a detected voltage signal S7is converted into a digital signal by an A/D converter4to output it to a CPU5. Then, the CPU5generates a control signal S8based on the detected voltage signal S7, then an A/D converter6converts the control signal S8into the analogue signal, and then the signal is sent out to the gain variable amplifier2to execute gain control. At this time, an RSSI detector portion9detects an RSSI signal S10corresponding to a transmitting signal level from the receiving signal S1, and then the CPU5sends out the control signal S8stored at the time of preceding execution of the gain control when the RSSI signal S10is reduced below a predetermined threshold value S12. In the weak received electric field strength, the control voltage for the gain variable amplifier is prevented reduction, and the proper automatic gain control can be made possible to thus achieve the good receiving characteristics.
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Ichikawa Yasufumi
Iwata Yasushi
Mottola Steven J.
Pearne & Gordon LLP
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