Boots – shoes – and leggings
Patent
1995-06-07
2000-06-13
Mai, Tan V.
Boots, shoes, and leggings
327356, G06G 716
Patent
active
060740825
ABSTRACT:
An analog multiplier includes a new circuit topology, which includes coupling an amplifier between the collector of one of the input transistors and the bases of the other two input transistors. The amplifier used in the new topology is a double emitter-follower. The collector currents in the other two input transistors are "forced" using the conventional topology but by a simple two transistor forcing circuit comprising a Darlington emitter-follower pair rather than the conventional operational amplifier. The simple forcing circuits allow the multiplier to be used in very low voltage applications having only a single supply voltage. Voltage to current converters can be used on the front end to convert voltage input signals to current input signals, which are then provided to the analog multiplier. The voltage to current converter uses a pre-biasing scheme to produce a linear relationship between the input voltages and the input currents across the entire voltage range of the input voltages. At the back end of the multiplier, current to voltage converters can be added to convert the current output of the multiplier to a corresponding voltage output.
REFERENCES:
"Analog IC design: the current-mode approach," by Barrie Gilbert, Chapter 2, pp. 11-39 and 52-91, 1990.
"Analog IC design: the current-mode approach," by Barrie Gilbert, Chapter 6, pp. 239-296, 1990.
Analog Devices Inc.
Mai Tan V.
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