초록 ▼

A resistorless amplifier circuit uses integrated operational transconductance amplifiers to realize a plurality of circuit transfer functions. The preferred embodiment produces an output signal voltage V.sub.out (500) that is either g.sub.m1 /g.sub.m3 or g.sub.m1 /(g.sub.m3 -g.sub.m1) times the inpu

A resistorless amplifier circuit uses integrated operational transconductance amplifiers to realize a plurality of circuit transfer functions. The preferred embodiment produces an output signal voltage V.sub.out (500) that is either g.sub.m1 /g.sub.m3 or g.sub.m1 /(g.sub.m3 -g.sub.m1) times the input signal voltage V.sub.in (400). Additionally, an alternative embodiment implements a resistorless summing and subtracting operational transconductance amplifier circuit that realizes an output signal voltage as follows: ]EQU1 ] The resistorless amplifier circuit includes a first operational transconductance amplifier (100) with a transconductance g.sub.m1, a second operational transconductance amplifier (200) with a transconductance g.sub.m2, and a third operational transconductance amplifier (300) with a transconductance g.sub.m3.

대표청구항 ▼

[ What is claimed is:] [1.] A resistorless amplifier circuit using integrated operational transconductance amplifiers, comprising:a first operational transconductance amplifier having a transconductance g.sub.m1, a first inverting input terminal, a first non-inverting input terminal, and a first out

[ What is claimed is:] [1.] A resistorless amplifier circuit using integrated operational transconductance amplifiers, comprising:a first operational transconductance amplifier having a transconductance g.sub.m1, a first inverting input terminal, a first non-inverting input terminal, and a first output terminal;a second operational transconductance amplifier having a transconductance g.sub.m2, a second inverting input terminal, a second non-inverting input terminal, and a second output terminal, the first output terminal being coupled to the second non-inverting input terminal, and the second inverting input terminal being coupled to a reference voltage V.sub.ref ; anda third operational transconductance amplifier having a transconductance g.sub.m3, a third inverting input terminal, a third non-inverting input terminal, and a third output terminal, the second output terminal being coupled to the third inverting input terminal, the third output terminal being coupled to the first output terminal and the second non-inverting input terminal, and the third non-inverting input terminal being coupled to the reference voltage V.sub.ref, wherein an input signal V.sub.in applied to the first operational transconductance amplifier results in an output signal V.sub.out at the second output terminal with an amplitude g.sub.m1 /g.sub.m3 times the input signal V.sub.in.