Heating resistor type air flow-meter of ratio-metric output type

Details Heating resistor type air flow-meter of ratio-metric output type Heating resistor type air flow-meter of ratio-metric output type

1997-11-19

2000-03-07

Patel, Harshad

Measuring and testing

Volume or rate of flow

Thermal type

731182, 7320415, G01F 168

Patent

active

060325267

ABSTRACT:
A heating resistor type air flow-meter has a ratio-meter circuit comprising a proportional circuit for outputting a signal V.sub.out proportional to an input voltage V.sub.in a multiplying circuit for outputting a multiplied signal V.sub.m proportional to a product of a voltage difference VD between an internal reference voltage VINT and an external reference voltage VREF and the voltage signal V.sub.in and an adding circuit for adding the output signal V.sub.p of the proportional circuit and the output signal V.sub.m of the multiplying circuit.

REFERENCES:
patent: 5201217 (1993-04-01), Wachi
patent: 5537871 (1996-07-01), Itsuji et al.

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