Automatic gain control method and device, and radio communication apparatus with said function
A technology of automatic gain control and gain control signal, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problem of circuit scale expansion, achieve the effect of expanding circuit scale, simple structure, and reducing initial introduction time
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no. 1 example
[0037] attached figure 1 Shown is a block diagram of the structure of the automatic gain controller according to the embodiment of the present invention. Although this embodiment is applied to a radio communication device, the automatic gain controller can be applied to various signal processors.
[0038] The automatic gain controller according to the present embodiment includes a variable gain amplifier 1 (variable gain amplifying means) that variably amplifies an input signal such as a received signal, and in a subsequent stage the resulting signal is output to a signal processing system. Such an automatic gain controller has a closed-loop control system that generates a gain control signal b based on an output signal c of a variable gain amplifier 1 to stably control the output signal c.
[0039] The closed-loop control system is equipped with a level detection circuit 2 that detects the level of the output signal of the variable gain amplifier 1, an A / D converter 3 that ...
no. 2 example
[0054] attached Figure 4 Shown is a flow chart of the operation procedure of the second embodiment. attached Figure 5 Shown is a waveform diagram of the gain control voltage in the operation according to the second embodiment. The structure of the automatic gain controller and the attached figure 1 The structure of the automatic gain controller of the first embodiment shown in is the same, so the corresponding description is omitted. For the operation, differences from the first embodiment are mainly described.
[0055] When the automatic gain controller is powered on (step S1), the determination section 9 outputs a switch control signal m to the selector switch 7 and selects the output of the scanning signal generator 6 (step S12). At the same time, the determination section 9 sends an instruction to the scanning signal generator 6 to generate the voltage scanning signal h (step S13). The determination section 9 obtains the difference f as the output value of the adder...
no. 3 example
[0063] attached Image 6 Shown is a flowchart of the operation procedure of the third embodiment. The structure of the automatic gain controller is the same as in the attached figure 1 The structure of the automatic gain controller of the first embodiment shown in is the same, so the corresponding description is omitted. For the operation, differences from the first and second embodiments are mainly described.
[0064] with attached Figure 4 Steps S11 to S15 are the same, when the automatic gain controller is powered on (step S21), the determination part 9 outputs the switch control signal m to the selector switch 7 and selects the output of the scan signal generator 6 (step S22). At the same time, the determination section 9 sends an instruction to the scan signal generator 6 to generate a voltage scan signal h (step S23). The decision section 9 obtains the difference f which is the output value of the adder 4 (step S14) and monitors that the difference f becomes 0 (step...
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