Adjustable attenuator circuit

Details Adjustable attenuator circuit Adjustable attenuator circuit

1981-08-12

1984-08-28

Shaw, Gareth D.

Boots, shoes, and leggings

364571, 307520, H03G 300

Patent

active

044687494

ABSTRACT:
An adjustable attenuator circuit in which sampled electric charges are partially transferred from a sampling capacitor to a charge dividing capacitor during a short time within each sampling period, and electric charges stored in the charge dividing capacitor are additively transferred to an integrating capacitor or are discharged to ground according to the content of a weighting coefficient which determines the attenuation factor of the adjustable attenuator circuit.

REFERENCES:
patent: 4354250 (1982-10-01), Lee
patent: 4393351 (1983-07-01), Gregorian
H. C. Pakangia et al., 2 Phase Circulating Shift Reg. for Switched-Capacitor N-Path Filters, May 27, 1982, p. 444.
IEEE International Solid-State Circuits Conference, "A Realtime Programmable Switched Capacitor Filter", by Cox et al., 1980, pp. 94-95 and 264.
Proc. ISCAS, "A CMOS Digitally Controlled Analog Attenuator for Voice-Band Signals," by Baldwin et al., 1977, pp. 519-524.
Electronics Letters, "Increasing the Clock Frequency of Switched-Capacitor Filters", by T. Viswanathan, vol. 16, No. 9, Apr. 1980, pp. 316-317.
ISCAS 1979, "Improved Circuits for the Realization of Switched Capacitor Filters", by Ken Martin, pp. 756-759.

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