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US 2004/0164795 A1Published application
Balanced amplifier and filter using the same
AssigneeKabushiki Kaisha Toshiba
InventorsTakeshi Ueno, Tetsuro Itakura, Krystyma Czarnul, Zdzislaw Czarnul
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.
Claims22
A balanced amplifier comprising:
- a pair of voltage-to-current converters each including
- a first input terminal,
- a second input terminal,
- a first output terminal and
- a second output terminal,
- each of the voltage-to-current converters converting differential input voltages applied to the first input terminals of the converters into output currents output from both of the first output terminal and the second output terminal of each of the converters;
- wherein the second input terminals and the second output terminals of the converters are connected in common to cancel common-mode components and extract differential components.
4 more elements
A balanced amplifier comprising:
- a first voltage-to-current converter and a second voltage-to-current converter, each of the first voltage-to-current converter and the second voltage-to-current converter including
- a first input terminal,
- a second input terminal,
- a first current source which outputs a first current,
- a second current source which outputs a second current,
- a first output terminal outputting a third current and
- a second output terminal outputting a fourth current,
- wherein the third current is obtained by subtracting a sum current from the first current, the sum current corresponding to sum of currents corresponding to voltages applied to the first input terminal and the second input terminal respectively, and the fourth current being obtained by subtracting the sum current from the second current, and
- wherein the second input terminal and second output terminal of the first voltage-to-current converter and the second input terminal and second output terminal of the second voltage-to-current converter is connected in common, a differential input signal is input to the first input terminals of the first voltage-to-current converter and the second voltage-current converter, and a differential output signal is output from the first output terminal of the first voltage-to-current converter and the second voltage-current converter.
6 more elements
A balanced amplifier comprising:
- a first voltage-to-current converter and a second voltage-to-current converter, each of the first voltage-to-current converter and the second voltage-to-current converter including:
- a first input terminal,
- a second input terminal,
- a first output terminal and
- a second output terminal, and
- each of the first voltage-to-current converter and the second voltage-to-current converter supplying a current corresponding to sum of currents corresponding to voltages applied to the first input terminal and the second input terminal respectively to the first output terminal and the second output terminal so that a polarity of an output signal from the first output terminal is reversed with respect to a polarity of an input signal to the first input terminal, and a polarity of an output signal from the second output terminal is reversed with respect to a polarity of an input signal to the second input terminal,
- wherein the second input terminals and second output terminals of the converters is connected in common, a differential input signal is input to the first input terminals of the converters, and a differential output signal is output from the first output terminals of the converters.
4 more elements
A voltage-to-current converter comprising:
- a first input terminal,
- a second input terminal,
- a first output terminal, and
- a second output terminal;
- an adder which adds voltage signals supplied to the first input terminal and the second input terminal respectively;
- a first inverting amplifier which reverses and amplifies an output of the adder;
- a second inverting amplifier which reverses and amplifies the output of the adder;
- a third inverting amplifier which reverses and amplifies an output of the first inverting amplifier and outputs a first reversed and amplified signal to the first output terminal as a first current signal;
- a fourth inverting amplifier which reverses and amplifies an output of the second inverting amplifier and outputs 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;
- and
- a second capacitor connected between an input terminal and an output terminal of the fourth inverting amplifier.
9 more elements
A balanced amplifier comprising:
- a first and a second converters, each being a voltage-to-current converter and each including
- a first and a second input terminals,
- a first current source supplying a first current,
- a second current source supplying a second current,
- a first subtractor generating a third current by subtracting a sum current representing sum of currents corresponding to voltages applied to the first and second input terminals, from the first current,
- a second subtractor generating a forth current by subtracting the sum current form the second current,
- a first output terminal outputting the third current, and
- a second output terminal outputting the fourth current,
- wherein both of the second input terminals of the first and the second converters and both of the second output terminals of the first and second converters are connected in common, and
- a differential input signal is applied to the first input terminals of the first and the second converter, thereby obtaining a differential output signal on the first output terminals of the first and the second converters.
7 more elements
Dependencies are inferred from the claim text.