Balanced amplifier and filter using the same
AssigneeKabushiki Kaisha Toshiba
InventorsTakeshi Ueno, Tetsuro Itakura
Life of this patent
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Abstract
A balanced amplifier comprising a pair of voltage-to-current converters including a first input terminal, a second input terminal, a first output terminal and a second output terminal to convert an input voltage applied to the first input terminal into an output current output from each of the first output terminal and the second output terminal, the second input terminal and the second output terminal of one of the converters being connected to the second input terminal and the second output terminal of the other of the converters to cancel common-mode components each other and extract differential-mode components.
Claims12
A voltage-to-current converter comprising:
- a first input terminal;
- a second input terminal;
- a first output terminal;
- a second output terminal;
- an adder configured to add voltage signals supplied to the first input terminal and the second input terminal respectively;
- a first inverting amplifier configured to reverse and amplify an output of the adder;
- a second inverting amplifier configured to reverse and amplify the output of the adder;
- a third inverting amplifier configured to reverse and amplify an output of the first inverting amplifier and to output a first reversed and amplified signal to the first output terminal as a first current signal;
- a fourth inverting amplifier configured to reverse and amplify an output of the second inverting amplifier and to output a second reversed and amplified signal to the second output terminal as a second current signal;
- a first capacitor connected between an input terminal and an output terminal of the third inverting amplifier;
- a second capacitor connected between an input terminal and an output terminal of the fourth inverting amplifier.
A voltage-to-current converter, comprising:
- a first input terminal;
- a second input terminal;
- a first output terminal;
- a second output terminal;
- an adder configured to add voltage signals supplied to the first input terminal and the second input terminal respectively;
- a first inverting amplifier configured to reverse and amplify an output of the adder;
- a second inverting amplifier configured to reverse and amplify an output of the first inverting amplifier and to output a first reversed and amplified signal to the first output terminal as a first current signal;
- a third inverting amplifier configured to reverse and amplify an output of the first inverting amplifier and to output a second reversed and amplified signal to the second output terminal as a second current signal;
- a first capacitor connected between an input terminal and an output terminal of the second inverting amplifier;
- a second capacitor connected between an input terminal and an output terminal of the third inverting amplifier.
Dependencies are inferred from the claim text.