Combining two devices to achieve improved noise performance is a common practice. The improvement is possible due to the random nature of noise. When combining two outputs, the signals are correlated meaning they are of equal amplitude and phase. This yields a 6 dB signal increase. The noise is uncorrelated; there are random amplitude and phase differences between the noise signals. The combined incoherent noise yields on average a 3 dB increase. Overall, there is a net 3 dB improvement in signal to noise ratio (SNR) performance.