Bias and decoupling circuit design for single-supply operational amplifiers Circuit diagram 1 shows the bias method for single-supply operational amplifiers. Resistors RA and RB form a voltage divider circuit and set the voltage at the positive input terminal to Vs/2. The input signal VIN is coupled to the positive input terminal through a capacitor. There are some serious limitations in this circuit. First, the circuit has almost no power supply rejection. Any change in the power supply voltage will directly change the bias voltage Vs/2 through the two voltage divider resistors, but the power supply rejection capability is a very important characteristic of the circuit. For example, a 1-volt change in the power supply voltage of this circuit can cause the output voltage Vs/2 of the bias circuit to change by 0.5 volts. The power supply rejection of this circuit is only 6dB.
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