초록 ▼

Circuits embodying the invention include a baseband amplifier to whose input is applied a baseband input signal (I or Q). The gain of the amplifier is controlled by sampling the output of the amplifier and supplying the sampled signals to a dynamic histogram control (DHC) circuit which includes a me

Circuits embodying the invention include a baseband amplifier to whose input is applied a baseband input signal (I or Q). The gain of the amplifier is controlled by sampling the output of the amplifier and supplying the sampled signals to a dynamic histogram control (DHC) circuit which includes a memory circuit for storing a histogram which contains a statistically expected response of the sampled baseband signal. The DHC circuit includes circuitry for comparing the sampled signals to the stored histogram for producing a gain control signal which is then used to control the gain of the amplifier. In some embodiments, the DHC circuit may also include circuitry for producing an offset adjustment signal to control the direct current (dc) level of the signal being sampled and hence its symmetry.

대표청구항 ▼

[ What is claimed is:] [1.] A combination comprising:an amplifier having an input terminal, an output terminal and a control terminal for the application thereto of a control signal for controlling the gain of the amplifier;input means applying an input signal to the input terminal of the amplifier;

[ What is claimed is:] [1.] A combination comprising:an amplifier having an input terminal, an output terminal and a control terminal for the application thereto of a control signal for controlling the gain of the amplifier;input means applying an input signal to the input terminal of the amplifier;memory means storing a histogram which contains a statistically expected amplitude distribution of the input signal; andmeans responsive to the output of the amplifier and to the contents of the histogram stored in said memory means for comparing the output of the amplifier with the contents of the histogram stored in the memory means for producing a gain control signal which is applied to the control terminal of the amplifier for controlling its gain.