Improving Linear Regulator Power Supply Ripple Rejection (PSRR) and Output Noise
نویسنده
چکیده
The PSRR of a linear regulator is determined by three factors: 1. The PSRR of the bandgap voltage reference, whose output ripple affects the output ripple of the linear regulator up to the roll-off frequency of the bandgap. 2. The open-loop gain of the feedback loop (AV), which is roughly equal to the open-loop gain of the error amplifier, up to the 0dB (unity gain) crossover frequency of the linear regulator (Equation 1). 3. The open-loop gain from VIN to VOUT (AVO), which is determined by the parasitic parameters of the pass element and values of external components (especially the output capacitor) along the VIN to VOUT path, starting from the 0dB crossover frequency (Equation 1).
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