Boots – shoes – and leggings
Patent
1980-08-11
1982-10-12
Gruber, Felix D.
Boots, shoes, and leggings
364861, G06G 748
Patent
active
043542506
ABSTRACT:
An integrated circuit comprising first and second nodes that are connected to external circuitry, a voltage follower having input and output terminals electrically connected between the second node and the bottom plate of a first integrated capacitor C1, and second and third integrated capacitors C2 and C3 having the bottom plates thereof connected to a ground reference potential. A switch means is operative for periodically electrically connecting the top plate of C1 to the first and second nodes during first and second non-overlapping time periods in each time interval T for discharging C1 and charging C1 to the difference voltage across the nodes, respectively, where T is the time interval between adjacent second time periods and f=1/T is the switching frequency for C1. The switch means also operates for periodically electrically connecting the top plates of C2 and C3 to the second and first nodes. The circuit simulates a source resistor when the first node is electrically connected to the output terminal of a voltage source that is connected to ground. This circuit configuration simulates a bilinear source resistor when the capacitances of C1, C2 and C3 are the same values, and the circuit is characterized by the bilinear transformation.
REFERENCES:
patent: 4244030 (1981-01-01), Albarello
Bocic: Sampled-Data Filters with Switched Capacitors, Int. Journal Electronics, 1979, vol. 47, No. 6, pp. 537-543.
Temes et al., Switched-Capacitor Filter Design Using the Bilinear z-Transform, IEEE Transactions on Circuits and Systems, vol. CAS 25, No. 12, Dec. 1978, pp. 1039-1044.
Fettweis: Principles of Switched-Capacitor Filters, Archiv fur Elektronik und Uebertragungstechnik, vol. 33, No. 1, 1979, pp. 13-19.
Man Shek Lee: Switched-Capacitor Filters using Floating-Inductance Simulation Circuits, Electronics Letters, Sep. 27, 1979, vol. 15, No. 20, pp. 644-645.
Man Shek Lee: Improved Circuit Elements For Switched-Capacitor Ladder Filters, Electronics Letters, Feb. 14, 1980, vol. 16, No. 4, pp. 131-133.
Cannon Russell A.
Gruber Felix D.
GTE Automatic Electric Laboratories Inc.
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