Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1992-06-26
1993-03-23
Sikes, William L.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307271, 307529, 307356, 3072963, 328 15, 328156, H03K 522, H03K 5153
Patent
active
051967421
ABSTRACT:
A circuit of use as a multiplier or a logic cell and suitable for low voltage operation. At least three differential transistor stages are used, with two of the stages receiving one input signal, such as a data input signal if the circuit is to function as a logic cell and a multiplicand if the circuit is to function as a multiplier. A load is provided for the two stages which is connected to one of the circuit supply voltages. The third differential transistor stage receives a second input signal which is the other multiplicand if the circuit is configured as a multiplier and which is a clock signal if the circuit is configured as a logic cell. Circuitry is provided for controlling current flow through the first and second stages in response to current flow in the third stage. If the circuit is configured as a multiplier, the change in current flow in the first and second stages caused the transconductance of the stages to change so that multiplying action will take place. If the circuit is configured as a logic cell, the change is current flow due to the transitions in the clock causes the first stage to be active so that the data input is first transferred to that stage. Further transitions in the clock then cause the first stage to be inactive and the second stage active so that the data is transferred from the first to the second stage and stored in the second stage. The circuit architecture permits low voltage operation such as needed in battery powered applications.
REFERENCES:
patent: 5138201 (1992-08-01), Ohbayashi et al.
Article entitled "A 1.8 GHz Low Power & Low Voltage Silicon Dual Modulus Prescaler" relating to the VLSI Circuit Symposium of 1987 Aichi Japan pp. 95-96.
Circuits showing transistor comparator-Classified in 307-354 admitted prior art as of Jun. 26, 1992.
Dennis L. Feucht, Handbook of Analog Circuit Design, pp. 27-32 (1990), Academic Press, San Diego.
National Semiconductor Corporation
Sikes William L.
Wambach Margaret Rose
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