Process parameters and temperature insensitive analog divider/mu

Details Process parameters and temperature insensitive analog divider/mu Process parameters and temperature insensitive analog divider/mu

1997-05-01

1999-06-08

Wambach, Margaret R.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Combining of plural signals

327358, 327359, 327378, 327513, 327561, 327563, H03K 1792

Patent

active

059107456

ABSTRACT:
A CMOS analog divider/multiplier/ratiometry circuit that provides a ratiometric output of two or more inputs, where the output is insensitive to process parameters and temperature variations effecting the circuit. The analog divider/multiplier/ratiometry circuit includes a multiplier portion made up of six FET devices. The six FET devices are electrically connected together so that first and second current outputs from the multiplier portion are insensitive to process parameter and temperature variations effecting the circuit. A first input current is applied to a gate terminal of one of the FET devices and a second input current is applied to a gate terminal of the FET devices in the multiplier portion of the circuit. The first and second input currents are based on currents generated by first and second linear voltage-to-current converter input circuits that are responsive to first and second input voltage, respectively, whose ratio or product is to be determined at the output of the circuit. The output currents from the multiplier portion are applied to a difference amplifier that generates the ratio/product output.

REFERENCES:
patent: 4100432 (1978-07-01), Miyakawa et al.
Zarabadi, Seyed R. et al. "An Angular Rate Sensor Interface IC," IEEE 1996 Custom Integrated Circuits Conference, pp. 14.6.1-15.6.4.

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