Balanced amplifier and filter using the same
AssigneeKabushiki Kaisha Toshiba
InventorsTakeshi Ueno, Tetsuro Itakura, Zdzislaw Czarnul, Krystyna 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.
Claims10
1-18. (canceled)
A voltage-to-current converter comprising:
- a first input terminal;
- a second input terminal;
- a first output terminal;
- 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 an output of the first inverting amplifier;
- a third inverting amplifier which reverses and amplifies an output of the second 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;
- a second capacitor connected between an input terminal and an output terminal of the fourth inverting amplifier.
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.
Dependencies are inferred from the claim text.