Input signal level detection apparatus and method
AssigneeSamsung Electronics Co., Ltd.
InventorsDae-hoon KWON, Jeong-won LEE
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Abstract
A method and an input signal level detection apparatus that correctly detect a level of an input signal while consuming low power apparatus including: a full-wave rectifier outputting a full-wave rectified waveform by performing a full-wave rectification on a first signal corresponding to an input signal, and on a second signal having a phase difference of 180 degrees from the first signal; a common voltage detector detecting a common voltage of the first signal and the second signal; and a level detection unit detecting a level of the input signal, based on a subtraction result obtained by subtracting the common voltage from the full-wave rectified waveform.
Claims18
An input signal level detection apparatus, comprising:
- a full-wave rectifier outputting a full-wave rectified waveform by performing a full-wave rectification on a first signal corresponding to an input signal, and on a second signal having a phase difference of 180 degrees from the first signal;
- a common voltage detector detecting a common voltage of the first signal and the second signal;
- and
- a level detection unit detecting a level of the input signal, based on a subtraction result obtained by subtracting the common voltage from the full-wave rectified waveform.
An input signal level detection method, comprising:
- performing a full-wave rectification on a first signal corresponding to an input signal, and on a second signal having a phase difference of 180 degrees from the first signal and outputting a full-wave rectified waveform;
- detecting a common voltage of the first signal and the second signal;
- and
- detecting a level of the input signal, based on a subtraction result obtained by subtracting the common voltage from the full-wave rectified waveform.
An input signal level detection apparatus, comprising:
- a full-wave rectifier outputting a full-wave rectified waveform by performing a full-wave rectification on a first signal corresponding to an input signal, and on a second signal having a phase difference of 180 degrees from the first signal;
- a common voltage detector detecting a common voltage of the first signal and the second signal;
- and
- a level detection unit including a single operational amplifier detecting a level of the input signal, based on a subtraction result obtained by subtracting the common voltage from the full-wave rectified waveform.
Dependencies are inferred from the claim text.