Amplifier circuit
AssigneeQuantum Corporation
InventorRonald R. Moon
Life of this patent
Estimating the term…
Abstract
A driver amplifier circuit for an electromechanical position translator having two coils of substantially equal inductance and resistance is disclosed. The circuit includes an input for a control voltage representing desired translator position and a reference voltage, a very low value reference resistor series connected between the two coils, differentially driven push pull amplifiers connected to drive the coils, and two equal value feedback resistors connected from the reference resistor to inverting inputs of the amplifiers, whereby absolute magnitude of output voltage equals the input voltage plus twice the reference voltage, and wherein zero differential input volts yields zero current flow through the coils.
Claims8
A driver amplifier circuit for an electromechanical position translator having two low impedance coils of substantially equal inductance and resistance, said amplifier circuit comprising
- input means for providing a control voltage V.sub.in and for providing a control voltage -V.sub.in representing desired translator position;
- said two coils being series connected, and a very low ohmic value reference resistor connected in series between said coils to form a +V.sub.out node and a -V.sub.out node,
- a pair of differentially driven push pull amplifier means connected between ground and supply potential, one of said pair having an input connected to said +V.sub.in voltage and to a reference source voltage V.sub.ref and the other of said pair having an input connected to said -V.sub.in voltage and to said reference source voltage V.sub.ref and having outputs connected to drive said coils, one of said pair connected to one of said coils and the other of said pair connected to the other of said coils;
- two equal, high ohmic value feedback resistors, one thereof being connected from said +V.sub.out node to an inverting input of one of said amplifier pair and the other thereof being connected from said -V.sub.out node to an inverting input of the other of said differentially driven push pull amplifier pair means;
- whereby current passing through said coils is substantially proportional to said input control voltage within a range of linearity and operating frequency of said circuit.
A driver amplifier circuit for an electromechanical position translator having two coils of substantially equal inductance and resistance, said amplifier circuit comprising:
- an input node for a control voltage;
- a common reference voltage;
- first push pull amplifier means connected between ground and supply potential and having differential inputs with a non-inverting input being connected to said common reference voltage and an inverting input being connected to said input node through a first resistor and having an output;
- unity gain inverter amplifier means having an input connected to said input node through a second resistor and having an output, for inverting the sign of the voltage at said input node without change in absolute value thereof;
- second push pull amplifier means connected between ground and supply potential and having differential inputs with a non-inverting input being connected to said common reference voltage and an inverting input being connected to said output of said inverting amplifier means through a third resistor and having an output;
- a fourth reference resistor connected in series between said two coils;
- one of said coils being connected to the output of said first operational amplifier means, and the other of said coils being connected to the output of said second operational amplifier means;
- a fifth feedback resistor connected between one node of said fourth resistor and said inverting input of said first amplifier means;
- a sixth feedback resistor connected between the other node of said fourth resistor and said inverting input of said second amplifier means.
Dependencies are inferred from the claim text.