US 7,126,384 B2Granted

Peak detection circuit with double peak detection stages

AssigneeMediatek Inc.

InventorsTse-Hsiang Hsu, Yung-Yu Lin, Chih-Cheng Chen

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Abstract

A peak detection circuit with double peak detection stages includes an analog peak detector, an analog-to-digital converter (ADC), and a digital peak detector. The analog peak detector receives an analog input signal, detects a peak value of the analog input signal with a first period, and outputs an analog peak signal. The ADC receives the analog peak signal and converts it into a digital signal. The digital peak detector receives the digital signal, detects the peak value of the digital signal with a second period longer than the first period, and outputs a digital peak signal. Therefore, the analog peak signal will not decay seriously due to the leakage and the digital peak signal can hold the digital peak value for a long time.

Claims6

Dependent claims

A peak detection circuit with double peak detection stages, comprising:

an analog peak detector for receiving an analog input signal, detecting a peak value of the analog input signal periodically with a first duration of time, and outputting an analog peak signal;
an analog-to-digital convertor for receiving the analog peak signal, and converting the analog peak signal into a digital signal in accordance with a sampling clock having a duration of time substantially equal to the first duration of time;
and
a digital peak detector for receiving the digital signal, detecting a peak value of the digital signal periodically with a second duration of time longer than the first duration of time, and outputting a digital peak signal;
wherein the analog peak detector comprising:
a first detector for receiving the analog input signal, operating when a first control signal is enabled, and outputting a first peak signal;
a second detector for receiving the analog input signal, operating when a second control signal is enabled, and outputting a second peak signal;
and
a multiplexer for receiving the first peak signal and the second peak signal, and selecting the first peak signal or the second peak signal to be output as the analog peak signal according to a selection signal.

6 more elements

Dependencies are inferred from the claim text.