High pass filter and method of making same

Details High pass filter and method of making same High pass filter and method of making same

1979-03-01

1983-09-20

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330109, H03F 134

Patent

active

044058993

ABSTRACT:
There is provided a high pass switched capacitor filter having low bandpass ripple. The present filter does not have peaking near its center frequency when sampled at switching frequencies used in communication systems. The high pass filter has three switched capacitor integrators providing a 3-pole Chebyshev high pass switched capacitor filter. A fourth switched capacitor integrator is used to provide an output for the filter. A method of implementing the high pass filter from a set of parameter requirements is also provided. The capacitors used in this filter are ratios of each other and the filter readily lends itself to being implemented as a monolithic integrated circuit, particularly as a CMOS circuit.

REFERENCES:
patent: 4210872 (1980-07-01), Gregorian
Jacobs, "Practical Design Considerations for MOS Switched Capacitor Ladder Filters," Electronics Research Laboratory, Un. of California, Berkeley, Nov. 11, 1977, p. 84-89.
Caves et al., "Sampled Analog Filtering Using Switched Capacitors as Resistor Equivalents,"IEEE Journal of Solid-State Circuits vol. SC-12, No. 6, Dec. 1977 pp. 592-599.
Gregorian, R., et al., "CMOS Switched-Capacitor Filter for a Two-Chip PCM Voice Coder," IEEE Int. Solid State Circuits Conference, Digest of Technical Papers, vol. XXII, 1979-02, Feb. 1979, pp. 28; 273-274.
Hosticka et al., "MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators," IEEE Journal of Solid-State Circuitsvol. SC-12, No. 6, Dec. 1977, pp. 600-608.

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