Amplifying device

Details Amplifying device Amplifying device

2011-04-12

2011-04-12

Nguyen, Patricia (Department: 2817)

Amplifiers

Miscellaneous

Amplifier protection means

C330S296000, C330S298000

Reexamination Certificate

active

07924090

ABSTRACT:
An amplifying device for setting input impedance at several GΩ to several tens of GΩ and improving an ESD withstand current rating is provided.An ECM is connected to an input terminal21and frequency characteristics become flat to a voice band by high input impedance of a CMOS amplifier20and the input impedance is set at several GΩ to several tens of GΩ and thereby, response time after detecting a loud voice or turning on a power source of the ECM is speeded up and desired electrical characteristics are achieved. A path for releasing a surge voltage which occurs during assembly in the outside of an IC and intrudes from the input terminal21to a power source terminal or an earth terminal without an influence on a signal (20 Hz to 20 kHz) of a voice band entering from the input terminal21can be constructed by connecting a P-channel MOS transistor27and an N-channel MOS transistor28as an ESD protective element.

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