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US 5,990,737 AGranted
Balanced amplifier using single-ended output operational amplifiers
AssigneeKabushiki Kaisha Toshiba
InventorsZdzislaw Czarnul, Hiroshi Tanimoto, Tetsuro Itakura
Life of this patent
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Abstract
A balanced amplifier includes first and second multi-input single-ended output differential amplifiers having matched characteristics and a feedback circuit. The feedback circuit connects differential input terminals and output terminals of the first and second multi-input single-ended output differential amplifiers so that all of the differential input terminals of the first and second multi-input single-ended output differential amplifiers are virtually shorted.
Claims18
A balanced amplifier comprising:
- a first multi-input single-ended output differential amplifier having a first differential input terminal pair to receive an externally applied first differential input signal, a second differential input terminal pair, and a first output terminal;
- a second multi-input single-ended output differential amplifier having a third differential input terminal pair to receive an externally applied second differential input signal, a fourth differential input terminal pair, and a second output terminal;
- and
- a feedback circuit including impedance elements for connecting said first, second, third and fourth differential input pairs and said first and second output terminals,
- wherein said first and second multi-input single-ended output differential amplifiers have matched characteristics.
2 more elements
A balanced amplifier comprising:
- a first amplifier circuit having first and second differential input terminal pairs and a first output terminal;
- and
- a second amplifier circuit having third and fourth differential input terminal pairs and a second output terminal,
- wherein an inverting input terminal of said first differential input terminal pair and a non-inverting input terminal of said third differential input terminal pair are connected to form a first node, and said first node is connected to a first input terminal of said balanced amplifier,
- a non-inverting input terminal of said first differential input terminal pair and an inverting input terminal of said third differential input terminal pair are connected to form a second node, and said second node is connected to a second input terminal of said balanced amplifier,
- a non-inverting input terminal of said second differential input terminal pair and a non-inverting input terminal of said fourth differential input terminal pair are connected to form a third node, and
- an inverting input terminal of said second differential input terminal pair and an inverting input terminal of said fourth differential input terminal pair are connected to form a fourth node, and
- said balanced amplifier further comprises a feedback circuit for performing feedback from said first and second output terminals to said first to fourth nodes.
5 more elements
A balanced amplifier comprising:
- a first amplifier circuit having first and second differential input terminal pairs and a first output terminal;
- and
- a second amplifier circuit having third and fourth differential input terminal pairs and a second output terminal,
- wherein non-inverting terminals of said first and third differential input terminal pairs are connected to first and second input terminals of said balanced amplifier,
- an inverting input terminal of said second differential input terminal pair and a non-inverting input terminal of said fourth differential input terminal pair are connected to form a first node,
- a non-inverting input terminal of said second differential input terminal pair and an inverting input terminal of said fourth differential input terminal pair are connected to form a second node, and
- said balanced amplifier further comprises:
- first and second impedance elements connected in series between said first and second nodes;
- a third impedance element connected between said first node and said first output terminal;
- a fourth impedance element connected between said second node and said second output terminal;
- and
- a third amplifier circuit having an input terminal connected to a connecting point of said first and second impedance elements and an output terminal negatively fed back to said first and third inverting input terminal pairs.
9 more elements
A balanced amplifier comprising:
- a first multi-input single-ended output differential amplifier having a first differential input terminal group including at least one differential input terminal pair to receive an externally supplied first differential input signal, a second differential input terminal group including plural differential input terminal pairs, and a first output terminal;
- a second multi-input single-ended output differential amplifier having a third differential input terminal group including at least one differential input terminal pair to receive an externally supplied second differential input signal, a fourth differential input terminal group including plural differential input terminal pairs, and a second output terminal;
- and
- a connecting circuit for connecting input terminals of said second and fourth differential input terminal groups and said first and second output terminals,
- wherein said first and second multi-input single-ended output differential amplifiers have matched characteristics.
2 more elements
A balanced amplifier comprising:
- a first amplifier circuit having first, second, and third differential input terminal pairs and a first output terminal;
- and
- a second amplifier circuit having fourth, fifth, and sixth differential input terminal pairs and a second output terminal,
- wherein a non-inverting input terminal of said first differential input terminal pair and an inverting input terminal of said fourth differential input terminal pair are connected to form a first node, and said first node is connected to a first input terminal of said balanced amplifier,
- an inverting input terminal of said first differential input terminal pair and a non-inverting input terminal of said fourth differential input terminal pair are connected to form a second node, and said second node is connected to a second input terminal of said balanced amplifier,
- a non-inverting input terminal of said second differential input terminal pair, a non-inverting input terminal of said third differential input terminal pair, a non-inverting input terminal of said fifth differential input terminal pair, and a non-inverting input terminal of said sixth differential input terminal pair are connected to form a third node, and said third node is applied with a predetermined voltage,
- an inverting input terminal of said second differential input terminal pair and an inverting input terminal of said fifth differential input terminal pair are connected to said second output terminal, and
- an inverting input terminal of said third differential input terminal pair and an inverting input terminal of said sixth differential input terminal pair are connected to said first output terminal.
5 more elements
Dependencies are inferred from the claim text.