Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1998-12-10
2000-06-06
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including gain control means
330282, 330284, 381107, 381120, H03G 310, H03G 312, H03G 300, H03F 2100
Patent
active
06072367&
ABSTRACT:
An electronic balance adjusting circuit comprises a register for holding a balance data and capable of changing the balance data held in the register, a first ALU receiving the balance data held in the register for outputting a first digital value corresponding to a first ratio, and a second ALU receiving the balance data held in the register for outputting a second digital value corresponding to a second ratio having such an inverse increase/decrease relation to the first ratio that when the first ratio increases, the second ratio decreases and when the first ratio decreases, the second ratio increases. A first digital-to-analog converter receives the first digital value to output a first analog signal indicative of the first ratio, and a second digital-to-analog converter receives the second digital value to output a second analog signal indicative of the second ratio. A first variable attenuator receives a first input signal and is controlled by the first analog signal to output a first output signal which has been attenuated by the attenuation amount in accordance with the first analog signal, and a second variable attenuator receives a second input signal and is controlled by the second analog signal to output a second output signal which has been attenuated by the attenuation amount in accordance with the second analog signal.
REFERENCES:
patent: 4794343 (1988-12-01), Yang
patent: 4947440 (1990-08-01), Bateman et al.
patent: 5187619 (1993-02-01), Sidman
patent: 5410280 (1995-04-01), Linguet et al.
patent: 5450494 (1995-09-01), Okubo et al.
NEC Corporation
Nguyen Patricia T.
Pascal Robert
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