Gain controlled amplifier
AssigneeTokyo Shibaura Denki Kabushiki Kaisha
InventorsHisashi Yamada, Tsutomu Sugawara
Life of this patent
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Abstract
A gain controlled amplifier comprising a first means for providing a first current and a second current corresponding to an input signal, a second means for providing a first attenuated current corresponding to the first current, a third means for providing a second attenuated current corresponding to the second current, a fourth means for providing a control signal for changing magnitude of the first and second attenuated currents, and fifth means for providing an output signal corresponding to amplitudes of the first and second attenuator currents. The first means comprises a split current generator for separately providing the first current corresponding to the positive component of the input signal and the second current corresponding to the negative component of the input signal.
Claims11
A gain controlled amplifier comprising:
- (a) first means for separately providing a first current corresponding to the positive component of an input signal and a second current corresponding to the negative component of said input signal;
- (b) second means connected to said first means for providing a first attenuated current corresponding to said first current;
- (c) third means connected to said first means for providing a second attenuated current corresponding to said second current;
- (d) fourth means connected to said second and third means for providing a control signal for changing magnitude of said first and second attenuated currents;
- (e) fifth means connected to said second and third means for providing an output signal corresponding to said first and second attenuated current;
- (f) sixth means coupled to said first, second and third means, said sixth means being responsive to a third current which corresponds to a difference between said first current and said first attenuated current, and said sixth means also being responsive to a fourth current which corresponds to a difference between said second current and said second attenuated current, said sixth means providing said first means with an input current corresponding to said input signal.
A gain control amplifier comprising:
- (a) a signal source means for providing a first signal corresponding to the positive component of an input signal and a second signal corresponding to the negative component of said input signal;
- (b) an attenuator means connected to said signal source means for attenuating said first and second signals and providing a first and second attenuated signals in accordance with a control signal;
- (c) a signal inverter means connected to said attenuator means, for inverting said first attenuated signal to an inverted signal;
- and
- (d) a signal composing means connected to said attenuator means and said signal inverter means, for composing said second attenuated signal and said inverted signal to provide an output signal, wherein
- a transfer function of the gain controlled amplifier is changed by said control signal.
Dependencies are inferred from the claim text.