Patent ID: 7755523

Claim:
A method comprising: receiving a signal; determining whether a signal mode of the signal is a first signal mode or a second signal mode; adjusting a gain of a variable gain amplifier to: a first gain value if the signal mode of the signal is determined to be the first signal mode, or a second gain value if the signal mode of the signal is determined to be the second signal mode, wherein the first signal mode comprises a requirement for a signal to noise ratio or signal to quantization noise ratio that is higher than a signal to noise ratio or signal to quantization ratio of a requirement of the second signal mode and the first gain value comprises a higher value than the second gain value; amplifying the signal with the variable gain amplifier by the first gain value or the second gain value; and converting the signal to a digital signal with an analog to digital converter after the signal is amplified with the variable gain amplifier by the first gain value or the second gain value.