Automatic gain control analog-to-digital converting system and related method
AssigneeMStar Semiconductor, Inc.
InventorsKe-Chiang Huang, Ta-Chan Kao, Sterling Smith
Life of this patent
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Abstract
An analog-to-digital converting system with automatic gain control. The analog-to-digital converting system includes a programmable gain amplifier (PGA) for receiving and amplifying an input signal by a gain factor to generate an amplified input signal; an ADC, coupled to the PGA, for converting the amplified input signal into a digital signal according to an actual reference voltage signal; and an automatic gain controller, coupled to the PGA and the ADC, for jointly controlling the gain factor set to the PGA and the actual reference voltage signal set to the ADC according to a hysteretic behavior.
Claims18
An analog-to-digital converting system with automatic gain control, comprising:
- a programmable gain amplifier (PGA) for receiving and amplifying an input signal by a gain factor to generate an amplified input signal;
- an analog-to-digital converter (ADC), coupled to the PGA, for converting the amplified input signal into a digital signal according to an actual reference voltage signal;
- and
- an automatic gain controller, coupled to the PGA and the ADC, for jointly controlling the gain factor set to the PGA and the actual reference voltage signal set to the ADC according to a hysteretic behavior.
An automatic gain control method for controlling a programmable gain amplifier (PGA) in conjunction with an analog-to-digital converter (ADC), the PGA amplifying an input signal by a gain factor to generate an amplified input signal, the ADC converting the amplified input signal into a digital signal according to an actual reference voltage signal, the automatic gain control method comprising:
- determining a desired reference voltage signal for the ADC according to the digital signal and the currently used actual reference voltage signal;
- and
- jointly adjusting the gain factor set to the PGA and the actual reference voltage signal applied to the ADC according to the desired reference voltage signal and a hysteretic behavior.
Dependencies are inferred from the claim text.