Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1985-02-11
1986-08-19
Wan, Gene
Amplifiers
With semiconductor amplifying device
Including gain control means
330254, H03G 320
Patent
active
046072349
ABSTRACT:
Gain-controlled amplifier arrangement with a cascade arrangement of first and second gain-controlled amplifier stages, an AM-detection circuit and an integrating arrangement for generating a control voltage for the two stages and a threshold circuit for generating first and second threshold voltages, for delaying at an increasing input level the start of the control of the first stage (1-8) relative to that of the second stage (19-28). So as to prevent the gain control of the first stage from starting, for example because of an unwanted variation of the threshold voltages, before the gain control of the second stage has ended, the control ranges of the two stages are separated from each other by a separation area in which no gain control is effected. In order to prevent an unwanted deviation of the output level in that separation area the control voltage is generated by integration of a current in a capacitor (37), which current varies with the input level, so that this control does not only depend on the actual input level but also on the duration of occurrence of this input level.
Nauta Hendrikus C.
Nordholt Ernst H.
Briody Thomas A.
Rich Marianne R.
Streeter William J.
U.S. Philips Corporation
Wan Gene
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