Back to results
US 4,543,538 AGranted
Complementary output amplifier with an input for offsetting voltages
AssigneeLenco, Inc.
InventorRichard D. Fay
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeLenco, Inc.
InventorRichard D. Fay
Estimating the term…
An amplifier circuit having first, second and third inputs and first and second input impedance elements connected respectively to the first and second inputs, a first differential stage connected between the first and second input impedance elements, first and second output stages connected to the differential stage outputs, the first and second output stages produce complementary voltage output signals on respective first and second outputs, first and second cross-coupled differential feedback loops linking the first output to the second input of the first differential stage and the second output to the first input of the first differential stage, the first and second outputs are linked to each other by a voltage divider circuit the midpoint of which is connected to one input of a second differential stage, the third input being the other input of the second differential stage, the output of the second differential amplifier causing a change in a current repeater circuit which in turn causes a change in the first and second output stages, and the changes in the output stages operating to cancel inphase noise and insert common mode portions into the complementary output signals.
An amplifier circuit having first and second inputs, first and second outputs, a first differential pair of active elements connected between the first and second inputs, a first negative feedback circuit connected between the second output and a first active element of the first differential pair, a second negative feedback circuit connected between the first output and a second active element of the first differential pair, first and second output stages associated respectively with the first and second outputs and respectively connected to said active elements of said first differential pair, a voltage divider circuit connected between the first and second outputs, said voltage divider having an intermediate connection location, a reference circuit including a second differential pair of active elements, a reference input port connected to one of the active elements of said second pair, said intermediate connection location of the voltage divider circuit connected to the other active element of said second pair, other active elements respectively connected to the active elements of the first differential pair and to the active elements of the reference circuit, said other active elements responding to variations occurring across the reference circuit and operating in conjunction with the first and second output stages to cancel in phase signals and noise appearing on the first and second outputs, and circuit means operatively connected to the active elements of said first differential pair, to said other active elements and to the reference circuit active elements to maintain them in their operation conditions.
An amplifier circuit comprising a first differential circuit including a pair of active current controlled elements connected in series with associated impedence elements, a pair of input terminals connected across the first differential circuit, a first current source connected to the said active current controlled elements, a first pair of output active elements operatively connected to one of the active current controlled elements of the first differential circuit, a second pair of output active elements operatively connected to the other active current controlled element of the first differential circuit, a first negative feedback circuit connected between the circuit of the second pair of output active elements and the circuit associated with the one active element of the first differential circuit, a second negative feedback circuit connected between the circuit of the first pair of output active elements and the circuit associated with the other active element of the first differential circuit, a voltage divider circuit having a first connection to the circuit of the first pair of output active elements, a second connection to the circuit of the second pair of output active elements, and an intermediate connection, a second current source, a control pair of differentially connected active elements having a first connection to the intermediate connection, a second connection to the second current source and a third connection, and input means to the third connection to establish a control condition on the intermediate connection.
An amplifier circuit having first, second and third input locations, and first and second output locations comprising,
Dependencies are inferred from the claim text.