Peak level detecting device and method
AssigneeKabushiki Kaisha Toshiba
InventorOsamu Kinoshita
Life of this patent
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Abstract
A device and method for detecting a peak level of an input signal. The input signal is amplified by a first amplifier. A switching signal corresponding to an output signal from the first amplifier is generated and a held peak level of the switching signal is fed back to the first amplifier negatively. Also, the switching signal is amplified by a second amplifier. A compensator generates a bias compensating signal for supplying to the first and second amplifiers to offset for the current drain that would otherwise occur.
Claims25
A device for detecting a peak level of an input signal, comprising:
- first amplifying means for amplifying the input signal to produce an amplified output signal;
- switching means, connected to the first amplifying means, for generating a switching signal corresponding to the amplified output signal from the first amplifying means;
- holding means, connected to the switching means, for holding a peak level of the switching signal from the switching means;
- feedback means for negatively feeding back the peak level from said holding means to the first amplifying means as a negative feedback signal;
- second amplifying means for amplifying the switching signal from the switching means;
- and
- compensating means for generating a bias compensating signal to compensate for a bias level of the negative feedback of said first amplifying means and a bias level of said second amplifying means, and for providing the bias compensating signal to the first and second amplifying means, said bias compensating means including means for adjusting an amount of compensation for said bias levels.
A method of detecting a peak level of an input signal, comprising the steps of:
- amplifying the input signal, as a function of an negative feedback signal, by first amplifying means to produce an amplified signal;
- generating a switching signal corresponding to the amplified signal;
- holding a peak level of the switching signal;
- feeding back the peak level as the negative feedback signal to the first amplifying means;
- amplifying the switching signal using a second amplifying means;
- adjusting an amount of bias compensation;
- and
- generating an adjustable bias compensating signal corresponding to said adjusted amount for supplying to the first and second amplifying means to compensate biases thereof.
Dependencies are inferred from the claim text.