US3825854A — Amplifier with substantially zero distortion prod…

Claim 1

Independent Claim 241 words

An amplifier circuit with substantially zero harmonic distortion products comprising: a. an operational amplifier for amplifying an input signal said amplifier having inverting and non-inverting input terminals and an output terminal said operational amplifier including, coupled to its inverting terMinal, a resistor Ri, said operational amplifier also internally generating distortion products; b. resistive discriminator means R0 coupled across said amplifier to said inverting input terminal and to said output terminal, said resistive discriminator means for isolating the distortion products of said amplifier, said resistive discriminator means R0 further cooperating with said resistor Ri for providing closed loop gain Af R0/Ri for said operational amplifier, said resistive discriminator means further comprising at least two predetermined series coupled resistors r1 and r2 coupled across said operational amplifier to said inverting input terminal and to said output terminal, said resistors r1 and r2 for providing at their junction point a voltage signal substantially equal to the distortion products in said amplifier; c. electronic amplifier inverter means coupled to said resistive discriminator means at the junction point of said series coupled resistors r1 and r2 and also coupled to said noninverting input terminal of said operational amplifier said electronic amplifier inverter means for inverting with respect to the input signal the phase of the isolated distortion products of said amplifier said phase to be inverted by 180*, whereby said phase-inverted isolated distortion products are continuously applied to the non-inverting input terminal of said operational amplifier.

Claim 2

Dependent Claim 241 words

An amplifier circuit with substantially zero harmonic distortion products comprising: a. an operational amplifier for amplifying an input signal said amplifier having inverting and non-inverting input terminals and an output terminal said operational amplifier including, coupled to its inverting terMinal, a resistor Ri, said operational amplifier also internally generating distortion products; b. resistive discriminator means R0 coupled across said amplifier to said inverting input terminal and to said output terminal, said resistive discriminator means for isolating the distortion products of said amplifier, said resistive discriminator means R0 further cooperating with said resistor Ri for providing closed loop gain Af R0/Ri for said operational amplifier, said resistive discriminator means further comprising at least two predetermined series coupled resistors r1 and r2 coupled across said operational amplifier to said inverting input terminal and to said output terminal, said resistors r1 and r2 for providing at their junction point a voltage signal substantially equal to the distortion products in said amplifier; c. electronic amplifier inverter means coupled to said resistive discriminator means at the junction point of said series coupled resistors r1 and r2 and also coupled to said noninverting input terminal of said operational amplifier said electronic amplifier inverter means for inverting with respect to the input signal the phase of the isolated distortion products of said amplifier said phase to be inverted by 180*, whereby said phase-inverted isolated distortion products are continuously applied to the non-inverting input terminal of said operational amplifier.

Claim 3

Dependent Claim 208 words

An amplifier network with substantially zero distortion products comprising, a first electrical circuit, a second electrical circuit and a third electrical circuit, and an operational amplifier having an inverting and non-inverting input terminal and an output terminal, said first electrical circuit including a first resistor means said first electrical circuit being coupled to said inverting terminal of said operational amplifier, said second electrical circuit including resistive separator means for separating substantially all the harmonic distortion signal of said operational amplifier from said amplified fundamental signal of said operational amplifier, said resistive separator means also providing negative feedback for said operational amplifier, said resistive separator means also cooperating with said first resistor means for providing a predetermined closed-loop gain for said amplifier network, said second electrical circuit coupled to said output terminal of said operational amplifier and to said inverting terminal, said third electrical circuit including electronic phase inverting means, and wherein said third electrical circuit is coupled to said second electrical circuit and to said non-inverting terminal of said operational amplifier, said electronic phase inverting means for inverting the phase of the separated harmonic distortion signal of said operational amplifier, whereby said harmonic distortion signal is phase inverted and applied to said non-inverting terminal of said operational amplifier.

