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Automatic gain control device and method

A technology of automatic gain control and increasing rate, applied in the direction of gain control, amplification control, electrical components, etc., can solve the problems of large circuit area, loss of stability of radio signal receiving module 100, etc.

Inactive Publication Date: 2010-10-20
HIMAX MEDIA SOLUTIONS
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Problems solved by technology

[0003] Generally speaking, the automatic gain control device 114 in the radio signal receiving module 100 adjusts the gain of the radio frequency amplifier 104 and the intermediate frequency amplifier 110 through a digital signal power detector (that is, a peak detector), but the digital signal power detector needs more large circuit area to implement
In addition, the automatic gain control device 114 may also cause the radio signal receiving module 100 to lose its stability due to a non-obvious take-over point (Take-Over-Point, TOP).
In other words, since there is no obvious takeover point, the automatic gain control device 114 may simultaneously adjust the RF amplifier 104 and the IF amplifier 110, thereby causing the radio signal receiving module 100 to lose its stability

Method used

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  • Automatic gain control device and method

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Embodiment Construction

[0030] Certain terms are used in the specification and claims above to refer to particular elements. Those of ordinary skill in the art will appreciate that manufacturers may refer to the same element by different terms. This specification and the above-mentioned scope of patent application do not use the difference in name as a way to distinguish components, but use the difference in function of components as a criterion for distinguishing. The "comprising" mentioned in the entire specification and the above-mentioned claims is an open term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" here includes any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

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Abstract

The invention discloses an automatic gain control device. The device comprises a first compare module, a counting module, a second compare module and a control module, wherein the first compare module is used for comparing an input signal with a first critical level and a second critical level to respectively produce a first compare output signal and a second compare input signal; the counting module is used for carrying out counting operation on the first compare output signal and the second compare input signal to respectively produce a first count value and a second count value; the secondcompare module is used for comparing the first count value with the first critical value to produce a first judgment signal and comparing the second count value with the second critical value to produce a second judgment signal; and the control module is used for controlling the gain of a radio-frequency amplifier or an intermediate-frequency amplifier according to the first judgment signal and the second judgment signal.

Description

technical field [0001] The present invention relates to an Automatic Gain Control (AGC) device and related gain control method, especially a low-cost automatic gain control device. Background technique [0002] Please refer to figure 1 , figure 1 is a schematic diagram of a conventional radio signal receiving module (such as a digital TV receiver) 100 . The radio signal receiving module 100 includes an antenna 102, a radio frequency amplifier (Radio Frequency Amplifier) ​​104, a mixer (Mixer) 106, a surface acoustic wave (Surface AcousticWave, SAW) filter 108, an intermediate frequency amplifier (Intermediate Frequency Amplifier) ​​110, an analog / digital conversion A device (Analog-to-digital Converter, ADC) 112 and an automatic gain control (Automatic Gain Control, AGC) device 114 . The radio signal receiving module 100 is used for receiving a radio signal Sr and outputting a digital signal Sd corresponding to the radio signal Sr to a demodulator (Demodulator) 116 . The...

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Application Information

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IPC IPC(8): H03G3/20
Inventor 卢世权
Owner HIMAX MEDIA SOLUTIONS
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