Differential amplifier with input signal determined standby stat

Details Differential amplifier with input signal determined standby stat Differential amplifier with input signal determined standby stat

1998-01-22

2000-02-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 62, 327 74, 365226, H03K 5153

Patent

active

060284587

ABSTRACT:
An input first stage circuit performing switching between activation and inactivation in response to an input signal includes a differential amplifier for comparing the input signal with a reference voltage and a switching transistor for receiving a power supply disconnection signal to control the power supplied, and a level detection circuit including a low level standby detector for detecting a low level of the input signal and a high level standby detector for detecting a high level of the input signal. Each of the standby detectors includes an input stage transistor to which the input signal is inputted, the low level standby detector produces a power supply disconnection signal for stopping the power supplied to the differential amplifier when the detected level of the input signal is lower than the threshold voltage of the input stage transistor; the high level standby detector produces another power supply disconnection signal when the detected level of the input signal is higher than the level of a difference voltage of the threshold voltage of the input stage transistor from the power supply voltage.

REFERENCES:
patent: 5077491 (1991-12-01), Heck et al.
patent: 5159211 (1992-10-01), Fujii
patent: 5557221 (1996-09-01), Taguchi et al.
patent: 5642063 (1997-06-01), Lehikoinen
patent: 5726592 (1998-03-01), Schulte et al.
patent: 5834974 (1998-11-01), Kim
patent: 5859526 (1999-01-01), Do et al.

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