Differential amplifier including bias circuit with bias resistor

A differential amplifier receiving a first input signal and a second input signal, respectively, and amplifying the voltage difference between the first and second input signals to output an output signal, the differential amplifier including:

• a first source follower circuit receiving an external data signal as a first input signal, and having an output node;
• a second source follower circuit having a constant current source FET and including a gate terminal receiving a reference voltage as a second input signal;
• and
• a bias circuit taking a signal in phase with the data signal from the output node of the first source follower circuit and inputting that signal to the gate terminal of the constant current source FET of the second source follower circuit, the bias circuit comprising:
• a reverse-biased diode connecting the output node of the first source follower circuit to the gate terminal of the constant current source FET of the second source follower circuit;
• and
• a bias resistor connected to the gate terminal and supplying the gate bias of the current source FET of the second source follower circuit.

A differential amplifier receiving a first input signal and a second input signal, respectively, and amplifying the voltage difference between the first and second input signals to output an output signal, the differential amplifier including:

• a first source follower circuit receiving an external data signal as a first input signal, and having an output node;
• a second source follower circuit having a constant current source FET and including a gate terminal receiving a reference voltage as a second input signal;
• and
• a bias circuit taking a signal in phase with the data signal from the output node of the first source follower circuit and inputting that signal to the gate terminal of the constant current source FET of the second source follower circuit, the bias circuit comprising:
• a by-pass resistor connecting the output node of the first source follower circuit to the gate terminal of the constant current source FET of the second source follower circuit;
• and
• a bias resistor connected to the gate terminal and supplying the gate bias of the current source FET of the second source follower circuit.