Claim 4

Dependent Claim 208 words

An amplifier network with substantially zero distortion products comprising, a first electrical circuit, a second electrical circuit and a third electrical circuit, and an operational amplifier having an inverting and non-inverting input terminal and an output terminal, said first electrical circuit including a first resistor means said first electrical circuit being coupled to said inverting terminal of said operational amplifier, said second electrical circuit including resistive separator means for separating substantially all the harmonic distortion signal of said operational amplifier from said amplified fundamental signal of said operational amplifier, said resistive separator means also providing negative feedback for said operational amplifier, said resistive separator means also cooperating with said first resistor means for providing a predetermined closed-loop gain for said amplifier network, said second electrical circuit coupled to said output terminal of said operational amplifier and to said inverting terminal, said third electrical circuit including electronic phase inverting means, and wherein said third electrical circuit is coupled to said second electrical circuit and to said non-inverting terminal of said operational amplifier, said electronic phase inverting means for inverting the phase of the separated harmonic distortion signal of said operational amplifier, whereby said harmonic distortion signal is phase inverted and applied to said non-inverting terminal of said operational amplifier.

Claim 5

Dependent Claim 45 words

An amplifier circuit as recited in claim 2 including a signal source coupled to said first circuit for introducing an electric signal to said amplifier network, and a signal sink coupled to said first and second circuits for abstracting electric signals from said amplifier network.

Claim 6

Dependent Claim 97 words

An amplifier network as recited in claim 3 wherein said separator means comprise impedance elements arranged in a subcircuit comprising separating resistors series-coupled to each other, said series-coupled resistors coupled to said first circuit, said output means of said amplifying means, and to ground, said series-coupled resistors also coupled at their junction to said inverting means, said series coupled resistors being of a predetermined magnitude to cause a voltage drop across one of said series-coupled resistors equal to the amplified input fundamental voltage signal whereby a fundamental signal null point, is caused at the serIes-coupled resistor junction.

Claim 7

Dependent Claim 24 words

An amplifier circuit as recited in claim 4 wherein said third circuit is coupled to said second circuit at the fundamental signal null point.

Claim 8

Dependent Claim 76 words

An amplifier network as recited in claim 5 including separating resistors coupled to said second circuit attenuator resistors coupled to said third circuit, and wherein said attenuating resistors have values equal to r1 and r2, said separating resistors have values equal to r3 and r4, said operational amplifier has open loop gain equal to Ao, and said inverting means are inverted amplifiers having gain equal to -Q and wherein, -Q ((r1 + r2/r1)/(r4/r3 + r4).Ao ).

Claim 9

Dependent Claim 43 words

An amplifier network as recited in claim 6 wherein said first impedance element has a value R2 and said second impedance element has a value R1, and said first electriccal circuit has closed loop gain equal to Af and wherein, Af -(R2/R1) .

Claim 10

Independent Claim 91 words

A method of eliminating harmonic distortion products in a D.C. amplifier network comprising the steps of: a. applying a fundamental electric signal into said D.C. amplifying network; b. amplifying the fundamental electric signal in said D.C. amplifying network; c. comparing the undistorted input signal with the distorted output signal; d. abstracting substantially all the distortion signal from said D.C. amplifying network by a single stage resistive electric circuit; e. inverting the phase of the distortion signal; and f. reinserting the inverted distortion signal into the input of said D.C. amplifying network.

Claim 11

Independent Claim 91 words

A method of eliminating harmonic distortion products in a D.C. amplifier network comprising the steps of: a. applying a fundamental electric signal into said D.C. amplifying network; b. amplifying the fundamental electric signal in said D.C. amplifying network; c. comparing the undistorted input signal with the distorted output signal; d. abstracting substantially all the distortion signal from said D.C. amplifying network by a single stage resistive electric circuit; e. inverting the phase of the distortion signal; and f. reinserting the inverted distortion signal into the input of said D.C. amplifying network.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1977-07-22	1978-01-21	1978-07-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1981-07-22	1982-01-21	1982-07-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1985-07-22	1986-01-21	1986-07-23	$7700.00	Window Closed / Lapsed

Amplifier with substantially zero distortion products

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