Differential amplifier including bias circuit with bias resistor

Details Differential amplifier including bias circuit with bias resistor Differential amplifier including bias circuit with bias resistor

1997-06-26

1999-03-23

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330301, 330308, 330311, H03F 345

Patent

active

058865780

ABSTRACT:
A differential amplifier receiving a first input signal and a second input signal, respectively, and amplifying voltage difference between the first and second input signals to output an output signal includes a first source follower circuit receiving an external data signal as the first input signal, and having an output node; a second source following circuit having a constant current source FET and receiving a reference voltage as the second input signal; and a bias circuit providing a signal having the same phase as the data signal from the output node of the first source follower circuit and inputting that signal to a gate terminal of the constant current source FET of the second source follower circuit. By providing an input interface circuit connected to an external signal source and producing a phase inversion signal from an input data signal in a differential amplifier or in a first stage differential amplifier connected to other amplifiers in multiple stages, the differential gain can be improved to a value approximately equal to that obtained when differential inputs are supplied.

REFERENCES:
patent: 5237289 (1993-08-01), Han
Anan B. Grebene, "Bipolar and MOS Analog Integrated Circuit Design", pp. 230-233 and pp. 274-277.

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