[Shishuo Knowledge] Four major advantages of differential circuits in RF signal chain applications!
Using differential circuits can achieve higher signal amplitudes than using single-ended circuits
At the same supply voltage, differential signaling can provide twice the amplitude of single-ended signaling. It can also provide better linearity and SNR performance.
Figure 1. Differential output amplitude.
Differential circuits have good immunity to external EMI and crosstalk from nearby signals
This is because the received useful signal voltage is doubled, and the effect of noise on tightly coupled traces is theoretically the same, they cancel each other out.
Differential signals also tend to generate lower EMI
This is because changes in signal level (dV/dt or dI/dt) create opposing magnetic fields, which again cancel each other out.
Differential signaling suppresses even-order harmonics
An example of a continuous wave (CW) passing through a gain block is shown below.
When using a single-ended amplifier , as shown in Figure 2, the output can be expressed as Equation 1 and Equation 2.
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Figure 2. Single-ended amplifier.
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When a differential amplifier is used,
the input and output are shown in Figure 3 and expressed as Equation 3, Equation 4, Equation 5, and Equation 6.
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Figure 3. Differential amplifier.
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Ideally, the output does not have any even-order harmonics, making differential circuits a better choice for communications systems.
Original article from Analog Devices
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