Semiconductor integrated circuit with analogue signal processing

Details Semiconductor integrated circuit with analogue signal processing Semiconductor integrated circuit with analogue signal processing

1991-05-31

1992-09-08

Miller, Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307443, 357 237, 357 45, 364600, H03K 3013

Patent

active

051461129

ABSTRACT:
A semiconductor integrated circuit device having an analogue signal processing circuit and a digital signal processing circuit formed on a single semiconductor substrate is disclosed. As an example of the analogue signal processing circuit, a voltage comparator is described. Being liable to be affected by noise, an inverter 2 is formed of an NMOS transistor 41 and a resistance R. For transistor 41 is formed in a well region having a conductivity type (p) opposite to the conductivity type of the substrate (n), it is not easily influenced by noise transmitted through the substrate. Therefore, a voltage comparator independent of the adverse effect of noise from the digital signal processing circuit is obtained.

REFERENCES:
patent: 4508981 (1985-04-01), Donler et al.
patent: 4797583 (1989-01-01), Ueno et al.
patent: 4872010 (1989-10-01), Larson et al.
patent: 4968904 (1990-11-01), Yamashita et al.
K. Okada et al., "A Multiplying Encoder for Digital Signal Processing", Mitsubishi Electric Corporation, pp. 101-102.
Y. Okada et al., "A Mixed Analog/Digital Video Signal Processing LSI With On-Chip AD and DA Converters", IEEE 1989 Custom Integrated Circuits Conference, pp. 24.1.1-24.1.4.
N. Weste, Principles of CMOS VLSI Design A Systems Perspective, pp. 196-199, 201 and 299-230.

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