Digitally gain-controlled amplifying device, and camera using su

Details Digitally gain-controlled amplifying device, and camera using su Digitally gain-controlled amplifying device, and camera using su

1997-07-09

1999-07-13

Mottola, Steven J.

Amplifiers

Combined with automatic amplifier disabling switch means

330124R, 330129, 396 99, H03F 114, H03F 368

Patent

active

059232137

ABSTRACT:
An amplifying device has a decibel gain that evolves quasi-linearly as a function of the digital value of a control word C(O:M-1). The device includes: an amplifying stage with K amplifiers having mutually different decibel gains, the gain in decibels of each amplifier being a multiple of the same value G0; a switching stage with K switches; a gain-controlled amplifier having a gain which varies between 0 and G0 as a function of the value of the N least significant bits (C(O:N-1)) of the control word received at its digital input; and a decoder receiving a digital word including the (M-N) most significant bits (C(N:M-1)) of the control word. The decoder has K logic outputs controlling the K switches.

REFERENCES:
patent: 4598252 (1986-07-01), Andricos
patent: 4791446 (1988-12-01), Ishida et al.

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