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US 2002/0171488 A1Published application
Amplifier
AssigneeRohm Co., Ltd.
InventorMasashi Horimoto
Life of this patent
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Abstract
An amplifier has a p-type and an n-type difference transistor pairs providing respective outputs, and is adapted to provide the outputs of the pairs in an integrated form. When the level of the input signal is below a predetermined level, only the p-type difference transistor pair is activated, and when the level of the input signal is higher than the predetermined level, the n-type difference transistor pair is also activated. The amplifier has an expanded dynamic range with a suppressed noise level.
Claims10
An amplifier, comprising;
- a first amplifier circuit having a difference pair of transistors having a first conduction-type (difference transistor pair of the first conduction-type) for amplifying an input signal to provide a first output signal;
- a second amplifier circuit having a difference pair of transistors having a second conduction-type (difference transistor pair of the second conduction-type) for amplifying said input signal to provide a second output signal, wherein
- only said first amplifier circuit is activated when the level of said input signal is lower than a predetermined level and said first and second amplifier circuits are activated when the level of said input signal is higher than said predetermined level;
- and
- said amplifier is adapted to output said first and second output signals in an integrated form.
2 more elements
An amplifier, comprising;
- a first amplifier circuit having a difference transistor pair of the first conduction-type for amplifying an input signal to provide a first output signal;
- a second amplifier circuit having a difference transistor pair of the second conduction-type for amplifying said input signal to provide a second output signal;
- a controller adapted to activate said second amplifier circuit when the level of said input signal is higher than a predetermined level and inactivate said second amplifier circuit when the level of said input signal is lower than said predetermined level;
- and
- an output circuit for outputting said first and second output signals in an integrated form.
2 more elements
Dependencies are inferred from the claim text.